15H11MF, 15H12WMF, 15Ch11MF, 15Ch12VNMF - boiler steel, data according to GOST 18968-73 and OST 108.958.04-85
Table of content:
| Standard | Grade | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition % | |||||||||||||||
| C: | Si: | Mn: | P: | S: | Cr: | Mo: | Ni: | V: | W: | ||||||
| PN | 15H11MF | ||||||||||||||
| 0.11-0.18 | <0.5 | <0.6 | <0.03 | <0.025 | 10.0-12.0 | 0.5-0.7 | <0.6 | 0.25-0.40 | - | ||||||
| GOST | 15Ch11MF / 1Ch11MF | ||||||||||||||
| 0.12-0.19 | <0.5 | <0.7 | <0.03 | <0.025 | 10.0-11.5 | 0.6-0.8 | <0.6 | 0.25-0.40 | <0.2 | ||||||
| PN | 15H12WMF | ||||||||||||||
| 0.12-0.18 | <0.04 | 0.5-0.9 | <0.03 | <0.03 | 11.0-12.5 | 0.5-0.7 | 0.4-0.8 | 0.15-0.30 | 0.7-1.1 | ||||||
| GOST | 15Ch12VNMF | ||||||||||||||
| 0.12-0.18 | <0.04 | 0.5-0.9 | <0.03 | <0.025 | 11.0-13.0 | 0.5-0.7 | 0.4-0.8 | 0.15-0.30 | 0.7-1.1 | ||||||
15H11MF, 15H12WMF, 15Ch11MF, 15Ch12VNMF - description
Chromium-Molybdenum-Tungsten-Vanadium (-Tungsten, in case of 15Ch12VNMF) heat-resistant steel used in the power industry. Applied mainly for blades of steam turbines, valve spindles and other components operating in high temperature (up to 600°C), fasteners for example. It has great vibration damping capacity.
The steel is hard to weld. Welding of Chromium-Molybdenum-Vanadium steel should not take place at a temperature lower than 10°C. Proper preparation of the surface and preheating is required before welding. The recommended preheating temperature is about 250-300°C. Don't heat faster than 30-50°C per hour. The entire welding area must be thoroughly heated. Cover the joint with asbestos after the process to slower cooling.
Physical and mechanical properties
15Ch11MF - general mechanical properties in heat-treated condition (bars <60mm thick):
- Yield strength Re: 590-755 MPa
- Tensile strength Rm: > 740 MPa
- Elongation A: > 15 %
- Percent reduction of area Z: > 50 %
- Hardness HB: 229-269
- Diameter cone impression: 3.7-4.0 mm
- Impact Value KCU. 20°C: > 59 J/sm2
15Ch11MF - mechanical properties in annealed condition:
- Hardness HB: < 229
- Diameter cone impression: > 4 mm
Mechanical properties of 15Ch11MF forgings for turbines and compressors (KP50 strength group):
- Thickness: < 250 mm
- Re: > 490 MPa
- Rm: > 685 MPa
- A: > 14 %
- Z: > 40 %
- HB: 212-248
- KCU. 20°C: > 59 J/sm2
- Thickness: < 200 mm
- Re: 490-605 MPa
- Rm: > 685 MPa
- A: > 16 %
- Z: > 50 %
- HB: 212-248
- KCU. 20°C: > 59 J/sm2
Mechanical properties of 15Ch11MF forgings for turbines and compressors (KP55 strength group):
- Re: > 540 MPa
- Rm: > 685 MPa
- A: > 13 %
- Z: > 35 %
- HB: 232-262
- KCU. 20°C: > 49 J/sm2
Mechanical properties of 15Ch11MF forgings for turbines and compressors ("KP55 S" strength group):
- Re: 540-665 MPa
- Rm: > 705 MPa
- A: > 15 %
- Z: > 50 %
- HB: 232-262
- KCU. 20°C: > 59 J/sm2
15Ch12VNMF - general mechanical properties in heat-treated condition (bars <60mm thick):
- Yield strength Re: 590-735 MPa
- Tensile strength Rm: > 740 MPa
- Elongation A: > 15 %
- Percent reduction of area Z: > 50 %
- Hardness HB: 229-269
- Diameter cone impression: 3.7-4.0 mm
- Impact Value KCU. 20°C: > 59 J/sm2
Mechanical properties of 15Ch12VNMF forgings for turbines and compressors (KP60 strength group):
- Re: > 590 MPa
- Rm: > 735 MPa
- A: > 15 %
- Z: > 35 %
- HB: 235-277
- KCU. 20°C: > 44 J/sm2
We deliver this steel alloy as:
- Forgings
- Rods
Replacements, equivalents and other designations:
15H12WMF, 15Ch12VNMF, 20Ch12VNMF, 15H11MF, 15C11MF, 1Ch11MF, 14Cr11MoV, 1Cr11MoV