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. |
