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Carbon steel continuous casting powder in phi 700-800mm round billet

A technology for continuous casting mold flux and mold flux, which is applied in the field of metal smelting auxiliary materials, can solve the problems of continuous bonding and breakout, and achieve the effects of good spreadability and uniform slag melting.

Active Publication Date: 2013-09-11
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this type of representative slag system is used on a section of ￠700~800mm, it will solve the problem of surface defects such as cracks, but the problems of adhesion and breakout will continue to be extreme.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A ￠700-800mm round billet medium carbon steel continuous casting mold powder, its raw materials include: carbon black, microcrystalline graphite powder, power plant ash powder, light burnt magnesia powder, bauxite powder, limestone powder, wollastonite powder, The weight percentages of fluorite powder, industrial soda ash, and borax are 2%, 13%, 15%, 9%, 3%, 5%, 25%, 14%, 12%, and 2% respectively.

[0029] Further, the composition and weight percentage of the carbon steel continuous casting mold flux in the ￠700~800mm round billet are as follows: AL 2 O 3 The content is 5.45%, the MgO content is 9.24%, the rest is CaO, SiO 2 , Fe 2 O 3 , Na 2 O, F - , B, C, the weight percentages are 26.58%, 24.5%, 2.6%, 8.36%, 5.24%, 0.7%, 17%, and the binary alkalinity of the mold powder (CaO / SiO 2 Mass percentage) 1.05~1.15.

Embodiment 2

[0031] A ￠700-800mm round billet medium carbon steel continuous casting mold powder, its raw materials include: carbon black, microcrystalline graphite powder, power plant ash powder, light burnt magnesia powder, bauxite powder, limestone powder, wollastonite powder, The weight percentages of fluorite powder, industrial soda ash, and borax are 2%, 13%, 15%, 9%, 3%, 5%, 25%, 14%, 12%, and 2% respectively.

[0032] Further, the composition and weight percentage of the carbon steel continuous casting mold flux in the ￠700~800mm round billet are as follows: AL 2 O 3 The content is 7.78%, the MgO content is 7.15%, the rest is CaO, SiO 2 , Fe 2 O 3 , Na 2 O, F - , B, C, the weight percentages are 22.5%, 23.9%, 0.94%, 6.5%, 8.1%, 0.88%, 14.5%, and the binary alkalinity (CaO / SiO 2 Mass percentage) 1.05~1.15.

Embodiment 3

[0034] A ￠700-800mm round billet medium carbon steel continuous casting mold powder, its raw materials include: carbon black, microcrystalline graphite powder, power plant ash powder, light burnt magnesia powder, bauxite powder, limestone powder, wollastonite powder, The weight percentages of fluorite powder, industrial soda ash, and borax are 2%, 13%, 15%, 9%, 3%, 5%, 25%, 14%, 12%, and 2% respectively.

[0035] Further, the composition and weight percentage of the carbon steel continuous casting mold flux in the ￠700~800mm round billet are as follows: AL 2 O 3 The content is 6.23%, the MgO content is 8.96%, the rest is CaO, SiO 2 , Fe 2 O 3 , Na 2 O, F - , B, C, the weight percentages are 24.15%, 21.87%, 1.24%, 7.04%, 6.39%, 0.89%, 16%, and the binary alkalinity (CaO / SiO 2 Mass percentage) 1.10.

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Abstract

The invention discloses a carbon steel continuous casting powder in a phi 700-800mm round billet, raw materials of the carbon steel continuous casting powder include: carbon black, microcrystal graphite powder, ash content of power plant, light burning magnesia clinker powder, bauxite powder, limestone powder, wollastonite powder, flousper powder, industry pure alkali and borax, which are respectively in weight percentage of 2%, 13%, 15%, 9%, 3%, 5%, 25%, 14%, 12% and 2%. The product is tested and normally used on the phi 700-800mm round billet, in a crystallizer, spreadability is good, powder smelting is uniform, a melt cinder layer is 9-12mm, powder consumption is 0.62kg / t, and qualifying rate of a casting blank surface is more than 98%, simultaneously, bonding and steel breakout are avoided, so that stringent requirements of steel continuous casting in the phi 700-800mm round billet on powder performance are satisfied.

Description

Technical field [0001] The invention belongs to the technical field of metal smelting auxiliary materials, in particular to a mold slag for continuous casting of medium-carbon steel in round billets of ￠700-800mm. technical background [0002] With the development of the world economy, the demand for seamless steel pipes is developing in the direction of special and extra large. The multi-variety and high-quality round billets required by them have attracted the attention of many round billet steel mills. The advanced steelmaking technology, out-of-furnace refining, continuous casting protection pouring, electromagnetic stirring, spray cooling technology, etc., which emerged at the historic moment, make it no longer difficult to produce large-section round billets with high yield without surface defects and internal defects at high drawing speed. At the same time, it is possible to make large-section seamless steel pipes with stable hot rolling and hot rolling. [0003] Round bill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 屈党军张洪战徐金岩张福陈永艳
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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