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Production method of hot rolled wire rod for ultra-low carbon steel fiber

A technology for ultra-low carbon steel and hot-rolled wire rod, which is applied in the field of metallurgical steelmaking and can solve the problems of unstable control of rolling temperature and water cooling after rolling, which will affect the uniformity of the hot-rolled wire rod and the drawing performance. , to improve the mechanical and welding properties, the grain is not easy to grow, and the heat resistance and corrosion resistance are improved.

Inactive Publication Date: 2020-09-22
张家港联峰钢铁研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Downstream users require good drawing properties for the ultra-low carbon steel fiber wire rods they use. Unstable rolling temperature and post-rolling water cooling control will affect the microstructure uniformity and drawing properties of hot-rolled wire rods

Method used

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  • Production method of hot rolled wire rod for ultra-low carbon steel fiber
  • Production method of hot rolled wire rod for ultra-low carbon steel fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Continuous casting: The molten iron is successively cast into slabs after desulfurization treatment, top-bottom combined blowing converter smelting, LF furnace refining and RH vacuum refining; the chemical components and mass percentages in the slabs are: C 0.02wt. %, Si 0.05wt.%, Mn 0.22wt.%, S 0.01wt.%, P 0.015wt.%, B 0.007wt.%, Cr 0.05wt.%, Ni 0.1wt.%, Cu 0.08wt.%, Al 0.01wt.%; Nb 0.02wt.%; the rest is iron and unavoidable impurities.

[0024] (2) pile cooling: the steel billet of step 1 gained is piled up in dry sheltered place, naturally cools in air;

[0025] (3) Heating process: the preheating temperature of the heating furnace is 890°C, heated to 950°C, and kept for 250min;

[0026] (4) Continuous rolling process: adopt low temperature final rolling, the temperature is 980 ℃;

[0027] (5) Silk spinning process: the wire rod is pinched and spinned by pinch rollers with grooves, and the spinning temperature is 900°C;

[0028] (6) Cooling process: the phase ...

Embodiment 2

[0030] (1) Continuous casting: The molten iron is successively cast into steel slabs after desulfurization treatment, top-bottom combined blowing converter smelting, LF furnace refining and RH vacuum refining; the chemical components and mass percentages in the steel slabs are: C 0.03wt. %, Si 0.08wt.%, Mn 0.35wt.%, S 0.008wt.%, P 0.010wt.%, B 0.009wt.%, Cr 0.06wt.%, Ni0.08wt.%, Cu 0.05wt.%, Al 0.007wt.%; Nb 0.05wt.%; the rest is iron and unavoidable impurities.

[0031] (2) pile cooling: the steel billet of step 1 gained is piled up in dry sheltered place, naturally cools in air;

[0032] (3) Heating process: the preheating temperature of the heating furnace is 950°C, heated to 1030°C, and kept for 240min;

[0033] (4) Continuous rolling process: adopt low temperature final rolling, the temperature is 1000 ℃;

[0034] (5) Silk spinning process: the wire rod is pinched and spinned by pinch rollers with grooves, and the spinning temperature is 910°C;

[0035] (6) Cooling pro...

Embodiment 3

[0037] (1) Continuous casting: The molten iron is successively cast into slabs after desulfurization treatment, top-bottom combined blowing converter smelting, LF furnace refining and RH vacuum refining; the chemical components and mass percentages in the slabs are: C 0.04wt. %, Si 0.03wt.%, Mn 0.30wt.%, S 0.005wt.%, P 0.012wt.%, B 0.008wt.%, Cr 0.08wt.%, Ni0.06wt.%, Cu 0.04wt.%, Al 0.009wt.%; Nb 0.03wt.%; the rest is iron and unavoidable impurities.

[0038] (2) pile cooling: the steel billet of step 1 gained is piled up in dry sheltered place, naturally cools in air;

[0039] (3) Heating process: the preheating temperature of the heating furnace is 900°C, heated to 1000°C, and kept for 245min;

[0040] (4) Continuous rolling process: adopt low temperature final rolling, the temperature is 990 ℃;

[0041] (5) Silk spinning process: the wire rod is pinched and spinned by pinch rollers with grooves, and the spinning temperature is 920°C;

[0042] (6) Cooling process: the pha...

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Abstract

The invention relates to the field of metallurgical steel making production, and particularly relates to a production method of hot rolled wire rod for ultra-low carbon steel fiber. The method comprises the steps in turn of molten iron preprocessing, smelting in a converter and LF refining, heap cooling, heating, tandem rolling, spinning, and cooling. The resulting product is prepared from the components in percentage by weight: C <= 0.05%, Si <= 0.10%, Mn: 0.22-0.35%, S <= 0.01%, P <= 0.015%, B: 0.007-0.009%, Cr <= 0.1%, Ni <= 0.1%, Cu <= 0.1%, Al <= 0.01%, Nb: 0.02-0.05%, and the balance ofFe and other unavoidable impurities. The product diameter is 5.5~6.5mm; and the out-of-roundness is less than or equal to 0.30mm. The surface of wire rod is smooth without any harmful defects such ascrack, fold, ear, scar, delamination and inclusion. The coil shape of the wire rod is flat, without the defects which affect the quality of wire setting and drawing such as multi-head, tangled wire, bending and pressing into coils and rubbing. After testing mechanical properties, the tensile strength is 330-380MPa, the reduction of area is greater than or equal to 75%, and the elongation after fracture is greater than or equal to 22%.

Description

technical field [0001] The invention belongs to the field of metallurgical steelmaking production, and in particular relates to a production method of a hot-rolled wire rod for ultra-low carbon steel fibers. Background technique [0002] Steel fiber is mainly used to make steel fiber concrete, which is added to strengthen mortar or concrete. Steel fiber produced by any method can play a role in strengthening concrete. The compressive strength, tensile strength, flexural strength, impact strength, toughness, impact toughness and other properties of concrete added with steel fibers have been greatly improved. [0003] Steel fibers refer to fibers with a length-to-diameter ratio of 40 to 80 made by cutting thin steel wires, cold-rolled strip shearing, ingot milling, or rapid condensation of molten steel; the length-to-diameter ratio refers to the ratio of the fiber length to its diameter. When the cross-section is non-circular, use the diameter converted to the equivalent cros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/16C22C38/06C22C38/12C22C38/32C22C38/20C22C38/26C22C38/54C22C38/42C22C38/48C21D8/06
CPCC21D8/065C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/20C22C38/26C22C38/32C22C38/42C22C38/48C22C38/54
Inventor 赵小军谷杰石晨敏
Owner 张家港联峰钢铁研究所有限公司
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