Unlock instant, AI-driven research and patent intelligence for your innovation.

800MPa-grade high-strength steel based on strip cast-rolling, and production method thereof

A thin-strip casting-rolling and production method technology, applied in the field of steel production, can solve the problems of long process, solidification cracks, and many processes of thin-gauge high-strength steel, and achieve the effects of less production processes, good formability, and avoiding cracking

Active Publication Date: 2020-04-10
SHAGANG GROUP +2
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention provides a production method of 800MPa grade high-strength steel based on thin-strip casting and rolling, to solve the problem of long production process of thin-gauge high-strength steel by conventional processes, many procedures, high energy consumption, and the addition of more Ti is easy to cause Solidification cracking problems and improved weldability

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 800MPa-grade high-strength steel based on strip cast-rolling, and production method thereof
  • 800MPa-grade high-strength steel based on strip cast-rolling, and production method thereof
  • 800MPa-grade high-strength steel based on strip cast-rolling, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Smelting: EAF electric furnace steelmaking, VD vacuum decarburization and deoxidation, and LF refining are used to obtain molten steel with qualified components. Percentage by weight: C: 0.032, Mn: 1.77, Si: 0.43, Cr: 0.32, Nb: 0.058, V: 0.041, P: 0.012, S: 0.002, Al: 0.002, and the balance is Fe and impurity elements.

[0039] 2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. The temperature of the tundish for molten steel pouring is 1640°C, the casting and rolling speed is 79m / min, and the molten steel is carried out under the protection of inert gas. Thin strip casting. A cast strip with a thickness of 1.68 mm was obtained.

[0040] 3) Hot rolling: the cast strip is then rolled into a thin strip of 1.22mm through one pass of hot rolling with a reduction of 27%, and the rolling exit temperature is 870°C.

[0041] 4) Cooling and coiling: the hot-rolled thin strip ...

Embodiment 2

[0045]1) Smelting: EAF electric furnace steelmaking, VD vacuum decarburization and deoxidation, and LF refining are used to obtain molten steel with qualified components. Percentage by weight: C: 0.028, Mn: 1.85, Si: 0.45, Cr: 0.28, Nb: 0.055, V: 0.039, P: 0.014, S: 0.003, Al: 0.002, and the balance is Fe and impurity elements.

[0046] 2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. The temperature of the tundish for molten steel pouring is 1632°C, the continuous casting speed is 66m / min, and the molten steel is carried out under the protection of inert gas. Thin strip casting. A cast strip with a thickness of 1.9 mm was obtained.

[0047] 3) Hot rolling: the cast strip is then rolled into a thin strip of 1.35mm through one pass of hot rolling with a reduction of 29%, and the rolling exit temperature is 865°C.

[0048] 4) Cooling and coiling: the hot-rolled thin strip is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides 800MPa-grade high-strength steel based on strip cast-rolling, and a production method thereof. Molten steel comprises the following components: 0.02%-0.05% of C, 1.2%-2.0% of Mn, 0.3%-0.7% of Si, 0.2%-0.5% of Cr, 0.03%-0.08% of Nb, 0.02%-0.07% of V, not greater than 0.003% of Al, not greater than 0.02% of P, not greater than 0.005% of S, and the balance Fe and impurity elements. A cast strip is obtained through strip continuous casting for the molten steel with the qualified components, the cast strip is subjected to hot-rolling with first-pass rolling reduction of 20%-50%, and then cooled via a mist cooling system and coiled to obtain strip steel. An outlet temperature of a hot-rolling machine is 830-1000 DEG C, an outlet temperature of a mist cooling section is 400-550 DEG C, and a coiling temperature is 300-480 DEG C. The 800MPa-grade high-strength steel based on strip cast-rolling, and the production method thereof solve the problems of long flow, high energyconsumption and difficulty to produce a high-strength small-specification product of traditional hot-rolling; meanwhile, due to a component design without Ti, the problems of cracks occurring in a continuous casting process and reduction of the low-temperature toughness of the material due to separation for large-size TiN particles in a condensation process are also avoided; and in addition, dueto a low-carbon component design, the problems that traditional high-strength steel is high in carbon content and not beneficial to welding are also solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, in particular to 800MPa-grade high-strength steel based on thin strip casting and rolling and a production method thereof. Background technique [0002] With the development of construction machinery, agricultural machinery and other fields towards lightweight, high-quality, and energy-saving, the demand for thin-gauge, high-strength / ultra-high-strength steel used for structural parts, safety parts, etc. is increasing. Such as concrete pump truck boom, truck crane telescopic boom, crawler crane pull plate, large agricultural machinery cab and silo, etc., its key components have been required to be made of ultra-high-strength thin steel plates to reduce dead weight, improve equipment efficiency and Reduce energy consumption. In the automotive field, ultra-high-strength thin steel plates have been used in body frame structural parts and safety parts. The application of ultra-hig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C38/04C22C38/02C22C38/38C22C38/26C22C38/24C22C38/06C21D8/02B22D11/06
CPCB22D11/0622C21D8/0226C21D2211/002C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/38
Inventor 冯庆晓李化龙刘俭施一新刘志桥马毅史华跃霍昌军吴荣洲朱以海
Owner SHAGANG GROUP