Steel 20KH12VNMFL

Designation

Name The value
Designation GOST Cyrillic 20Х12ВНМФЛ
Designation GOST Latin 20X12BHMFL
Transliteration 20H12VNMFL
By chemical elements 20Cr12WНMoV

Description

20KH12VNMFL steel is used: for the manufacture of cast turbine components (cylinders, nozzles, diaphragms and valves) with operating temperatures up to +600 °C.

Note

Steel corrosion resistant, heat resistant (up to +650 °C) martensite 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 V Mo W
GOST 977-88 0.17-0.23 ≤0.025 ≤0.03 0.5-0.9 10.5-12.5 0.2-0.6 0.5-0.9 Rest - 0.15-0.3 0.5-0.7 0.7-1.1
GOST 2176-77 0.17-0.23 ≤0.025 ≤0.03 0.5-0.9 10.5-12.5 0.2-0.6 0.5-0.9 Rest ≤0.3 0.15-0.3 0.5-0.7 0.7-1.1
Fe is the basis.
According to GOST 2176-77 the chemical composition is given for steel grade 20Х12ВНМФЛ. 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
Annealing, vacation at 710-730 °C (extract 10-15 h), cooling with the furnace to 200 °C + double normalization at 1100 °C and 1050 °C, cooling rate of at least 300 °C/h (blowing air) + vacation at 710-730 °C (extract 10-15 h), cooling with the furnace to 200 °C, air cooling
100 ≥491 ≥589 ≥15 ≥30 ≥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