Method for producing thin-specification SAPH440 steel based on ESP thin slab continuous casting and rolling process

A thin-slab continuous casting and thin-gauge technology, which is applied in metal rolling, metal rolling, rolling mill control devices, etc., to achieve the effects of short production process, cost reduction and energy saving

Active Publication Date: 2017-06-13
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a method for producing thin-gauge SAPH440 steel based on the ESP thin slab continuous casting and rolling process, to solve the problems of subsequent cold rolling and annealing in the traditional production technology, and to meet the requirements of product strength, elongation, etc. rate and other performance requirements

Method used

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  • Method for producing thin-specification SAPH440 steel based on ESP thin slab continuous casting and rolling process
  • Method for producing thin-specification SAPH440 steel based on ESP thin slab continuous casting and rolling process
  • Method for producing thin-specification SAPH440 steel based on ESP thin slab continuous casting and rolling process

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Experimental program
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Effect test

Embodiment 1

[0045] Select raw materials, wherein the raw materials include: 0.050% C, 0.25% Si, 1.25% Mn, 0.012% P, 0.0020% S, 0.028% Alt, and the rest are iron elements by mass percentage;

[0046] The raw materials are sequentially smelted in converter and LF furnace;

[0047] The molten steel refined by LF goes through ESP production line continuous casting, rough rolling, induction heating, finishing rolling, laminar cooling, coiling, pickling, and skin-passing processes to produce hot-rolled steel strips of different thicknesses.

[0048] Among them, in the ESP production line, the continuous casting process controls the superheat of the tundish to 18°C, the casting speed is 5.3m / min, and the thickness of the slab is 95mm;

[0049] The cast slab is rolled through three passes of rough rolling, the rough rolling inlet temperature is 1020°C, and the rough rolling exit temperature is 980°C;

[0050] The rough-rolled intermediate billet product is heated by an induction furnace, and the...

Embodiment 2

[0058] Select raw materials, wherein the raw materials include: 0.051% C, 0.25% Si, 1.28% Mn, 0.012% P, 0.0025% S, 0.030% Alt, and the rest are iron elements by mass percentage;

[0059] The raw materials are sequentially smelted in converter and LF furnace;

[0060] The molten steel refined by LF goes through ESP production line continuous casting, rough rolling, induction heating, finishing rolling, laminar cooling, coiling, pickling, and skin-passing processes to produce hot-rolled steel strips of different thicknesses.

[0061] Among them, in the ESP production line, the continuous casting process controls the superheat of the tundish to 20°C, the casting speed is 5.3m / min, and the thickness of the slab is 95mm;

[0062] The slab is rolled through three passes of rough rolling, the rough rolling inlet temperature is 1010°C, and the rough rolling exit temperature is 980°C;

[0063] The rough-rolled intermediate billet product is heated by an induction furnace, and the outl...

Embodiment 3

[0071] Select raw materials, wherein the raw materials include: 0.049% C, 0.26% Si, 1.33% Mn, 0.012% P, 0.0020% S, 0.030% Alt, and the rest are iron elements by mass percentage;

[0072] The raw materials are sequentially smelted in converter and LF furnace;

[0073] The molten steel refined by LF goes through ESP production line continuous casting, rough rolling, induction heating, finishing rolling, laminar cooling, coiling, pickling, and skin-passing processes to produce hot-rolled steel strips of different thicknesses.

[0074] Among them, in the ESP production line, the continuous casting process controls the superheat of the tundish to 21°C, the casting speed is 5.2m / min, and the thickness of the slab is 95mm;

[0075] The slab is rolled through three passes of rough rolling, the rough rolling inlet temperature is 1010°C, and the rough rolling exit temperature is 980°C;

[0076] The rough-rolled intermediate billet product is heated by an induction furnace, and the outl...

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Abstract

The invention provides a method for producing thin-specification SAPH440 steel based on an ESP thin slab continuous casting and rolling process. The method includes the steps that raw materials are selected, wherein the raw materials include, by mass percent, 0.04%-0.10% of C, 0.15%-0.45% of Si, 1.00%-1.50% of Mn, 0.008%-0.045% of Alt, smaller than or equal to 0.0030% of S, smaller than or equal to 0.015% of P and the balance iron; the raw materials are subjected to converter smelting and LF furnace smelting; molten steel formed from an LF furnace passes through an ESP production line to generate hot-rolled strip steel different in thickness, wherein in the ESP production line, the temperature of a rough rolling inlet ranges from 950 DEG C to 1050 DEG C, the temperature of a finish rolling outlet ranges from 800 DEG C to 870 DEG C; and the hot-rolled strip steel is cooled to the temperature ranging from 530 DEG C to 680 DEG C and then enters a coiling machine to be coiled, then scale breading acid pickling is conducted, and the hot-rolled strip steel is flattened through a 1%-3% flattening machine and is coiled to be put into a warehouse. By means of the method, the problem that subsequent cold rolling and annealing are needed in the traditional production technology is solved.

Description

technical field [0001] The invention relates to the technical field of metal material processing and forming, and more specifically relates to a method for producing hot-rolled thin gauge SAPH440 structural steel based on the ESP full-endless thin slab continuous casting and rolling process. Background technique [0002] In recent years, with the continuous decline of the steel market, steel has been in a state of meager or no profit, forcing steel manufacturers to explore ways to reduce costs. At present, the domestic emphasis on environmental protection has been further strengthened, and environmental protection requirements are unprecedentedly strict. Therefore, Exploring cost-reducing and environmentally friendly steel production processes has become a very necessary way of survival. [0003] Making full use of ESP to develop and apply new products is in line with the national overall planning and industry planning, in line with the relevant policies and regulations of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06B21B1/46B21B37/74B21B37/76B21B37/16B21B1/26
CPCB21B1/26B21B1/463B21B37/16B21B37/74B21B37/76C22C38/02C22C38/04C22C38/06
Inventor 朱经涛秦哲谢国海刘宏志王福良狄丽华严进宝吴进罗继锋于长江喻尧谢基表王学伦刘守杰徐由标孙庆强季伟斌
Owner RIZHAO STEEL HLDG GROUP
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