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 |
- |
| 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 |