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A kind of tensile strength 540mpa level high reaming steel plate and its manufacturing method

A technology of tensile strength and steel plate, which is applied in the field of high reaming steel plate, can solve the problems of affecting Ti/C and failing to obtain a high reaming rate, and achieve the effect of uniform structure, reducing cracking sensitive points, and preventing structure segregation

Active Publication Date: 2016-08-24
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patent WO2009118945 (C101978083) discloses a hot-rolled high-hole expansion steel with a carbon content of 0.015-0.04%, and its tensile strength is also ≥520MPa, but does not contain Nb alloy components. According to the requirements of this patent, after adding Nb, due to niobium carbide The precipitation will affect the Ti / C ratio and cannot obtain a high hole expansion rate

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  • A kind of tensile strength 540mpa level high reaming steel plate and its manufacturing method
  • A kind of tensile strength 540mpa level high reaming steel plate and its manufacturing method
  • A kind of tensile strength 540mpa level high reaming steel plate and its manufacturing method

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0042] Table 1 is the chemical composition of the steel of the embodiment of the present invention, Table 2 is the corresponding hot rolling process of the steel of the embodiment of the present invention, and Table 3 is the mechanical properties of the steel of the embodiment of the present invention.

[0043] The sample of the embodiment of the present invention is smelted by converter, desulfurized by LF furnace, continuous casting, slab heating temperature is 1180-1250 °C, final rolling temperature is 850-910 °C, cooled at a cooling rate greater than 30 °C / s, the steel plate is Coil at a temperature of 480-580°C, and air-cool the steel coil to room temperature after coiling.

[0044] Comparative Example 1 and Comparative Example 2 are generally commercial materials of the same grade. figure 1 , figure 2 They are respectively the metallographic st...

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Abstract

A high-reaming steel plate with a tensile strength of 540MPa and a manufacturing method thereof, the chemical composition weight percent of which is: C: 0.02-0.1%, Si: 0.1-1.2%, Mn: 1.5-2.20%, P≤0.02%, S ≤0.003%, Al: 0.020~0.060%, Nb: 0.005~0.05%, Ca<0.0050%, the rest are Fe and unavoidable impurities; among them, ([C]×[Nb])≤0.001, [Mn] / [ Si]=2~5, the product of steel plate strength and hole expansion ratio TSxλ≥48000MPa%. The high-hole-expanding steel plate of the present invention has a tensile strength greater than 540 MPa and 590 MPa, and the hot-rolled high-hole-expanding steel plate meets the requirements of high-strength and light-weight chassis of the Chinese automobile industry.

Description

technical field [0001] The invention relates to a high hole expansion steel plate, in particular to a high hole expansion steel plate with a tensile strength greater than 540MPa. Background technique [0002] Hot-rolled and hot-rolled pickled sheets are widely used in automobile chassis, wheels and body structure parts, and they account for about 28% of the steel used in automobiles. The strength and rigidity of the parts can be improved through the shape design of the flanging and local reaming of the auto parts, and the purpose of thinning and lightening the auto steel plate can be achieved. The hole expansion performance of the steel plate is related to the composition, strength and structure uniformity of the steel plate. The traditional 540MPa steel plate (55 kg grade) is strengthened by low alloy precipitation, and the hole expansion rate of the steel plate is between 40% and 60%. With the increasing requirements of automobile design on the chassis structure, the form...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21C7/064C21D8/02C23G1/08
Inventor 郑建平庞厚君
Owner BAOSHAN IRON & STEEL CO LTD