Hot rolling wire rod for mechanical structure of 1600 Mpa level and manufacture method thereof

A technology of mechanical structure and manufacturing method, which is applied in the field of iron and steel materials and hot-rolled steel, can solve the problems of difficult realization of large-scale production, complex production process, and many alloy elements, and achieve reasonable composition and process design, simplified process flow, The effect of using less

Active Publication Date: 2011-07-13
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adds more alloying elements, and the cost is higher; rapid cooling and low-temperature tempering treatment, the plasticity of the steel is poor; in addition, quenching and tempering treatment make the production process complicated, and it is not easy to realize large-scale production

Method used

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  • Hot rolling wire rod for mechanical structure of 1600 Mpa level and manufacture method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The molten steel is smelted in a vacuum electromagnetic induction furnace according to the chemical composition shown in Table 1, and cast into continuous casting slabs or steel ingots. Heat the continuous casting slab or steel ingot to 1200°C, keep it warm for 115 minutes, and carry out rough rolling. The rough rolling start temperature is 1150°C, and roll into a bar with a diameter of φ22±0.5mm. Then carry out finish rolling, the finish rolling temperature is 980 ℃, roll into the wire rod of φ9±0.3mm on the continuous rolling mill, air cooling after rolling.

Embodiment 2

[0028] Embodiment is the same as embodiment 1. The heating temperature is 1220°C, and the temperature is kept for 120 minutes; the rough rolling temperature is 1165°C; the finish rolling temperature is 1000°C, and the rolling is air-cooled.

Embodiment 3

[0030] Embodiment is the same as embodiment 1. The heating temperature is 1250°C, and the heat preservation time is 125 minutes; the rough rolling temperature is 1170°C; the finishing rolling temperature is 1010°C, and the rolling is air-cooled.

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Abstract

The invention provides a hot rolling wire rod for a mechanical structure of 1600 Mpa level and a manufacture method thereof. The hot rolling wire rod for the mechanical structure comprises the following chemical components by weight percent: 0.20 to 0.30 wt percent of C, 1.5 to 3.0 wt percent of Si, 2.0 to 4.0 wt percent of Mn, 0.20 to 0.30 wt percent of Mo, and the balance of Fe and unavoidable impurities. The invention adopts Mn-Si-Mo line components, and obtains the hot rolling wire rod taking an acicular martensite as a main tissue and containing a bainite of 5 percent to 10 percent as thecharacteristics at the same time through production procedures such as smelting, rough rolling, finish rolling and the like. The hot rolling wire rod has higher strength, excellent toughness and ductility, the yield strength no less than 1300 Mpa, the tensile strength no less than1600 Mpa, the yield ratio no less than 0.70 percent, the elongation no less than 10.0 percent and the reduction of area no less than 50 percent.

Description

technical field [0001] The present invention relates to iron and steel materials, specifically, the present invention relates to hot-rolled steel products, and more specifically, the present invention relates to a 1600MPa grade mechanical structural hot-rolled wire rod and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of industries such as bridges, automobiles and machinery manufacturing, as well as the sustainable development of resource conservation and environmental friendliness, the demand for high-strength wire and bar steel is increasing. The main techniques for increasing the strength of wire and bar steel are alloying and increasing the carbon content. Alloying technology is currently a commonly used method to improve the strength of steel. The strength and toughness of steel are improved through the alloying and strengthening of alloying elements Ni, Cr, Mo, Si and Mn and microalloying elements Nb, V, Ti, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12B21B37/74
Inventor 高加强刘俊亮王军艺
Owner BAOSHAN IRON & STEEL CO LTD
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