Designation
Name |
The value |
Designation GOST Cyrillic |
20Х2МА |
Designation GOST Latin |
20X2MA |
Transliteration |
20H2MA |
By chemical elements |
20Cr2Mo |
Description
20Х2МА steel is used: for the production of pipes for pipelines in the units for ammonia production with a working pressure of PN=31 MPa (320 kgf/cm2).
Standards
Name |
Code |
Standards |
Processing of metals by pressure. Forgings |
В03 |
TU 108-11-432-79 |
Blanks. Of the workpiece. Slabs |
В31 |
TU 14-134-409-2004 |
Steel pipes and fittings to them |
В62 |
TU 14-3-433-75, TU 14-134-291-91 |
Chemical composition
Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Mo |
TU 14-134-291-91 |
0.18-0.24 |
≤0.03 |
≤0.01 |
0.3-0.7 |
2.1-2.5 |
0.17-0.37 |
≤0.3 |
Rest |
≤0.3 |
0.25-0.35 |
Fe is the basis.
Mechanical properties
sT|s0,2, MPa |
σU, MPa |
d5, % |
KCU, kJ/m2 |
HB, MPa |
Tubular billet on the other 14-134-409-2004 the pipe THAT 14-3-433-75 in the state of delivery of heat treated (longitudinal samples) |
≥412 |
≥588 |
≥14 |
≥588 |
- |
≥392 |
≥490 |
- |
- |
174-248 |
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 |
KCU |
Toughness |
HB |
Brinell hardness number |