Steel 55KHGR
Designation
| Name |
The value |
| Designation GOST Cyrillic |
55ХГР |
| Designation GOST Latin |
55XGP |
| Transliteration |
55HGR |
| The chemical elements |
55CrMnB |
Description
55KHGR steel is used: for the manufacture of spring steel strip thickness 3,0−24,0 mm.
Note
Steel spring alloy quality.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В23 |
GOST 103-2006 |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Steel wire medium- and high-carbon |
В72 |
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 14-136-367-2008 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
B |
| GOST 14959-79 |
0.52-0.6 |
≤0.035 |
≤0.035 |
0.9-1.2 |
0.9-1.2 |
0.17-0.37 |
≤0.25 |
The rest |
≤0.2 |
0.001-0.003 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
HRC |
| Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Quenching in oil from 850 °C + vacation at 470 °C |
|
- |
≥1175 |
≥1270 |
≥7 |
≥35 |
- |
- |
| Rolled steel. Hardened in oil from 830 °C to + Vacation |
| - |
350 |
≥1760 |
≥1910 |
≥7 |
≥38 |
≥500 |
≥51 |
| - |
400 |
≥1620 |
≥1810 |
≥7 |
≥40 |
≥530 |
≥49 |
| - |
450 |
≥1420 |
≥1570 |
≥9 |
≥41 |
≥579 |
≥45 |
| - |
500 |
≥1180 |
≥1370 |
≥11 |
≥47 |
≥696 |
≥41 |
| - |
550 |
≥1080 |
≥1180 |
≥12 |
≥51 |
≥834 |
≥37 |
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 |
| kJ/m2 |
Toughness |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
