Weathering-resistant steel for high-strength low-yield-strength-ratio weathering-resistant carriage and preparation method thereof

A low-yield-strength, high-strength technology, applied in the field of weathering steel for high-strength low-yield-ratio weathering carriages and its preparation, can solve the problem of not considering the need for hot rolling, building slow cooling pits, and not reserving construction delays. Cold pit site space and other issues

Inactive Publication Date: 2019-08-06
BAOTOU IRON & STEEL GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Since the product outline is positioned at the production of cold-rolled automotive steel products, hot-rolled products that require slow cooling were not considered in the hot-rolled finished product warehouse, and no slow-cooling pit was built during construction, and no space was reserved for the construction of slow-cooling pits

Method used

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  • Weathering-resistant steel for high-strength low-yield-strength-ratio weathering-resistant carriage and preparation method thereof
  • Weathering-resistant steel for high-strength low-yield-strength-ratio weathering-resistant carriage and preparation method thereof
  • Weathering-resistant steel for high-strength low-yield-strength-ratio weathering-resistant carriage and preparation method thereof

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Experimental program
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Effect test

Embodiment Construction

[0015] 1. Product production process route

[0016] Hot metal pretreatment—converter top and bottom combined blowing smelting—LF refining outside furnace—slab continuous casting—slow cooling

[0017] Slab heating—high pressure water descaling—fixed width press—E1R1 roughing mill rolling—E2R2 roughing mill rolling—flying shear—high pressure water descaling—F1~F7 finishing mill rolling—intensive laminar cooling—coiling - Pallet transportation system - Warehouse - Slow cooling under the insulation cover - Sampling and inspection after 48 hours - Weighing and packaging.

[0018] 2. Steelmaking process

[0019] 2.1 Smelting process

[0020] 2.1.1 Converter smelting: molten iron is pretreated and desulfurized for converter smelting, oxygen is blown to decarburize and the temperature is raised, ferrosilicon and ferromanganese are added for deoxidation and alloying in the later stage of smelting, P and S components are controlled, and molten steel is prevented from overoxidation. Th...

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Abstract

The invention discloses weathering-resistant steel for a high-strength low-yield-strength-ratio weathering-resistant carriage. The weathering-resistant steel comprises the following chemical components of, by mass, 0.10%-0.12% of C, 0.30%-0.50% of Si, 0.30%-0.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.050% of Al, 0.26%-0.36% of Cu, 0.50%-0.60% of Cr, 0.15%-0.25% of Ni, less than or equal to 50 ppm of N and the balance Fe and inevitable inclusions, wherein the mass fraction is 100% in total. The invention also discloses a preparationmethod of the weathering-resistant steel for the high-strength low-yield-strength-ratio weathering-resistant carriage. According to the weathering-resistant steel for the high-strength low-yield-strength-ratio weathering-resistant carriage and the preparation method thereof, the chemical components and the production process of the product are adjusted, and a heat preservation cover in a storehouse is adopted for slow cooling, so that unqualified products caused by the fact that no slow cooling facility exist in the finished product warehouse can be effectively eliminated.

Description

technical field [0001] The invention relates to a weather-resistant steel (Q345NQR2) for high-strength and low-yield-ratio weather-resistant carriages and a preparation method thereof. Background technique [0002] Since the product outline is positioned at the production of cold-rolled automotive steel products, hot-rolled products that require slow cooling were not considered in the hot-rolled finished product warehouse, and no slow-cooling pit was built during construction, and no site space for the slow-cooling pit was reserved. The market demand for railway carriage products is very large. In order to meet the needs of local customers and surrounding customers, our factory aims at the production of this hot-rolled product, from the chemical composition, hot rolling controlled rolling production process, controlled cooling production process, slow cooling process in the warehouse In-depth research has been carried out, and it is an urgent problem to be solved to develop ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/06C22C38/04C22C38/02C22C33/06C21D8/02
CPCC21D8/0205C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42
Inventor 敬鑫刘妍宿成刘朋成董磊孙婷婷陈建华刘成龙
Owner BAOTOU IRON & STEEL GRP
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