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Method for producing anti-acid anti-corrosion pipeline steel plate billet through chamfering crystallizer continuous casting machine

A technology of chamfering mold and continuous casting machine, applied in the field of metallurgy, can solve the problems of low pass rate of anti-HIC performance, unstable acid and corrosion resistance of pipeline steel, etc., to eliminate hydrogen diffusion channels, improve product quality, Eliminate or lighten the effect of band tissue

Inactive Publication Date: 2019-01-08
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, traditional slabs are generally used to produce acid-resistant and corrosion-resistant pipelines. The acid-resistant and corrosion-resistant performance of the pipeline steel produced is unstable, especially the pass rate of HIC resistance is not high.

Method used

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  • Method for producing anti-acid anti-corrosion pipeline steel plate billet through chamfering crystallizer continuous casting machine
  • Method for producing anti-acid anti-corrosion pipeline steel plate billet through chamfering crystallizer continuous casting machine
  • Method for producing anti-acid anti-corrosion pipeline steel plate billet through chamfering crystallizer continuous casting machine

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The thickness specification of the acid-resistant and corrosion-resistant pipeline steel slab in this example is 236mm, and its chemical composition and mass percentage are: C: 0.034%, Si: 0.18%, Mn: 1.18%, P: 0.007%, S: 0.0008% , Nb: 0.0320%, Ti: 0.015%, Ca: 0.0020%, Al: 0.035%, Mo: 0.11%, and the balance is Fe and unavoidable impurities.

[0028] In this embodiment, a method for producing an acid-resistant and corrosion-resistant pipeline steel slab by a chamfering crystallizer continuous casting machine includes molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, and continuous casting. The specific process steps are as follows:

[0029] (1) Hot metal pretreatment process: hot metal P: 0.043%, S: 0.029%, lime and magnesium powder are used for composite desulfurization, the injection ratio of powder lime and magnesium powder is 2.5, the slag is cleaned after desulfurization, and the sulfur after the converter is 47ppm;

[0030] (2) Converte...

Embodiment 2

[0038] The thickness specification of the acid-resistant and corrosion-resistant pipeline steel slab in this embodiment is 235mm, and its chemical composition and mass percentage are: C: 0.025%, Si: 0.28%, Mn: 0.95%, P: 0.005%, S: 0.0007% , Nb: 0.045%, Ti: 0.010%, Ca: 0.0010%, Al: 0.025%, Mo: 0.09%, and the balance is Fe and unavoidable impurities.

[0039] In this embodiment, a method for producing an acid-resistant and corrosion-resistant pipeline steel slab by a chamfering crystallizer continuous casting machine includes molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, and continuous casting. The specific process steps are as follows:

[0040] (1) Hot metal pretreatment process: hot metal P: 0.055%, S: 0.035%, lime and magnesium powder are used for composite desulfurization, the injection ratio of powder lime and magnesium powder is 2.7, the slag is cleaned after desulfurization, and the sulfur after the converter is 53ppm;

[0041] (2) Conver...

Embodiment 3

[0047] The thickness specification of the acid-resistant and corrosion-resistant pipeline steel slab in this embodiment is 245mm, and its chemical composition and mass percentage are: C: 0.042%, Si: 0.16%, Mn: 0.84%, P: 0.004%, S: 0.0005% , Nb: 0.054%, Ti: 0.016%, Ca: 0.0042%, Al: 0.038%, Mo: 0.12%, and the balance is Fe and unavoidable impurities.

[0048] In this embodiment, a method for producing an acid-resistant and corrosion-resistant pipeline steel slab by a chamfering crystallizer continuous casting machine includes molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, and continuous casting. The specific process steps are as follows:

[0049] (1) Hot metal pretreatment process: hot metal P: 0.059%, S: 0.033%, lime and magnesium powder are used for composite desulfurization, the injection ratio of powder lime and magnesium powder is 2.8, the slag is cleaned after desulfurization, and the sulfur after the converter is 42ppm;

[0050] (2) Conver...

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Abstract

The invention discloses a method for producing an anti-acid anti-corrosion pipeline steel plate billet through a chamfering crystallizer continuous casting machine. The method comprises the working procedures of hot metal pretreatment, converter smelting, LF refining, RH vacuum treatment and continuous casting. The chamfering angle of a crystallizer is 44.95-45.05 degrees, the chamfering width is39.90-40.10mm, the flow speed of cooling water in a chamfering crystallizer copper plate water groove is 6.5-7.0m / s, the water yield of the narrow face of the chamfering crystallizer is 560-570L / min,and the water yield of the wide face is 4300-4400L / min. The design of low carbon, ultralow phosphorus and sulfur and low manganese content is adopted, the dual technology and argon blowing after calcium treatment are adopted, and occluded foreign substance is controlled; and crystallizer cooling parameters and the sector section tightly-pressing-down amount and pressing-down mode are designed, therefore, casting blank center segregation is reduced, MnS inclusion forming is reduced, banded structures are eliminated or relieved, and therefore anti-acid anti-corrosion performance of products is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing an acid-resistant and corrosion-resistant pipeline steel slab by a chamfering crystallizer continuous casting machine. Background technique [0002] The main performance requirements of acid and corrosion resistant pipeline steel are HIC and SSC resistance. [0003] Hydrogen sulfide is a weakly acidic electrolyte, which mainly exists in the form of molecules in aqueous solutions with a pH of 1 to 5. Hydrogen sulfide reacts with metals: H 2 S+Fe→FeS+2H generates atomic hydrogen, H 2 S acts as a poisoning agent for hydrogen to form hydrogen molecules, making atomic hydrogen easy to enter the steel matrix. The hydrogen atoms entering the steel reach the defect through diffusion, and precipitate into hydrogen molecules, resulting in high pressure. When stress exists, under the action of tensile stress (external or residual), hydrogen is enrich...

Claims

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Application Information

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IPC IPC(8): B22D11/043B22D11/055C21C7/064C21C7/10C21C7/00
CPCB22D11/043B22D11/055C21C7/0006C21C7/064C21C7/10Y02P10/20
Inventor 刘国庆朱坦华李杰柳风林唐笑宇许韬江长军赵艳玲
Owner HANDAN IRON & STEEL GROUP
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