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Low-cost low alloy steel coil and manufacturing method thereof

A low-alloy steel and a manufacturing method technology, which are applied to the low-cost low-alloy steel coil and the manufacturing field thereof, can solve the problem of high production cost, and achieve the effects of reducing alloy cost, saving labor cost, and avoiding corner cracks.

Active Publication Date: 2020-11-27
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantage that the existing low-alloy steel coils are usually produced by adding expensive alloying elements such as Nb and V to improve the toughness and toughness of the obtained steel coil products, resulting in relatively high production costs. A low-cost low-alloy steel coil and its manufacturing method

Method used

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  • Low-cost low alloy steel coil and manufacturing method thereof
  • Low-cost low alloy steel coil and manufacturing method thereof
  • Low-cost low alloy steel coil and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A low-cost low-alloy steel coil in this embodiment, its chemical composition and its mass percentage are: C: 0.07%; Mn: 0.60%; P: 0.005%; S: 0.004%; Ti: 0.05%; Al: 0.045%; N: 0.0040%; O: 0.0020%, the rest is Fe and unavoidable impurities. Its composition content satisfies the formula 0.024≤Ti-3.42N-1.5S≤0.034, and its thickness satisfies the formula H≤23-85.7C+1.43Mn-119Ti.

[0061] The specific manufacturing process of the low-alloy steel coil is as follows: add 38 tons of self-circulating scrap steel, and add 286 tons of molten iron. In the later stage of converter blowing, the strong bottom blowing mode is adopted to strengthen the stirring of the molten pool; the amount of slag discharged by the converter is strictly controlled. The feeding sequence in the tapping process is: pre-deoxidized carbon powder-aluminum particles-medium carbon ferromanganese-slag material; the end temperature of the converter is 1640°C.

[0062] Refining outside the RH furnace adopts the...

Embodiment 2

[0068] A low-cost low-alloy steel coil in this embodiment, its chemical composition and its mass percentage are: C: 0.08%; Mn: 0.80%; P: 0.015%; S: 0.008%; Ti: 0.045%; Al: 0.04%; N: 0.0010%; O: 0.0030%, and the rest are Fe and unavoidable impurities. Its component content satisfies the formula 0.024≤Ti-3.42N-1.5S≤0.034, and its thickness H≤23-85.7C+1.43Mn-119Ti.

[0069] The specific manufacturing process of the low-alloy steel coil is: add 39 tons of self-circulating scrap steel, and add 280 tons of molten iron. In the later stage of converter blowing, the strong bottom blowing mode is adopted to strengthen the stirring of the molten pool; the amount of slag discharged by the converter is strictly controlled. The feeding sequence in the tapping process is: pre-deoxidized carbon powder-aluminum particles-medium carbon ferromanganese-slag material; the end temperature of the converter is 1650°C.

[0070] Refining outside the RH furnace adopts the deep treatment mode, the vacu...

Embodiment 3

[0074] A low-cost low-alloy steel coil in this embodiment, its chemical composition and its mass percentage are: C: 0.07%; Mn: 0.50%; P: 0.009%; S: 0.007%; Ti: 0.06%; Al: 0.05%; N: 0.0020%; O: 0.0020%, and the rest are Fe and unavoidable impurities. Its composition content satisfies the formula 0.035≤Ti-3.42N-1.5S≤0.045, and its thickness satisfies the formula H≤23-85.7C+1.43Mn-119Ti.

[0075] The specific manufacturing process of the low-alloy steel coil is as follows: add 40 tons of self-circulating scrap steel, and add 290 tons of molten iron. In the later stage of converter blowing, the strong bottom blowing mode is adopted to strengthen the stirring of the molten pool; the amount of slag discharged by the converter is strictly controlled. The feeding sequence in the tapping process is: pre-deoxidized carbon powder-aluminum particles-medium carbon ferromanganese-slag material; the end temperature of the converter is 1660°C.

[0076] Refining outside the RH furnace adopts...

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Abstract

The invention discloses a low-cost low alloy steel coil and a manufacturing method thereof and belongs to the technical field of production of hot continuous rolled plates and strips. The chemical ingredients of the low-cost low alloy steel coil comprise, by mass percentage, 0.06%-0.08% of C, 0.50%-0.80% of Mn, not larger than 0.015% of P, not larger than 0.008% of S, 0.045%-0.075% of Ti, 0.04%-0.05% of Al, not larger than 0.004% of N, not larger than 0.0030% of O and the balance Fe and inevitable impurities. The manufacturing method comprises the step of converter smelting, the step of RH secondary refining, the step of continuous casting, heating and TMCP and the step of laminar cooling and coiling. By the adoption of the technical scheme, without the need for adding the expensive microalloying alloy elements such as Nb and V, the strength and toughness comprehensive performance of the obtained steel coil product can reach the same level of the existing microalloyed steel coil adopting Nb and V, and therefore the production cost is remarkably lowered. Meanwhile, the mechanical performance stability of the steel coil can be further improved, performance fluctuation is reduced, andproduction requirements can be well met.

Description

technical field [0001] The invention belongs to the technical field of hot continuous rolling strip production, and more specifically relates to a low-cost low-alloy steel coil and a manufacturing method thereof. Background technique [0002] Due to its moderate strength, good processability, and economical applicability, low-alloy steel is widely used in infrastructure construction such as automobiles, ships, bridges, and mechanical engineering. Traditional low-alloy steels are generally designed with C, Si, Mn solid solution elements and micro-alloyed elements such as Nb, V, Ti, etc., coupled with a suitable controlled rolling and controlled cooling process, mainly forming a solid solution strengthened, fine-grained steel. Strengthening and precipitation strengthening are steel coil products with good comprehensive properties of strength and toughness (such as yield strength and tensile strength, etc.). However, the prices of Mn, Nb, and V alloying elements are relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/14C21C7/10C21D8/02C22C33/04
CPCC22C38/04C22C38/06C22C38/14C22C33/04C21C7/10C21D8/0205C21D8/0226C21D8/0263
Inventor 毛鸣文亮卢学蕾张宇光王泉彭正波王飞张杨戴思源白丽杨孙夺亮石志仁范海宁张炯张立鑫
Owner MAANSHAN IRON & STEEL CO LTD
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