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Strength of extension 780 MPa grade complex phase steel plate and mfg. method thereof

A technology of tensile strength and steel plate, applied in the field of steel rolling, to achieve the effect of comprehensive performance of considerable strength and plasticity

Inactive Publication Date: 2006-06-28
NORTHEASTERN UNIV
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Problems solved by technology

[0004] Aiming at the problems existing in the existing high-strength automotive hot-rolled steel sheets and their production processes, the present invention provides a composite-phase steel sheet with a tensile strength of 780MPa and a manufacturing method thereof

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  • Strength of extension 780 MPa grade complex phase steel plate and mfg. method thereof

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Embodiment Construction

[0013] The steel with the chemical composition shown in Table 1 is selected as the raw material, and the blank size is 80mm (thickness) × 70mm (width) × 140mm (length). In the hot rolling mill, the steel plate with a thickness specification of 3-4.5 mm was rolled, and a two-stage rapid cooling process was adopted after rolling. The cooling process is shown in Table 2, and the mechanical properties and microstructure scores are shown in Table 3.

[0014] Ingredient number

[0015]

[0016]

[0017] where: R e - Yield strength; R m -tensile strength; A-total elongation after fracture (indeterminate gauge length); GB-granular bainite; M-martensite.

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Abstract

The invention relates a to tensile strength 780MPa grade complex phase steel sheet. Its chemical composition mass percent is as follows: 0.13-0.17%C, 0.20-0.40%Si, 1.30-1.50%Mn, 0.02-0.03%Nb, rest Fe. And its form is granular bainite and martensite complex phase; and the former volume fraction is 90-95%; the latter is 10-5%; yield strength 525- 550MPa tensile strength 785-795MPa breaking post general elongation is 20-25%. The invention adopts rolling by rolling and cooling control method. The start rolling temperature is 1100-1150 centigrade degree. The final is 800-850 centigrade degree. The first segment cooling speed is 40-70 centigrade degree per second. The second is 220-360. The temperature after cooling is 550-610 centigrade degree. Winding temperature is 20-250 centigrade degree. Steel sheet thickness is 3-4.5mm.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to the manufacture of high-strength steel for automotive structural parts, in particular to a multiphase steel plate with a tensile strength of 780MPa and a manufacturing method. Background technique [0002] The development of high-strength hot-rolled steel sheets for automobiles has always been one of the hot spots in the research of materials work at home and abroad. Generally used ferrite + pearlite hot-rolled steel plate has a maximum strength of 500MPa. Although adding microalloying elements such as Nb or Ti can further increase the strength, the formability will deteriorate, thus limiting its application. To further increase strength, dual phase steels have been developed. The characteristic of dual-phase high-strength steel is that about 15% of the hard phase is distributed on the fine ferrite matrix, and it is further strengthened by solid solution atoms. The resistanc...

Claims

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Application Information

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IPC IPC(8): C22C38/12B21B37/74C21D8/02C21D9/46C21D11/00
Inventor 刘彦春王国栋刘相华李艳梅朱伏先
Owner NORTHEASTERN UNIV
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