Steel 12KH25N5TMFL (10Х25Н5ТМФЛ)

Designation

Name The value
Designation GOST Cyrillic 12Х25Н5ТМФЛ
Designation GOST Latin 12X25H5TMFL
Transliteration 12H25N5TMFL
By chemical elements 12Cr25Н5TiMoV
Name The value
Designation GOST Cyrillic 10Х25Н5ТМФЛ
Designation GOST Latin 10X25H5TMFL
Transliteration 10H25N5TMFL
By chemical elements 10Cr25Н5TiMoV

Description

12KH25N5TMFL steel is used: for the manufacture of casting valves chemical industry, aviation parts and other industries; parts operating under high pressure up to 300 bar (30 MPa).

Note

Steel corrosion resistant, heat resistant (up to +600°C) austenitic-ferritic class.

Standards

Name Code Standards
Castings with special properties (iron and steel) В83 GOST 2176-77
Steel castings В82 GOST 977-88

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N V Ti Mo
GOST 977-88 ≤0.12 ≤0.03 ≤0.03 0.3-0.8 23.5-26 0.2-1 5-6.5 Rest - 0.08-0.2 0.07-0.15 0.08-0.2 0.06-0.12
GOST 2176-77 ≤0.12 ≤0.03 ≤0.03 0.3-0.8 23.5-26 0.2-1 5-6.5 Rest ≤0.3 0.08-0.2 0.07-0.15 0.08-0.2 0.06-0.12
Fe is the basis.
According to GOST 2176-77 the chemical composition is given for steel grade 12X25N5TMFL. Deviations from the norms of chemical composition are allowed: for carbon ± 0.020%; for silicon ± 0.10%; on manganese, copper, chromium and nickel ± 0.10% each; by titanium and tungsten ± 0.050% each; by vanadium, molybdenum and niobium ± 0.020% each.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Quenching with 1140-1160 °C, cooling with the furnace to 970-990 °C, further cooled in oil
100 ≥392 ≥540 ≥12 ≥40 ≥294

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