Steel 38ХМА

Designation

Name The value
Designation GOST Cyrillic 38ХМА
Designation GOST Latin 38XMA
Transliteration 38HMA
By chemical elements 38CrMo

Description

38ХМА steel is used: for the manufacture of critical parts for General purpose in mechanical engineering.

Note

Structural steel CR-mo high quality.

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 14955-77, 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
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HRC
Quenching in oil from 850 °C + vacation
- 200 1600 1860 10 42 432 61
- 300 1470 1670 10 40 383 51
- 400 1270 1420 10 41 383 42
- 500 1130 1250 13 48 785 38
- 600 860 980 18 58 1324 30
Quenching in oil from 850 °C + vacation at 580-600 °C, air cooling
≤25 - 885 980 11 45 677 -
Hardening in water from 850 °C + vacation at 600 °C, air cooling (named place of clippings sample)
120-160 - 820 950 17 57 1020 -
160-200 - 800 940 16 59 775 -
120-160 - 680 860 17 57 608 -
160-200 - 630 800 18 54 697 -
40-80 - 880 1030 15 51 608 -
80-120 - 710 910 17 51 922 -
Quenching in oil from 850 °C + vacation at 600 °C, air cooling (named place of clippings sample)
160-200 - 660 850 18 56 608 -
≤30 - 880 1000 18 57 1010 -
160-200 - 590 770 19 55 628 -

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
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa G, HPa l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
0 211 84 33 257 - -
20 211 - 33 257 - -
100 201 80 35 280 124 496
200 194 78 38 310 131 508
300 184 73 39 380 137 525
400 174 69 36 470 142 538
500 169 65 34 580 145 567
600 166 62 33 720 146 600
700 141 55 31 870 147 672
800 129 48 27 1060 147 672
1000 - - - - 112 697

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