13-8 is a martensitic precipitation hardening stainless steel, with excellent strength, high strength, superior toughness and corrosion resistance. Good cross-sectional toughness formation is due to tight chemical composition, low carbon and vacuum smelting. Typical applications in giant body parts and molded parts.
13-8Mo has a good processing performance, but also in a lower temperature to do a heat treatment can be aging hardening. Aging in front of the cold work can also improve the aging effect.
Application
13-8Mo can be used to manufacture valve parts, fittings, cold extrusion and machine fasteners, shafts, landing gear parts, latches, stop washers, aircraft parts, nuclear reactor parts and petrochemical equipment parts. These applications need to face stress corrosion cracking. In general, the alloy is suitable for applications requiring high strength, toughness, corrosion resistance, stress-resistant corrosion cracking, and requires minimal directivity in stainless steel applications.
13-8Mo Antioxidant temperature up to 539 ° C. Precipitation hardened stainless steel for extended exposure to prolonged temperatures can result in reduced toughness. In some cases, a higher aging temperature can reduce the toughness in the heating environment. If the maximum temperature is at least 28 ° C lower than the aging temperature, short exposure is possible.
chemical component%
| C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
| 0.05 |
0.1 |
0.1 |
0.035 |
1 |
12.25~13.35 |
2~2.5 |
7.5~8.5 |
Corrosion resistance
13-8Mo H950 state of 5% (mass) salt spray corrosion resistance and 304 stainless steel similar. In strong oxidizing and strongly reducing acids, the corrosion resistance of 13-8Mo is close to 304. And other precipitation hardening of stainless steel, 13-8Mo completely hardened state of the strongest corrosion resistance, and the higher the aging temperature, corrosion resistance will be reduced.
A large number of experiments show that 13-8Mo forging state and welding state in the sea environment on the stress corrosion cracking has a good resistance. To achieve the best stress corrosion cracking resistance, the aging temperature is at least 538 ° C.
Stress Corrosion Cracking Tolerance in Maritime Gas Environment
Heat treatment
The material in the solution annealed state is heated to 510-1150 ° C, heated for 4 hours, and then air cooled to harden the material.
Solution treatment
State A (solid state or annealed state)
Heated to 927 ° C +/- 8 ° C, the heating time depends on the cross-sectional area and then cooled to below 16 ° C, the material is fully converted to martensite. Usually the holding time at the temperature point is 1 hour. Cross-sectional area less than 232.3cm2 The choice of appropriate liquid for quenching, large cross-sectional area of the material should be air-cooled.
Hardening deformation
13-8Mo aging treatment will change the size. The higher the aging temperature, the greater the shrinkage
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