GOST 1789-70

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  ГОСТ 1789-70

GOST 1789−70 Strips and strips of beryllium bronze. Technical specifications (with Changes 1−5 N)

GOST 1789−70

Group В53

STATE STANDARD OF THE USSR

STRIPS AND STRIPS OF BERYLLIUM BRONZE

Specifications

Beryllium bronze strips and ribbons.
Specifications

GST 18 4620, 4630 18

Valid from 01.07.70
before 01.01.94*
_______________________________
* Expiration removed
Protocol N 3−93 Interstate Council
for standardization, Metrology and certification
(IUS N 5−6, 1993). — Note the CODE.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of nonferrous metallurgy of the USSR

DEVELOPERS

A. I. Alexandrin, S. S. Krasheninnikov (supervisor)

2. APPROVED AND promulgated by the Committee of standards, measures and measuring devices under Council of Ministers of the USSR from 07.01.70 N 13

3. REPLACE GOST 1789−60

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The number of the paragraph, subparagraph, enumeration, applications
GOST 166−89	3.3
GOST 427−75	3.3 a, 3.3
GOST 1497−84	3.5
GOST 2228−81	4.1, 4.4
GOST 2991−85	4.1
GOST 2999−75	3.7
GOST 3282−74	4.1, 4.4
GOST 3560−73	4.1, 4.4
GOST 4381−87	3.3
GOST 4430−78	4.1
GOST 6507−90	3.3
GOST 7164−78	Annex 1a
GOST 7502−89	3.3
GOST 8828−89	4.1, 4.4
GOST 9450−76	3.7
GOST 9557−87	4.1
GOST 9569−79	4.1. 4.4
GOST 10510−80	3.8
GOST 11701−84	3.5
GOST 14019−80	3.9
GOST 14192−77	4.6
GOST 15027.1−77 — GOST 15027.3−77	3.1
GOST 15027.5−77 — GOST 15027.7−77	3.1
GOST 15027.13−77	3.1
GOST 15027.14−77	3.1
GOST 15102−75	4.4
GOST 17065−77	4.1
GOST 17308−88	4.4
GOST 18175−78	2.1
GOST 18242−72	3A.3A
GOST 18321−73	3A.3A, 3.3 and
GOST 18579−79	4.4
GOST 20068.1−79 — GOST 20068.2−79	3.1
GOST 21073.0−75	3.9
GOST 21073.1−75	3.9
GOST 22225−76	4.4
GOST 24047−80	3.5
GOST 24231−80	3.1
GOST 24597−81	4.1
GOST 26653−85	4.7
GOST 26877−91	3.4

5. Validity extended until 01.01.94 by the Resolution of Gosstandart of the USSR from 07.04.88 N 1007

6. REISSUE with Changes of N 1, 2, 3, 4, 5, approved in February 1979, March 1983, Post. N 1078 from 03.03.83, August 1984, August 1986, April 1988 (IUS 4−79, 6−83, 12−84, 11−86, 7−88)

This standard applies to cold rolled strips and strips of beryllium bronze, used in instrument engineering for production of various components, including springs and other sensitive elements.

(Changed edition, Rev. N 5).

1. ASSORTMENT

1.1. The thickness of the strip and limit deviations for thickness shall conform to the requirements specified in table.1.

Table 1

mm

Maximum deviations in thickness
Thickness	bands			tapes
normal accuracy	increased accuracy	high precision	normal accuracy	increased accuracy	high precision
0,02	-	-	-	-	-0,01	-
0,03
0,04
0,05
0,06
0,07
0,08
0,09
0,10	-0,02	-0,015
0,11
0,12
0,13
0,14
0,15	-0,03	-0,02	-	-0,03	-0,02
0,16
0,18
0,20
0,22
0,23
0,25	-0,04
0,28
0,30
0,32	-0,03	-0,04	-0,03
0,35
0,40	-0,05	-0,04
0,45
0,50	-0,05	-0,04	-0,03
0,55	-0,06	-
0,60	-0,06	-0,05
0,65
0,70	-0,07	-0,04
0,75
0,80
0,85
0,90	-0,08
Of 1.00	-0,07
1,10	-0,09	-
1,20
1,30	-0,10	-0,06
1,40	-0,09
1,50	-0,08	-0,07
1,60	-0,09	-0,07	-	-	-
1,70
1,80
1,90
Of 2.00	-0,08
2,20	-0,12	-0,11
2,50
2,80
Of 3.00	-0,10
3,20	-0,13	-0,12
3,50
Of 4.00	-0,18	-0,16	-0,14
4,50	-0,20	-0,19	-0,18
5,00
5,50	-0,24	-0,22
6,00	-0,25	-0,24

Notes:

1. Requirements for the manufacture of ribbons and strips, high precision in thickness are 01.01.90.

2. The theoretical weight given in Annex 1.


(Changed edition, Rev. N 5).

1.2. The width of the strips and limit deviations on width depending on the thickness should meet the requirements specified in table.2.

Table 2

mm

Maximum deviations in width for strips with thickness of
Width	to 1.5		St 1.5 to 3.0
normal accuracy	increased accuracy	normal accuracy	increased accuracy	St. is 3.0 to 5.0	St. 5.0 to 6.0
40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100	A 1.0	-0,30	To 2.0	-0,50	-	-
110, 120, 130, 140, 150, 160, 170	To 2.0	-5,0
180, 190, 200, 250, 270, 280, 290, 300	To 2.0	-0,60	Is 3.0	-0,80	Is 3.0	-6,0

Note. Requirements for the production of strips of high accuracy in width are 01.01.90.


(Changed edition, Rev. N 5).

1.3. The length of the strips and limit deviations depending on the condition of the material and thickness shall conform to the requirements specified in table.3.

Table 3

mm

The condition of the material	The thickness of the strip	The length of the strip	Limit deviations for the length of the strip
Soft (tempered)	0,15−6,0	200−500	+5
Solid (deformed after hardening by 30−40%)	0,15−1,50	200−600	+5
1,60−6,0	500−1500	+10

(Changed edition, Rev. N 1).

1.4. Strips produce dimensional dimensional and random length.

(Changed edition, Rev. N 1, 2).

1.5. The width of the strips and limit deviations on width depending on the thickness should meet the requirements specified in table.4.

Table 4

mm

Maximum deviations in width when the thickness of the tape
Width	and 1.0 incl.	1,1−1,5	up to 1.5 incl.
normal accuracy		increased accuracy
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100	-0,5	-0,8	-0,3
110, 120, 130, 140, 150, 160, 170	-0,4
180, 190, 200, 250, 260, 270, 280, 300	-0,8	A 1.0	-0,6

Notes:

1. Tape thickness: up to 0.45 mm inclusive manufactured in widths from 10 to 280 mm, thickness 0,50 mm — width from 20 to 300 mm.

2. Requirements for the manufacture of strips of high accuracy in width are 01.01.90.


(Changed edition, Rev. N 1, 2, 5).

1.6. Tape is manufactured with a length of not less than 5 m. it is allowed to produce strips less than 5 m but not less than 1 m, not more than 10% of the batch weight.

The legend of strips and bands are filled according to the scheme:

when the following abbreviations:

method of manufacture:

cold rolled steel D

cross-section shape:

rectangular — PR

precision manufacturing:

Normal accuracy in thickness:

normal accuracy in width — N

increased accuracy in width To

Increased accuracy on thickness:

normal accuracy in width And

increased accuracy in width — P

High precision in thickness:

normal accuracy in width And

increased accuracy in width — In

status:

soft (tempered) — M

solid (deformed after hardening by 30−40%) — T

length:

dimensional — MD

dimensional — CD

random — ND.

Instead of the absent indicator is an X (except for notation).

Examples of symbols:

The cold-rolled strip of rectangular cross section, normal accuracy in thickness, high accuracy by width, soft (tempered), thickness 0.30 mm, width 80 mm, multiple lengths from beryllium bronze brand Brb2:

Strip DPRAM 0,30х80 CD Brb2 GOST 1789−70

Cold-rolled steel strip of rectangular cross section, high precision thickness, high accuracy by width, solid (deformed after hardening by 30−40%), thickness 0.55 mm, width 150 mm, random length from beryllium bronze Brbnt1,9:

Tape DPVT 0,55х150 ND Brbnt1,9 GOST 1789−70.

(Changed edition, Rev. N 5).

1.7. (Deleted, Rev. N 2).

2. TECHNICAL REQUIREMENTS

2.1. Strips and strips of beryllium bronze manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.1. The chemical composition of the strip from beryllium bronze Brb2 brands, Brbn 1,9 shall conform to the requirements of GOST 18175−78.

(Changed edition, Rev. N 5).

2.2. Strips and ribbons are made:

soft (tempered) Th — bronze Brb2 brands and Pbnt 1,9;

solid (deformed after hardening by 30−40%) — T — bronze Brb2 brands, Brbn of 1.9.

(Changed edition, Rev. N 2, 5).

2.3. The surface of the strip must be smooth, clean, free from contamination, hinder inspection must not be captured, cracks, bubbles, cavities, dents, and corrosion spots.

Allowed minor defects (slivers, cracks, bubbles, shells, dents, and corrosion spots), not outputs and strips, after Stripping the control over the tolerances for the thickness and color of a tint, redness and local darkening. Allowed the surface quality of the strip to check on the standards agreed upon between manufacturer and user.

(Changed edition, Rev. N 2, 5).

2.4. The edge of the strip should be trimmed evenly and should not have cracks and delamination. Wavy, wrinkled and torn edge are not allowed.

2.5. Camber strips shall not exceed 4 mm per 1 m length tape — 3 mm per 1 m length.

The camber of the strip with the width of 220 mm and high precision manufacturing shall not exceed respectively 3 mm and 2 mm on 1 m length with 01.01.90.

(Changed edition, Rev. N 1, 2, 5).

2.6. The mechanical properties of the strip shall conform to the requirements specified in table.5.

Table 5

Grade of bronze	The condition of the material	Thickness of strip, mm	Rupture strength, MPa (kgf/mm)	Elongation , %, not less	The Vickers hardness HV
BR B2	Soft (after quenching)	Less 0,02−0,14	-	-	No more 130
From 0.15 to 0.25	390−590 (40−60)	20
More than 0.25	Thirty
Br BOT 1,9	Soft (after quenching)	Less 0,02−0,14	-	-	No more 120
From 0.15 to 0.25	390−590 (40−60)	20
More than 0.25	30
Br 52	The solid (strain after hardening by 30−40%)	Less than 0,02−0,14	-	-	At least 170
From 0.15 to 0.25	590−880 (60−90)	-
More than 0.25	640−930 (65−96)	2,5
Br BOT 1,9	Less than 0,02−0,14	-	-	At least 160
From 0.15 to 0.25	590−880 (60−90)	-
More than 0.25	640−930 (65−95)	2,5

Note: the hardness of the strip thickness from 0.10 to 0.25 mm inclusive check on the device PMT-3 at a load of 0.2 kgf with a thickness of 0,05−0,09 mm under a load of 0.1 kgf, a thickness less than 0.05 mm under load of 0.02 kgf. The hardness must correspond to the values measured with a diamond pyramid (Vickers).

(Changed edition, Rev. N 2, 5).

2.7. Height at Eriksen (when punch radius 10 mm) for strip thickness of 0.10−0.25 mm is specified in table.6.

Table 6

Grade of bronze	The condition of the material	Height, mm, not less
BR B2 BR BOT 1,9	Soft (tempered)	8
BR B2 BR BOT 1,9	Solid (deformed after hardening by 30−40%)	3

2.8. Strips and strips of beryllium bronze must possess the ability to dispersion hardening. The mechanical properties of the strip after aging (dispersion hardening) shall comply with the requirements specified in table.7.

Table 7

Grade of bronze	The condition of the material	The width of the stripes and tapes mm	Rupture strength, MPa (kgf/mm)	Regarding elongation- use , %, less	Hardness measurement Renna diamond peers- DOI Vickers, not less than	Permissible (maximum) load when the hardness, kgf
The width of the stripes or ribbons, mm
0,25- Mobility in soil -0,35	0,40- -0,55	0.60 or more
Br B2	After aging (after quenching)	Less 0,02−0,14	-	-	330	5	-	-
0,15−0,25	1080−1470 (110−150)	-
More than 0.25	1130−1470 (115−150)	2,0
Br BOT 1,9	Less 0,02−0,14	-	-	330	-	10	-
0,15−0,25	1080−1470 (110−150)	-
More than 0.25	1130−1470 (115−150)	2,0
Br B2	After aging (after deformation by 30−40%)	Less 0,02−0,14	-	-	360	-	-	30
0,15−0,25	1130−1570 (115−160)	-
More than 0.25	1170−1570 (120−160)	1,5
Br BOT 1,9	Less 0,02−0,14	-	-	360	-	-	30
0,15−0,25	1130−1570 (115−160)	-
More than 0.25	1170−1570 (120−160)	1,5

Notes:

1. The hardness of the strip thickness from 0.10 to 0.25 mm inclusive is checked on the device TSMT-3 at a load of 0.2 kgf with a thickness of 0.09 mm or less — at a load of 0.1 or 0.05 kgf.

The hardness must correspond to the values measured with a diamond pyramid (Vickers).

2. The hardness of the strip thickness from 0.10 to 0.25 mm inclusive check on the device PMT-3 at a load of 0.2 kgf with a thickness of 0.05−0.09 mm under a load of 0.1 kgf, a thickness less than 0.05 mm under load of 0.02 kgf. The hardness must correspond to the values measured with a diamond pyramid (Vickers).

2.7−2.8. (Changed edition, Rev. N 5).

2.8. At the request of the consumer and strips of beryllium bronze Brb2 brands and Brbnt1,9 are manufactured from 01.01.90 with mechanical properties in accordance with the requirements given in table.7a.

Table 7a

The condition of the material	Thickness of strip, mm	Rupture strength , MPa (kgs/mm)	Elongation , %, not less
Soft	_0,15−0,25_ More than 0.25	390−540 (40−55)	_20_ 35
After the dispersion hardening of the soft state	0,15−0,25	1080−1370 (110−140)	-
More than 0.25	1130−1370 (115−140)	2
Solid	_0,15−0,25_ More than 0.25	640−880 (65−90)	_-_ 2,5
After the dispersion hardening from the solid state	0,15−0,25	1130−1520 (115−155)	-
More than 0.25	1180−1520 (120−155)	1,5

(Added, Rev. N 5).

2.9. Solid and strip of a thickness up to 1.5 mm, inclusive, shall withstand without cracking, the bend test cold through 90° around mandrel of diameter equal to two thicknesses of the strip (tape).

2.10. The microstructure of the strip after the dispersion hardening should have a uniform distribution of the inclusions phase.

The microstructure shall conform to the standards agreed upon by manufacturer and consumer.

The average grain size of the strip after the dispersion hardening of the soft state should not exceed 50 microns.

At the request of the consumer, the average grain size of the strip thickness of 0.5 mm and less shall not exceed 35 µm.

(Changed edition, Rev. N 5).

2.11. And strips in the fracture should be clean, dense, should not have delamination, cavities and foreign objects. Allowed in the fracture of each sample with a width of 120 mm, the total delamination length is not more than 2 mm.

(Changed edition, Rev. N 2).

2.12. (Deleted, Rev. N 5).

3A. ACCEPTANCE RULES

3A.1. Strips and ribbons are accepted by the parties. The party should consist of a strip of the same brand of alloy, one size, one material condition shall be furnished in one document about quality that contains:

trademark or a trademark and the name of the manufacturer;

the symbol of the strip;

the results of mechanical testing (at the customer’s request);

the number and the weight of the batch;

the date of manufacture.

The weight of the batch shall not exceed 500 kg.

By agreement between the consumer and the manufacturer, the party should consist of beryllium bronze one the heat.

3A.2. To determine the chemical composition, tests on the hood of the spherical hole and the bend is taken from the party on two lanes or two rolls of tapes. Allowed the manufacturer to carry out the sampling from the molten metal.

3A.3. Control the appearance, width and length are subjected to each roll and each band party.

(Changed edition, Rev. N 5).

3A.3.1. To control the thickness of the strip from the party selected strips or rolls «blindly» (by the greatest objectivity) according to GOST 18321−73.

The control plans comply with GOST 18242−72.

The number of selected bands or coils is determined by the table.7b.

Table 7b

The number of coils (strips) in the party.	The number of controlled coils (strips).
2−8	2
9−15	3
16−25	5
Correspond 26−50	8
51−90	13
91−150	20
151−280	32
281−500	50

The number of controlled points on each selected coil is determined depending on the length of the tape in the coil in accordance with the table.7b.

Table 7b

Tape length in roll, m		The number of controlled points per roll.	Rejection number
From	1 to 4 incl.	2	1
SV.	4 «7 «	3	1
»	7 «12 «	5	1
»	12 «75 «	8	2
»	75 «140 «	13	2
»	140 «250 «	20	3

The number of controlled points on each selected lane is determined depending on the total number of parcels with a length of 100 mm along the perimeter strip in accordance with the table.7G.

Table 7G

The number of parcels on the strip	The number of controlled outlets on the strip.	Rejection number
2−8	3	1
9−15	5	1

If the perimeter is not a multiple of 100 mm, the end section of a length less than 100 mm is taken for one site.

The selected tape is considered valid if the number of measurements that do not meet the requirements of table.1, less than the acceptance number given in table.7b and 7D.

3A.3.2. Allowed the manufacturer if unsatisfactory result on one of the selected coils or strips to control each coil or each strip party.

Allowed from the manufacturer in the production process to control the thickness of each coil or of each strip.

3A.3.3. Customer’s request thickness control is carried out on each roll and each band party.

3A.3.1−3A.3.3. (Added, Rev. N 5).

3A.4. To control the hardness, microstructure, grain size, quality of the fracture and for tensile tests from the party select three stripes or three rolls of tape.

The bend test, control of the microstructure and the grain size is carried out periodically at the request of the consumer.

3A.5. If unsatisfactory test results of at least one of the indicators of temporary resistance, relative elongation, hardness, average grain size, quality of the fracture, the depth of extrusion on it, repeat tests are carried out at twice the sample. The results of repeated tests apply to the entire party.

(Changed edition, Rev. N 5).

3. TEST METHODS

3.1. To determine the chemical composition of each selected strip or roll is cut on one sample according to GOST 24231−80.

Determination of the chemical composition of the strip is carried out according to GOST 15027.1−77 — GOST 15027.3−77, GOST 15027.5−77 — GOST 15027.7−77, GOST 15027.13−77, GOST 15027.14−77, GOST 20068.1−79, GOST 20068.2−79.

3.2. Inspection of the strip is carried out without the use of a magnifying device.

3.3. The thickness of the strips of 0.14 mm inclusive of high accuracy measured with a micrometer type Mr GOST 4381−87, the thickness of the strip other sizes and precision micrometer-type ML according to GOST 6507−90 at a minimum distance of 50 mm from the end and not less than 10 mm from the edge. Tape width of 20 mm or less, measured in the middle.

Allowed from the manufacturer in the production process to control the thickness of the strip other means of measurement, to ensure the necessary accuracy.

Thickness control of strip is carried out with a given probability of 96%.

The thickness of the strip measured at each of the selected coils and the strip at points located uniformly randomly along the length of the strip and the perimeter band.

Measurement of the width of the strip is carried out with a ruler according to GOST 427−75 or caliper according to GOST 166−89.

Measuring the length of the strip is carried out with a metal ruler according to GOST 427−75 or measuring tape according to GOST 7502−89.

(Changed edition, Rev. N 5).

3.3. The thickness of the tape or strip is measured for each of the selected strips or rolls of strips at points located uniformly randomly along the length of the roll or the perimeter strip using the method of «blind» (maximum objectivity) according to GOST 18321−73.

The tape length () in meters is calculated by the formula

,

where and  — the outer and inner diameters of the coil, measured with a ruler according to GOST 427−75, mm.'

 — tape thickness, mm.

The number of bands in the party (), EA, is calculated by the formula

,

where the weight of the batch, kg;

 — strip thickness, mm;

 — band width, mm;

the length of the strip, mm;

 — material density, g/cm.

Number of controlled sections in the band (), EA, is calculated by the formula

.

The results of measuring the thickness of the tape or band, not the corresponding table.1, should not differ from the permissible by more than half of the tolerance field.

If there is disagreement in the determination of the thickness of the strip control is carried out by the statistical technique.

(Added, Rev. N 5).

3.4. The camber of the strip measured in the same place at the end of the strip churchyard 26877−91.

3.5. For the tensile test from each selected strip, cut one sample in the direction of rolling.

Selection of samples for tensile tests carried out according to GOST 24047−80.

Tensile testing of tapes and bands is carried out according to GOST 11701−84 on a proportional flat samples of type I or type II: for ribbons and strips of a thickness of 0.15−1.7 mm, with a =12.5 mm and =50 mm for strips and strips of a thickness more than 1.7 to 3.0 mm inclusive =20 mm =80 mm.

Tensile test on strips with a thickness of 3−6 mm is carried out according to GOST 1497−84 on a proportional flat specimens with heads of type I with a =20 mm =11,3 mm

.

3.4, 3.5. (Changed edition, Rev. N 5).

3.6. To check the microstructure and the grain size, hardness and testing on the hood spherical dimples each of the selected roll or strip of cut out one sample.

3.7. Test the hardness of the strip thickness to 0.25 mm inclusive conduct churchyard 9450−76, of a thickness exceeding 0.25 mm according to GOST 2999−75.

3.8. Test the depth of the extrusion by Eriksen carried out according to GOST 10510−80. Allowed test on the hood of the spherical holes to hold the instrument in manual mode.

Allowed the manufacturer to test the depth of extrusion on Eriksen for tapes and strips of a width of less than 90 mm on the samples before cutting the roll, or strip of specified width.

(Changed edition, Rev. N 5).

3.9. For bend test from each selected roll, or strips cut one sample in the direction of rolling.

The bend test is carried out according to GOST 14019−80.

3.10. Determination of grain size and strips is carried out according to GOST 21073.0−75, GOST 21073.1−75.

3.11. To check the quality of a break from each selected roll or strip of cut out one sample width of 120 mm For strips and strips of a width of less than 120 mm specimen width shall be equal to the width of the tape or strip. The presence of the delamination test according to the method required applications 1A. Quality control of the fracture is carried out on the strips and tapes with a thickness of 1 mm or more.

(Changed edition, Rev. N 5).

4. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

4.1. Tape must be rolled into rolls. Internal diameter of coil shall be not less than 150 mm.

Rolls of tie wire according to GOST 3282−74 with a tape according to GOST 3560−73, GOST twine 16266−70 or synthetic twine or other synthetic binding material according to normative-technical documentation approved in the established order.

Coils and strips wrapped with paper GOST 8828−89, GOST 9569−79 or GOST 2228−81 and placed in a way excluding their travel (the gap between the coils is filled with wood shavings, foam, or other cushioning material) in a tight wooden boxes of type III according to GOST 2991−85 or drums according to GOST 17065−77. Packaging tape in reusable packaging according to GOST 4430−78.

It is allowed to link bands and bundles of wire according to GOST 3282−74 or tape according to GOST 3560−73 with the gasket between the strips of paper GOST 8828−89, GOST 9569−79 or GOST 2228−81.

The mass of the packing units should not exceed 80 kg.

Consolidation packages in overpacks carried out in accordance with GOST 24597−81. Packaging is carried out on pallets according to GOST 9557−87 or without pallets with the use of bars with a size of 50x50 mm and a length corresponding to the width of the drawer rail in the longitudinal and transverse directions with wire of diameter not less than 2 mm the churchyard 3282−74 or tape of size not less than 0,5 x 20 mm according to GOST 3560−73. Bond tips: twisting wire — not less than 5 turns, the tape is in the castle. In mechanized loading and unloading weight of the package must not exceed 500 kg.

(Changed edition, Rev. N 2, 5).

4.2. At the end of each coil or strip should be applied to the stamp of technical control.

4.3. Each roll of tape to each bundle of strips should be attached a label showing:

a) name or trademark of the manufacturer;

b) brand of bronze;

C) the size of the strips or bands;

g) precision manufacturing;

d) the condition of the material;

e) the batch number;

W) the number of this standard;

h) the stamp of technical control.

(Changed edition, Rev. N 2, 3).

4.4. It is allowed to transport the bundles of strips in light-duty and medium-duty containers according to GOST 22225−76, 15102−75 GOST, GOST 18579−79 without packing in boxes, and rolls of ribbons with thickness of 0.25 mm or more, wrapped in paper GOST 8828−89, 9569−79 GOST, GOST 2228−81 or wrapped in synthetic or non-woven materials and tied with a wire according to GOST 3282−74, twine GOST 17308−88 or synthetic twine.

During transportation in containers and strips must be reinforced with struts, precluding their displacement within the container. It is allowed to transport in containers and strips, Packed in boxes.

(Changed edition, Rev. N 2, 5).

4.5. In each box or container must be attached to packing list stating:

a) name or trademark of the manufacturer;

b) brand of bronze;

in) size strips or tapes;

g) precision manufacturing;

d) the condition of the material;

e) the masses of the party;

g) the batch number;

z) the number of this standard;

I) gross weight, net weight.

These data shall be marked on each drawer.

(Changed edition, Rev. N 2).

4.6. Transport marking of packages — according to GOST 14192−77 with application of additional labels the lot numbers and manipulation of the sign «Afraid of moisture!».

(Changed edition, Rev. N 2).

4.7. Strip and ribbon transporterowych all types of transport in covered vehicles in accordance with the rules of transportation of cargoes effective for this transport.

And strips during sea transport transporterowych in accordance with GOST 26653−85.

(Changed edition, Rev. N 2, 5)

4.8. When storing and strips must be protected from moisture, dust and exposure to active chemical agents.

(Added, Rev. N 2).

ANNEX 1A (binding). METHODS OF QUALITY CONTROL OF THE FRACTURE OF BERYLLIUM BRONZE FOR THE PRESENCE OF DELAMINATION

ANNEX 1A
Mandatory

This method is designed to check for delamination in the fracture of beryllium bronze and measuring the total length of these bundles.

1. EQUIPMENT

Muffle furnace, type MP-2U or other furnace according to normative-technical documentation approved in the established order.

Device for automatic control and registration of temperature of the furnace type EDR-120 GOST 7164−78.

A device for loading samples into the furnace.

Device for the fracture of the samples.

Binocular microscope type MBS-2 or MBS-1 with the eyepiece 8and 8 eyepiecewith diopter sights and a scale (to measure the length of the bundles).

2. PROTOTYPING

To check the quality of the fracture of each roll and each selected strip is cut sample with a length of 50−80 mm in the direction of hire.

3. HEAT TREATMENT OF SAMPLES

Samples of beryllium bronze are subjected to heat treatment in a muffle furnace. The treatment must meet the specified in the table.

The condition of the material	Temperature aging (dispersion hardening), °C	The time of exposure, h
Soft (tempered)	3 and warm-up time of the charge
Solid (deformed after hardening by 30−40%)	310±5	2.5 warm-up time of the charge

After aging the samples at this temperature to unload them from the furnace and cooling in air.

4. QUALITY CONTROL FRACTURE

The samples after aging (dispersion hardening), and cooling is subjected to fracture across rolling.

Compliance specified in the mode table aging must ensure that brittle fracture of the samples.

A preliminary inspection of the fracture samples is carried out visually.

Measurement of the total bundles in the fracture is performed under binocular microscope type MBS-2 or MBS-1.

The study of fracture surface it is recommended to direct light at an inclined position of the sample. To get the most clear images of individual sections of the fracture it is necessary to change the angle of the fracture surface.

To get the size of the bundle in the eyepiece of the microscope attachment set two eyepiece: the eyepiece 8and the eyepiece 8with the diopter sights and the scale. The price of one division of the eyepiece scale when increasing the scale of the drum of a microscope, equal to 0.6 corresponds to about 0.17.

The number of divisions of the eyepiece scale corresponding to each bundle in the fracture of one sample are added up and multiplied by the division value (0,17). The result is the total length of delamination (mm) in the fracture of one sample. If the total length of bundles exceeds the allowable value, the repeated control of the fracture at twice the number of samples.

The study of the structure of the fracture under a microscope is carried out without pre-treatment of the fracture (without the grinding, polishing and etching).

To obtain an even break before aging (dispersion hardening) of the sample is carried out pruning of 0.1 thickness across the cross-section in accordance with the drawing.

 — sample thickness;  — width of the sample;  — the sample length

(Changed edition, Rev. N 2).

APPENDIX 1. THEORETICAL WEIGHT of 1 square meter of the strip

ANNEX 1

THEORETICAL WEIGHT of 1 mof strip

The thickness of the strip in mm	Theoretical weight of 1 mkg
0,02	0,164
0,03	0,246
0,04	0,328
0,05	0,410
0,06	0,492
0,07	0,574
0,08	0,656
0,09	0,738
0,10	0,82
0,11	0,90
0,12	0,98
0,13	Of 1.07
0,14	1,15
0,15	Of 1.23
0,16	Of 1.31
0,18	1,48
0,20	1,64
0,22	1,80
0,25	Of 2.05
0,28	2,30
0,30	2,46
0,35	2,87
0,40	3,28
0,45	3,69
0,50	4,10
0,55	Of 4.51
0,60	4,92
0,65	Of 5.33
0,70	5,74
0,75	6,15
0,80	6,56
0,85	Of 6.97
0,90	Of 7.38
Of 1.00	8,20
1,10	Of 9.02
1,20	Of 9.84
1,30	10,66
1,40	Of 11.48
1,50	12,30
1,60	13,12
1,70	13,94
1,80	14,76
1,90	15,58
Of 2.00	16,40
2,20	18,04
2,50	20,50
2,80	22,96
Of 3.00	24,60
3,2	26,24
3,5	28,70
4,0	32,80
4,5	36,90
5,0	41,00
5,5	45,10
6,0	49,20

Note. Theoretical mass calculated for the nominal thickness of the strip and tape. The density of bronze is taken equal to 8.2 g/cm.


ANNEX 2 (Deleted, Rev. N 1).

APPENDIX 3 (reference). THE INFORMATIONAL TABLE OF YIELD STRENGTH AND ELASTIC MODULUS OF BERYLLIUM BRONZE

APPENDIX 3
Reference

Grade of bronze	The condition of the material	Yield strength tensile , MPa (kgf/mm)	The elastic modulus measured by the dynamic method, MPa (kgf/mm)
Br B2 Br BNT 1,9	Soft	196−344 (20−35)	93−113 (9500−11500)
Solid	588−930 (60−95)	108−118 (11000−12000)
After the dispersion hardening of the soft state	930−1320 (95−135)	103−122 (10500−12500)
After the dispersion hardening from the solid state	1120−1570 (115−160)	118−27* (12000−13000)

_________________
* Consistent with the original. — Note the CODE.


(Changed edition, Rev. N 5).