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High-strength steel plate and manufacturing method thereof

A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, chemical instruments and methods, metal material coating technology, etc., can solve the problems of reduced formability, difficulty in combining high strength, etc., and achieve excellent fatigue characteristics and use value Large, stretchable effect

Active Publication Date: 2019-01-08
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in general, increasing the strength of a steel sheet leads to a decrease in formability, so it is difficult to achieve both high strength and excellent formability, and a steel sheet having both high strength and excellent formability is desired

Method used

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  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof

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Embodiment

[0191] A steel having the composition shown in Table 1 and the remainder consisting of Fe and unavoidable impurities was melted in a converter and cast into a billet by a continuous casting method. After heating and hot-rolling the obtained steel slabs under the conditions shown in Table 2, pickling treatment was carried out. , 22, 24, 27, 29, 31, 33, 35, 36, 38, 40, 41, 45, 48, 49, 51, 54, and 58 were implemented under the conditions shown in Table 2 without cold rolling Annealing treatment to obtain high-strength hot-rolled steel sheet (HR). In addition, in No. 2, 7, 10, 11, 13, 15, 18, 20, 21, 23, 25, 26, 28, 30, 32, 34, 37, 39, 42 to 44 shown in Table 2, In 46, 47, 50, 52, 53, 55 to 57, and 59, high-strength cold-rolled steel sheets (CR) were obtained by annealing under the conditions shown in Table 2 after cold rolling. Furthermore, some steel sheets are subjected to galvanizing treatment to obtain galvanized steel sheets (GI), alloyed galvanized steel sheets (GA), and ...

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Abstract

A method for manufacturing a high-strength steel plate, comprising the following steps: a hot rolling step, heating a steel slab having a predetermined composition to 1100°C to 1300°C, and performing hot rolling at a finish rolling outlet temperature of 800°C to 1000°C, Coiling at an average coiling temperature of 200°C to 500°C to make a hot-rolled steel sheet; pickling treatment process, pickling the above-mentioned hot-rolled steel sheet; and annealing process, heating the above-mentioned hot-rolled steel sheet After the temperature of ℃ is maintained for 10 seconds to 900 seconds, it is cooled to a cooling stop temperature greater than 350°C and below 550°C at an average cooling rate of 5°C / second to 50°C / second. The temperature zone is maintained for more than 10 seconds.

Description

technical field [0001] The present invention relates to a high-strength steel sheet excellent in formability mainly suitable for automotive structural parts and a method for producing the same. In particular, it relates to obtaining a tensile strength (TS) of 780 MPa or more at high productivity, excellent ductility and excellent fatigue properties. Excellent high strength steel plate. Background technique [0002] In recent years, the use of high-strength steel sheets with a tensile strength (TS) of 780 MPa or more and a thin plate thickness in automotive structural parts has been actively carried out for the purpose of ensuring the safety of the crew during collisions and improving fuel consumption by reducing the weight of the car body. application. [0003] In particular, the application of high-strength steel sheets having extremely high strength, which has TS of 980 MPa class and 1180 MPa class, has recently been studied. [0004] However, in general, increasing the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/46C21D8/02C22C38/04C22C38/60
CPCC22C38/04C22C38/60C21D8/0226C21D8/0236C21D8/0263C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/06C22C38/12C22C38/16C22C38/18C21D8/0247C21D1/26C21D9/46B32B15/013C21D8/0278C21D2211/001C21D2211/002C21D2211/005C22C38/14C22C38/38C23C2/28C23C2/06C23C2/40C23G1/00
Inventor 川崎由康松田广志横田毅船川义正濑户一洋松原行宏
Owner JFE STEEL CORP
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