Drahtstahl for high strength fastening piece and production method thereof

A fastener and high-strength technology, applied in the direction of metal rolling, can solve problems such as prolonging the transformation time, and achieve the effect of improving cold deformation ability, excellent drawability and steel quality.

Inactive Publication Date: 2010-07-28
武钢集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloying elements added during the rolling process will inhibit the structural transformation of the steel and prolong the transformation time

Method used

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  • Drahtstahl for high strength fastening piece and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A wire steel for high-strength fasteners, its composition and weight percentage are: C: 0.39, Si: 0.15, Mn: 0.60, Cr: 0.60, Als: 0.010, P≤0.035, S≤0.035, and the rest is Fe and unavoidable impurities.

[0037] Its production steps:

[0038] 1) The components and weight percentages are: C: 0.39, Si: 0.15, Mn: 0.60, Cr: 0.60, Als: 0.010, P≤0.035, S≤0.035, and the rest are Fe and unavoidable impurities. Converter clean steel process for smelting and continuous casting into billets, adding 320 meters of Si-Ca wire for each furnace of steel during refining, controlling the input speed of Si-Ca wire to 28 m / s, and the alkalinity of steel slag in the ladle to 2.45 ;

[0039] 2) Heating the 200×200mm continuous casting slab to 980°C;

[0040] 3) Rough rolling: the continuous casting slab is rough rolled through 6 stands at 980°C, and the deformation is 70%;

[0041] 4) Intermediate rolling with 10 stands: control its deformation at 80%;

[0042] 5) Carry out pre-finish rol...

Embodiment 2

[0050] A wire steel for high-strength fasteners, its composition and weight percentage are: C: 0.434, Si: 0.256, Mn: 0.704, P: 0.015, S: 0.008, Cr: 1.008, Als: 0.0187, P≤0.035 , S≤0.035, and the rest are Fe and unavoidable impurities.

[0051] Its production steps:

[0052] 1) The components and weight percentages are: C: 0.434, Si: 0.256, Mn: 0.704, P: 0.015, S: 0.008, Cr: 1.008, Als: 0.0187, P≤0.035, S≤0.035, and the rest are Fe and The steel composition of unavoidable impurities is smelted by converter clean steel process and continuously cast into slabs. During refining, 355 meters of Si-Ca wire is added to each furnace of steel, and the input speed of Si-Ca wire is controlled to 29 m / s. The basicity of the steel slag in the ladle is 2.40;

[0053] 2) Heating the 200×200mm continuous casting slab to 995°C;

[0054] 3) Rough rolling: the continuous casting slab is rough rolled through 6 stands at 995°C, and the deformation is 73%;

[0055] 4) Intermediate rolling with 10 ...

Embodiment 3

[0064] A wire steel for high-strength fasteners, its composition and weight percentage are: C: 0.407, Si: 0.219, Mn: 0.718, P: 0.015, S: 0.009, Cr: 0.971, Als: 0.0242, P≤0.035 , S≤0.035, and the rest are Fe and unavoidable impurities.

[0065] Its production steps:

[0066] 1) The components and weight percentages are: C: 0.407, Si: 0.219, Mn: 0.718, P: 0.015, S: 0.009, Cr: 0.971, Als: 0.0242, P≤0.035, S≤0.035, and the rest are Fe and The steel composition of unavoidable impurities is smelted by converter clean steel process and continuously cast into slabs. During refining, 400 meters of Si-Ca wire is added to each furnace of steel, and the input speed of Si-Ca wire is controlled to be 30 m / s. The basicity of the steel slag in the ladle is 2.35;

[0067] 2) Heating the 200×200mm continuous casting slab to 1010°C;

[0068] 3) Rough rolling: the continuous casting slab is rough rolled through 6 stands at 1010°C, and the deformation is 75%;

[0069] 4) Intermediate rolling w...

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Abstract

The invention relates to a drahtstahl for a fastening piece and a production method thereof, and the drahtstahl comprises the following components by weight percent: 0.39-0.48 % of C, 0.15-0.35% of Si, 0.30-0.90% of Mn, 0.60-1.20% of Cr, 0.010-0.07% of Als, less than or equal to 0.035% of P, less than or equal to 0.035% of S and the balance Fe and unavoidable impurity; and the production method comprises the following steps: smelting with a clean steel process and casting into a blank, and adding Si-Ca line in the refining; heating the continuous casting to 980-1,080 DEG C; rough rolling: controlling the deflection to be 70-80%; intermediate rolling: controlling the deflection to be 80-90%; pre-precision rolling: controlling the deflection to be 65-75%; water-cooling until the temperature is cooled to be 1,000-1,020 DEG C; precision rolling: controlling the deflection to be 60-90%; water-cooling for the second time until the temperature is cooled to be 800-900 DEG C; spinning; cooling to phase change initial temperature, namely the range from Ar3 to 50 DEG C higher than Ar3 by adopting an aerial fog mixed method; and continually cooling until the temperature is cooled to be 400-500 DEG C and naturally cooling to environment temperature. The invention can be drawn directly, has good cold deformation and is not easy to crack.

Description

technical field [0001] The invention relates to wire steel for fasteners and a production method thereof, in particular to wire steel for making grade 8.8-10.9 fasteners and a production method thereof. Background technique [0002] In recent years, with the rapid development of my country's machinery manufacturing and automobile industries, the demand for high-strength fasteners has grown rapidly. According to reports, in 2008, the output of medium and high-grade alloy cold heading steel for automotive fasteners alone exceeded 1.2 million tons. The market demand is strong. This work is used to produce 8.8-10.9 grade fastener products, and the manufactured fasteners can bear the tensile strength of 1000MPa grade. [0003] With the development of converter smelting technology, it has become a trend to produce alloy steel wire rods by converter continuous casting process, which has significantly improved the quality of steel. In order to satisfy high-strength fasteners with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21C7/04B21B1/16
Inventor 罗德信蒋跃东桂江兵周勇
Owner 武钢集团有限公司
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