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A 750mpa grade high-strength steel plate, its use and its manufacturing method

A high-strength steel plate and a manufacturing method technology, applied in the field of metal materials, can solve the problems of high crack sensitivity, low high-temperature plasticity of cast slabs, easy occurrence of cracks, etc., and achieve good uniformity of mechanical properties, high shape and size accuracy, and welding performance. good effect

Active Publication Date: 2017-03-08
MAGANG (GROUP) HOLDING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the content of Cu element and relatively high Ti element in this material, the billet has low high-temperature plasticity and high crack sensitivity. Cracks are prone to appear on the surface and corner of the billet, which is a difficult problem in production, and the Ti content in the steel is high. Due to the Ti element The yield rate in the smelting process is not easy to control, the Ti content in different furnace steels is not easy to control stably, and the strength of different furnace steel plates fluctuates greatly

Method used

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  • A 750mpa grade high-strength steel plate, its use and its manufacturing method
  • A 750mpa grade high-strength steel plate, its use and its manufacturing method
  • A 750mpa grade high-strength steel plate, its use and its manufacturing method

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Embodiment Construction

[0025] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0026] This embodiment provides a 750MPa grade high-strength steel plate and its manufacturing method, the mass percentage of its main chemical components is C: 0.14-0.18%; Si: 0.20-0.40%; Mn: 1.30-1.70%; P: ≤0.015%; S: ≤0.005%; Nb: 0.030-0.060%; V: 0.030-0.060%; Cr: 0.20-0.50%; Mo: 0.05-0.20%; Al: 0.015-0.040%; the balance is Fe and inevitable inclusions . Without the addition of Cu and B elements that have adverse effects on the high-temperature plasticity of the slab, and without the addition of Ti elements, the continuous casting slabs of the above smelted molten steel have good surface quality of the slabs. The molten steel smelted according to the above chemical composition is continuously cast into a slab with a thickness of 230 mm. The slab is heated in a heating furnace for 3 t...

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Abstract

The invention relates to a 750MPa-level high-strength steel plate, and application and a manufacturing method thereof. The 750MPa-level high-strength steel plate contains the following components in percentage by weight: 0.14-0.18% of C, 0.20-0.40% of Si, 1.30-1.70% of Mn, at most 0.015% of P, at most 0.005% of S, 0.030-0.060% of Nb, 0.030-0.060% of V, 0.20-0.50% of Cr, 0.05-0.20% of Mo, 0.015-0.040% of Al, and the balance of Fe and inevitable impurities. The steel plate produced according to the chemical components, technique and specific method has the following parameters: the yield strength is 650-700 MPa, the tensile strength is 800-850 MPa, the elongation percentage is 16-20%, the hardness HV10 is 250-300, the -60 DEG C Charpy V-notch impact energy is greater than 40J (the size of the impact specimen is 4*10*55mm), the transverse, longitudinal and 45-degree strength difference is less than 20 MPa, and the mechanical property uniformity is high.

Description

technical field [0001] The invention relates to metal materials, to the technical field of continuous hot-rolled metal strips, in particular to 750MPa high-strength steel plates and a manufacturing method thereof. Background technique [0002] Concrete mixer trucks are usually classified according to the mixing volume, and the general mixing volume is 3 to 12m 3 , The tank body material of the mixer truck generally adopts the steel plate of the Q345 strength level. 14m in recent years 3 The market demand for large-capacity concrete mixer trucks and above is increasing. The application of large-capacity concrete mixer trucks is conducive to improving construction efficiency. The use of high-strength steel plates to manufacture concrete mixer truck tanks can reduce the weight of concrete mixer trucks, reduce energy consumption and Improve transportation efficiency. The manufacture of mixer truck tanks requires forming and welding processes, so the steel plates for large-cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/26C21D8/02
Inventor 胡学文张建王海波
Owner MAGANG (GROUP) HOLDING CO LTD
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