Steel 30KHM

Designation

Name The value
Designation GOST Cyrillic 30ХМ
Designation GOST Latin 30XM
Transliteration 30HM
By chemical elements 30CrMo

Description

30KHM steel is used: for the manufacture of gears, shafts, axles, pins, nuts, bolts and various other parts operating at temperatures up to 450−500 °C.

Note

Structural steel high-quality chrome-molybdenum.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings В03 GOST 8479-70
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90, TU 14-1-904-74

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.26-0.34 ≤0.035 ≤0.035 0.4-0.7 0.8-1.1 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 ≤0.03 0.15-0.25 ≤0.2
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Quenching in oil at 880 °C + vacation at 540 °C, cooling in water or oil
≤15 - 735 930 11 45 765 - -
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
100 - 700 830 17 65 137 - 27
Quenching + tempering (forgings)
100 - 395 615 17 45 481 187-229 -
Quenching in oil at 880 °C
- 200 1320 1520 12 50 69 - 49
Quenching in oil at 880 °C to + vacation at 650 °C
- - 590 730 20 70 186 - -
Normalization at 860 °C
100-150 - 350 600 16 45 392 - -
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
80 - 760 890 14 64 108 - 30
Quenching + tempering (forgings)
100-300 - 440 635 16 45 579 197-235 -
Quenching in oil at 880 °C
- 300 1330 1450 11 51 49 - 45
Quenching in oil at 880 °C to + vacation at 650 °C
- - 490 660 21 70 - - -
Annealing at 860-880 °C
100 - 300 550 18 45 - - -
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
120 - 690 840 18 63 118 - 25
Quenching + tempering (forgings)
100 - 440 635 14 40 530 197-235 -
Quenching in oil at 880 °C
- 400 1220 1370 12 55 69 - 42
Quenching in oil at 880 °C to + vacation at 650 °C
- - 520 710 21 69 206 - -
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
40 - 790 930 13 61 118 - 30
Quenching + tempering (forgings)
100 - 490 655 16 45 579 212-248 -
Quenching in oil at 880 °C
- 500 1080 1130 16 60 127 - 36
Quenching in oil at 880 °C to + vacation at 650 °C
- - 480 630 22 75 199 - -
Quenching in water from 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
60 - 740 870 16 64 127 - 31
Quenching in oil at 880 °C to + vacation at 650 °C
- - 430 500 22 80 142 - -
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
100 - 610 780 18 64 147 - 25
Quenching in oil at 880 °C to + vacation at 650 °C
- - 340 330 29 89 142 - -
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
80 - 660 790 17 67 137 - 25
A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
- - 80 130 69 67 - - -
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
120 - 620 750 16 63 137 - -
A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
- - 41 56 64 100 - - -
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
40 - 650 820 17 71 147 - 27
A sample with a diameter of 6 mm, length 30 mm, pressed. The rate of deformation of 16 mm/min strain Rate of 0.009 1/s
- - 14 26 55 100 - - -
Quenching in oil at 880 °C to + leave at 500 °C (indicated as the place of clippings sample)
60 - 630 800 17 69 157 - 27

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
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
0 208 7820 - 230 - -
20 208 7820 - 270 - -
100 207 7800 46 - 116 462
200 204 7770 44 334 125 -
300 197 7740 42 425 132 462
400 188 7700 42 524 139 -
500 176 7660 39 628 138 -
600 160 - 37 757 146 -
700 - - 36 - 143 -
800 - - 32 - - -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability limited weldability. Welding methods: SMAW, ADS under flux and gas protection. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости tend not
The temperature of forging Start - 1260 °C, the end - 760 °C-800. Cross-section up to 100 mm are cooled in air, 101-300 mm - mulde.
Flock-sensitive sensitivity insensitive
Machinability After quenching and tempering at NV are 229-269 blower SB=930 MPa Kn TV.SPL.=0.7 Kn b.St.=0.3