Alloy 20Х25Н20С

Designation

Name The value
Designation GOST Cyrillic 20Х25Н20С
Designation GOST Latin 20X25H20C
Transliteration 20H25N20S
By chemical elements 20Cr25Ni20Pb

Description

Alloy 20Х25Н20С used: for the manufacture of pipes tsentrobezhnolityh for the manufacture of the coils of the tubular furnace installations production of ammonia, hydrogen, ethylene, carbon disulphide, etc., operating in the temperature range 760−1060 °C and a pressure of 3.92 MPa (40 kgf/cm2); seamless hot — and cold-drawn pipes used in the production of ammonia, hydrogen, methanol, ethylene, carbon disulphide etc.

Standards

Name Code Standards
Steel pipes and fittings to them В62 TU 1333-047-00220302-02, TU 1320-003-18648658-00

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu As Al V Ti Mo Zn Sn Pb
TU 1320-003-18648658-00 0.2-0.25 ≤0.03 ≤0.03 0.8005-1.51 23-27 1.1995-1.74 19-22 Rest ≤0.2 ≤0.01 0.0005-0.1 0.0005-0.2 0.0005-0.1 ≤0.5 ≤0.01 ≤0.01 ≤0.01
Fe is the basis.

Mechanical properties

sT|s0,2, MPa σU, MPa d5, % y, %
Seamless pipes hot and cold-of an external diameter 25-168 mm. Quenching in water or air from 1100-1150 °C
≥245 ≥441 ≥10 ≥10
Tsentrobezhnolityh pipe outer diameter 85-320 mm. Quenching in water or air from 1100-1150 °C
≥245 ≥441 ≥10 ≥10

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