1: Brief Introduction Of 17-7PH stainless steel
Stainless Grade 17-7 PH is a precipitation hardening stainless steel that provides high strength and hardness, excellent
fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment. The alloy
provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides
benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat
springs at temperatures up to 600°F (316°C).
Corrosion Resistance:
Corrosion resistance of Type 17-7PH stainless steel in all heat treated conditions, like other types of stainless steels - will
develop superficial rust in some environments. For example, in a marine atmosphere, stainless steels show evidence of
rusting after relatively short exposure periods. However, after exposure of one or two years, the amount of rust present is
little more than that present at six months. As with all martensitic steels, 17-7PH stainless steel may be subject to cracking
when exposed under stress in environments containing hydrogen sulfide. Such applications are not recommended.
Formability:
In Condition A, the alloy can be formed comparably to Type 301. It work hardens rapidly and may require intermediate
annealing in deep drawing or in forming intricate parts. Springback is similar to that of Type 301. This alloy is extremely
hard and strong in Condition C. Therefore, fabrication techniques for such material must be used.
Weldability:
The precipitation hardening class of stainless steel is generally considered to be weldable by the common fusion and
resistance techniques. Special consideration is required to achieve optimum mechanical properties by considering the
best heat-treated conditions in which to weld and which heat treatments should follow welding. This particular alloy is
generally considered to have poorer weldability compared to the most common alloy of this stainless class, 17-4 PH stainless
steel. A major difference is the high Al content of this alloy, which degrades penetration and enhances weld slag formation
during arc welding. Also, the austenite conditioning and precipitation hardening heat treatments are both required after
welding to achieve high strength levels. When a weld filler is needed, 17-7 PH is most often specified.
Other Grades:
201,202,21-4N,301,302,301L,303,303Se,304,304L,304H,304LN,304N,305,S38400,308,309,309S,310,310s,
316,316L,316H,316Ti,316N,316LN,317,317L,317LMN,317LN,321,321H,347,347H,S3100,S31803,S3205,
S32304,S31200,S31260,S32507,405,409,429,430,430F,434,444,403,410S,410,416,420,420F,431F,440A
440B,440C,440F,610,630,631,632,635,660,Alloy 200,Monel 400 ,Alloy K-500 ,Inconel 600 , Incconel 601,
Inconel 625 , Inconel 718 , Alloy 800 ,Alloy 800H,Alloy 800HT,Inconel 825,Alloy 276, Alloy 20, Alloy 59
Chemical Properties:
| TYPE |
Cr |
Ni |
Al |
C |
Mn |
P |
S |
Si |
| 17-7PH |
16.0-18.0 |
6.75-7.75 |
0.75-1.5 |
0.09 max |
1.0 max |
0.05 max |
0.03 max |
1.0 max |
2: Stainless Steel Plate Process
3: Stainless Steel Plate Package
4: Company Introduction
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