AISI SS 347 / 347H Pipe Fittings,Flanges & Fastener

Stainless steel 347 is a stabilized alloy whose specialty is the exceptional resistance to intergranular corrosion. Apart from that, it holds great level of strength and therefore can be used under high temperatures ranging from 800 to 1500° F (i.e. 427 to 816° C) in the chromium carbide precipitation. The reason behind the stabilization of this alloy plate is the addition of columbium and tantalum. Alloy 347 plates can only be hardened by cold working and not by heat treatment. It is feasible for welding and can be processed by standard shop fabrication.
Stainless steel 347H is the higher carbon version of the alloy 347, i.e. “H” grade. It is designed to gain higher creep resistance and it can bear higher temperatures up to 1000° F (537° C). Mostly, the carbon content present in this alloy causes dual certification.
What are the uses of SS 347 and SS 347H?
• Chemical industries
• Food processing units
• Petroleum refining industries
• Pharmaceutical production
• Waste heat recovery

Standards

Summary	Standards
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings	ASTM A 403
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service	ASTM A 182

Mechanical Properties – Pipe Fittings

Tensile Strength : Unit – ksi (MPa) , Minimum
Yeild Strength : 0.2 % Offset , Unit – ksi (MPa) , Minimum
Elongation : in 2?, Unit : % , MinimumValues as per ASTM B 403

Condition & Grade	Tensile Strength	Yeild Strength	Elognation Longitudinal	Elognation Transverse
Annealed Tp 347 / 347H	75 (515)	30 (205)	28	20

Mechanical Properties – Flanges

Tensile Strength : Unit – ksi (MPa) , Minimum
Yeild Strength : 0.2 % Offset , Unit – ksi (MPa) , Minimum
Elongation : in 2?, Unit : % , Minimum
Reduction of Area : Unit : % , MinimumValues as per ASTM B 182