High-performance alloy material for industrial engineering and critical application conditions.
Scope of supply of Aviation Group:
Non-standard forgings, round rods, steel plates, rings, seamless pipes
1. Introduction to 0Cr15Ni7Mo2Al Materials
0Cr15Ni7Mo2Al is a precipitation hardening steel. It is developed by replacing 2% chromium in 0Cr17Ni7Al with 2%-3% molybdenum. After heat treatment, it gains higher hardness and better corrosion resistance. Its basic performance is similar to 0Cr17Ni7Al, while comprehensive performance is superior. Under austenite state, it supports various cold forming and welding processes, and maximum strength can be obtained after subsequent heat treatment.
2. 0Cr15Ni7Mo2Al chemical composition
| alloy | C | Mn | Si | P | S | Cr | Ni | Al | Mo |
| 0Cr15Ni7Mo2Al | – | – | – | – | – | 14.0 | 6.50 | 0.75 | 2.0 |
| 0.09 | 1.0 | 1.0 | 0.040 | 0.030 | 16.0 | 7.75 | 1.50 | 3.0 |
3. 0Cr15Ni7Mo2Al Physical Properties
| density | 7.85g/cm³ |
| Melting point | 1415-1450℃ |
| state | Tensile strength MPa | Yield Strength MPa | Elongation after breaking | Section shrinkage rate % | HB | HRC |
| Solid solution | – | – | – | – | ≤269 | ≤26 |
| 565℃ aging | ≥1210 | ≥1100 | ≥7 | ≥25 | ≥375 | ≥42 |
| 510℃ aging | ≥1320 | ≥1210 | ≥6 | ≥20 | ≥388 | ≥44 |
4. 0Cr15Ni7Mo2Al heat treatment
Three heat treatment systems are available based on State A: TH1050, RH950 and CH900.
State A
Solution treatment at 1050℃, followed by water cooling or air cooling; metallographic structure is austenite.
TH1050 State
After 1050℃ solution treatment, hold at 760℃±15℃ for 90 min, air cool, cool to 15℃ or ambient temperature within 1 hour, hold for 30 min, then heat to 565℃±10℃, hold and air cool (also named 565℃ aging). Metallographic structure: precipitation hardened martensite.
RH950 State
After 1050℃ solution treatment, hold at 955℃±15℃ for 10 min, air cool to room temperature, cool to -73℃±6℃ within 24h, hold for 8h, then heat to 510℃±6℃, hold 60 min and air cool (also named 510℃ aging). Metallographic structure: precipitation hardened martensite.
CH900 State
After 1050℃ solution treatment, perform 60% cold rolling deformation, heat to 490℃, hold 60 min and air cool to room temperature. Metallographic structure: precipitation hardened martensite.
5. 0Cr15Ni7Mo2Al performance
Processing performance covers cold & hot workability, heat treatment performance and welding performance.
0Cr15Ni7Mo2Al cold and hot processing performance
0Cr15Ni7Mo2Al stainless steel features austenite structure under solid solution state and supports cold working, yet it has high cold work hardening tendency. Thus cold rolling, cold stamping and other processes adopt few passes, heavy pressure and multiple intermediate solution treatments. Hot processing has low difficulty, suitable hot working temperature range: 950-1150℃.
0Cr15Ni7Mo2Al heat treatment performance
The heat treatment procedure of 0Cr15Ni7Mo2Al stainless steel is complex with strict parameter requirements. Target properties can only be achieved by precise control of temperature, holding time and cooling rate.
0Cr15Ni7Mo2Al welding performance
Welding methods are consistent with ordinary stainless steel, including arc welding, resistance welding and gas shielded welding (gas shielded welding performs best). Welding is usually carried out under material solid solution state. Preheating before welding is unnecessary, full heat treatment after welding is recommended. For welds requiring high strength, use 0Cr17Ni7Al welding wire with low delta ferrite content; for welds with low strength demand but high corrosion resistance demand, austenitic stainless steel welding wire is applicable.
6. 0Cr15Ni7Mo2Al application field
Used for brazed honeycomb panels, aircraft partitions, fasteners, aviation thin-wall structural parts, various containers, pipelines, springs, valve diaphragms, ship shafts, compressor plates, reactor components and multiple structural parts for chemical equipment.
