Name: precipitation hardening stainless steel
Standard: AISI, ASTM
Model: 17-4 PH (631).
17-4 PH value on the basis of the development of 18-8 crni austenitic - martensitic precipitation hardening stainless steel, also known as the control of the phase change of stainless steel.17-4 PH stainless steel after solid solution treatment of unstable austenitic organization, has the good plastic toughness and processability, after adjustment, the precipitation austenitic composition of carbide phenology change, again through the martensitic transformation processing, most organizations for low-carbon tempering martensite good toughness and countries use steel, medium temperature mechanics performance is very good.17-4 acid and alkali corrosion resistance is superior to the general martensitic stainless steel.
17-4PH stainless steel Chemical composition:
|
C |
Mn |
Si |
Cr |
Ni |
P |
S |
Al |
|
≤0.09 |
≤1.00 |
≤1.00 |
16.0~18.0 |
6.5~7.75 |
≤0.04 |
≤0.03 |
0.75~1.5 |
17-4PH stainless steel are precipitation, water quenching, martensite stainless steel, high strength, hardness (up to 3000 c / 5000 c) and corrosion resistant properties.After heat treatment, the mechanical properties of the product to be more perfect, can reach 1100-1300 mpa pressure intensity of ksi (160-160).
17-4PH stainless steel corrosion resistance:
17-4 ph stainless steel corrosion resistance is superior to any other standard hardenable stainless steel.In most cases, its corrosion resistance were less than 304.If there is the risk of stress corrosion cracking, high curing temperature must be higher than 550 ℃ (1022 ° F), it is best to 590 ℃ (1094 ° F).Chloride medium best tempering temperature is 550 ℃ to 1022 ° F.H2S medium best tempering temperature is 590 ℃ to 1094 ° F.17-4 ph stainless steel in the static water easy suffer from pitting corrosion or cracks.It's in petroleum chemical industry, food processing and corrosion resistant ability of paper industry and 304 l grade.
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