Overview
UNS S32205 duplex stainless steel is composed of 22% chromium,3%
molybdenum and 5-6% nickel nitrogen duplex stainless steel. It has high strength, good impact toughness and good overall and
local resistance to stress corrosion. Compared with 316L and 317L austenitic stainless steel,UNS S32205
alloy in the resistance to point corrosion and gap corrosion
performance is better, it has a high corrosion resistance, compared
with austenite, its coefficient of thermal expansion is lower,
higher thermal conductivity. The yield strength of UNS S32205 is twice that of austenitic
stainless steel, which allows designers to reduce weight when
designing products, giving this alloy a price advantage over
316,317L. This alloy is particularly suitable for the -50°F/+600°F
temperature range At the same time, it has also become an important engineering
material, which is widely used in petrochemical industry, offshore
and coastal facilities, oilfield equipment, paper making,
shipbuilding environmental protection and other fields.
Corrosion Resistance
1.Due to its high chromium, molybdenum, and nitrogen content,
Duplex 2205 demonstrates superior corrosion resistant properties to
316 and 316L in most environments.
2.Chromium, molybdenum, and nitrogen content also provide high
resistance to pitting and crevice corrosion, even in oxidizing and
acidic solutions.
3.Resistant to chloride stress corrosion cracking and temperatures
of up to about 302°F (150°C).
4.The presence of ferrite provides for good performance of Duplex
2205 in caustic environments.
UNS S32205 stainless steel pipe advantages
1.Good weldability.
2.Excellent low temperature toughness.
3.Good corrosion resistance.
4.Excellent mechanial properties.
5.Good heat treatment specifications.
6.High wear resistance and fatigue strength.
7.Low notch sensitivity and tendency to temper brittleness.
8.High polishing properties and surface gloss.
9.Excellent welding performance.
Heat Resistance
Similar to other duplex stainless steels, Duplex 2205 has good
oxidation resistance at high temperatures.
Subject to embrittlement when exposed to temperatures above 572°F
(300°C) even when exposed for short periods of time; Duplex 2205 is
therefore not recommended for use above 572°F (300°C).
UNS S32205 stainless steel pipe Usage
(1) Pressure vessels, high-pressure storage tanks, high-pressure
pipelines, heat exchangers (chemical processing industry).
(2) Oil and gas pipelines, heat exchangers pipe fittings.
(3) Sewage treatment system.
(4) Pulp and paper industry classifiers, bleaching equipment,
storage and treatment systems.
(5) Rotary shaft, press roller, blade, impeller, etc., in
high-strength corrosion-resistant environment.
(6) Cargo boxes for ships or trucks.
⑺ Food processing equipment.
Chemical Composition Of UNS S32205 Duplex Steel
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | N |
| 2205 | 0.03% | 1.00% | 2.00% | 0.030% | 0.020% | 4.5～6.5% | 22.00～23.00% | 3.00～3.50% | 0.14～0.20% |
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