Ultrapurification high nitrogen austenitic stainless steel and its preparation method

A high nitrogen austenite and nitrogen austenite technology is applied in the field of nickel-free high nitrogen austenitic stainless steel and vacuum induction furnace smelting process, which can solve the problems of reducing cost, being difficult to achieve, and increasing smelting cost.

Inactive Publication Date: 2004-03-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the smelting of high-nitrogen steel usually adopts pressurized electroslag remelting and reverse pressure casting to manufacture high-nitrogen steel (the highest nitrogen content can reach more than 1%). Others include hot isostatic pressing, pressure induction melting and powder Metallurgical methods and other smelting processes, but these smelting processes require special smelting equipment, and using the above smelting methods to control the extremely low content of impurity elements in steel will greatly increase the smelting cost, and it is difficult to achieve the goal of reducing costs by substituting nitrogen for nickel original intention

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  • Ultrapurification high nitrogen austenitic stainless steel and its preparation method
  • Ultrapurification high nitrogen austenitic stainless steel and its preparation method

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Embodiment

[0028] According to the chemical composition range set by the present invention, 5 heats of steel were smelted in a 25 kg vacuum induction furnace, and its specific chemical composition is as shown in Table 1. These 5 furnaces of steel were respectively poured into a φ120×450 steel ingot, and processed according to the above processing and heat treatment specifications.

[0029] All test specimens are sampled vertically along the rolling direction, and steel of the present invention is a single austenitic structure (such as figure 1 , figure 2 Shown), the measured mechanical properties of nickel-free high-nitrogen austenitic stainless steel are shown in Table 2. It can be seen from the examples that the strength, toughness and plasticity of the nickel-free austenitic stainless steel smelted in the present invention have reached or exceeded the level of traditional nickel-chromium stainless steel. The addition of nitrogen effectively replaces the role of nickel and increases...

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Abstract

A superpure high-nitrogen stainless austenite steel contains Cr (17-19 wt.%), Mn (12-16 wt.%), Mo (2-3 wt.%), Cu (0.5-1.5 wt.%), Ni (0-0.2 wt.%), N (0.4-0.6 wt.%), C (0-0.05 wt.%), Si (0-0.5 wt.%), S (0-0.009 wt.%), P (0-0.009 wt.%) and Fe (rest). It is smelted by vacuum induction furnace, where nitrogen is added in FeCrN, CrN or MnN mode.

Description

Technical field: [0001] The invention relates to a nickel-free high-nitrogen austenitic stainless steel and a vacuum induction furnace smelting process. Background technique: [0002] Austenitic stainless steel usually contains more than 8% nickel to stabilize the austenite phase in it, but due to the high price of elemental nickel and the uncontrolled change in price, steel material manufacturers develop low nickel content in which nickel is replaced by nitrogen Or nickel-free high nitrogen austenitic stainless steel. The development of nickel-free high-nitrogen austenitic stainless steel can not only reduce the cost of steel, but also save valuable strategic resources, but one of the factors restricting its development is the smelting of high-nitrogen steel. Since nitrogen is a gaseous element with low solubility in steel, economical and effective methods to smelt high-nitrogen steel have been attracting attention. [0003] At present, the smelting of high-nitrogen steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22
Inventor 任伊宾杨柯张炳春梁勇
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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