Smelting process of hydrogen-induced cracking resistant vessel steel

A technology for anti-hydrogen-induced cracking and container steel, which is applied in the field of steelmaking, can solve problems such as not found, and achieve the effect of stable production

Active Publication Date: 2015-04-08
SHOUGANG CORPORATION
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  • Summary
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Problems solved by technology

[0007] Based on the above reasons, this patent proposes a smelting process of hydrogen-induced cracking-resistant container steel, which satisfies the i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1:

[0018] For steel grade Q245RHIC, the process route adopted is: hot metal pretreatment-converter smelting-LF refining-RH vacuum refining-continuous casting.

[0019] (1) Carbon content control: the final carbon content of the converter is 0.06%; the carbon increase in the LF refining process is controlled at 0.020%, and the carbon content of the finished product is 0.13%.

[0020] (2) Sulfur content control: [S] in the molten iron after hot metal pretreatment is 0.0050%; high-quality scrap and auxiliary materials are used for converter smelting, the sulfur content of scrap steel is controlled to 0.0040%, the sulfur content of the converter slagging material is 0.05%, and the sulfur at the end of the converter Content [S] is 0.0080%; LF furnace refining control slag oxidation (FeO+MnO) is 1.0%, slag basicity (CaO) / (SiO 2 )=6.0, the slag addition amount is 15kg / t steel, and the sulfur content in the steel after refining is 0.0010%.

[0021] (3) Hydrogen content contro...

Example Embodiment

[0025] Example 2:

[0026] For steel grade Q345RHIC, the process route adopted is: hot metal pretreatment-converter smelting-LF refining-RH vacuum refining-continuous casting.

[0027] (1) Carbon content control: the final carbon content of the converter is 0.08%; the carbon increase in the LF refining process is controlled at 0.02%, and the carbon content of the finished product is 0.16%.

[0028] (2) Sulfur content control: [S] in the molten iron after pretreatment of molten iron is 0.0040%; high-quality scrap and auxiliary materials are used for converter smelting, the sulfur content of scrap steel is controlled to 0.0030%, the sulfur content of the converter slagging material is 0.05%, and the sulfur at the end of the converter The content is 0.0060%; LF furnace refining control slag oxidation (FeO+MnO) is 0.6%, slag basicity (CaO) / (SiO 2 )=8.0, the slag addition amount is 12kg / t steel, and the sulfur content in the steel is 0.0008% after refining.

[0029] (3) Hydrogen content co...

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Abstract

The invention discloses a smelting process of hydrogen-induced cracking resistant vessel steel, and belongs to the technical field of steelmaking. The process route is molten iron pretreatment, converter smelting, ladle furnace refining, RH vacuum refining and continuous casting. The process has the characteristics that key factors for affecting the hydrogen-induced cracking resistance of the vessel steel are successfully controlled through control on various links of in the smelting process; according to the final product, the target carbon content is stably controlled at +/-0.01%; the super-low sulfur content [S] is smaller than or equal to 0.0010%; the low-hydrogen content [H] is smaller than or equal to 1.5ppm; the rating control of various occluded foreign substances is smaller than or equal to 0.5; and the center segregation level of a continuously cast bloom is not higher than class C 1.0. The smelting process has the advantages that smelting of the hydrogen-induced cracking resistant vessel steel is achieved; the target carbon content is stably controlled at +/-0.01%; the super-low sulfur content [S] is smaller than or equal to 0.0010%; the low-hydrogen content [H] is smaller than or equal to 1.5ppm; the rating control of various occluded foreign substances is smaller than or equal to 0.5; the center segregation level of a continuously cast bloom is not higher than class C 1.0; according to a steel plate rolled by a casting blank, the hydrogen-induced cracking resistance is qualified in detection by virtue of an NACE standard; and industrialized, massive and stable production of the hydrogen-induced cracking resistant vessel steel is achieved.

Description

Technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a smelting process for hydrogen-induced cracking container steel, especially for smelting medium-carbon, ultra-low sulfur, low hydrogen content and good continuous casting billet quality container steel to meet hydrogen-induced cracking resistance Requirements. Background technique [0002] With the development of the domestic oil and natural gas industry, the amount of container steel used for oil and gas storage is increasing, and hydrogen sulfide is ubiquitous in oil and natural gas. Therefore, container steel is prone to hydrogen-induced cracking (HIC) damage in the environment where hydrogen sulfide is used. . Hydrogen-induced cracking of container steel is the infiltration of hydrogen atoms generated by corrosion in the stored oil and gas into the steel, and they accumulate locally, such as inclusions or grain boundaries, to form hydrogen blasting, thereby initi...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/10B22D11/16
CPCY02P10/20
Inventor 李战军刘金刚初仁生邹扬王东柱白占禄王森郝珊李广双郝宁陈霞王卫华
Owner SHOUGANG CORPORATION
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