ASTM A790 standard technical specification covers seamless and welded ferritic/austenitic stainless steel nominal pipes.
GNEE supplies ASTM A790 stainless steel pipes with outer diameters ranging from 20 to 762 mm and wall thicknesses from 2.0 to 120 mm. Common product grades include UNS S31260, UNS S31500, UNS S31803, UNS S32101, UNS S32205, and UNS S32304. Manufacturing methods include cold rolling, cold drawing, hot rolling, and welding, and the delivery condition is typically heat treated and pickled.

The SA 790 UNS S31803 pipes we supply offer excellent corrosion resistance in seawater and other chloride-rich environments. This resistance to chloride stress corrosion cracking makes it one of the most cost-effective solutions in the long run. Duplex stainless steel 31803 seamless pipes are used in applications requiring extremely high precision. However, seamless pipes have lower strength compared to duplex stainless steel UNS S31803 welded pipes.
Furthermore, A790 gr S31803 DSS ERW pipes are used in applications including seawater and marine environments, chemical industries, food processing plants, thermal power generators, automotive parts, boiler components, and other high-temperature applications. Electrically fused welded duplex stainless steel S31803 UNS EFW pipes can also be used in less demanding applications.

Duplex stainless steel 31803 seamless pipes

SA 790 UNS S31803 pipe

Specifications

Item	Stainless Steel Seamless Tube/Pipe
Standard	ASTM A790
Material	Duplex and Super Duplex Steel: S31803, S32205, S2520, S32750, S32760
Surface	Polishing,annealing,pickling,bright
Shape	Round Pipe/Tube
Type	Cold rolled
size	Length	6m or Customized
	Outer diameter	OD: 12.7mm~630mm WT: 1mm~50mm
Delivery time	Prompt delivery or as the order quantity.
Package	Standard export seaworthy package,or as required

Chemical Composition:

Grade

max

UNS S32750

0.030

0.8

1.2

0.030

0.015

24.0-26.0

6.0-8.0

3.0-5.0

0.24-0.32

UNS S31803

0.030

1.0

2.0

0.020

21.0-23.0

4.5-6.5

2.5-3.5

0.08-0.20

Physical Properties:

Grade	Y.S.MPa min	T.S.Mpa min	Elongation %	Hardness HRC
UNS S32750	550	800	15	20
UNS S31803	450	620	25	20

Duplex Stainless Steel Pipe Application:

Chemical processing, Transport and Storage.

Oil and gas exploration and offshore rigs.

Oil and gas refining.

Marine environments.

Pollution control equipment.

Pulp and paper manufacturing

Chemical process Plant

1.4462 Duplex Stainless Steel Pipe Application

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Testing and Inspection

GNEE has advanced production equipment, including 113 advanced automatic gas shielded welded pipe production lines, 10 medium frequency online bright insulation annealing machines, 30 high-speed internal leveling machines, and a planned annual production capacity of 30,000 tons. The production range: round pipe specifications are 12.7mm-323mm, thickness 0.5-12.7mm, square pipe 10x10mm-250x250mm; production thickness 0.5-10mm.

Highest quality packaging and shipping

Packaging:
Tubes must be packed safely in strong wooden boxes or wooden bundles with:
.Plastic caps
.Moisture protection (VCl)
.Internal separators
Straps

Duplex Stainless Steel 2205 High Pressure Tubes