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Method for improving hot-working performance and room-temperature plasticity of high-boron stainless steel

A stainless steel and hot working technology, applied in the field of metallurgical materials, can solve problems such as poor hot working performance and edge cracking, and achieve the effects of short production process, delayed plastic instability, and excellent room temperature plasticity.

Active Publication Date: 2017-05-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of severe edge cracking caused by poor hot workability of existing high boron stainless steel during hot rolling, the present invention provides a method for improving hot workability and room temperature plasticity of high boron stainless steel. The austenitic stainless steel plate is covered on the top and bottom of the high-boron stainless steel billet. During the hot rolling process, the austenitic stainless steel layer can effectively inhibit the generation and expansion of cracks at the edge of the high-boron stainless steel layer. The obtained high-boron stainless steel composite hot-rolled plate is only slight edge crack

Method used

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  • Method for improving hot-working performance and room-temperature plasticity of high-boron stainless steel
  • Method for improving hot-working performance and room-temperature plasticity of high-boron stainless steel
  • Method for improving hot-working performance and room-temperature plasticity of high-boron stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Molten steel is smelted, and high-boron stainless steel ingots are obtained by die-casting. Its chemical composition is Cr18.5%, Ni 13.9%, Mn 1.81%, B 2.11%, C 0.05%, and the rest is Fe and unavoidable impurity elements;

[0028] Use sawing machine, milling machine and grinding machine to cut and surface finish the high boron stainless steel ingot to obtain a high boron stainless steel billet with smooth and bright surface and roughness Ra<0.8um;

[0029] Use sawing machine, milling machine and grinding machine to cut and finish the surface of austenitic stainless steel plate to obtain austenitic stainless steel plate with smooth and bright surface and roughness Ra<0.8um, and its length and width are the same as those of high boron stainless steel billet ; Among them, the chemical composition of the austenitic stainless steel plate is Cr 18.3%, Ni 13.9%, Mn 1.81%, C 0.05% by mass percentage, and the rest is Fe and unavoidable impurity elements;

[0030] Use acetone and...

Embodiment 2

[0035] Method is with embodiment 1, and difference is:

[0036] (1) The chemical composition of high boron stainless steel ingots is Cr 17.0%, Ni 15.0%, Mn 1.5%, B2.25%, C 0.07% by mass percentage, and the rest is Fe and unavoidable impurity elements;

[0037] (2) The chemical composition of the austenitic stainless steel plate is Cr 17.0%, Ni 15.0%, Mn 1.5%, C0.07% by mass percentage, and the rest is Fe and unavoidable impurity elements;

[0038] (3) The ratio of the thickness of each austenitic stainless steel plate to the thickness of the high-boron stainless steel billet is 1 / 2, and then welding is carried out along the periphery of the contact surface of the billet under the vacuum condition of pressure P<5.0Pa to form an uninterrupted welding seam to obtain a composite blank;

[0039](4) Put the composite billet into the heating furnace and raise the temperature to 1150°C with the furnace, and keep it warm for 20 minutes, and then perform 10 passes of hot rolling. The h...

Embodiment 3

[0042] Method is with embodiment 1, and difference is:

[0043] (1) The chemical composition of the high-boron stainless steel ingot is Cr 19.5%, Ni 12.0%, Mn 2.0%, B 1.75%, C 0.04% by mass percentage, and the rest is Fe and unavoidable impurity elements;

[0044] (2) The chemical composition of the austenitic stainless steel plate is Cr 19.5%, Ni 12.0%, Mn 2.0%, C0.04% by mass percentage, and the rest is Fe and unavoidable impurity elements;

[0045] (3) The ratio of the thickness of each austenitic stainless steel plate to the thickness of the high-boron stainless steel billet is 1 / 10, and then welding is carried out along the periphery of the contact surface of the billet under the vacuum condition of pressure P<5.0Pa to form an uninterrupted welding seam to obtain a composite blank;

[0046] (4) Put the composite billet into the heating furnace and raise the temperature to 1140°C with the furnace, and keep it warm for 40 minutes, and then carry out 5 passes of hot rolling...

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Abstract

A method for improving the hot-working performance and the room-temperature plasticity of high-boron stainless steel is carried out through the following steps that firstly, molten steel is smelted, and a high-boron stainless steel cast ingot is obtained in a die casting manner, wherein the high-boron stainless steel cast ingot comprises 17.0%-19.5% of Cr, 12.0%-15.0% of Ni, 1.5%-2.0% of Mn, 1.75%-2.25% of B, smaller than 0.08% of C and the balance Fe; secondly, cutting and surface finishing are carried out on the high-boron stainless steel cast ingot; thirdly, cutting and surface finishing are carried out on austenitic stainless steel plates; fourthly, surface washing is carried out; fifthly, the austenitic stainless steel plates are arranged on the upper face and the lower face of the square high-boron stainless steel billet, the austenitic stainless steel plates and the square high-boron stainless steel billet are aligned, and welding is carried out on the vacuum condition; sixthly, hot rolling is carried out; and seventhly, water quenching is carried out after solution treatment is completed. By means of the method, the production procedures are short, the production cost is low, only slight edge cracking occurs to the high-boron stainless steel in the hot rolling process, and the finally obtained high-boron stainless steel clad plate has relatively excellent room temperature plasticity.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, in particular to a method for improving the thermal processing performance and room-temperature plasticity of high-boron stainless steel. Background technique [0002] Boron element has good neutron absorption ability. After absorbing neutrons, it only produces soft gamma photons of about 0.5 Mev and easily absorbed alpha particles; boron can be added to stainless steel to obtain spent fuel storage grids and transport containers. The functional materials can effectively ensure that the depth of nuclear fuel is at the subcritical safety valve, ensure the safety of spent fuel storage and transportation, and ensure the safety of relevant operators. [0003] The solid solubility of boron in γ-Fe is very small, only 33 ppm at 1000°C. Adding excessive boron to steel will cause a large amount of eutectic structure containing hard and brittle borides to precipitate along the matrix grain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/58C22C38/04C21D8/02C21D6/00B23P15/00
CPCB23P15/00C21D6/004C21D8/0226C22C38/04C22C38/54C22C38/58
Inventor 刘海涛李永旺黄晓明张宝光张晓明王国栋
Owner NORTHEASTERN UNIV
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