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  • Duplex & Suplex Dupex Stainless Steel Buttweld Pipe Fittings

Name:Duplex & Suplex Dupex Stainless Steel Buttweld Pipe Fittings
Specificaiton:ASTM A815
Size::1/2" to 120"
SCH:SCH10 through SCHXXS
Steel Grade::UNS S31803, S32205, S32750, S32760
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

Duplex & Super Duplex Stainless Steel Buttweld Pipe Fittings

ASTM A815 UNS S31803, S32205, S32750, S32760 Duplex & Super Duplex Steel Pipe Fittings

Hebei Zhongji Is A Global Leading Manufacturer For Your ASTM A815 Duplex Stainless Steel Pipe Fittings Needs.

Duplex Steel

Duplex stainless steel is a very useful metal that has been used worldwide. It gets its name because it contains two different grades of metals.

In essence, Duplex is a Fe-Ni-Cr alloy with a two-phase ferritic-austenitic stainless steel structure at room temperature.

Duplex steel is characterized by high chromium content (19-28%) and molybdenum (maximum 5%), and the nickel content is lower than that of austenitic stainless steel. The most commonly used duplex stainless steels are 2205 (22% chromium, 5% nickel) and 2507 (25% chromium, 7% nickel). 2507 is called "super duplex steel" because of its higher corrosion resistance.

The advantage of combining ferrite and austenite grades is that the resulting metal has a metallurgical structure composed of two phases and therefore benefits from the characteristics of both microstructures.

These characteristics make duplex steel highly sought after in heavy industries such as oil and gas nuclear and chemical processing.

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.

Application of duplex steel

The wide range of advantages of duplex stainless steel means that it can be used in many different fields. They are used for:

  • Chemical processing, transportation and storage
  • Pipelines for oil and gas production and transportation
  • Oil and gas exploration and offshore drilling platforms
  • Oil and gas refining
  • The marine environment
  • Pollution control equipment
  • Pulp and Paper
  • Chemical processing plant
  • Structure and mechanical components
  • Heat Exchanger
  • Cooling pipe

Duplex 2205 Buttweld Fittings 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 2205 Buttweld Fittings Machanical Properties

Grade

Tensile Strength

Yield Strength

Elongation %

Hardness (HB) MAX

ksi (min)

0.2% ksi (min)

S31803/S32205

90

65

25

217

Duplex & Super Duplex Buttweld Fittings Grade

Trade Name

DUPLEX

DUPLEX

2205 DUPLEX

SUPER DUPLEX FERRALIUM 225

SUPER DUPLEX 2507

SUPER DUPLEX ZERON 100

UNS #

S31200

S31803

S32205

S32550

S32750

S32760

Buttweld Fittings

-----

A/SA815

A/SA815

A/SA815

A/SA815

A/SA815


 

 

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