Steel 75
Designation
| Name |
The value |
| Designation GOST Cyrillic |
75 |
| Designation GOST Latin |
75 |
| Transliteration |
75 |
| The chemical elements |
75 |
Description
75 steel is used: for the manufacture of round and flat springs of various sizes, valve springs car engine, spring shock absorbers, springs, locking washers, clutch discs, Cams, spindles, shims and other parts operating in conditions of friction and under the action of static loads and vibration loads; knives earthmoving machinery (bulldozers, scrapers, graders and graders, as well as to the dozer and grader blades equipment excavators, rollers and other earth moving machines).
Note
Steel spring carbon.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 17152-89, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Sheets and stripes |
В33 |
GOST 4405-75 |
| Steel wire medium- and high-carbon |
В72 |
GOST 7348-81, GOST 9389-75, GOST 26366-84 |
| 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 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008 |
| Sheets and stripes |
В23 |
GOST 82-70, GOST 103-2006 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 17152-89 (ИСО 7129-82 |
0.72-0.8 |
≤0.035 |
≤0.035 |
0.5-0.8 |
≤0.25 |
0.17-0.37 |
≤0.25 |
The rest |
≤0.2 |
| GOST 14959-79 |
0.72-0.8 |
≤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, % |
y, % |
| Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Quenching in oil from 820 °C to + Vacation at 470 °C |
|
≥885 |
≥1080 |
≥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 |
| y |
The relative narrowing |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
| 0 |
191 |
78 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
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 - 1180 °C, the end - of 800 °C. the cross Section up to 220 mm are cooled in the wells. |
| Flock-sensitive sensitivity |
insensitive |
