GOST 18907-73
GOST 18907−73 Bars cold-worked, heat-treated and polished made of high-alloy corrosion resistant steel. Specifications (with Amendments No. 1, 2, 3, 4)
GOST 18907−73
Group В32
INTERSTATE STANDARD
BARS COLD-WORKED, HEAT-TREATED AND POLISHED MADE OF HIGH-ALLOY CORROSION-RESISTANT BECAME
Specifications
Cold-worked and heat-treated ground pars of high-alloy and corrosion-resistant steel. Specifications
ISS 77.140.60
GST 11 5200
Date of introduction 1975−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR
2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from
3. REPLACE GOST 5548−50 (in terms of ground and polished bars)
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
Item number |
| GOST 1497−84 |
4.3 |
| GOST 1579−93 |
4.4 |
| GOST 5632−72 |
2.1 |
| GOST 5949−75 |
2.4 |
| GOST 6032−89 |
4.5 |
| GOST 7565−81 |
3.3 |
| GOST 9012−59 |
4.2 |
| GOST 10243−75 |
4.6 |
| GOST 10446−80 |
4.3 |
| GOST 12344−2003 |
4.1 |
| GOST 12345−2001 |
4.1 |
| GOST 12346−78 |
4.1 |
| GOST 12347−77 |
4.1 |
| GOST 12348−78 |
4.1 |
| GOST 12349−83 |
4.1 |
| GOST 12350−78 |
4.1 |
| GOST 12351−2003 |
4.1 |
| GOST 12352−81 |
4.1 |
| GOST 12353−78 |
4.1 |
| GOST 12354−81 |
4.1 |
| GOST 12355−78 |
4.1 |
| GOST 12356−81 |
4.1 |
| GOST 12357−84 |
4.1 |
| GOST 12358−2002 |
4.1 |
| GOST 12359−99 |
4.1 |
| GOST 12360−82 |
4.1 |
| GOST 12361−2002 |
4.1 |
| GOST 12362−79 |
4.1 |
| GOST 12363−79 |
4.1 |
| GOST 12364−84 |
4.1 |
| GOST 12365−84 |
4.1 |
| Round bar GOST 14955−77 |
3.1, 4.7, 5.1 |
| GOST 28473−90 |
4.1 |
5. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)
6. EDITION with Amendments No. 1, 2, 3, 4, approved in March 1976 December 1978 September 1985, February 1988 (IUS 4−76, 2−79, 12−85, 5−88)
This standard applies to round cold-worked and heat treated grinded rods of high-alloy and corrosion-resistant steel.
1. ASSORTMENT
1.1. The bars are made with a diameter of 1.0−30 mm qualitativ h9, h10 and h11, finish C, d and e, form, dimensions and limit deviations — according to GOST 14955.
Notes:
1. Rods qualitativ h7 and h8 and surface finishes Used are made by agreement between manufacturer and consumer.
2. By agreement with the consumer it is allowed manufacture of steel in coils.
(Changed edition, Rev. N 4).
Examples of symbols
Bars with a diameter of 15 mm, h11 tolerance, surface finishing of steel 12H13, heat-treated to a given strength:
Round 15-h11-G-12H13-TP GOST 18907−73
Bars with a diameter of 5 mm, quality h9, surface finish, of steel grade 08CR18NI10TI, cold-worked:
Round 5-h9-B-08X18H10T-H GOST 18907−73
Bars with a diameter of 8 mm, tolerance h11, group surface finishes G of steel grade 25KH13N2, annealed:
Torug 8-h11, G-25KH13N2-T GOST 18907−73
(Changed edition, Rev. N 4).
2. TECHNICAL REQUIREMENTS
2.1. The bars are made of steel 08KH13, 12H13, 20X13, 30X13, 40X13, 15KH28, 12H18N9, 17H18N9, 12X18H9T, 12X18H10T, 14KH17N2, 09KH16N4B, 40KH10S2M, 37KH12N8G8MFB, 08H18N10, 08CR18NI10TI, 25KH13N2 with the chemical composition according to GOST 5632.
2.2. In accordance with the order the bars are made:
cold-worked condition — N;
in heat-treated:
annealed — T;
on a given error — TP.
(Changed edition, Rev. N 1).
2.3. Temporary resistance () hardened rods (N) of steel grades 12H18N9, 17H18N9, 12CR18NI10TI 12X18H9T, 08KH18N10T and 08X18H10 must comply with:
not less than 930 N/mm(95 kgf/mm
) for bars sizes up to 5.0 mm;
not less than 880 N/mm(90 kgf/mm
) for bars with a size of 5.0 mm or more.
(Changed edition, Rev. N 1, 4).
2.4. Mechanical properties of bars supplied in the annealed condition (T), defined on the control and thermally treated samples or samples made from heat-treated blanks, must meet: of steel grade 37KH12N8G8MFB — requirements technical documentation approved in the established procedure, of steel other brands — the requirements of GOST 5949.
(Changed edition, Rev. N 1).
2.5. Mechanical properties of bars processed on a given strength (TA) shall meet the requirements specified in table.1.
Table 1
| Steel grade |
Tensile strength |
Elongation |
| 12H13 | 490−780 (50−80) | 16 |
| 20X13 | 510−780 (52−80) | 14 |
| 30X13 | 530−780 (54−80) | 12 |
| 40X13 | 590−810 (60−83) | 10 |
| 12KH18N9 | 640−880 (65−90) | 20 |
| 17H18N9 | 590−880 (60−90) | 20 |
| 08X18H10 | 640−780 (65−80) | 20 |
| 12X18H9T | 640−880 (65−90) | 20 |
| 12KH18N10T | 590−830 (60−85) | 20 |
| 08KH18N10T | 590−830 (60−85) | 20 |
| 25KH13N2 | 690−980 (70−100) | - |
2.6. The hardness of the annealed bars (T) of 5 mm diameter or more must comply with the requirements specified in table.2.
Table 2
| Steel grade |
Indentation diameter, mm |
Hardness, HB |
| 40KH10S2M | 3,70−4,30 | 197−269 |
| 25KH13N2 | 3,60−4,20 | 207−285 |
| 14KH17N2 | Not less than 3.50 | No more 302 |
| 09KH16N4B | Not less than 3,40 | No more than 321 |
| 37KH12N8G8MFB | Not less than 3,70 | No more than 269 |
| 08KH13 | 4,49−5,50 | 116−179 |
| 12H13 | 4,40−5,40 | 121−187 |
| 20X13 | 4,30−5,30 | 126−197 |
| 30X13 | 4,10−5,20 | 131−217 |
| 40X13 | 4,00−5,00 | 143−229 |
2.5, 2.6. (Changed edition, Rev. N 1, 4).
2.7. Cold-worked bars and rods of steel grades 12H18N9, 17H18N9, 12X18H9T and 12KH18N10T with a diameter less than 5 mm to withstand at least four kinks.
2.8. Steel brands 08H18N10, 08CR18NI10TI, 12KH18N9T, 12KH18N10T 17H18N9 and should not have the tendency to intergranular corrosion.
(Changed edition, Rev. N 4).
2.9. Macrostructure of steel shall be no traces of shrinkage, delamination, foreign inclusions, blowholes and cracks visible without using the magnifying devices.
2.10. At customer’s request bars are made:
a) with narrowed limits of mechanical properties of heat-treated rods of steel grades 12H13 and 20X13 listed in table.3;
b) higher than that specified in clause 2.3, regulations of temporary resistance hardened bars;
C) a tensile test on bars of hardened steel 08KH13, 12H13, 20X13, 30X13, 40X13, 15KH28, 14KH17N2, 09Х15Н4Б, 40KH10S2M, 37KH12N8G8MFB, 25KH13N2;
g) test for intergranular corrosion steel grades not covered in paragraph 2.8.
Table 3
| Mark steels | Tensile strength |
Elongation | |
| 4−8 | 8 |
||
| 12H13 | 568−764 (58−78) |
Not less than 568 (58) |
16 |
| 20X13 | 666−784 (68−80) |
No less than 666 (68) |
16 |
Note. For bars with a diameter of 10 mm or more is determined by the hardness and specified in the document of quality.
(Amended version, Edit. N 1, 2, 4).
3. ACCEPTANCE RULES
3.1. Acceptance criteria shall conform to the requirements of GOST 14955 and additional requirements specified below.
3.2. To check the quality of steel from the party taken:
a) hardness — 5%, but not less than five rods;
b) to determine the mechanical properties (tensile tests and bend) rod.
(Changed edition, Rev. N 3).
3.3. At the request of the consumer to check the chemical composition of the finished product. Sampling for chemical analysis is produced according to GOST 7565.
3.4. Macrostructure check plavochek the control of the manufacturer and the test results make a document about quality.
4. TEST METHODS
4.1. Chemical analysis were carried out according to GOST 12344, 12345 GOST — GOST 12365 and GOST 28473 or other methods providing the required accuracy.
(Changed edition, Rev. N 3).
4.2. Brinell hardness number is determined according to GOST 9012.
4.3. Tensile test bars with diameter less than 10 mm is carried out according to GOST 10446 on samples with an estimated length of 100 mm and bars with diameter 10 mm according to GOST 1497 on cylindrical samples five times the length.
From each selected control rods are selected one sample.
4.4. The test bend is carried out according to GOST 1579.
From each selected control rods are selected one sample.
4.3, 4.4. (Changed edition, Rev. N 3).
4.5. Tests for intergranular corrosion is carried out according to GOST 6032*.
_______________
* Standards 6032−2003. — Note the manufacturer’s database.
4.6. Validation of the macrostructure is carried out according to GOST 10243. Allowed verification of the macrostructure of a non-destructive method.
4.7. Check the shape, size, appearance, and surface roughness of rods produced according to GOST 14955.
5. PACKING, MARKING, TRANSPORTATION AND STORAGE
5.1. Packing, marking, transportation and storage — by GOST 14955.
(Changed edition, Rev. N 3).
5.2; 5.3. (Deleted, Rev. N 3).
