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Method for smelting high-strength wear-resisting steel

A technology of high-strength wear-resistant steel and refining process, which is applied in the field of smelting high-strength wear-resistant steel and wear-resistant steel. It can solve the problems of no control measures for smelting process and achieve good quality of continuous casting billet and stable carbon content. The effect of controlling and stabilizing production

Inactive Publication Date: 2015-12-23
SHOUGANG CORPORATION
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  • Abstract
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Problems solved by technology

[0003] The Chinese patent with the application number CN103205651 discloses an online quenching production method of low-cost high-strength wear-resistant steel plate. cleanliness, non-metallic inclusions and center segregation and other smelting process requirements, no corresponding smelting process control measures
[0004] According to the relevant patent search of domestic wear-resistant steel, the current patent of wear-resistant steel only proposes the technical control of composition design and related heat treatment process, while for the technical measures of smelting process of wear-resistant steel, such as composition control, non-metallic inclusions, etc. Material control, continuous casting slab quality control technology, etc. do not have clear requirements. Based on the above reasons, the present invention provides a method for smelting high-strength wear-resistant steel

Method used

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Embodiment 1

[0014] For steel grade NM400, the process route adopted is: molten iron pretreatment→converter smelting→LF refining→RH refining→continuous casting.

[0015] 1) Carbon content control: the carbon content at the end of the converter is 0.065%; the LF refining process is controlled to increase C by 0.04%, and the RH refining process uses C powder to adjust C, and the final carbon content of the finished product is 0.18%;

[0016] 2) Sulfur content control: [S] in molten iron after pretreatment is 0.0050%; sulfur content [S] in converter end point is 0.0095%; LF furnace refining controls slag oxidation (FeO+MnO) to 1.3%, slag alkali Degree(CaO) / (SiO 2 ) is 6, and the sulfur content in the steel after refining is 0.0035%.

[0017] 3) Hydrogen content control: control the moisture content of LF refining slag to 0.5%; control the processing time of RH vacuum refining under the condition of ≤100Pa deep vacuum for 15 minutes, and the hydrogen content in the steel after vacuum refining...

Embodiment 2

[0021] The steel grade NM450 adopts the following process route: hot metal pretreatment→converter smelting→LF refining→RH refining→continuous casting.

[0022] 1) Carbon content control: the carbon content at the end of the converter is 0.08%; the LF refining process is controlled to increase C by 0.04%, and the RH refining process uses C powder to adjust C, and the final carbon content of the finished product is 0.25%;

[0023] 2) Sulfur content control: [S] in molten iron after pretreatment is 0.0050%; sulfur content [S] in converter end point is 0.0092%; LF furnace refining controls slag oxidation (FeO+MnO) to 1.0%, slag alkali Degree(CaO) / (SiO 2 ) is 7, and the sulfur content in the steel after refining is 0.0025%.

[0024] 3) Hydrogen content control: control the moisture content of LF refining slag to 0.5%; control the processing time of RH vacuum refining under the condition of ≤100Pa deep vacuum for 18 minutes, and the hydrogen content in the steel after vacuum refini...

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Abstract

The invention discloses a method for smelting high-strength wear-resisting steel, and belongs to the technical field of medium-thickness plate steel-making. The process comprises the following steps: molten steel pretreatment, treatment in a converter, LF refining, RH refining and plate blank continuous casting. The method has the advantage that the process is adopted to realize requirements of carbon content stable control, low sulfur, low-hydrogen content and good continuous-casting billet quality of rear-resisting steel, i.e., meet the requirements of controlling carbon content of a finished product to 0.15%-0.30%, wherein sulfur [S] content is less than or equal to 0.0050%, low-hydrogen content [H] is less than or equal to 0.0002%, grade for various impurities is controlled to be lower than or equal to 2.0, and segregation level of a continuous-casting center is lower than or equal to class-C 1.5; and industrial, large-scale and stable production for the wear-resisting steel is realized.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate steelmaking, and in particular provides a method for smelting high-strength wear-resistant steel, especially the smelting of wear-resistant steel with a Brinell hardness greater than 450HB. Background technique [0002] High-strength wear-resistant steel is widely used as wear-resistant materials in various wear conditions, so it must have good plasticity, toughness, and good bending and welding properties while meeting high strength. Wear failure is the failure mode of wear-resistant steel. Improving the cleanliness and uniformity of wear-resistant steel is one of the key technologies to ensure the above performance and delay wear failure. Therefore, in the production process of wear-resistant steel, requirements are put forward for the smelting link. High cleanliness, low content of impurity elements such as phosphorus, sulfur and hydrogen, control of the number and size of non-me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C5/28C21C7/10C21C7/076
CPCY02P10/20
Inventor 初仁生刘金刚李战军顾林豪郝宁马长文
Owner SHOUGANG CORPORATION
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