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A method for manufacturing nitrogen-controlled austenitic stainless steel large forgings

A technology of austenitic stainless steel and manufacturing method, applied in the direction of manufacturing tools, forging/pressing/hammer devices, heating/cooling equipment, etc., can solve problems such as uneven grain size and not meeting the requirements for the use of large forgings, and achieve comprehensive Good performance, solve the problem of mixed crystals in large forgings, and reduce manufacturing costs

Active Publication Date: 2018-04-27
宝武特种冶金有限公司
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Problems solved by technology

If the large forgings of nitrogen-controlled austenitic stainless steel are produced by conventional technology, there will be uneven grain size, which does not meet the requirements for the use of large forgings

Method used

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  • A method for manufacturing nitrogen-controlled austenitic stainless steel large forgings
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  • A method for manufacturing nitrogen-controlled austenitic stainless steel large forgings

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with embodiment.

[0044] The technological process used in the embodiment of the present invention is: 40 tons of electric arc furnace out of the furnace → 40 tons of AOD refining furnace → 40 tons of LF refining furnace → mold casting Electrode rod → electroslag remelting → forged product of 2000t or 4000t fast forging machine → solid solution treatment of finished product → testing → qualified storage.

[0045] Table 1 is the steel composition of the embodiment of the present invention, table 2 is the forging and solution treatment process parameters of the embodiment of the present invention, table 3 is the room temperature mechanical properties of the steel of the embodiment of the present invention (test standard: GB / T228), table 4 Table 5 is the mechanical properties at 350°C of the steel of the embodiment of the present invention (test standard: GB / T4338), and Table 5 is the grain size of the ...

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Abstract

A manufacturing method of a nitrogen-controlled austenitic stainless steel large forging piece comprises the following steps of electric furnace primary melting, AOD refining, LF refining, die casting pouring, electroslag remelting and forging. In LF refining, double deoxidizer with the mass ratio of Al to Si being 7:3 is adopted. In electroslag remelting, a quaternary slag system with the ratio of CaF2:Al2O3:CaO:MgO equal to 72:18:5:5 is selected as electroslag protection slag. In forging, a multi-time heading pulling manner is adopted, the first fire temperature, the second fire temperature, the third fire temperature and the deformation are all controlled to be larger than 30%, it is ensured that a large amount of recrystallization is generated in the post-forging cooling process, the grain sizes are all not thicker by 4 levels after products are in solid solution, and the problem of mixed crystals of the large forging piece is effectively solved; and the nitrogen-controlled austenitic stainless steel large forging piece has good comprehensive performance and can be kept with good performance under the condition of the temperature of 350 DEG C, and the using requirement of engineering structural pieces is met.

Description

technical field [0001] The invention belongs to the field of austenitic stainless steel processing, and in particular relates to a method for manufacturing large forgings of nitrogen-controlled austenitic stainless steel. Background technique [0002] With the development of science and technology, stainless steel forgings are used more and more. In some special occasions, the requirements for material properties are strict, and they are required to have excellent corrosion resistance and good structural manufacturing process. Nitrogen-controlled austenitic stainless steel has excellent corrosion resistance, and the strength and corrosion resistance are well matched, and the structure manufacturing process is good, so it is the material of choice for engineering structural parts. Most of our country uses 0Cr18Ni10Ti stainless steel, which has high carbon content and poor corrosion resistance. Engineering structural parts made of 0Cr18Ni10Ti stainless steel, after assembly a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/54C21D1/00B21J5/06B21K29/00
Inventor 朱长春徐松乾庄伟金成
Owner 宝武特种冶金有限公司
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