ASTM A789 Duplex Stainless Steel Pipe, SMLS, OD 4-219 MM

Duplex Stainless Steel Seamless Pipe
Size: 4-219mm.
Thickness: 0.5-20mm.
Length: Single, Double Random & Cut Length.

Duplex Steel Welded Pipe
Size: 5.0-1219.2 mm.
Thickness: 0.5-20mm.
Length: Single, Double Random & Cut Length.

ASTM A789 Steel Pipe Specification
Duplex stainless steel pipe grades
Duplex 2205 Pipe
Duplex 2205 Tube
Super Duplex 2507 Pipe
Super Duplex 2507 Tube
ASTM A789 UNS 32520
ASTM A789 UNS 32900
ASTM A789 UNS 31260
   
Duplex stainless steel pipe

Duplex stainless steel is a stainless steel composed of any two phases of austenite, ferrite, and martensite in a proportion of about half. But it usually refers to austenitic-ferritic duplex stainless steel. It combines the characteristics of austenitic and ferritic stainless steel, with good comprehensive mechanical properties, high strength and high toughness; good resistance to crevice corrosion, pitting, and stress corrosion cracking; good resistance to uniform corrosion; good welding Performance, low thermal cracking tendency; high thermal conductivity, low linear expansion coefficient and other characteristics. It is widely used in the catalytic tube bundle of tubular reactor in methanol production; the tube bundle of sulfuric acid cooking and preheater in the pulp and paper industry; the oil and gas gathering pipeline of offshore and onshore oil; the condenser in the production of vinyl chloride; the desalination device of crude oil Heat exchanger tubes and other fields 

Advantages of Duplex
Duplex stainless steel has an array of various benefits such as:
Strength: Duplex stainless steels have approximately double the strength of regular austenitic or ferritic stainless steels.

Toughness and ductility: Duplex stainless steels exceed the toughness and ductility of ferritic grades although they are not as touch as austenitic grades.

Corrosion resistance: As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel, with chromium, molybdenum and nitrogen content being the most important. Duplex stainless steels are extremely corrosion resistant and even in chloride and sulphide environments, duplex stainless steels exhibit very high resistance to stress corrosion cracking (SCC). SCC is a type of corrosion that takes place when a particular set of factors are present: Tensile stress, corrosive environment and a sufficiently high temperature.

Heat Resistance: Duplex stainless steel has higher heat conductivity and lower thermal expansion than austenitic steels. Duplex grades can easily be used down to temperatures of at least -50°C because at low temperatures they have better ductility that ferritic grades of steel.

Cost: Duplex stainless steels have lower nickel and molybdenum contents than their austenitic counterparts. This lower alloying content means that duplex stainless steels can be lower in cost. Further to this, it is also possible that the thickness of duplex stainless steel can be reduced as it has an increased yield strength. Thinner products mean that significant weight savings can be made.

Weldability: Duplex stainless steels tend to have good weldability and all standard welding processes can be used although they are not quite as easily welded as the austenitic grades.