Steel 15Х11МФБЛ

Designation

Name The value
Designation GOST Cyrillic 15Х11МФБЛ
Designation GOST Latin 15X11MFBL
Transliteration 15H11MFBL
By chemical elements 15Cr11MoVNb

Description

15Х11МФБЛ steel is used: for the manufacture of castings parts, steam, gas, hydraulic turbines, and axial compressors and other parts operating at temperatures up to +580 °C.

Note

Martensite steel-ferritic class.

Standards

Name Code Standards
Steel castings В82 OST 108.961.04-80
Welding and cutting metals. Soldering, riveting В05 RTM 108.020.122-78

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo Nb
OST 108.961.04-80 0.13-0.2 ≤0.025 ≤0.03 0.6-1 10-12 ≤0.55 0.5-0.9 Rest ≤0.3 0.2-0.3 0.8-1.05 0.1-0.25
Fe is the basis.

Mechanical properties

sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Casting parts of gas turbines. Annealing at 710-730 °C (extract 10-15 h), cooling with the furnace to 200 °C + normalization at 1130-1150 °C, air cooling + with the normalization 1040-1060 °C, air cooling (water mixture for large castings) + vacation at 750-770 °C, air cooling
≥471 ≥608 ≥13 ≥35 ≥290 192-248

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
HB Brinell hardness number

Technological properties

Name The value
Welding defects Welding defects of castings after cutting is carried out with preliminary and attendant heating to 400-450 °C. Welding defects by manual welding is done with electrodes type e-12Х11НВМФ (GOST 10052) brand LPS-10.