Designation
| Name |
The value |
| Designation GOST Cyrillic |
40Х2Н2МА |
| Designation GOST Latin |
40X2H2MA |
| Transliteration |
40H2N2MA |
| By chemical elements |
40Cr2Н2Mo |
Description
40Х2Н2МА steel is used: for the manufacture of large products, shafts, wheels, gear pinions, as well as special fasteners.
Note
Structural steel high-quality romancelatina.
Standards
| Name |
Code |
Standards |
| Sheets and strips |
В23 |
GOST 103-2006 |
| Bars and shapes |
В22 |
GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Bars and shapes |
В32 |
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 |
| Processing of metals by pressure. Forgings |
В03 |
GOST 8479-70, ST ЦКБА 010-2004 |
| Blanks. Of the workpiece. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
| GOST 4543-71 |
0.35-0.42 |
≤0.025 |
≤0.025 |
0.3-0.6 |
1.25-1.65 |
0.17-0.37 |
1.35-1.75 |
Rest |
≤0.3 |
≤0.05 |
≤0.03 |
0.2-0.3 |
Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%. When the alloying Mo is replaced with W, the designation of the steel grade will be 40Х2Н2ВА.
Mechanical properties
| Section, mm |
t отпуска, °C |
sT|s0,2, MPa |
σU, MPa |
d5, % |
d10 |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Quenching in oil from 870 °C to + vacation at 600 °C, cooling in water or oil |
| ≤25 |
- |
930 |
1080 |
10 |
- |
45 |
765 |
- |
| Hire. Quenching in oil from 950 °C to + vacation at 580-600 °C (named place of clippings sample) |
| 300-500 |
- |
770 |
960 |
- |
17 |
- |
520 |
- |
| Quenching + tempering (forgings) |
| 300-500 |
- |
590 |
735 |
12 |
- |
35 |
432 |
235-277 |
| The oil quenching from 870 °C to + vacation |
| - |
400 |
1230 |
1400 |
12 |
- |
49 |
- |
430 |
| Hire. Quenching in oil from 950 °C to + vacation at 580-600 °C (named place of clippings sample) |
| 500-700 |
- |
740 |
930 |
- |
17 |
- |
- |
- |
| Quenching + tempering (forgings) |
| 300-500 |
- |
640 |
785 |
11 |
- |
33 |
432 |
248-293 |
| The oil quenching from 870 °C to + vacation |
| - |
500 |
1090 |
1200 |
16 |
- |
60 |
- |
350 |
| Hire. Quenching in oil from 950 °C to + vacation at 580-600 °C (named place of clippings sample) |
| 700-900 |
- |
700 |
890 |
- |
16 |
- |
451 |
- |
| Quenching + tempering (forgings) |
| ≤100 |
- |
735 |
880 |
13 |
- |
40 |
579 |
277-321 |
| The oil quenching from 870 °C to + vacation |
| - |
600 |
850 |
950 |
20 |
- |
62 |
- |
280 |
| Hire. Quenching in oil from 950 °C to + vacation at 580-600 °C (named place of clippings sample) |
| 300-500 |
- |
760 |
930 |
- |
11 |
- |
216 |
- |
| 500-700 |
- |
730 |
880 |
- |
11 |
- |
265 |
- |
| 700-900 |
- |
700 |
870 |
- |
11 |
- |
235 |
- |
| 300-500 |
- |
760 |
930 |
- |
15 |
- |
559 |
- |
| 500-700 |
- |
740 |
900 |
- |
17 |
- |
442 |
- |
| 700-900 |
- |
710 |
850 |
- |
7 |
- |
255 |
- |
| 500-700 |
- |
790 |
900 |
- |
- |
- |
147 |
- |
| 300-500 |
- |
740 |
930 |
- |
11 |
- |
226 |
- |
| 700-900 |
- |
690 |
730 |
- |
- |
- |
196 |
- |
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 |
| d10 |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
| HB |
Brinell hardness number |
Technological properties
| Name |
The value |
| Weldability |
difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment. |
| 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 |
sensitive |
