A kind of low yield strength ratio ultra-high strength cold-rolled steel plate and preparation method thereof
A cold-rolled steel plate with low yield ratio technology, which is applied in the field of high-strength steel production, can solve the problem of high content of massive ferrite phase, and achieve good mechanical properties, simple process control, and easy process control
Inactive Publication Date: 2015-09-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
Due to the large content of massive ferrite phase with low strength in the structure, the tensile strength of the steel plate of the embodiment is less than 1100MPa
Method used
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[0026] For the specific embodiments of the present invention, refer to Tables 1 to 3. Table 1 shows the chemical components of the examples, Table 2 shows the process parameters used in the examples, and Table 3 shows the mechanical properties of the examples. Figure 1a is a typical metallographic structure diagram of Example 1 of the present invention; Figure 1b It is a typical metallographic structure diagram of Example 2 of the present invention.
[0027] Table 1 The chemical composition of the embodiment (wt%)
[0028] Ingredient number
C
the si
Mn
P
S
AL
Ingredient 1
0.23
1.96
2.31
＜0.01
＜0.01
＜0.03
ingredient 2
0.27
1.31
2.08
＜0.01
＜0.01
＜0.03
[0029] Table 2 Process parameters used in the embodiment
[0030]
[0031] Table 3 Mechanical properties of the examples
[0032]
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Abstract
The invention discloses an ultrahigh strength cold rolled steel plate with low yield ratio and a production method thereof. The steel plate comprises the following ingredients by mass percent: 0.20-0.35 percent of C, 1.0-2.5 percent of Si, 1.0-2.5 percent of Mn and the balance of Fe and inevitable impurities. The production method comprises the steps that raw steel blanks smelted according to the ingredients are heated and insulated and then hot rolled for multiple times; the rolled steel blanks are cooled to 640-720 DEG C and then coiled; and the obtained hot rolled blanks are subjected to oxide removal based on acid pickling and then cold rolled; the cold rolled blanks are heated and then cooled to 780-830 DEG C, are cooled to 200-350 DEG C and insulated, and are finally slowly cooled to the room temperature. The yield strength of the ultrahigh strength cold rolled steel plate with low yield ratio produced according to the method is smaller than 800 MPa, the tensile strength is more than 1200 MPa, the yield ratio is smaller than 0.65, the elongation reaches 14 percent above, and the product of tensile strength and elongation reaches more than 18000 MPa. percent. The microstructure of the steel plate is fine lath carbide-free bainite as well as film-shaped retained austenite and block-shaped retained austenite which are distributed on a bainite matrix, and also can have extremely little tempered martensite.
Description
technical field [0001] The invention belongs to the field of high-strength steel production, and relates to a low yield ratio, ultra-high-strength cold-rolled sheet steel and a preparation method thereof. Background technique [0002] In recent years, from the viewpoint of improving the crash safety and weight reduction of automobiles, it is necessary to press high-strength steel sheets with good formability for vehicle body structural parts, and TRIP steel has attracted attention as a response to this demand. TRIP steel plate has high yield strength and tensile strength, strong ductility, high stamping ability, can be made into more complex parts, and has high impact absorption performance. pass out. Due to its unique strengthening and toughening mechanism and high strength and toughness, it is recognized as a new generation of high-strength steel plates for automobiles. Parts that can be used for automobiles to absorb collision energy, such as bumpers and bumper ribs, im...
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IPC IPC(8): C22C38/04C21D8/02C21D9/46
Inventor 苏岚陈银莉王泽汉唐荻赵爱民
Owner UNIV OF SCI & TECH BEIJING