Production smelting method of saw blade steel

A smelting method and saw blade technology, which is applied in the production and smelting of saw blade steel and the field of saw blade steel smelting to achieve stable production and low hydrogen content.

Inactive Publication Date: 2015-12-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] According to the relevant patent search of domestic saw blade steel, the current patent of saw blade steel only proposes the technical control of composition design and related heat treatment process, while the technical measures for smelting process of saw blade steel, such as composition control, Material control, continuous casting slab quality control technology, etc. do not have clear requirements, based on the above reasons, the present invention provides a production and smelting method of saw blade steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] For steel grade 30Mn, the process route adopted is: hot metal pretreatment→ converter smelting→LF refining→RH refining→continuous casting.

[0016] 1) Carbon content control: The final carbon content of the converter is 0.10% by weight; the LF refining process uses C powder to adjust C, and the final product carbon content is 0.30% by weight;

[0017] 2) Sulfur content control: [S] in the molten iron after hot metal pretreatment is 0.0050% by weight; the sulfur content [S] at the end of the converter is 0.0092% by weight; LF furnace refining control slag oxidation (FeO+MnO) is 1.2%, Slag basicity (CaO) / (SiO 2 ) Is 5.5, and the sulfur content in the refined steel is 0.0023% by weight.

[0018] 3) Hydrogen content control: control the moisture content of the LF refining slag to 0.5% by weight; control the RH vacuum refining to a processing time of 15min under the condition of ≤100Pa deep vacuum, and the hydrogen content in the steel after the vacuum refining is 0.00015% by weigh...

Embodiment 2

[0022] For the steel grade 45Mn2V, the process route adopted is: hot metal pretreatment → converter smelting → LF refining → RH refining → continuous casting.

[0023] 1) Carbon content control: the final carbon content of the converter is 0.12% by weight; the LF refining process uses C powder to adjust C, and the final product carbon content is 0.45% by weight;

[0024] 2) Sulfur content control: [S] in the molten iron after hot metal pretreatment is 0.0050% by weight; the sulfur content [S] at the end of the converter is 0.010% by weight; LF furnace refining control slag oxidation (FeO+MnO) is 1.5% by weight , Slag basicity (CaO) / (SiO 2 ) Is 6.3, and the sulfur content in the steel after refining is 0.0020% by weight.

[0025] 3) Hydrogen content control: control the moisture content of the LF refining slag to 0.5% by weight; control the RH vacuum refining to a processing time of 15min under the condition of ≤100Pa deep vacuum, and the hydrogen content in the steel after the vacuum...

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Abstract

The invention discloses a production smelting method of saw blade steel, and belongs to the technical field of steelmaking. The process comprises pretreatment of molten iron-converter-LF refining-RH refining-continuous casting of slabs. The process has the following advantages: the process realizes the requirements of stable control of carbon content, low-sulfur and low-hydrogen contents and excellent continuous-cast slab quality of the saw blade steel: the requirement of the carbon content of final finished product in a range of 0.30-0.60 weight% is satisfied; the low sulfur content [S] is not more than 0.0030 weight%; the low-hydrogen content [H] is not more than 0.0002 weight%; the levels of various inclusions are controlled not more than 2.0; the center segregation grade of the continuous-cast slabs is not more than C type 1.5; and the industrial, large-batch and stable production of the saw blade steel is realized.

Description

Technical field [0001] The invention belongs to the technical field of steelmaking, and particularly relates to a production and smelting method of saw blade steel, which is suitable for smelting saw blade steel with a C content of 0.30% to 0.60% by weight in the production of medium and thick plates. Background technique [0002] In the production process of tubes, rods, profiles, and cold-formed steels (deep processed products of plates and strips), metallurgical saw blades are used for online cutting to complete the process requirements of removing the head and tail and setting the length. The metallurgical industry is generally large-scale continuous production, and the production efficiency and production volume are very high. The saw blades required to meet the online continuous production requirements. The saw blade steel must have good quality. Therefore, the smelting process is required in the production process of the saw blade steel. Put forward requirements, high clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/06C21C7/072
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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