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Material Data Sheet

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317AP

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Main Features

• Excellent naphthenic acid and polythionic acid corrosion resistances without PWHT and thermal stabilization.

• Better phase stability at high temperature as compared with type317L

• Equivalent mechanical property to type317L

• High Mo bearing Ni-based welding consumable such as 617 or 625 filler are available


Standard

• Not registered in ASTM/ASME standard.

• If NSSMCTM317AP will be approved in ASTM/ASME CC, MDS will be updated.


Chemical Composition


Properties

Target of Development

Fig. Target of Development for NSSMCTM 317AP

 

Propeties

Tensile properties

Fig. High Temperature Tensile Properties of NSSMCTM 317AP

Tensile property of NSSMCTM 317AP at elevated temperature is equivalent to that of type 317L.

 

Corrosion Resistance

(a) Naphthenic acid corrosion resistance

Fig. Naphthenic acid corrosion resistance of NSSMCTM 317AP and welded joint

Naphthenic Acid Corrosion Resistance of NSSMCTM 317AP is equivalent to that of Type 317L.

 

(b) Polythionic acid SCC resistance

Fig. Polythionic Acid SCC Resistance of NSSMCTM 317AP and welded joint

Polythionic Acid SCC Resistance of NSSMCTM 317AP is much better than that of Type 317L without PWHT and thermal stabilization.