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A kind of boron-containing high-strength annealing-free fastener steel wire rod and its preparation method

A high-strength, fastener technology, applied in the field of materials, can solve the problems of plastic toughness and processing deformation ability that cannot meet the market demand, and achieve the effect of reducing processing procedures and steel consumption, improving the deformation ability of upsetting and increasing the strength.

Active Publication Date: 2017-04-05
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plastic toughness and processing deformation ability of the existing boron-containing high-strength fastener steel can not meet the market demand, therefore, it is very necessary to develop a product that can solve the above problems

Method used

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  • A kind of boron-containing high-strength annealing-free fastener steel wire rod and its preparation method
  • A kind of boron-containing high-strength annealing-free fastener steel wire rod and its preparation method
  • A kind of boron-containing high-strength annealing-free fastener steel wire rod and its preparation method

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Experimental program
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Effect test

preparation example Construction

[0025] The preparation method of the boron-containing high-strength annealing-free fastener steel wire rod according to the present invention is characterized in that it comprises the following steps:

[0026] A. Hot metal pretreatment desulfurization: the chemical composition C 4.5~5.0wt%, Si 0.30~0.50wt%, Mn 0.25~0.50wt%, P 0.090~0.110wt%, S≤0.020wt%, the rest is Fe and unavoidable The blast furnace molten iron with impurities is transported to the KR method molten iron pretreatment device for desulfurization treatment. The insertion depth of the stirring head is controlled at 2200~2400mm, according to 15.0~17.0kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C 4.5~4.8wt%, Si ...

Embodiment 1

[0053] A. Hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 4.5wt%, Si 0.30wt%, Mn 0.25wt%, P0.090wt%, S 0.012wt%, the rest is Fe and unavoidable impurities) transport To the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2200-2400mm, according to 15.0kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C 4.5wt%, Si 0.30wt%, Mn 0.25wt%, P0.090wt%, S 0.002wt%, the rest is Fe and unavoidable impurities.

[0054] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C 4.5wt%, Si 0.30wt%, Mn0.25wt%, P 0.090wt%, S 0....

Embodiment 2

[0067] A, hot metal pretreatment desulfurization: blast furnace hot metal (chemical composition C 4.8wt%, Si 0.40wt%, Mn 0.38wt%, P0.102wt%, S 0.017wt%, the rest is Fe and unavoidable impurities) transport To the KR method molten iron pretreatment device for desulfurization treatment, the insertion depth of the stirring head is controlled at 2200-2400mm, according to 16.0kg / t 钢 Add the conventional CaO-based desulfurizer for desulfurization treatment, and control the stirring time to 8 minutes; after the stirring, carry out the slag removal operation to ensure that the molten iron surface in the ladle is exposed ≥ 4 / 5, and remove the desulfurization slag; the molten iron composition after pretreatment The control is: C 4.6wt%, Si 0.40wt%, Mn 0.38wt%, P0.102wt%, S 0.003wt%, the rest is Fe and unavoidable impurities.

[0068] B, molten steel smelting: the pretreatment deep desulfurization hot metal of step A (chemical composition C 4.6wt%, Si 0.40wt%, Mn0.38wt%, P 0.102wt%, S 0....

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Abstract

The invention discloses a steel wire rod for a high-strength boron-contained and annealing-free fastening piece and a preparation method thereof. The steel wire rod for the high-strength boron-contained and annealing-free fastening piece comprises the following chemical components in percentage by weight: 0.20-0.24 wt% of C, Si not more than 0.04 wt%, 0.50-0.70 wt% of Mn, 0.25-0.35 wt% of Cr, 0.035-0.055 wt% of Ti, 0.035-0.055 wt% of Als, 0.0045-0.0060 wt% of B, S not more than 0.004 wt%, P not more than 0.012 wt%, O not more than 0.0015 wt%, H not more than 0.00015 wt%, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of molten iron pretreatment desulfurization, molten steel smelting, deoxidation alloying, molten steel LF furnace refining, molten steel VD furnace vacuum refining, molten steel pouring, steel blank heating and controlled rolling and controlled cooling. The steel wire rod for high-strength boron-contained and annealing-free fastening piece is high in cleanness, few in inclusions, excellent in hardenability, proper in strength and hardness and excellent in ductility and toughness and cold heading and upsetting deformation capacity, can directly form a 10.9-grade high-level standard part through cold heading without needing spheroidizing annealing, reduces the processing procedures and the steel consumption, and reduces the production cost.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a boron-containing high-strength annealing-free fastener steel wire rod and a preparation method thereof. Background technique [0002] Steel for fasteners is steel for standard parts with high interchangeability produced by cold heading extrusion molding process. Steel for fasteners is formed by metal plastic processing at room temperature. The internal structure of the material is tight, the mechanical properties of the product are good, the loss of processed materials is small, the production efficiency is high, the energy consumption is low, the product has high dimensional accuracy, and the surface finish is good. It is widely used in Production of cold heading bolts, nuts, screws, rivets and pins and other fasteners and spare parts. [0003] In recent years, with the adjustment of the product structure of the fastener industry, the development of fasteners fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/18C22C38/14C22C38/06C22C33/04
CPCC22C33/04C22C38/002C22C38/04C22C38/06C22C38/14C22C38/18
Inventor 陈伟赵宇张卫强陆大章王卫东李金柱岳伟杨春雷文玉兵张瑜苏灿东朱锡森张志波马松
Owner WUKUN STEEL
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