Steel 20ХН3МФА (20ХН3МФ)

Designation

Name The value
Designation GOST Cyrillic 20ХН3МФА
Designation GOST Latin 20XH3MFA
Transliteration 20HN3MFA
By chemical elements 20CrН3MoV
Name The value
Designation GOST Cyrillic 20ХН3МФ
Designation GOST Latin 20XH3MF
Transliteration 20HN3MF
By chemical elements 20CrН3MoV

Description

20ХН3МФА steel is used: for the manufacture of forgings of shafts of compressors and gas turbines, responsible for heavy-loaded parts operating at temperatures up to +500 °C.

Note

Structural steel high-quality hromonikelemolibdenovyh.

Standards

Name Code Standards
Blanks. Of the workpiece. Slabs В31 TU НЗЛ 341-93
Processing of metals by pressure. Forgings В03 TU НЗЛ 342-89

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo
TU НЗЛ 342-89 0.2-0.25 ≤0.02 ≤0.02 0.4-0.7 1.4-1.8 0.2-0.45 3-3.5 Rest ≤0.3 0.06-0.12 0.4-0.6
Fe is the basis.
According to TU NZL 342-89 the chemical composition is given for steel grade 20ХН3МФА.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Forged billet shafts of compressors and gas turbines, heat-treated in the delivery condition on the other NZL 342-89 (longitudinal samples, in the column of the delivery condition specified strength)
≤350 590-785 ≥705 ≥15 ≥35 ≥490
≤250 687-883 ≥803 ≥14 ≥35 ≥490

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

Technological properties

Name The value
Weldability Does not apply to welded structures.
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 was cooled in the pit, over 100 mm are subjected to low temperature annealing.
Flock-sensitive sensitivity Excessively sensitive.