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Low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag

A high-nitrogen austenite and continuous casting crystallizer technology, applied in the field of metal smelting auxiliary materials, can solve the problems of difficult processing, mold slag can not be solved well, cold work hardening rate increases, etc., to achieve the effect of satisfying performance

Active Publication Date: 2018-08-31
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2) The cold work hardening rate rises sharply and the processing is difficult
[0023] 7. In view of the defects in the current slab, the original mold slag cannot solve the problem very well, and it is necessary to adjust the appropriate mold slag according to the change of the steel composition

Method used

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  • Low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag
  • Low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag
  • Low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The raw material of low-nickel high-nitrogen austenitic stainless steel continuous casting mold flux in this embodiment contains 6wt% glass powder, 15wt% fluorite powder, 3.5wt% industrial soda ash, 1.8wt% N220 lamp black, 0.8 wt% high-grade carbon powder, 1.5wt% flake graphite powder, 6wt% wollastonite powder, 12wt% limestone powder, 6wt% calcined magnesia powder and 47.4wt% premelted powder.

[0061] The chemical composition of the low-nickel and high-nitrogen austenitic stainless steel continuous casting mold flux contains 36.32wt% CaO and 27.19wt% SiO 2 , 5.4wt% Al 2 o 3 , 1.6wt% Fe 2 o 3 , 4.6wt% MgO, 8.2wt% Na 2 O, 6.1 wt% F and 3.56 wt% C.

[0062] The above-mentioned low-nickel and high-nitrogen austenitic stainless steel continuous casting mold flux has a binary basicity of 1.32, a melting point of 1182°C, a viscosity of 0.135 Pa·S at 1300°C, and a crystallization rate of 43%.

Embodiment 2

[0064] The raw material of the low-nickel high-nitrogen austenitic stainless steel continuous casting mold flux in this embodiment contains 7wt% glass powder, 14wt% fluorite powder, 4.5wt% industrial soda ash, 1.8wt% N220 lamp black, 0.8 wt% high-grade carbon powder, 1.5wt% flake graphite powder, 8wt% wollastonite powder, 10wt% limestone powder, 5wt% calcined magnesia powder and 47.4wt% premelted powder.

[0065] The chemical composition of the low-nickel and high-nitrogen austenitic stainless steel continuous casting mold flux contains 36.68wt% CaO and 27.93wt% SiO 2 , 5.8wt% Al 2 o 3 , 1.8wt% Fe 2 o 3 , 4.8wt% MgO, 8.5wt% Na 2 O, 7.6 wt% F and 3.62 wt% C.

[0066] The above-mentioned low-nickel and high-nitrogen austenitic stainless steel continuous casting mold flux has a binary basicity of 1.35, a melting point of 1185°C, a viscosity of 0.146Pa·S at 1300°C, and a crystallization rate of 48%.

Embodiment 3

[0068] The raw material of the low-nickel high-nitrogen austenitic stainless steel continuous casting mold flux in this embodiment contains 5wt% glass powder, 16wt% fluorite powder, 2.5wt% industrial soda ash, 1.8wt% N220 lamp black, 0.8 wt% high-grade carbon powder, 1.5wt% flake graphite powder, 7wt% wollastonite powder, 11wt% limestone powder, 7wt% calcined magnesia powder and 47.4wt% premelted powder.

[0069] The chemical composition of the low-nickel and high-nitrogen austenitic stainless steel continuous casting mold flux contains 36.5wt% CaO and 27.45wt% SiO 2 , 5.6wt% Al 2 o 3 , 1.7wt% Fe 2 o 3 , 4.5wt% MgO, 8.3wt% Na 2 O, 7.5 wt% F and 3.59 wt% C.

[0070] The above-mentioned low-nickel and high-nitrogen austenitic stainless steel continuous casting mold flux has a binary basicity of 1.34, a melting point of 1183°C, a viscosity of 0.131Pa·S at 1300°C, and a crystallization rate of 60%.

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Abstract

The invention relates to low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag, and belongs to the technical field of metal smelting accessories. The low-nickel high-nitrogen austenitic stainless steel continuous casting crystallizer covering slag is prepared from, by weight, 33.5-38.25 parts of CaO, 25.4-29.6 parts of SiO2, 3-6 parts of Al2O3, larger than 0 and smaller than or equal to 4 parts of Fe2O3, 2-5 parts of MgO, 3.5-9.5 parts of Na2O, 4.5-8.5 parts of F and 3-7 parts of C. The covering slag has the appropriate alkalinity, smelting point, viscosity and carbon addition, suitable heat transfer ability and good filling performance, and can well adapt to characteristics of low-nickel high-nitrogen austenitic stainless steel continuous casting.

Description

technical field [0001] The invention relates to the technical field of auxiliary materials for metal smelting, and in particular to a low-nickel and high-nitrogen austenitic stainless steel mold flux for continuous casting. Background technique [0002] At present, stainless steel is classified into austenite, martensite, ferrite, duplex stainless steel and precipitation hardening stainless steel according to its composition and structure in the world, but the amount of austenite is the largest, and the cost is relatively low, and the performance can be partially The 200 series austenitic stainless steel instead of 304 austenitic is currently developing strongly in China. [0003] my country's nickel resources are scarce, and chromium resources are not abundant. Substituting manganese-nitrogen for nickel, nitrogen for carbon, and 200 series stainless steel in the form of low nickel and high nitrogen can not only reduce costs, but also have far-reaching strategic significance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 杜振宇李晓阳屈党军徐金岩马帅陈永彦王希彬任义
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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