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Biphase stainless steel

A duplex stainless steel, content technology, applied in the field of stainless steel, can solve the problems of poor acid resistance, affecting the performance and application range, coarse grains, etc., to achieve rare non-metallic impurities, excellent comprehensive mechanical properties and corrosion resistance, grain size tiny effect

Inactive Publication Date: 2009-05-13
顾贤良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these iron-manganese-aluminum-chromium austenitic stainless steels have the disadvantages of poor acid resistance, coarse grains and well-developed columnar grains, which affect their performance and application range.

Method used

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Effect test

Embodiment

[0013] The duplex stainless steel of the present invention uses scrap steel (08F), industrial electrolytic manganese, ferrochromium nitride, ferromolybdenum, scrap aluminum cable and scrap nickel-chromium stainless steel as raw materials. Its composition (weight%) is ≤0.04%C, 5.0-8.0%Mn, 20.0-22.0%Cr, 0.6-1.2Al, 1.5%Ni, 0.8-1.5%Mo, 0.8-1.0%Cu, 0.8-1.0%Si , 0.05-0.1% N, 0.02% Re, ≤0.03% S, ≤0.035% P, and the rest is Fe. According to this composition, the raw materials and materials are roasted and dehumidified, and then melted in an intermediate frequency induction furnace or an electric arc furnace, and then cast into ingots. When the product quality requirements are high, AOD refining or electroslag remelting can be carried out. The solid solution temperature is 980-1080°C, and it should be air-cooled or water-cooled after proper heat preservation. The duplex stainless steel of the present invention can be cast or rolled into a material as required, or forged into a billet ...

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Abstract

The invention relates to a two phase stainless steel, which comprises the following chemical components in weight percent: 0 to 0.12 percent of C, 4.0 to 8.0 percent of Mn, 12.0 to 25.0 percent of Cr, 0.20 to 1.5 percent of Al, 0.5 to 3.0 percent of Ni, 0.4 to 3.0 percent of Mo, 0 to 1.0 percent of Cu, 0.2 to 2.5 percent of Si, 0.05 to 0.3 percent of N, 0.02 to 0.05 percent of Re, less than or equal to 0.03 percent of S, less than or equal to 0.035 percent of P, and the balance being Fe. The two phase stainless steel has the advantages of high strength, good toughness, excellent wear resistance and corrosion resistance, in particular the superiorities of stress corrosion cracking resistance, complete corrosion resistance, intergranular corrosion resistance, and pitting corrosion resistance and vacuole corrosion resistance in sea water in solutions such as strong base (such as NaOH), chlor-alkali (NH4Cl), oxidizing acid (such as HNO3), sodium thiocyanate, phosphate solution, good hot and cold processability, and low cost.

Description

technical field [0001] The invention relates to a stainless steel. Background technique [0002] For decades, the most widely used stainless steel at home and abroad is nickel-chromium stainless steel, of which austenitic nickel-chromium stainless steel is the most used. Since the discovery and application of duplex stainless steel in the 1930s, due to its good resistance to pitting corrosion and stress corrosion cracking, it has attracted the attention of the scientific and technological circles and the industrial circles in the 1980s and accelerated its development. So far, it has become one of the three major types of stainless steel alongside ferritic and austenitic stainless steel. my country has started to study duplex stainless steel since the 1970s, and there have been several grades corresponding to foreign countries, which has opened up a way for the development and application of duplex stainless steel in my country. However, these duplex stainless steels are al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58
Inventor 顾贤良张长林
Owner 顾贤良
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