Designation
| Name |
The value |
| Designation GOST Cyrillic |
75 |
| Designation GOST Latin |
75 |
| Transliteration |
75 |
| By 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 |
| Bars and shapes |
В22 |
GOST 1133-71, GOST 17152-89, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Sheets and strips |
В33 |
GOST 4405-75 |
| Steel wire medium and high carbon |
В72 |
GOST 7348-81, GOST 9389-75, GOST 26366-84 |
| 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 14-11-245-88, TU 14-1-1271-75, TU 14-136-367-2008 |
| Sheets and strips |
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 |
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 |
Rest |
≤0.2 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, 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 |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
Physical characteristics
| Temperature |
Е, HPa |
G, HPa |
| 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. |
| Склонность к отпускной хрупкости |
tend not |
| The temperature of forging |
Start - 1180 °C, the end - of 800 °C. the cross Section up to 220 mm are cooled in the wells. |
| Flock-sensitive sensitivity |
insensitive |
