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Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar

A production process, controlled rolling and controlled cooling technology, applied in the field of iron and steel metallurgy, can solve the problems of high price of trace alloying elements and high production costs, reduce production costs, enhance strength and plasticity, and achieve the effect of batch industrial production

Active Publication Date: 2010-12-22
福建三宝钢铁有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing conventional method of producing HRB400 steel bars is to add trace alloy elements: vanadium, niobium, titanium, etc. to enhance strength and plasticity, but the price of trace alloy elements is relatively high, so the production cost is relatively high

Method used

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  • Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar

Examples

Experimental program
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Effect test

Embodiment Construction

[0010] The continuous casting slab of 150×150×6000mm or 165×165×6000mm is heated by a three-stage continuous pusher type heating furnace and then rolled into a hot-rolled ribbed steel bar of φ10~φ32mm. The effective area of ​​the furnace is 6.8×28.5㎡, and the fuel is hot Expansion of the furnace gas, the air volume of each burner and the opening of the flue gate valve are automatically controlled by electrical appliances, so as to realize the fully automatic control of the temperature of each section and the atmosphere in the furnace. At 1100~1300°C, the temperature of the soaking section is controlled at 1100~1250°C, the temperature of the steel billet is controlled at 1100~1200°C, and the tapping is automatically controlled by the ejector rod.

[0011] The starting rolling temperature is controlled at 1050~1150℃, and the final rolling temperature is controlled at 930~970℃. The rolling line implements full continuous rolling with 17 rolling mills, including 5 φ580 closed-end r...

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Abstract

The invention relates to a controlled rolling and controlled cooling production process of an HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar, which is characterized by comprising the following steps of: heating a 150*150*6,000 mm or 165*165*6,000 mm continuous casting by a three-section continuous pusher-type heating furnace and then rolling into the hot-rolled ribbed-steel bar with the diameter of Phi10 to Phi32 mm, wherein the start rolling temperature is controlled to be 1,050-1,150 DEG C and the final rolling temperature is controlled to be 930-970 DEG C; setting a three-section water cooler after the final rolling, wherein the temperature after water cooling is 680-760 DEG C; and adjusting cooling rates of the hot-rolled ribbed-steel bars of various specifications through cooling, reheating, cooling, reheating and cooling to obtain a needed sorbite so that the steel bar is reinforced. Under the premise of ensuring the comprehensive mechanical property of the steel bar, the invention can remarkably reduce the use level of main alloys and greatly reduce production cost.

Description

technical field [0001] The invention relates to a controlled-rolling and controlled-cooling production process of HRB400 steel bars, which is applicable to the technical field of iron and steel metallurgy. Background technique [0002] The existing conventional method of producing HRB400 steel bars is to add trace alloy elements: vanadium, niobium, titanium, etc. to enhance strength and plasticity, but the price of trace alloy elements is relatively high, so the production cost is relatively high. Contents of the invention [0003] The object of the present invention is to provide a controlled rolling and controlled cooling production process of HRB400 steel bars, which enhances the strength and plasticity of steel bars and reduces production costs by controlling the starting rolling temperature, deformation and cooling after final rolling. [0004] The present invention is characterized in that: a controlled-rolling and air-cooling production process of HRB400 steel bar, ...

Claims

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Application Information

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IPC IPC(8): B21B37/74C22C38/04
Inventor 王光文
Owner 福建三宝钢铁有限公司
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