Steel 70
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. |
