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Steel for sulfur-resistant gas cylinder pipe and manufacturing method of steel

A technology for sulfur gas cylinders and tubes, which is applied in the field of alloy structural steel, can solve the problems of insufficient grain refinement, poor corrosion resistance of gas cylinders, and low service life, and achieve the effects of high purity, increased gas storage capacity, and high strength and toughness

Active Publication Date: 2019-05-24
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to ensure the low-temperature impact toughness of the gas cylinders produced by this steel, the strength cannot be improved, resulting in large wall thickness and low carrying efficiency; due to the failure to effectively control sulfides, the grain refinement is not enough, resulting in poor corrosion resistance of the gas cylinders. Low service life and high comprehensive use cost

Method used

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  • Steel for sulfur-resistant gas cylinder pipe and manufacturing method of steel
  • Steel for sulfur-resistant gas cylinder pipe and manufacturing method of steel
  • Steel for sulfur-resistant gas cylinder pipe and manufacturing method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The present embodiment adopts the following production technology to prepare:

[0053] 1) KR desulfurization: KR desulfurization method is adopted, the molten iron is stirred in the molten iron ladle to form a vortex, and the self-made desulfurization agent is put into the vortex to make the desulfurization agent fully react with the sulfur in the molten iron, and then the desulfurization products are removed by thorough slag removal, and the molten iron is reduced. S content, to ensure that the molten iron S is less than or equal to 0.002% after desulfurization;

[0054] 2) Converter smelting: smelting in a top-bottom double blowing converter with a capacity of more than 100 tons, using molten iron and high-quality scrap steel as raw materials for primary smelting to achieve pre-p removal, adding lime, synthetic refining slag and various high-purity alloys for tapping. Pre-deoxidation and initial adjustment of components, using slag blocking cone and sliding plate for ...

Embodiment 2

[0062] The present embodiment adopts the following production technology to prepare:

[0063] 1) KR desulfurization: KR desulfurization method is adopted, the molten iron is stirred in the molten iron ladle to form a vortex, and the self-made desulfurization agent is put into the vortex to make the desulfurization agent fully react with the sulfur in the molten iron, and then the desulfurization products are removed by thorough slag removal, and the molten iron is reduced. S content, to ensure that the molten iron S is less than or equal to 0.002% after desulfurization;

[0064] 2) Converter smelting: smelting in a top-bottom double blowing converter with a capacity of more than 100 tons, using molten iron and high-quality scrap steel as raw materials for primary smelting to achieve pre-p removal, adding lime, synthetic refining slag and various high-purity alloys for tapping. Pre-deoxidation and initial adjustment of components, using slag blocking cone and sliding plate for ...

Embodiment 3

[0072] The present embodiment adopts the following production technology to prepare:

[0073] 1) KR desulfurization: KR desulfurization method is adopted, the molten iron is stirred in the molten iron ladle to form a vortex, and the self-made desulfurization agent is put into the vortex to make the desulfurization agent fully react with the sulfur in the molten iron, and then the desulfurization products are removed by thorough slag removal, and the molten iron is reduced. S content, to ensure that the molten iron S is less than or equal to 0.002% after desulfurization;

[0074]2) Converter smelting: smelting in a top-bottom double blowing converter with a capacity of more than 100 tons, using molten iron and high-quality scrap steel as raw materials for primary smelting to achieve pre-p removal, adding lime, synthetic refining slag and various high-purity alloys for tapping. Pre-deoxidation and initial adjustment of components, using slag blocking cone and sliding plate for c...

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Abstract

The invention discloses steel for a sulfur-resistant gas cylinder pipe. The steel is prepared from the chemical components in percentage by mass: 0.29%-0.31% of C, 0.20%-0.30% of Si, 0.80%-0.90% of Mn, 1.00%-1.10% of Cr, 0.25%-0.30% of Mo, 0.15%-0.20% of Ni, 0.025%-0.035% of Nb, 0.08%-0.10% of V, less than or equal to 0.015% of P, less than or equal to 0.002% of S, less than or equal to 0.015% ofP+S, less than or equal to 0.008% of As, less than or equal to 0.005% of Sn, less than or equal to 0.005% of Pb, less than or equal to 0.005% of Sb, less than or equal to 0.005% of Bi, less than or equal to 0.00015% of [H], less than or equal to 0.0015% of [O], less than or equal to 0.0050% of [N] and the balance of Fe. Through the components, it can be known that according to the steel for the sulfur-resistant gas cylinder pipe, alloying is conducted through the conventional alloy elements of C, Si, Mn, Cr, Mo and the like, micro alloying is conducted by adding the small amount of V, Ni and Nb, and thus the steel has higher toughness than that of 30CrMo in the standard of the national 'large-volume steel seamless gas cylinder' (GB / T 33145-2016).

Description

technical field [0001] The invention relates to alloy structural steel in the iron and steel industry, in particular to a sulfur-resistant gas cylinder pipe and a manufacturing method thereof. Background technique [0002] Environmental protection is my country's basic national policy. In order to integrate the scattered ecological and environmental protection responsibilities, uniformly exercise ecological and pollution discharge supervision and administrative law enforcement responsibilities, strengthen environmental pollution control, and ensure national ecological security. With the start of the national "Blue Sky Defense War", the development of energy saving, emission reduction and low carbon in the production link has been comprehensively promoted to energy saving, emission reduction and consumption reduction in the field of life. The promotion of "coal-to-gas" and natural gas new energy vehicles has reduced the consumption of coal and oil and reduced environmental p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/46C21C1/02C21C7/064C21C7/06C21C7/10C21C5/35C22C33/04B22D11/115
Inventor 左辉翟万里石可伟张洪才郑力宁肖波许光乐
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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