HRB400E ordinary-speed hot-rolled ribbed steel bar with tensile strength of 700 Mpa or above

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: 2022-07-08
GUANGXI LIUGANG HUACHUANG TECH R & D CO LTD +1
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Problems solved by technology

[0005] 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

Method used

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  • HRB400E ordinary-speed hot-rolled ribbed steel bar with tensile strength of 700 Mpa or above
  • HRB400E ordinary-speed hot-rolled ribbed steel bar with tensile strength of 700 Mpa or above
  • HRB400E ordinary-speed hot-rolled ribbed steel bar with tensile strength of 700 Mpa or above

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Embodiment Construction

[0021] In order to have a clearer understanding of the technical features, objects and effects of the present invention, the present invention will now be described.

[0022] This application is suitable for ordinary bars, and the finish rolling speed is relatively slow. According to different specifications, the finish rolling speed (the exit speed of the finishing mill in hot tandem rolling) is only 1 / 3 to 1 / 2 of that of high-speed bars. At the same time, due to different production lines, more alloys need to be added to achieve the same performance, and more specifications are produced than high-speed bars.

[0023] (1) Composition design: increase the content of Si and Mn in the steel and add V element to combine with N in the steel to increase the strength, control the N element in the steel within a reasonable range, so that most of the N is combined with V to reduce the free N in the steel . When B element is added, since most of N in steel combines with V to produce c...

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Abstract

The invention provides an HRB400E ordinary speed hot rolling ribbed steel bar with the tensile strength of 700 Mpa or above. The HRB400E ordinary speed hot rolling ribbed steel bar comprises the following components in percentage by weight: 0.19%-0.25% of C, 0.60%-0.80% of Si, 1.45%-1.60% of Mn, less than or equal to 0.040% of P, less than or equal to 0.035% of S, 0.065%-0.10% of V, 0.010%-0.022% of Nb, 0.008%-0.020% of N and 0.0020%-0.0050% of B. By means of the method, the tensile strength of the HRB400E straight hot-rolled ribbed steel bar with the specification of phi 10-40 mm can be improved to 700 Mpa or above, the yield ratio R degree m / R degree eL is larger than or equal to 1.45, and a hot-rolled ribbed steel bar product with the anti-seismic property better than that of the conventional HRB400E is obtained.

Description

[0001] The present invention is: application date: June 10, 2021, application number: 2021106484836, name of invention: HRB400E general-speed hot-rolled ribbed steel bar with tensile strength above 700Mpa and its production method, a divisional application. technical field [0002] The invention belongs to the field of steel production and manufacture, and relates to a common HRB400E hot-rolled ribbed steel bar with a tensile strength of over 700 Mpa or a normal-speed HRB400E hot-rolled ribbed steel bar with a tensile strength of over 700 Mpa. Background technique [0003] HRB400E seismic steel bars are widely used due to their high strength and good seismic performance. GB / T 1499.2-2018 "Steel for Reinforced Concrete Part 2: Hot-Rolled Ribbed Steel Bars" has plastic indexes for HRB400E seismic steel bars (such as: maximum total force Elongation A gt , strong bending ratio R° m / R° eL , R° eL / R eL and other indicators) have clear requirements. The tensile strength of t...

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Application Information

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Patent Type & Authority Applications(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 钱学海李宗强陈学良李西德文震何维肖娟蒙曰睿赵贤平廖耀俊温小园
Owner GUANGXI LIUGANG HUACHUANG TECH R & D CO LTD
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