Steel 70

Designation

Name	The value
Name	The value
Designation GOST Cyrillic	70
Designation GOST Latin	70
Transliteration	70
By 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
Name	Code	Standards
Bars and shapes	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
Fittings, components and parts for railway rolling stock	Д55	GOST 11530-93
Sheets and strips	В33	GOST 1577-93, GOST 4405-75, TU 14-1-417-72, TU 14-1-4516-88, TU 14-1-634-73
Tape	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
Bars and shapes	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 strips	В23	GOST 82-70, GOST 19903-74, GOST 19903-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu
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	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	Rest	≤0.2

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	y, %	HB, MPa	HV, MPa
Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	y, %	HB, 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
Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
d₄	Elongation after rupture
y	The relative narrowing
HB	Brinell hardness number
HV	The Vickers hardness

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
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
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
Name	The value
Weldability	Does not apply to welded structures. The CCC followed by heat treatment.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1200 °C, the end - 850 °C.
Flock-sensitive sensitivity	Insensitive.
Machinability	When NV 183-241 Kn TV.SPL.=0,7 Kn b.St.=0,6.