Steel 75ХМ

Designation

Name The value
Designation GOST Cyrillic 75ХМ
Designation GOST Latin 75XM
Transliteration 75HM
By 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
Processing of metals by pressure. 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 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 properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, 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
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
KCU Toughness
HB Brinell hardness number

Physical characteristics

Temperature r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
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.
Склонность к отпускной хрупкости tend not
The temperature of forging 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
Machinability In the normalized condition Kn TV.SPL.=0.90 Kn b.St.=0.60