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  • Duplex Pipes

Name:Duplex Pipes
Specificaiton:ASME B36.19
Size::1/8" to 120"
SCH:SCH10 through SCHXXS
Steel Grade::UNS S31803, S32205
MOQ::100 KGS
Ends:PE OR BE
Delivery term:FOB, CNF, CIF and EXW
Payment Term:TT or LC At sight
Loading Port:XINGANG
Deliver mode:By Sea, By Air and By Land
Packing:Standard seaworthy/airworthy packing
Standard:ANSI, JIS, BS, EN, DIN

Product Description

Seamless & Welded Duplex Stainless Steel Pipes 

ASTM A790/ASTM A928 UNS S31803, UNS S32205

Hebei Zhongji is A Global Leading Supplier For Your ASTM A790 Duplex Stainless Steel Pipes Needs.

Advantages of duplex steel

Duplex stainless steel has many advantages, such as:
  • Strength: The strength of duplex stainless steel is about twice that of ordinary austenitic or ferritic stainless steel.
  • Toughness and ductility: Although duplex stainless steel is not as good as austenitic grade, its toughness and ductility exceed ferritic steel.
  • Corrosion resistance: Like all stainless steels, corrosion resistance mainly depends on the composition of the stainless steel, of which chromium, molybdenum and nitrogen content are the most important. Duplex stainless steel has strong corrosion resistance, even in chloride and sulfide environments, duplex stainless steel has high stress corrosion cracking resistance (SCC). SCC is a type of corrosion that occurs when the following specific factors are present: tensile stress, corrosive environment and sufficiently high temperature.
  • Heat resistance: Duplex stainless steel has higher thermal conductivity and lower thermal expansion than austenitic steel. Duplex stainless steels can be easily used at temperatures of at least -50°C because they are more ductile than ferritic stainless steels at low temperatures.
  • Cost: The nickel and molybdenum content of duplex stainless steel is lower than that of austenitic stainless steel. The lower alloy content means that duplex stainless steel can reduce costs. In addition, due to the increased yield strength of duplex stainless steel, its thickness can also be reduced. Thinner products mean that weight can be greatly reduced.
  • Weldability: Duplex stainless steels tend to have good weldability. Although they are not as easy to weld as austenitic stainless steels, all standard welding processes can be used.

Duplex Pipe Schedule Chart  

Duplex Pipe Chemical Composition

C

Mn

Si

P

S

Cr

Mo

Ni

N

S31803

0.03

2

1

0.03

0.02

min: 21.0

min: 2.5

min: 4.5

min: 0.08

max

max

max

max

max

max: 23.0

max: 3.5

max: 6.5

max: 0.20

S32205

0.03

2

1

0.03

0.02

min: 22.0

min: 3.0

min: 4.5

min: 0.14

max

max

max

max

max

max: 23.0

max: 3.5

max: 6.5

max: 0.20

Duplex Pipe Properties

Grade

Tensile Strength

Yield Strength

Elongation %

Hardness (HB) MAX

ksi (min)

0.2% ksi (min)

S31803/S32205

90

65

25

217

Duplex Pipe Dimensions

Duplex Pipe Grade

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UNS #

S31200

S31803

S32205

S32550

S32750

S32760

Seamless & Welded Pipe

A/SA790

A/SA790

A/SA790

A/SA790

A/SA790

A/SA790

(without Filler Metal)

Welded Pipe

A928

A928

A928

A928

A928

A928

(with Filler Metal)

Seamless & Welded General Service Tubing
(without Filler Metal)

A/SA789

A/SA789

A/SA789