A continuous casting method for eliminating dendrite band segregation near the surface of alloy spring steel wire rod

A technology of banded segregation and spring steel, which is applied in the field of metallurgy, can solve problems such as dendrite banded segregation defect and product change judgment, and achieve the elimination of severe dendrite banded segregation, uniform surface metallographic structure, and improved The effect of fatigue performance

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A technology of banded segregation and spring steel, which is applied in the field of metallurgy, can solve problems such as dendrite banded segregation defect and product change judgment, and achieve the elimination of severe dendrite banded segregation, uniform surface metallographic structure, and improved The effect of fatigue performance

CN110508771BActive Publication Date: 2021-05-28XINGTAI IRON & STEEL

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Embodiment 1

[0023] In this embodiment, the alloy spring steel wire rod steel grade is 55SiCrV, and the continuous casting method for eliminating the near-surface dendrite band segregation of the alloy spring steel wire rod includes the control of the superheat of molten steel in the continuous casting tundish, the control of the casting speed of the continuous casting slab, and the crystallizer. Electromagnetic stirring control, crystallizer water flow control and crystallizer vibration parameter control process, the specific process steps are as follows:

[0024] (1) Control of the superheat of molten steel in the continuous casting tundish: control the superheat of molten steel in the tundish at 15-18°C through the electromagnetic induction heating equipment of the tundish;

[0025] (2) Continuous casting slab casting speed control: the cross-sectional size of the crystallizer is 280mm×325mm, and the continuous casting slab casting speed is controlled at 0.65m / min;

[0026] (3) Electrom...

Embodiment 2

[0032] In this embodiment, the alloy spring steel wire rod steel grade is 55SiCr, and the continuous casting method for eliminating the dendrite band segregation near the surface of the alloy spring steel wire rod includes the control of the superheat of molten steel in the continuous casting tundish, the control of the casting speed of the continuous casting slab, and the crystallizer. Electromagnetic stirring control, crystallizer water flow control and crystallizer vibration parameter control process, the specific process steps are as follows:

[0033] (1) Control of the superheat of molten steel in the continuous casting tundish: control the superheat of molten steel in the tundish at 22-25°C through the electromagnetic induction heating equipment of the tundish;

[0034] (2) Continuous casting slab casting speed control: the cross-sectional size of the crystallizer is 280mm×325mm, and the continuous casting slab casting speed is controlled at 0.65m / min;

[0035] (3) Mold ...

Embodiment 3

[0041] In this embodiment, the alloy spring steel wire rod steel grade is 60Si2Mn, and the continuous casting method for eliminating the near-surface dendrite band segregation of the alloy spring steel wire rod includes the control of the superheat of molten steel in the continuous casting tundish, the control of the casting speed of the continuous casting slab, and the crystallizer. Electromagnetic stirring control, crystallizer water flow control and crystallizer vibration parameter control process, the specific process steps are as follows:

[0042] (1) Control of the superheat of molten steel in the continuous casting tundish: control the superheat of molten steel in the tundish at 19-22°C through the electromagnetic induction heating equipment of the tundish;

[0043] (2) Continuous casting slab casting speed control: the cross-sectional size of the crystallizer is 280mm×325mm, and the continuous casting slab casting speed is controlled at 0.65m / min;

[0044] (3) Mold ele...

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Abstract

The invention discloses a continuous casting method for eliminating dendrite strip segregation near the surface of an alloy spring steel wire rod. The method comprises the control of the superheat degree of molten steel in a continuous casting tundish, the control of the casting speed of a continuous casting slab, and the control of electromagnetic stirring in a crystallizer. , crystallizer water flow control and vibration parameter control process; the superheat of molten steel in the tundish is controlled at 15-25°C through the electromagnetic induction heating equipment of the tundish; 150~300A, frequency 1.5~2.5Hz; adopt hydraulic vibration, amplitude 2.3~2.7mm, vibration frequency 100~130cpm, liquid level fluctuation is controlled within ±2mm. The φ5.5-20mm alloy spring steel wire rod produced by the continuous casting method of the present invention has no near-surface dendrite band segregation through dendrite corrosion detection, and the surface layer metallographic structure is uniform after heat treatment, effectively preventing the dendrite band segregation caused by dendrite band segregation. Early fatigue fracture of the spring.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a continuous casting method for eliminating dendrite band segregation near the surface of an alloy spring steel wire rod. Background technique [0002] Alloy spring steel hot-rolled wire rod is mainly used to manufacture automobile suspension springs, clutch springs, valve springs and die springs, mainly including 55SiCr, 55SiCrV, 60Si2Mn and other grades. Spring steel hot-rolled wire rods must at least go through drawing, heat treatment, coiling and other processing processes before they can become final springs. If the wire rod has a certain degree of macrosegregation defects, it may cause the steel wire to break after drawing. The mechanical properties of the steel wire after heat treatment Unevenness, unstable dimensions of the rolled out spring, and even early fatigue fracture of the spring. [0003] Dendrite banded segregation of spring steel refers to the f...

Claims

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Application Information

Patent Timeline

28 May 2021

Publication

CN110508771B

IPC: B22D11/16; B22D11/18; B22D11/115; B22D11/22; G01N33/204; G01N1/32

CPC: B22D11/115; B22D11/166; B22D11/18; B22D11/22; G01N1/32; G01N33/204

Inventors: 孟耀青; 田新中