Excellent-cold-bending-performance steel plate with yield strength larger than 1100 MPa and manufacturing method thereof
A technology of yield strength and cold bending performance, applied in the field of iron and steel metallurgy, can solve the problems of difficult to guarantee ultra-low temperature toughness, difficult to guarantee the cold bending performance of steel plates, and waves at the edge and core of the steel plate, so as to reduce the delayed cracking and bending of the steel plate. The risk of bending cracks, the cost saving of alloys, and the effect of stable performance
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[0062] The thickness of the test steel plate of Example 1 is 5 mm. The plate shape is very good, and the unevenness is ≤3mm / m.
[0063] image 3 It is the morphology of the test steel plate of Example 2 after 180° bending according to the national standard GB / T232 laboratory. The bending diameter d=3a. No cracks were seen after bending, and the surface was good.
[0064] After the 90° whole plate of the test steel in Examples 1 and 4 was cold-formed, the width b of the steel plate was ≥500mm, and the length L=2000mm. The cold bending radius r=3.0a, where a is the thickness of the steel plate. After cold bending, the surface of the steel plate is good without cracks.
[0065] The invention adopts controlled rolling and controlled cooling and quenching + strong cold straightening process to control from the angles of chemical composition design, base material structure, inclusions, central segregation, quenching temperature and time, etc., to ensure that the steel's Elongation, -...
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