(Super) duplex stainless steel tubes mainly used in the waters of the environment, petrochemical industry, chemical fertilizer industry, oil refining industry, oil and gas industry, light industry and food industry, pulp and paper industry, energy and environmental protection industries.

Main standard:

GB/T 21832 austenite grain size-iron duplex stainless steel welded tube
GB/T 21833 austenite grain size-iron duplex steel stainless steel seamless steel tube
ASTM A789 (ASME SA789) general purpose seamless and welding ferritic/austenitic stainless steel pipe
ASTM A790 (ASME SA790) seamless and welding ferritic/austenitic stainless steel nominal pipe
ASTM A928 stuffed electric welding metal ferrite/austenite (dual) stainless steel pipe standards

UNS S31803 Duplex Stainless Steel Pipe

1.Standard: ASME, ASTM

2.Place of Origin: China (Mainland)

3.Brand Name: Sunny Steel

4.Delivery Conditions: Annealed and Pickled; Polished

5.Shape: Round & Square

6.Certificates: PED / AD2000 W0 / DNV

7.Material: UNS S31803

8.Standards: ASTM A789, ASTM A790

9.Application:
a. Petrochemical industrial pipe
b. Pipe pharmaceutical industry
c. Food industry management
d. Aerospace tube
e. Boiler heat exchange tube
f. Pipe construction and decoration industries
g. Automation and other industrial pipe

10.Dimensions:
O.D.: Min 1/8"NB SCH10S, SCH40S, SCH80S, SCH160, SCH XXS
O.D. Max 8"NB SCH10S, 40S, SCH80S

11.Payment Terms: T/T, L/C

12.Minimum Order Quantity: Negotiable

13.Load Port: Shanghai China

14.Packaging Details: Plywood boxes; Plastic bags

15.Delivery Time: 30 days

16.Supply Ability: 150 Tons per Month

Duplex Applications

Chemical processing, transport and storage,
Oil and Gas exploration and processing equipment,
Marine and other high chloride environments,
Pulp and paper digesters, liquor tanks and paper machines.

Duplex Corrosion Resistance

Excellent general corrosion resistance; superior to Grade 316 in most environments. Excellent resistance to localized corrosion including intergranular, pitting and crevice corrosion; the CPT of 2205 is generally at least 35ºC. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150ºC. Grade 2205 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water then Grade 316.

Duplex Heat Resistance

Although 2205 has good high temperature oxidation resistance, this grade - like other duplex stainless steels - suffers from embrittlement if held for even short times at temperatures above 300ºC. If embrittled, this can only be rectified by a full solution annealing treatment. Duplex stainless steels are almost never used above 300ºC.

Duplex Heat Treatment

Solution treatment (annealing) - heat to 1020ºC-1100ºC and cool rapidly. This grade cannot be hardened by thermal treatment, but does work harden.