EU 3.2 Certification S32205 Duplex Stainless Steel Tube for Chemical Process Vessels

Duplex stainless steel has developed into the third generation since its birth in the United States in the 1940s. Its main feature is that its yield strength can reach 400-550 MPa, which is twice that of ordinary stainless steel, thus saving materials and reducing equipment manufacturing costs. In terms of corrosion resistance, especially under the condition of relatively poor medium environment (such as seawater, high chloride ion content), the dual phase stainless steel has significantly better resistance to pitting, Crevice corrosion, stress corrosion and Corrosion fatigue than ordinary austenitic stainless steel, and can be comparable to high alloy austenitic stainless steel. It has excellent mechanical properties and welding performance in the range of -50~280 oC.
 

1.1 Composition characteristics
The second generation duplex stainless steel is generally referred to as standard duplex stainless steel, characterized by ultra-low carbon and nitrogen content, with a typical composition of 22% Cr+5% Ni+0.17% N. Compared with the first generation duplex stainless steel, S2205 further increases nitrogen content and enhances stress corrosion and pitting resistance in acidic media with high chloride ion concentration. Nitrogen is a strong austenite forming element that can be added to duplex stainless steel to improve its strength without significantly damaging its plasticity and toughness, while also inhibiting carbide precipitation and delaying its formation σ Phase formation.
 

1.2 Organizational characteristics
The austenite and ferrite in the Solid solution of the duplex stainless steel at room temperature account for about half respectively (the ferrite content of the duplex stainless steel 2205 should be 30%~55%, and the typical value is about 45%), which has both two-phase structure characteristics, as shown in Figure 1. From the figure, it can be observed that the volume of austenite (white) and ferrite structure (black) are similar, and the two phases are alternately distributed in bands along the rolling direction of the steel pipe.
Duplex stainless steel 2205 retains the characteristics of high thermal conductivity, low linear expansion coefficient, resistance to pitting corrosion, crevice and chloride stress corrosion of ferritic stainless steel; It also has the advantages of good toughness, low brittle transition temperature, resistance to intergranular corrosion, good mechanical properties, and welding performance of austenitic stainless steel.

Chemical Composition

Mechanical Properties

Physical Properties

Product Photography

Company Profile

Zhongzheng Stainless Steel Co., Ltd. was established in 2018 with aregistered capital of 20 million yuan. lt is a manufacturing company thatintegrates the production of special materials, manufacturing andprocessing, sales, and technology development. The company covers anarea of 2,000 square meters and has 200 employees. it has built worldclass stainless steel seamless pipe (hot piercing, cold drawing, cold rollingproduction lines, precision steel pipe production lines, and large, mediumand small-sized welded pipe production lines. The company has beencommitted to providing high performance, high precision, hightemperature-resistant, high pressure-resistant, and corrosion-resistantsolutions and technical services for industrial equipment pipeline systems.The company specializes in producing a series of steel pipes, pipe fittingsflanges, etc., such as high-temperature (nickel-based) alloys, austeniticduplex steel, urea grade stainless steel, super stainless steel, etc. Thecompany is equipped with an annual production capacity of 5,000 tons ofstainless steel seamless pipe production line, 7,000 tons of welded pipeproduction line, and 500 tons of pipe fittings production line, etc. lt canoroduce stainless steel seamless pipes with diameters ranging from ?Φ?6 to?Φ?762 and wall thicknesses ranging from 0.5 to 70 mm, stainless steelwelded pipes with diameters ranging from ?Φ?15 to ?Φ?2200 and wallthicknesses ranging from 0.5 to 80 mm, pipe fittings, and various stainlesssteel ingots, round steel, rough pipes, etc., according to customerrequirements and in accordance with standards such as GB, ASTM, etc.

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