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500MPa anti-seismic coiled thread steel and processing method thereof

A processing method and technology of anti-seismic discs, which are applied in the field of hot rolling of steel wire rods for construction, can solve problems such as production and use risks of high-strength anti-seismic discs and snails

Inactive Publication Date: 2016-04-13
MAANSHAN IRON AND STEEL COMPANY
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Problems solved by technology

Due to the strong cooling capacity of the air-cooled line of the high-speed wire rolling mill and the wide control range, when the rolling process and cooling control after rolling are not properly controlled, bainite or Widmanstatten structures are likely to be formed on the coils, which gives high-strength shock-resistant coils Production and use of snails pose risks

Method used

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  • 500MPa anti-seismic coiled thread steel and processing method thereof

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Embodiment Construction

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0020] The technical scheme is: (1) the chemical composition (% by weight) of the steel bar is: C0.19-0.25%, Si0.45-0.70%, Mn1.2-1.50%, S≤0.04%, P≤0.04%, V0.08-0.12%. Among them, the amount of V added is added according to the lower limit for specifications of Φ8mm, and the upper limit is added for specifications above Φ10mm. (2) Process route: hot metal pretreatment→converter smelting→electromagnetic stirring (weak stirring)→140mm×140mm billet continuous casting→high-speed wire rod controlled rolling and controlled cooling process. Among them, the final rolling speed is 88.54 m / s for the specification of Φ8mm, and 56.67 m / s for the specification of Φ10mm. (3) The high-line heating, controlled rolling and controlled cooling process is as follows: the billet heating time is 65-...

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Abstract

The invention discloses 500MPa anti-seismic coiled thread steel and a processing method thereof. The 500MPa anti-seismic coiled thread steel comprises, by weight, 0.19-0.25% of C, 0.45-0.70% of Si, 1.2-1.50% of Mn, less than or equal to 0.04% of S, less than or equal to 0.04% of P, and 0.08-0.12% of V. Compared with the general production controlled cooling technology, the number of started fans is reduced greatly, and some heat preservation cover caps are closed. The cooling quality of HRB500E high-strength anti-seismic coiled thread steel is optimized, and the performance index of the total elongation at maximum force of a product is increased.

Description

technical field [0001] The invention belongs to the field of hot rolling of steel wire rods for construction, and in particular relates to a 500MPa anti-seismic coil steel and a processing method thereof. Background technique [0002] At present, the production process of threaded steel bars is mainly straight strips. The process flow is: steel billet→heating in furnace→rolling in continuous rolling mill→cooling controlled by water penetration→multi-length cutting→cooling bed→cutting to length→storage. Due to the low utilization rate and high cost of straight threaded steel bars in construction, many companies have begun to use high-speed wire rolling mills to produce small-sized threaded steel bars, which are delivered in the form of coils, mainly small-sized φ8-14mm. With the increasing demand for HRB500E high-strength anti-seismic disc screws in high-rise buildings and important projects, the national industrial policy also requires the promotion of the application of hig...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/02C22C38/04C21D8/08C21D8/06
CPCC22C38/12C21D8/065C21D8/08C22C38/02C22C38/04
Inventor 宋强吴坚于同仁宫辉张步海汤寅波郭湛方燕孙山
Owner MAANSHAN IRON AND STEEL COMPANY
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