Formula and preparation method of smelting q345b steel with low cost and high quality

A Q345B, high-quality technology, applied in the formulation of low-cost and high-quality smelting Q345B steel and its preparation field, can solve problems such as high cost and billet segregation, and achieve the effects of reducing smelting cost, improving strength, improving quality and output

Active Publication Date: 2019-01-18
河北中重冷轧材料有限公司
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Problems solved by technology

[0004] The invention provides a low-cost and high-quality smelting Q345B steel formula and its preparation method to solve the problems of high cost and high Mn content in the prior art that cause severe segregation of the billet

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Embodiment Construction

[0009] A low-cost and high-quality formula for smelting Q345B steel. The raw materials are iron ore, silicon-manganese alloy Si15Mn65, titanium-iron alloy 50TiFe and aluminum alloy Al99, and the weight of silicon-manganese alloy Si15Mn65 per ton of Q345B steel is 6.6kg-9.6kg; The quality of titanium-iron alloy 50TiFe added to Q345B steel is 0.6kg-0.9kg per ton; the quality of aluminum alloy Al99 added to Q345B steel is 1.69kg.

[0010] The preparation method of the above-mentioned low-cost and high-quality smelted Q345B steel uses titanium alloy and aluminum alloy to replace part of the Mn to strengthen the grains to increase the strength and reduce the segregation caused by the high-Mn steel. Add silicon-manganese alloy Si15Mn65, titanium-iron alloy 50TiFe, and aluminum alloy Al99 in the feeding method of strength and strength, and add all the alloys when the steel is tapped to 1 / 2. The ingredients are guaranteed to meet the national standard GB / T1591-2008.

[0011] In the p...

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Abstract

The invention relates to a low-cost and high-quality formula of smelting Q345B steel and a preparation method of the formula. Raw materials comprise iron ores, silicon-manganese alloys Si15Mn65, ferrotitanium alloys 50TiFe and aluminum alloys Al99. 6.6kg-9.6kg of silicon-manganese alloys Si15Mn65 are added into each ton of Q345B steel, 0.6kg-0.9kg of ferrotitanium alloys 50TiFe are added into each ton of Q345B steel, and 1.69kg of aluminum alloys Al99 are added into each ton of Q345B steel. The titanium alloys and the aluminum alloys are used for replacing parts of Mn reinforced crystal grains to improve strength, segregation caused by high Mn steel is decreased, smelting cost is reduced, cast billet quality is ensured, and the quality and the yield of the Q345B steel are greatly improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a formula for smelting Q345B steel with low cost and high quality and a preparation method thereof. Background technique [0002] Q345 is a steel material. It is a low-carbon alloy steel (c<0.2%), with good comprehensive performance, good low temperature performance, cold stamping performance, good welding performance and machinability. Widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. [0003] The national standard GB / T1591-2008 stipulates the chemical composition and performance requirements of Q345B steel, C:≤0.20%, Si:≤0.50%, Mn≤1.70%, P≤0.035%, S≤0.035%, V+Nb+Ti≤ 0.15%. Performance requirements: yield strength 345MPa, tensile strength 510-630Mpa, elongation ≥ 21%. Composition control commonly used in the industry: C 0.13-0.19%, Si 0.35-0.45%, Mn 1.35-1.45%, The corresponding added alloy is about 17kg / t steel for SiMn alloy, 5kg / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06
CPCC22C33/006C22C33/06
Inventor 李首虎金文生常根岭张义春李玉强常志周冯帅帅
Owner 河北中重冷轧材料有限公司
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