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Method for improving toughness of middle chromium ferritic stainless steel medium plate

A kind of stainless steel, element body technology, applied in the field of metallurgy, to achieve the effect of structure refinement and toughness improvement

Inactive Publication Date: 2012-08-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent No. 201110327451.2 discloses a preparation method of high-strength stainless steel, which uses ECAP (equal channel extrusion) and an appropriate annealing process to improve the mechanical properties of austenitic stainless steel, mainly strength and elongation, but This patent does not control the disadvantage of high ductile-brittle transition temperature of ferritic stainless steel

Method used

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  • Method for improving toughness of middle chromium ferritic stainless steel medium plate
  • Method for improving toughness of middle chromium ferritic stainless steel medium plate
  • Method for improving toughness of middle chromium ferritic stainless steel medium plate

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Experimental program
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Effect test

Embodiment 1

[0029] The chemical composition of the ferritic stainless steel used is: Cr 17%, C 0.005%, N 0.006%, Nb 0.04%, Ti 0.1%, V 0.12%, Mn 0.28%, Si 0.19%, and the balance is Fe and Unavoidable impurities.

[0030] The above-mentioned ferritic stainless steel is smelted and poured to make a slab, heated to 1200°C, kept for 1 hour, air-cooled to 1100°C, then rough rolled and finish rolled, the total reduction is 79%, and the final rolling temperature is 850°C , air-cooled to room temperature to obtain a rolled plate.

[0031] The rolled sheet obtained by finish rolling was reheated to 260° C., and subjected to multi-pass rolling deformation at 260° C. with a cumulative reduction of 66.5%, to obtain a rolled sheet of 6 mm. The rolled plate deformed by multi-pass rolling was kept at 850°C for 5 min to fully recrystallize to obtain the finished plate with fine-grained structure. The corresponding structure is equiaxed ferrite structure with an average grain size of 27.2 μm, such as f...

Embodiment 2

[0035] The chemical composition of the ferritic stainless steel used is: Cr 17%, C 0.006%, N 0.006%, Nb 0.04%, Ti 0.2%, Mn 0.5%, Si 0.01%, and the balance is Fe and unavoidable impurities.

[0036] The above-mentioned ferritic stainless steel is smelted and poured to make a slab, heated to 1250°C, kept for 1 hour, air-cooled to 1100°C, then rough rolled and finish rolled, the total reduction is 70%, and the final rolling temperature is 950°C , air-cooled to room temperature to obtain a rolled plate.

[0037] The rolled sheet slab obtained by finish rolling was reheated to 600°C, and subjected to multi-pass rolling deformation at 600°C with a cumulative reduction of 80%, to obtain a rolled sheet of 6mm. The rolled plate deformed by multi-pass rolling was kept at 850°C for 5 min to fully recrystallize to obtain the finished plate with fine-grained structure.

[0038]The impact samples with dimensions of 5mm×10mm×55mm were obtained through sawing machine and grinding machine. C...

Embodiment 3

[0040] The chemical composition of the ferritic stainless steel used is: Cr 22%, C 0.008%, N 0.007%, Nb 0.3%, V 0.12%, Mn 0.1%, Si 0.6%, and the balance is Fe and unavoidable impurities.

[0041] The above-mentioned ferritic stainless steel is smelted and poured to make a slab, heated to 1100°C, kept for 2 hours, air-cooled to 1100°C, then rough rolled and finish rolled, the total reduction is 90%, and the final rolling temperature is 850°C , air-cooled to room temperature to obtain a rolled plate.

[0042] The rolled sheet obtained by finish rolling was reheated to 400° C., and subjected to multi-pass rolling deformation with a cumulative reduction of 40% at 400° C. to obtain a rolled sheet of 11 mm. The rolled plate deformed by multi-pass rolling was kept at 900°C for 10 min to make it fully recrystallized, and then the finished plate with fine-grained structure was obtained.

[0043] The impact samples with dimensions of 10mm×10mm×55mm were obtained through sawing machine ...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a method for improving the toughness of a middle chromium ferritic stainless steel medium plate. The method comprises the following steps: selecting a middle chromium ferritic stainless steel; smelting and casting the middle chromium ferritic stainless steel into a plate blank; heating the plate blank to the temperature of 1100-1250 DEG C; preserving the temperature for 1-2 hours; rough rolling and finish rolling at the temperature of 850-1100 DEG C; air cooling to a room temperature to obtain a rolled sheet material; reheating the rolled heat material to the temperature of 260-600 DEG C; and carrying out multiple rolling deformation with the total cumulative reduction amount is 40-80%. With adoption of the method, a high-toughness ferritic stainless steel medium plate can be obtained; the structure of the ferritic stainless steel medium plate is obviously refined; the corresponding ductile-brittle transition temperature is lowered to 20-41 DEG C; and the toughness is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for improving the toughness of medium chromium ferritic stainless steel plates. Background technique [0002] Ferritic stainless steel refers to stainless steel that is mainly composed of ferrite in use. In addition to its stainless and general corrosion resistance, it has excellent properties such as chloride stress corrosion resistance, pitting corrosion resistance, and crevice corrosion resistance, and has the characteristics of low cold hardening tendency, high thermal conductivity and low linear expansion coefficient. At the same time, because ferritic stainless steel does not contain nickel or only contains a small amount of nickel, its production cost is low, and it has been widely used in civil and industrial fields such as kitchen utensils, household appliances, decorative buildings, transportation, petrochemical, nuclear energy, and ships. . [0003] With ...

Claims

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Application Information

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IPC IPC(8): C21D8/02
Inventor 刘振宇高飞刘海涛唐帅贾涛
Owner NORTHEASTERN UNIV
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