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Two-phase stainless steel

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

Inactive Publication Date: 2003-04-23
陈才金
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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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Experimental program
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Effect test

Embodiment

[0014] 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, 0.6-1.2% Al, 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 material ingredients are roasted and dehumidified, and then melted in an intermediate frequency induction furnace or an electric arc furnace to cast ingots. When the product quality requirements are high, AOD refining or electroslag remelting can be carried out. The solid solution temperature is 980°C-1080°C, 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 within the temperatu...

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Abstract

The composition of biphase stainless steel is formed from (wt%) 0.01-0.12% of C, 4.0-8.0 % of Mn, 12.0-25.0% of Cr, 0.20-1.5% of Al, 0.5-3.0% of Ni, 0.4-3.0% of Mo, Cu is greater than or equal to 1.0%, 0.2-2.5% of Si, 0.05-0.3% of N, 0.02-0.05% of Re, S is greater than of equal to 0.03%, P is greater than or equal to 0.035% and the rest is Fe. Said biphase stainless steel can resist alkali corrosion, resist acid corrosion, specially it can resist stress corrosion cracking under the condition of resisting chlorine ion and in oxidative acid medium, can resist seam currosion and resist cavity corrosion, and its strength is high and toughness is good, etc.

Description

[0001] Technology area [0002] The invention relates to a stainless steel. Background technique [0003] 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58
Inventor 陈才金鲁凤娟鲁捷
Owner 陈才金
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