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High-strength finish rolled steel bar and production method thereof

A production method and high-strength technology, applied in the field of steel materials, can solve the problems of high alloy composition and high cost of steel bars, and achieve the effects of reducing alloy cost, improving strength and simple control.

Inactive Publication Date: 2015-09-30
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The application provides a high-strength finish-rolled steel bar and its production method, which solves the technical problem in the prior art that the cost of the steel bar is relatively high due to the high alloy composition of the above-mentioned steel bar

Method used

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  • High-strength finish rolled steel bar and production method thereof
  • High-strength finish rolled steel bar and production method thereof
  • High-strength finish rolled steel bar and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] According to the requirements of steel composition, the chemical composition of molten steel is: C 0.427%, Si 0.465%, Mn 1.27%, P0.021%, S0.024%, Cr0.012%, B0.0011%; the steel is heated in the furnace to 1050°C, heat preservation for 120min to fully austenitize the steel. After being out of the furnace, the rolling temperature is 950°C, and the rolling pass is 2 passes, rough rolling and finishing rolling are 16 passes in total, and the total reduction ratio is 156. After finishing rolling, it is cooled to 670°C at a cooling rate of 5°C / s. Air-cool to room temperature after cooling.

Embodiment 2

[0063] According to the requirements of steel composition, the chemical composition of molten steel is: C 0.42%, Si 0.573%, Mn 1.4%, P0.023%, S0.017%, Cr 0.017%, B0.0015%; the steel is heated to 1050°C in the furnace , Keep warm for 120min to fully austenitize the steel. After being released from the furnace, the starting rolling temperature is 950°C, and the rolling pass is 2 passes, rough rolling and finishing rolling are 16 passes in total, and the total reduction ratio is 110. After finishing rolling, it is cooled to within 650°C at a cooling rate of 5°C / s. Put it on a cooling bed, and air-cool to room temperature after putting it on the cooling bed.

Embodiment 3

[0065] According to the requirements of steel composition, the chemical composition of molten steel is: C 0.448%, Si 0.391%, Mn 1.26%, P0.013%, S0.017%, Cr 0.011%, B0.0013%; the steel is heated to 1100°C in the furnace , Keep warm for 120min to fully austenitize the steel. After being released from the furnace, the starting rolling temperature is 1000°C, the rolling pass is 2 passes, the rough rolling is 14 passes, the total reduction ratio is 65, and the finishing rolling is cooled to 630°C at a rapid cooling rate of 7°C / s Put it on a cooling bed, and then air-cool to room temperature after putting it on the cooling bed.

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Abstract

The invention discloses a high-strength finish rolled steel bar and a production method thereof. The steel bar comprises, by mass, 0.42-0.46% of C, 0.3-0.60% of Si, 1.2-1.4% of Mn, 0.035% or less of P, 0.035% or less of S, 0.010-0.020% of Cr, 0.0010-0.0020% of B, and the balance of Fe and impurity elements. Compared with present technologies depending on control of the depth of a hardening layer, the production method disclosed in the invention has the advantages of improvement of the strength of the steel bar by using macrostructure phase transformation on the premise of great reduction of alloy, simple control, and realization of batch production through using a present production device without reconstruction.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a high-strength finish-rolled steel bar and a production method thereof. Background technique [0002] Finished threaded steel bars are also called prestressed concrete threaded steel bars. Our country began to develop and produce them in the 1980s. In 2005, the National Standardization Management Committee approved and issued the GB / T 20065-2006 "Prestressed Concrete Threaded Steel Bars" standard. Finish-rolled rebar is a high-strength, high-precision straight steel bar with external threads rolled on the entire steel bar. Any cross-section of the whole steel bar can be screwed with a connector with internal thread for connection, or screwed with a threaded cap for anchoring. It has the advantages of simple connection and anchoring, strong adhesion, and convenient construction, and because it saves the welding process. , to avoid fractures caused by internal stress and ...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C33/04
Inventor 徐志东徐志李媛吴杰范植金张帆王瑞敏周新龙
Owner WUHAN IRON & STEEL (GROUP) CORP
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