17-7Ph is a type of Austenitic-Martensite precipitation hardened stainless steel developed base on 18-8CrN，that’s 631 stainless steel. After solid solution treatment, stainless steel 17-7ph will become unstable Austenite tissue, then cooling to precipitate carbide, and then Martensite transformation will be conducted. Most of the tissues will be transformed into low-carbon tempered Martensite with better toughness. The corrosion resistance of 17-7PH is better than that of ordinary Martensitic stainless steel.
17-7PH is characterized by high strength and hardness, excellent fatigue properties, good corrosion resistance and minimum distortion on heat treatment after heat treatment. The molding properties and elasticity of annealed 17-7PH are similar to 301. Under heat treatment conditions of TH1050 and RH950, the corrosion resistance of 631 is better than that of ordinary hardened stainless steels (such as 410, 420 and 431), but not as good as 304. After heat treatment, the corrosion resistance of CH900 is similar to 304 in most environments.
Available forms and specifications
AMS 5568 Welded Tubing
AMS 5528 Sheet, Strip and Plate
AMS 5529 Sheet, Strip Cold Rolled
AMS 5644 Bars and Forgings (Cap. ASTM A 564 Type 631)
AMS 5678 Wire
AMS 5824 Welding Wire
ASTM A 693, ASTM A 313, ASTM A 564, ASTM A 579 and ASTM A 705
ASME SA 564, SA 693 and SA 705
Tensile strength, min, Mpa
Yield strength, 0.2% offset, min, Mpa
Hardness Rockwell C
Chemical processing equipment
Oil and petroleum refining equipment
Food processing equipment
LKALLOY is an industry leading manufacturer and supplier of 17-7Ph and other high-quality stainless steel alloys. We stock 17-7Ph stainless steel in the form of sheet, plate, bar,tubing and strip which are used for several applications such as springs, washers, blades, pressings, flexures, encapsulated bellows and etc.
Room 2509, Block A, ITL Building, Gangwu Road, Xi’an, China