17-4PH stainless steel is a martensitic precipitation hardening stainless steel, equivalent to the Chinese brand: 0Cr17Ni4Cu4Nb. 17-4PH precipitation hardening steel with copper added. 17-4PH is used to manufacture shafts and steam turbine parts.
Heat treatment specifications:
1. Rapid cooling at 1020～1060℃ for a solution
2. Ageing at 480℃, after solution treatment, air cooling at 470～490℃
3. Ageing at 550℃, after solution treatment, air cooling at 540～560℃
4. Ageing at 580℃, after solution treatment, air cooling at 570～590℃
5. Ageing at 620℃, after solution treatment, air cooling at 610～630℃
The main characteristics of 17-4PH stainless steel:
Corrosion resistance
The corrosion resistance of 17-4 PH stainless steel powder metallurgy alloy is better than any other standard hardenable stainless steel. In most cases, its corrosion resistance is no less than 304.
If there is a risk of stress corrosion cracking, the higher curing temperature must be higher than 550ºC (1022ºF), preferably 590ºC (1094ºF), and the best tempering temperature in the chloride medium is 550ºC-1022ºF.
This alloy is susceptible to corrosion or cracks corrosion in stagnant seawater. Its corrosion resistance in the petrochemical industry, food processing and paper industry is the same as 304L stainless steel powder grade.
Welding performance
Any method can be used for welding in the state of reliable solution, ageing or over ageing. There is no need to preheat before welding. If the weld strength is required to be close to the power of the steel after ageing hardening, it must be re-solutionized and ageing treated after welding. The steel is also suitable for brazing, and the best brazing temperature is the solution treatment temperature.
Application fields of 17-4PH stainless steel
Offshore platforms, helicopter decks, other platforms, food industry, pulp and paper industry, aerospace (turbine blades), mechanical parts, nuclear waste barrels.
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