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Duplex stainless steel with pitting corrosion resistance and favourable cold temperature flexibility and manufacturing method thereof

A technology of duplex stainless steel and low temperature toughness, which is applied in the field of duplex stainless steel and its manufacturing to achieve excellent pitting corrosion resistance, reduce adverse effects and improve corrosion resistance.

Inactive Publication Date: 2010-03-31
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, the effect of manganese on the corrosion resistance of stainless steel is basically negative

Method used

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  • Duplex stainless steel with pitting corrosion resistance and favourable cold temperature flexibility and manufacturing method thereof
  • Duplex stainless steel with pitting corrosion resistance and favourable cold temperature flexibility and manufacturing method thereof

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Embodiment 1

[0039] The alloy metallographic diagram of embodiment 1 is as figure 1 Shown (austenite phase accounts for about 50%), the rule that the impact value of the alloy of embodiment 2 changes with temperature is as follows figure 2 shown. Table 2 shows the mechanical properties and corrosion properties of the steels of the present invention and comparative steels, as well as the results of edge cracks during hot working. Among them, the phase ratio of duplex stainless steel adopts quantitative metallographic method, and the sample is electrolytically corroded, and the corrosion agent is 40g KOH+100ml H 2 O, corrosion current 0.3~0.8A / cm 2 ;The mechanical properties are taken from the hot-rolled annealed plate, and the impact properties are in accordance with the GB / T229 Charpy V-notch impact standard, the sample size is 10×10×55mm, and the test temperatures are 20°C, 0°C, -20°C, - 40°C, -60°C. The anti-pitting corrosion equivalent is calculated according to the general formula...

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Abstract

The invention discloses a duplex stainless steel with pitting corrosion resistance and favourable cold temperature flexibility and a manufacturing method thereof. The duplex stainless steel comprisesthe following components in mass percentage: 0.01-0.10% of C, 0.2-1.0% of Si, more than 0% and less than 1.5% of Mn, 20.0-22.0% of Cr, 1.8-4.0% of Ni, 0.08-0.2% of N, more than 0% and less than 0.5% of Mo, less than or equal to 1.0% of one or more than one of W and Cu and the balance Fe and inevitable impurities. The invention controls Mn content below 1.5% until zero and simultaneously adjusts the content of elements of N, Ni and the like to ensure that steel has high strength, favourable corrosion resistance and favourable impact toughness at room temperature and low temperature when steel contains no or small amount of noble element Mo; meanwhile, the duplex stainless steel has low cost and small hot working difficulty, can be largely applied in the fields of buildings along the coast,petrochemical industry and the like and can replace 304 austenitic stainless steel of which the nickel content is above 8% at room temperature and lower temperature.

Description

Technical field [0001] The present invention relates to duplex stainless steel and its manufacturing method, in particular to a duplex stainless steel with excellent pitting corrosion resistance and low temperature toughness and its manufacturing method. Background technique [0002] Duplex stainless steel is composed of two phases of ferrite and austenite, and the proportion of each phase is not less than 30%. Due to the characteristics of the two-phase structure, duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel. Compared with ferritic stainless steel, it has high toughness, low brittle transition temperature, intergranular corrosion resistance and good welding performance. At the same time, the advantages of ferritic steel with high thermal conductivity and small expansion coefficient are retained. Its yield strength is significantly higher than that of austenitic stainless steel, its chloride stress corrosion crack...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21D8/02C21D1/26
Inventor 张伟胡锦程宋红梅江来珠王治宇崔健
Owner BAOSHAN IRON & STEEL CO LTD
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