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Duplex Steel Pipes

Duplex Steel Pipes
Duplex Steel Pipes
Product Code : 50
Product Description

Backed by rich industrial experience, we are able to manufacture, export and supply our clients an excellent quality array of  Duplex Steel Pipes. Extensively used in oil & gas industry and steam boilers, the pipes offered by us are precisely manufactured by our team of diligent professionals using quality approved steel and progressive techniques in conformity with set international standards. Apart from this, offered Duplex Steel Pipes are made available at pocket friendly prices to our valuable clients within the promised time period.

Features:

  • High strength

  • Easy installation

  • Accurate dimensions

  • Corrosion resistance

DUPLEX STEEL PIPE & TUBES:

  • DUPLEX 2205

  • ASTM A 182, A 240, A 276, A 789, A 790, A 815, UNS S31803, S32205, NACE MR0175

2205 Duplex Overview

Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. “Duplex” describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. The structure of 2205 duplex stainless steel consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 2205 contains approximately 40-50% ferrite. Often referred to as the work horse grade, 2205 is the most widely used grade in the duplex family of stainless steels.

The advantage of a duplex structure is that it combines the favorable qualities of a ferritic alloy (stress corrosion cracking resistance and high strength) with those of an austenitic alloy (ease of fabrication and corrosion resistance).

Usage of 2205 Duplex stainless steel should be limited to temperatures below 600° F.  Extended elevated temperature exposure can embrittle 2205 stainless.

Corrosion Resistance

2205 duplex stainless steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. Increasing temperatures also increase the susceptibility of stainless steels to stress corrosion cracking.

The combination of chromium, molybdenum and nitrogen convey the good resistance of 2205 to chloride pitting and crevice corrosion. This resistance is extremely important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 provide corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.

Chemical Composition, %

Cr

Ni

Mo

C

N

22.0-23.0

4.50-6.50

3.00-3.50

.030 Max

0.14-0.20

Mn

Si

P

S

Fe

2.00 Max

1.00 Max

.030 Max

.020 Max

Balance

In what applications is Duplex 2205 used?

  • Chemical process vessels, piping and heat exchangers

  • Pulp mill digesters, bleach washers, chip pre-steaming vessels

  • Food processing equipment

  • Oil field piping and heat exchangers

  • Flue gas desulfurization equipment

ASTM Specifications

Pipe Smls

Pipe Welded

Tube Smls

Tube Welded

Sheet/Plate

Bar

Flanges, Fittings & Valves

A790

A790

A789

A789

A240

A276

A182

Mechanical Properties
Specified Tensile Properties ASTM A240


Ultimate Tensile Strength, ksi Minimum

.2% Yield Strength, ksi Minimum

Hardness Max.

95

65

31 Rockwell C