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Method for preparing high nitrogen and nickel-less austenitic stainless steel

An austenitic stainless steel and high-nitrogen technology, which is applied in the field of smelting and manufacturing high-nitrogen nickel-free austenitic stainless steel, can solve problems such as difficult claims, and achieve the effects of low production cost, simple requirements for smelting equipment, and high efficiency

Inactive Publication Date: 2008-10-15
上海莅辰企业管理中心(有限合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it is pointed out that the content and solid solution treatment of carbon (C), chromium (Cr), manganese (Mn), molybdenum (Mo), copper (Cu), etc. in austenitic stainless steel mentioned in the patent application (02132853.6) They are all common sense of alloy steel principle, and are the same or similar to the alloy composition and post-treatment method of smelting high-nitrogen austenitic stainless steel in foreign countries, so it is difficult to be supported in the claims

Method used

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  • Method for preparing high nitrogen and nickel-less austenitic stainless steel
  • Method for preparing high nitrogen and nickel-less austenitic stainless steel
  • Method for preparing high nitrogen and nickel-less austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First smelt 100kg of Cr-Mn basic steel in an induction furnace, then carry out converter refining, adjust the chemical composition (wt%): C 0.03; Cr 9; Mn 14; Si 0.58; Mo 1.5; P≤0.02; S≤0.02; The rest is iron.

[0026] Mix 12 kg of high-nitrogen ferrochrome alloy containing 63% Cr and 8% N with a particle size of 20 mesh and 3 kg of chromium nitride with a particle size of 80 mesh to prepare high-nitrogen alloy powder.

[0027] The Cr-Mn basic molten steel and the prepared high-nitrogen alloy mixed solid are poured into a 20×80mm square crystallizer together, and electromagnetic stirring is performed at the same time to rapidly solidify into a billet. Metallographic examination such as figure 1 As shown, undissolved nitrides and high-temperature ferrite in the form of strips and spheres can be seen.

[0028] The steel billet is heated to 1200°C and rolled into a plate for solution treatment, and the solution temperature is 1000°C. Its metallographic examination as ...

Embodiment 2

[0030] Refining 100kg of Cr-Mn base steel, adjusting the chemical composition (wt%): C 0.03; Cr12; Mn18; Si 0.58; Mo 1.5; P≤0.02; S≤0.02; Control molten steel temperature: 1650°C.

[0031] Add 15 kg of high-nitrogen ferrochrome alloy powder (50 mesh, 63% Cr, 8% N) plated with Cr in molten steel, and after electromagnetic stirring for 30 seconds, quickly pour into an ingot mold with high cooling capacity, quickly solidify into a steel ingot, and then Hot rolling and solution treatment were performed as described above. Composition inspection (wt%): C0.045; Cr 21; Mn 15; Si 0.42; N 0.93; Mo1.2; The microstructure is a single-phase austenite with a face-centered cubic lattice.

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Abstract

The invention provides a method for smelting and manufacturing a high-nitrogen nickel-free austenitic stainless steel under normal pressure. The method comprises the following: a step of rapidly adding high-nitrogen alloy before or when the refined Cr-Mn base steel to be poured is poured; a step of stirring the mixture rapidly; a step of quickly casting the steel liquid which is not or little dissolved in the high-nitrogen alloy to make blank material; a step of dealing with the blank material through thermal deformation process and solution treatment to obtain the single phase austenitic stainless steel with 0.6-1.2 weight percent of nitrogen. The method can be carried out under the normal pressure without being smelted at high pressure. Moreover, the method has the advantages of low cost, high efficiency, simple process and accurate control of N, can produce various profiles and is suitable for the mass production.

Description

technical field [0001] The invention relates to a method for smelting and manufacturing stainless steel, in particular to a method for smelting and manufacturing high-nitrogen nickel-free austenitic stainless steel. Background technique [0002] With the rapid increase in demand for Cr (chromium)-Ni (nickel) austenitic stainless steel, Ni resources have become scarce, and its price has continued to rise, making Ni account for 60-80% of the cost of this type of steel. Therefore, countries all over the world are focusing on the research and development of austenitic stainless steel that replaces Ni with other elements. Among them, the use of the beneficial and cheap element N (nitrogen) as a substitute for Ni to produce high-N Ni-free austenitic stainless steel has become the focus of research. [0003] At present, the difficulty in producing high-nitrogen nickel-free austenitic stainless steel with N-generation Ni is that the solubility of N in molten steel under normal pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/00
Inventor 季长涛刘云旭王淮吴化
Owner 上海莅辰企业管理中心(有限合伙)
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