Steel 75ХМ
Designation
| Name |
The value |
| Designation GOST Cyrillic |
75ХМ |
| Designation GOST Latin |
75XM |
| Transliteration |
75HM |
| The chemical elements |
75CrMo |
Description
75ХМ steel is used: for the production of forgings of various parts of General engineering; work and backup rolls in sheet mills for hot rolling of metals; backup rolls for hot rolling of ferrous metals; backup rolls two — and four-roll stands sheet mills for cold rolling of metals.
Standards
| Name |
Code |
Standards |
| Metal forming. Forgings |
В03 |
TU 108-11-905-87, TU 4121-002-33902054-2004, TU 108.11.917-87 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Mo |
| TU 108.11.917-87 |
0.7-0.8 |
≤0.03 |
≤0.03 |
0.2-0.7 |
1.4-1.7 |
0.2-0.6 |
≤0.5 |
The rest |
0.2-0.3 |
Fe is the basis.
According to TU 108.11.917-87, after processing the steel, a limitation on the content of sulfur and phosphorus is introduced on the OSRV. The total content of sulfur and phosphorus after OSRV ≤ 0.050%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Forgings. Normalizing at 950 °C + Normalization at 820 °C + Vacation at 500 °C (exposure 4 h), air cooling (named place of cutting of the sample and the cutting direction) |
| 500 |
≥375 |
≥740 |
≥21 |
≥31 |
≥150 |
≥197 |
| 700 |
≥440 |
≥790 |
≥6 |
≥6 |
≥240 |
≥229 |
| 500 |
≥430 |
≥750 |
≥19 |
≥41 |
≥240 |
≥199 |
| 700 |
≥660 |
≥1040 |
≥10 |
≥13 |
≥200 |
≥285 |
| 500 |
≥450 |
≥770 |
≥19 |
≥36 |
≥310 |
≥207 |
| 700 |
≥425 |
≥840 |
≥16 |
≥21 |
≥240 |
≥229 |
| 500 |
≥420 |
≥750 |
≥22 |
≥46 |
≥570 |
≥207 |
| 700 |
≥650 |
≥1060 |
≥13 |
≥20 |
≥220 |
≥285 |
| 500 |
≥365 |
≥740 |
≥9 |
≥9 |
≥220 |
≥211 |
| 700 |
- |
- |
- |
- |
≥190 |
≥229 |
| 500 |
≥410 |
≥750 |
≥21 |
≥34 |
≥170 |
≥199 |
| 700 |
- |
≥590 |
- |
- |
≥40 |
≥313 |
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 |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
С, Дж/(кг · °С) |
| 0 |
7900 |
- |
- |
| 20 |
7900 |
- |
- |
| 100 |
- |
45 |
490 |
| 200 |
- |
41 |
500 |
| 300 |
- |
40 |
530 |
| 400 |
- |
39 |
570 |
| 500 |
- |
38 |
640 |
| 600 |
- |
37 |
750 |
| 700 |
- |
35 |
900 |
| 800 |
- |
24 |
700 |
| 900 |
- |
31 |
760 |
| 1000 |
- |
- |
760 |
| 1200 |
- |
- |
810 |
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. |
| Propensity to temper brittleness |
tend not |
| Forging temperature |
Start - 1200 °C, the end - of 800 °C. the cross Sections up to 100 mm are cooled in air, 101-350 mm - in the pit. |
| Flock-sensitive sensitivity |
insensitive |
| Workability by cutting |
In the normalized condition Kn TV.SPL.=0.90 Kn b.St.=0.60 |
