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Steel 20kp

Designation

Name The value
Designation GOST Cyrillic 20кп
Designation GOST Latin 20kp
Transliteration 20kp
The chemical elements 20

Description

Steel 20kp used: for the manufacture of sheet metal, 1−2 mm 4−14 category, intended for cold forming without heat treatment or after normalization, nipples, fittings, plugs, bolts, flanges, housings vessels and devices operating under low pressure and at temperatures from -20 °C to +425 °C, after carburizing and cyanidation parts, which require high surface hardness and low strength of the core (axles, fasteners, fingers, stars); electric-welded pipes.

Note

The degree of deoxidation — KP.

Standards

Name Code Standards
Tapes В34 GOST 10234-77, GOST 19851-74
Sectional and shaped rolling В32 GOST 1050-88, GOST 7417-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, GOST 1050-2013, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
Sheets and stripes В33 GOST 1577-93, GOST 4041-71, TU 14-1-4516-88
Classification, nomenclature and general norms В70 GOST 2771-81
Pipes steel and connecting parts to them В62 GOST 3262-75, GOST 10704-91, GOST 10705-80, GOST 10707-80, TU 14-3-1428-86, TU 1373-022-05757850-08, TU 1373-013-02949352-2003
Low-carbon steel wire В71 GOST 3282-74, GOST 5663-79
Tapes В24 GOST 3560-73
Steel wire medium- and high-carbon В72 GOST 3920-70, GOST 7372-79, GOST 9389-75, GOST 9850-72, GOST 17305-91, GOST 26366-84
Sheets and stripes В23 GOST 82-70, GOST 14918-80, GOST 16523-97, GOST 19904-90, GOST 103-2006, GOST 19903-90
Sectional and shaped rolling В22 GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 9234-74, GOST 10551-75, GOST 11474-76, GOST 19771-93, GOST 19772-93, GOST 2590-2006, GOST 2879-2006
Bulls. Blanks. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % d4 d d10 y, % kJ/m2, кДж/м2 Brinell hardness number, MPa HRC HRB
Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
- - 490-830 - - - - - - - - -
- - 390-540 - - - - - - - - -
- - 540-690 - - - - - - - - -
- - 690-830 - - - - - - - - -
- - ≤540 - - ≥15 - - - - - -
- - ≤410 - - - - - - - - -
Rolled sheet 1-2 categories of heat-treated (annealing, normalization, high tempering or normalizing + tempering) in the delivery state according to GOST 4041-71
4-14 - 340-490 ≥28 - - ≥24 - - ≤127 - ≤71
Wire for cold heading as supplied by GOST 5663-79
- - 470-620 - - - - ≥55 - - - -
- - ≤640 - - - - ≥50 - - - -
Longitudinal electric-welded pipes (Dy=10-530 mm) in the delivery condition. Listed marsvolta base metal
- ≥225 ≥372 ≥22 - - - - - - - -
Hot-rolled steel and hot rolled with special surface finish
- - - - - - - - - ≤156 - -
- - - - - - - - - ≤132 - -
Steel calibrated and calibrated with special surface finish
- - ≥490 ≥7 - - - ≥45 - ≤197 - -
- - 390-490 - - - - ≥50 - ≤163 - -
- - 340-440 - - - - ≥50 - ≤163 - -
Leaves heat-treated 1 and 2nd categories
- - 345-490 ≥28 - - - - - ≤157 - -
Hot-rolled sheet in the delivery condition. Group strength К330В
≤2 - 330-460 - ≥23 - - - - - - ≤73
2-3.9 - 330-460 - ≥24 - - - - - - ≤73
Cold-rolled sheet in the delivery condition. Group strength К330В
≤2 - 330-460 - ≥24 - - - - - - ≤73
2-3.9 - 330-460 - ≥25 - - - - - - ≤73
Strip. After normalizing or hot rolled
- - ≥380 ≥27 - - - ≥55 - - - -
Cementation at 920-950 °C + quenching in water from 800-820 °C + vacation at 180-200 °C, air cooling
50 ≥295 ≥490 ≥16 - - - ≥40 ≥481 ≥156 55-63 -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
d4 Elongation after rupture
d Elongation after rupture
d10 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness
HRC Rockwell hardness (indenter diamond spheroconical)
HRB Rockwell hardness (indenter steel, spherical)

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
0 212 - - - - -
20 212 - - - - -
100 208 7834 51 219 123 486
300 197 7770 44 381 138 514
500 177 7599 39 601 148 555
600 163 7659 36 758 151 584
900 - 7600 26 1135 152 703

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity
a The coefficient of linear expansion
С Specific heat

Technological properties

Name The value
Weldability Welded without restriction (except XTO). Welding methods: SMAW, ADS submerged arc and gas protection, the CCC.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1280 °C, the end - 750 °C. air Cooling.
Flock-sensitive sensitivity not sensitive.
Workability by cutting In the hot rolled condition with HB of 130 Kn TV.SPL.=1,7 Kn b.St.=1,6.

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