High-hole-expansion-ratio steel plate with tensile strength of 780 MPa and manufacturing process thereof
A tensile strength and steel plate technology, which is applied in the field of high tensile strength 780MPa high hole-expanding steel plate and its manufacturing field, can solve the problems of large composition range, fluctuation of mechanical properties of steel plate, poor manufacturability, etc., and achieve good hole-enlarging performance. , the uniformity of the organization, the effect of low production cost
Active Publication Date: 2014-02-26
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD +1
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Problems solved by technology
This process adopts two-stage cold rolling to produce hot-rolled steel plates with ferrite and bainite dual-phase structure and tensile strength greater than 690MPa. Management will lead to fluctuations in the mechanical properties of steel plate products and poor manufacturability
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[0040] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0041] Table 1 is the composition of the steel of the embodiment of the present invention, and Table 2 is the hot rolling process of the steel of the embodiment of the present invention. Table 3 shows the mechanical properties of the steel gauges of the examples of the present invention.
[0042] The sample of the embodiment of the present invention is smelted by converter, RH+LF double refining treatment, continuous casting, slab heating temperature plus 1200-1260°C, final rolling temperature 860-930°C, cooling at a cooling rate greater than 30°C / s, The steel plate is coiled at a temperature of 480-580°C, and the steel coil is air-cooled to room temperature after coiling.
[0043] Comparative Example 1 and Comparative Example 2 are generally commercial materials of the same grade. The high hole reaming steel with a tensile strength of 780MPa in the i...
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Abstract
A high-reaming-ratio steel plate with tensile strength of 780 MPa and a manufacturing process thereof are disclosed. The high-reaming-ratio steel plate with tensile strength of 780 MPa comprises the chemical components in percent by weight: 0.02-0.1% of C, 0.5-1.5% of Si, 1.5-2.2% of Mn, 0.02% or less of P, 0.003% or less of S, 0.020-0.060% of Al, 0.005% or less of N, 0.02-0.06% of Nb, 0.05-0.15% of Ti, less than 0.0050% of Ca, 0-0.005% of Mg, and the balance Fe and unavoidable impurities, wherein ([C]-12 / 48*([Ti]-48 / 14*[N])-12 / 93*[Nb])>=0.005. The reaming ratio lambda of the high-reaming ratio steel plate with tensile strength of 780 MPa is 50% or more, and the high-reaming ratio steel plate with tensile strength of 780 MPa can satisfy the high-strength lightweight demands of Chinese automobile industrial chassises.
Description
technical field [0001] The invention relates to a high-hole-expanding steel plate, in particular to a high-hole-expanding steel plate with a tensile strength of 780MPa and a manufacturing method thereof. 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 780MPa steel plate (80 kg grade) is strengthened by low alloy precipitation, and the hole expansion rate of the steel plate is between 30% and 40%. With the development of lightweight automobiles, more and more ...
Claims
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IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 郑建平庞厚君
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD