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HRB400E general-speed hot-rolled ribbed steel bar with tensile strength above 700mpa and production method thereof

A hot-rolled ribbed steel bar, tensile strength technology, applied in the direction of metal rolling, temperature control, etc., can solve the problems of low tensile strength, low strength-to-yield ratio, etc., and achieve the effect of excellent seismic performance

Active Publication Date: 2022-04-12
广西柳钢华创科技研发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a HRB400E ordinary-speed hot-rolled ribbed steel bar with a tensile strength above 700Mpa to solve the problems of the existing ordinary-speed (non-high-bar) HRB400E seismic steel bar with low tensile strength and low yield ratio

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  • HRB400E general-speed hot-rolled ribbed steel bar with tensile strength above 700mpa and production method thereof
  • HRB400E general-speed hot-rolled ribbed steel bar with tensile strength above 700mpa and production method thereof

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Embodiment Construction

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention is now described.

[0021] This application is applicable to ordinary bars, and the finish rolling speed is relatively slow. According to different specifications, the finish rolling speed (the exit speed of the finishing rolling unit of hot continuous rolling) is only 1 / 3 to 1 / 2 of high-speed bars. At the same time, due to the different production lines, more alloys need to be added to achieve the same performance, and more specifications are produced than high-speed bars.

[0022] (1) Composition design: increase the content of Si and Mn in the steel and add V elements to combine with N in the steel to increase the strength, control the N elements in the steel in a reasonable range, so that most of the N is combined with V to reduce the free N in the steel . Add B element, because most of the N in the steel is combined with V to pro...

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Abstract

The invention provides a HRB400E general-speed hot-rolled ribbed steel bar with a tensile strength of more than 700Mpa and a production method thereof. The production method of the HRB400E general-speed hot-rolled ribbed steel bar with a tensile strength of more than 700Mpa comprises: the following steps are carried out in sequence Process stage: blast furnace hot metal smelting, hot metal desulfurization pretreatment, converter molten steel smelting, LF refining, billet continuous casting, hot continuous rolling, cut-to-length cutting; the composition of the HRB400E normal-speed hot-rolled ribbed steel bar is as follows: C: 0.19-0.25%, Si: 0.60-0.80%, Mn: 1.45-1.60%, P≤0.040%, S≤0.035%, V: 0.065-0.10%, Nb: 0.010-0.022%, N: 0.008-0.020 %, B: 0.0020 to 0.0050%. By using the present invention, the tensile strength of HRB400E straight hot-rolled ribbed steel bar with a specification of Φ10-40mm can be increased to more than 700Mpa, and the strength-to-yield ratio R° m / R° eL Greater than or equal to 1.45, hot-rolled ribbed steel products with better seismic performance than conventional HRB400E can be obtained.

Description

technical field [0001] The invention belongs to the field of iron and steel production and manufacturing, and relates to a common HRB400E hot-rolled ribbed steel bar with a tensile strength of more than 700Mpa and a production method thereof, or a normal-speed HRB400E hot-rolled ribbed steel bar with a tensile strength of more than 700Mpa and a production method thereof . Background technique [0002] HRB400E seismic steel bars are widely used due to their high strength and good seismic performance. In GB / T 1499.2-2018 "Steel for Reinforced Concrete Part 2: Hot-rolled Ribbed Steel Bars", the plasticity index of HRB400E seismic steel bars (such as: maximum force total Elongation A gt , Strength ratio R° m / R° eL , R° eL / R eL and other indicators) have clear requirements. The tensile strength of conventional HRB400E seismic steel bars is about 600MPa. Under the premise of meeting the plasticity index in the national standard, the higher the tensile strength, it means th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/04C21D8/08B21B1/16B21B37/74
CPCC22C38/02C22C38/04C22C38/12C22C38/001C22C38/002C22C33/04C21D8/065C21D8/08B21B37/74C21D2211/002B21B1/163
Inventor 钱学海文震李宗强陈学良李西德何维肖娟蒙曰睿赵贤平廖耀俊温小园
Owner 广西柳钢华创科技研发有限公司