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Steel 70

70G steel Steel 60S2HFA Steel 60KhFA (60KhF) Steel 65 Steel 65G (65G1) Steel 65GA Steel 65S2VA Steel 68A Steel 68GA Steel 70 Steel 60S2HG Steel 70G2 Steel 70S2HA (EI142) Steel 70C3A 70KhGFA steel Steel 75 Steel 80 Steel 85 KT-2 steel KT-3 steel Steel 55S2A Steel 3K-7 Steel 40P Steel 50RA (50P) 50KhG steel 50KhGA steel 50KhGFA steel Steel 50KhFA (50KhF) 51KhFA steel Steel 55C2 Steel 60С2Х (60С2ХА; 60С2ХАA) Steel 55S2GF Steel 55KhGR Steel 55KhFA (55KhF) 60G steel Steel 60C2 Steel 60S2A Steel 60S2G Steel 60C2H2A

Designation

Name The value
Designation GOST Cyrillic 70
Designation GOST Latin 70
Transliteration 70
The chemical elements 70

Description

Steel 70 used: for the production of springs, springs and other parts which require higher strength and elastic properties and wear resistance; wire square, rectangular and trapezoidal cross-sections designed for the manufacture of spring washers; blades of earth-moving machinery (bulldozers, scrapers, graders and graders, as well as to the dozer and grader blades equipment excavators, rollers and other earth moving machines); cold-rolled heat-treated ribbon with a thickness of 0.05 to 1.30 mm and rolled heat-treated strip thickness 0.15−2.00 mm for the manufacture of spring details and springs, with the exception of the crown; hardened and tempered wire carded round and shaped steel used in the manufacture of brackets needle products; wire square, rectangular and trapezoidal cross-sections designed for the manufacture of spring washers; tinned wire for the manufacture of tires rotors of electric machines.

Note

Steel spring carbon.

Standards

Name Code Standards
Sectional and shaped rolling В22 GOST 1133-71, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 9234-74, GOST 11474-76, GOST 17152-89, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Armature, units and details of rolling stock of railways Д55 GOST 11530-93
Sheets and stripes В33 GOST 1577-93, GOST 4405-75, TU 14-1-417-72, TU 14-1-4516-88, TU 14-1-634-73
Tapes В34 GOST 2284-79, GOST 21996-76, GOST 21997-76, TU 14-4-101-87, TU 4-14-100-84, TU 14-1-3656-83, TU 14-4-100-84, TU 14-4-149-72
Low-carbon steel wire В71 GOST 3875-83
Steel wire medium- and high-carbon В72 GOST 7348-81, GOST 9124-85, GOST 9389-75, GOST 11850-72, GOST 26366-84, TU 14-178-110-89, TU 14-4-777-76, TU 14-171-35-89
Sectional and shaped rolling В32 GOST 7417-75, GOST 7419-90, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 14959-79, TU 14-1-2118-77, TU 14-1-666-73, TU 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008
Sheets and stripes В23 GOST 82-70, GOST 19903-74, GOST 19903-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
GOST 17152-89 (ИСО 7129-82 0.67-0.75 ≤0.035 ≤0.035 0.5-0.8 ≤0.25 0.17-0.37 ≤0.25 The rest ≤0.2
GOST 14959-79 0.67-0.75 ≤0.035 ≤0.035 0.5-0.8 ≤0.25 0.17-0.37 ≤0.25 The rest ≤0.2
Fe is the basis.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % d4 y, % Brinell hardness number, MPa HV, MPa
Cold-rolled steel strip of 0.1-4.0 mm in the delivery state according to GOST 2284-79
- - 440-740 - ≥10 - - -
- - 440-640 - ≥10 - - -
- - 740-1130 - - - - -
Rolled steel. Normalization
≤80 ≥510 ≥910 ≥17 - ≥29 ≥252 -
Carden wire 0.2-0.8 mm as supplied by GOST 3875-83 (samples)
- - 1960-2160 - - - - -
- - 2161-2350 - - - - -
Tape cold-rolled heat-treated (0,05-1,30 mm) for spring parts and springs according to GOST 21996-76 and flattened strip (0,15-2,00 mm) according to GOST 21997-76 (listed group strength tape)
- - 1270-1570 - - - - 375-485
- - 1580-1860 - - - - 486-600
- - ≥1860 - - - - ≥600
Wire square, rectangular and trapezoidal cross sections according to GOST 11850-72
0.6-12 - 590-780 - - - - -
0.6-12 - 490-780 - - - - -
0.6-3 - ≤1130 - - - - -
0.6-3 - ≤980 - - - - -
0.6-3 - ≤1230 - - - - -
Wire. Quenching in oil from 920 °C (tмасла=40 °C, exposure for 1 min) + off if you have 500 °With (extract 15 min), air cooling
≤6.5 - ≥1240 ≥7 - ≥47 ≥315 -
Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Hardened in oil from 830 °C to + vacation at 470 °C
≥835 ≥1030 ≥9 - ≥30 - -

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
y The relative narrowing
HV The Vickers hardness

Physical characteristics

Temperature Е, ГПа G, ГПа r, кг/м3 l, Вт/(м · °С) a, 10-6 1/°С С, Дж/(кг · °С)
0 206 78 7810 - - -
20 206 - 7810 - - -
100 - - - 68 115 483
200 - - - 52 123 483
300 - - - 37 13 -
400 - - - 29 13 487
600 - - - - 138 521
800 - - - - - 567

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

Technological properties

Name The value
Weldability Does not apply to welded structures. The CCC followed by heat treatment.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1200 °C, the end - 850 °C.
Flock-sensitive sensitivity Insensitive.
Workability by cutting When NV 183-241 Kn TV.SPL.=0,7 Kn b.St.=0,6.

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