ASTM A790 S31803 Duplex Steel Pipe and tube/ Seamless and Welded

Description of Super Duplex Stainless Steel:

Super Duplex Stainless Steel is a highly alloyed, good performance duplex steel with a pitting resistance. Super duplex offers good resistance to pitting and crevice corrosion.Super duplex is suited for use in aggressive environments. It has good resistance to stress corrosion cracking in chloride and sour environments and has good resistance to erosion corrosion and corrosion fatigue.

Application:

Oil and gas industry equipment.

Offshore platforms, heat exchangers, process and service water systems, fire - fighting systems, injection and ballast water system.

Chemical process industries, heat exchangers, vessels, and piping.

Desalination plants, high pressure RO - plant and seawater piping.

Mechanical and structural components, high strength, corrosion - resistant parts.

power industry FGD systems, utility and idustrial scrubber systems, absorber towers, ducting, and piping.

Chemical composition%

C	Cr	Ni	Mo	N	Others
0.020	25	7	4.0	27	S=0.001
Pren= (Cr%)+3.3 (Mo%)+16 (N%) not less than 40

Mechanical Performance:

Ultimate Tensile Strength, Ksi	116min
0.2%Offset Yield Strength 0.2%, Ksi	80min
0.1%Offset Yield Strength 0.2%, Ksi	91min
Elongation in 2 inches, %	15 min
Hardness Rockwell C	32 max
Impact Energy, ft. - lbs.	74min

Low Temperature Impact Properties:

Temperature 0F	RT	34	- 4	- 40
Ft - lbs	162	162	155	140
Temperature 0F	- 76	- 112	- 148	- 320
Ft - lbs	110	44	30	7

Elevated temperature Tensile Properties:

Temperature 0F	68	212	302	392	482
0.2%Offset Yield Strength, Ksi	80	65	61	58	55
Ultimate Tensile Strength, Ksi	116	101	98	95	94

Processing:

Hot forming

2507 should be hot worked between 1875⁰F and 2250⁰F. This should be followed by a solution anneal at 1925⁰F minimum and a rapid air or water quench.

Cold Forming:

Most of the common stainless steel forming methods can be used for cold working 2507. The alloy has a higher yield strength and lower ductility than the austentic steels so fabricators may find that higher forming forces, increased radius of bending and increased allowance for springback are necessary. Deep Drawing, stretch forming and similar processes are more difficult to perform on 2507 than on an austenitic stainless steel. When forming requires more than 10% cold deformation, a solution anneal and quench are recommended.

Heat Treatment:

2507 should be solution annealed and quenched after hot or cold forming solution annealing should be done at a minimum of 1925⁰F. (1025 - 1125 centigrade) Annealing should be followed immediately by a rapid air or water quench to obtain maximum corrosion resistance, heat treated products should be pickled and rinsed.

Welding:

2507 possesses good weldability and can be joined to itself or other materials by shielded metal arc welding, gas tungsten arc welding, plasma arc welding, flux cored wire or submerged arc welding. 2507/P100 filler metal is suggested when welding 2507 because it will produce the appropriate duplex weld structure.

 

 

 

 

 

 

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