Steel 30Х3МФСА

Designation

Name The value
Designation GOST Cyrillic 30Х3МФСА
Designation GOST Latin 30X3MFCA
Transliteration 30H3MFSA
By chemical elements 30Cr3MoVС

Description

30Х3МФСА steel is used: for the production of hot-rolled calibrated steel used for the manufacture of parts for shipbuilding, special and military equipment in the heat-treated and nitride state.

Note

Structural steel high-quality chrome-molybdenum-vanadium. Steel heat resistant up to 500 °C.

Standards

Name Code Standards
Test methods. Packing. Marking В09 ADU8-TU

Chemical composition

Standard C S P Mn Cr Si Fe Cu V Mo
ADU8-TU 0.28-0.35 ≤0.025 ≤0.025 0.5-0.8 2.8-3.3 0.6-1 Rest ≤0.3 0.6-1 0.3-0.5
Fe is the basis.
According to ADU8-TU, the chemical composition is given for steel grade 30X3MFSA. In the steel grade 30X3MFSA-SH, the mass fraction of sulfur is not more than 0.015%, phosphorus - no more than 0.025%, copper - no more than 0.25%. The presence in the steels of 30X3MFSA and 30X3MFSA-III grades of residual titanium mass fraction up to 0.030% and tungsten up to 0.20% is not a defective feature. Permissible deviations from the norms of chemical composition in accordance with GOST 4543.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2 HB, MPa
Calibrated hot-rolled steel as supplied for АДУ8-TU. Quenching in oil from 950±15 °C + Vacation at 660-680 °C, air cooling (graph toughness given a value KCV)
25 ≥784 ≥890 ≥10 ≥45 ≥800 302-269

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
d Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number

Technological properties

Name The value
Macrostructure and pollution Steel control on the contamination of non-metallic inclusions (FROM,OS,SH,SP,SN,S). For steel ESR allowable non-metallic inclusions not greater than 3 points for all types of inclusions. For ordinary steel smelting - the rules optional , but shall be recorded in the certificate. Grain size-steel is not larger than the number 5 on a scale of I GOST 5639.
Features of heat treatment In accordance with an order of hot-rolled steel АДУ8 THAT put in the heat-treated and without heat treatment, and calibrated in the released condition. Brinell hardness number hot rolled, heat treated steel should not exceed 269 HB (indentation diameter not less than 3.7 mm).