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Aluminiferous low-carbon cold heading wire rod steel and production method thereof

A technology of cold heading and wire rod, applied in workpiece surface treatment equipment, metal rolling, manufacturing tools, etc., can solve the problems of unfavorable steel full phase transformation, reduced drawing and cold heading performance, and high spinning temperature

Inactive Publication Date: 2009-08-26
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After analysis, the deficiencies in literature [1] and literature [2] are: the spinning temperature is too high, which is not conducive to the reduction of scale; the roll speed used in literature [2] is too high, which is not conducive to the full Phase transformation, full growth of ferrite, reduces the drawing and cold heading properties of steel

Method used

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  • Aluminiferous low-carbon cold heading wire rod steel and production method thereof

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Effect test

Embodiment 1

[0026] A kind of aluminum-containing low-carbon cold heading wire rod steel, its chemical composition and weight percentage are: C: 0.04, Si: 0.01, Mn: 0.35, P: 0.03, S: 0.035, Als: 0.02, the rest is Fe and not Avoid impurities.

[0027] A method for producing aluminum-containing low-carbon cold heading wire rod steel, the steps of which are:

[0028] 1) Heat the continuous casting slab to 950°C, and the cross-sectional temperature difference is 30°C;

[0029] 2) Rolling: the starting rolling temperature is controlled at 900°C, and the final rolling temperature is controlled at 950°C;

[0030] 3) Spin silk after water cooling, and its spinning temperature is controlled at 880°C;

[0031] 4) Cool to 615°C after spinning, and the cooling rate is controlled at 0.7°C / sec.

Embodiment 2

[0033] A kind of aluminum-containing low-carbon cold heading wire rod steel, its chemical composition and weight percentage are: C: 0.051, Si: 0.02, Mn: 0.40, P: 0.025, S: 0.032, Als: 0.028, the rest is Fe and not Avoid impurities.

[0034] A method for producing aluminum-containing low-carbon cold heading wire rod steel, the steps of which are:

[0035] 1) Heat the continuous casting slab to 980°C, and the cross-sectional temperature difference is 28°C;

[0036] 2) Rolling: the starting rolling temperature is controlled at 930°C, and the final rolling temperature is controlled at 960°C;

[0037] 3) Spin silk after water cooling, and its spinning temperature is controlled at 886°C;

[0038] 4) Cool to 630°C after spinning, and control the cooling rate at 0.8°C / sec.

Embodiment 3

[0040] A kind of aluminum-containing low-carbon cold heading wire rod steel, its chemical composition and weight percentage are: C: 0.060, Si: 0.032, Mn: 0.45, P: 0.020, S: 0.028, Als: 0.035, the rest is Fe and not Avoid impurities.

[0041] A method for producing aluminum-containing low-carbon cold heading wire rod steel, the steps of which are:

[0042] 1) Heating the continuous casting slab to 1000°C with a cross-sectional temperature difference of 20°C;

[0043] 2) Rolling: the starting rolling temperature is controlled at 950°C, and the finishing rolling temperature is controlled at 970°C;

[0044] 3) spinning after water cooling, the spinning temperature is controlled at 890°C;

[0045] 4) Cool to 650°C after spinning, and control the cooling rate at 0.9°C / sec.

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Abstract

The invention relates to a wire rod steel and a production method thereof, aiming at overcoming the defect that at present, spinning has overhigh temperature, so as not to be beneficial to reducing iron scale or adopting overhigh roller speed as well as full phase transition of the steel and growing up of ferrite, thus reducing the properties of drawing and cold heading of steel. The measurement is that the aluminiferous low-carbon cold heading wire rod steel has the chemical components based on the weight percentage: 0.04-0.08% of C, 0.01-0.05% of Si, 0.35-0.55% of Mn, less than or equal to 0.030% of P, less than or equal to 0.035% of S, 0.02-0.06% of Als and the rest of Fe and unavoidable impurity. The technique is that continuously cast bloom is heated up to 950-1040 DEG C with the section temperature being less than or equal to 30 DEG C; the start rolling temperature is 900-1000 DEG C, and the finishing temperature is 950-990 DEG C; after the water is cooled, the spinning is at 880-900 DEG C; when the spinning is cooled to 615-680 DEG C, the cooling velocity is 0.7-1.1DEG / s. The invention ensures the mechanical property, microscopic constitution, surface quality and cold heading property to reach the requirements of the user.

Description

technical field [0001] The invention relates to wire rod steel and a production method thereof, in particular to aluminum-containing cold heading wire rod steel and a production method thereof. Background technique [0002] Cold heading wire rod steel belongs to low carbon cold heading steel, which is mainly used to manufacture bolts, studs, screws, nuts, self-tapping screws, pins, rivets and other fastener products, so the wire rod is required to have high plasticity Indicators, reduction of area and elongation; the deformation resistance of the material is required to be small, the work hardening rate is low, and the σ of the material is s / σ b The value is small; the wire rod is required to have good surface quality and smoothness, and surface defects such as folds and cracks are not allowed; the structure of the steel is dense and has no internal defects. At present, the rolling speed of high-speed wire has exceeded 100 m / s. The increase in rolling speed will lead to a...

Claims

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Application Information

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IPC IPC(8): C22C38/06B21B1/16B21B37/74B21B45/02
Inventor 帅习元桂美文周勇罗德信毛国运赵隆崎
Owner 武钢集团有限公司
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