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A kind of plastic enhanced tensile strength 590mpa grade cold-rolled dual-phase steel and production method thereof

A tensile strength, dual-phase steel technology, applied in the field of metallurgical sheet production, to achieve the effect of improving plasticity

Active Publication Date: 2020-12-18
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing cold-rolled dual-phase steel with a tensile strength of 590MPa, there are few technical solutions for plasticity enhancement with both high elongation and high flanging

Method used

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  • A kind of plastic enhanced tensile strength 590mpa grade cold-rolled dual-phase steel and production method thereof
  • A kind of plastic enhanced tensile strength 590mpa grade cold-rolled dual-phase steel and production method thereof
  • A kind of plastic enhanced tensile strength 590mpa grade cold-rolled dual-phase steel and production method thereof

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with examples.

[0033] The cold-rolled dual-phase steel production steps and process parameter control ranges in each embodiment are as follows:

[0034] 1) According to the process route of molten iron pretreatment→converter smelting→alloy fine-tuning→LF furnace refining→continuous casting, it is smelted and poured into billets;

[0035]2) The slab is heated to 1200-1240°C, after dephosphorization and 6 passes of rough rolling, and 7 passes of finish rolling, the start temperature of finish rolling is 1000-1080°C, the outlet temperature is 840-890°C, the Flow cooling to 480 ~ 530 ℃, then coiled and air cooled;

[0036] 3) Cold rolling after conventional pickling, the cold rolling reduction rate is 55-80%;

[0037] 4) Carry out continuous annealing, the steel coil is heated to 780-820°C, and after heat preservation, it is slowly cooled to 650-700°C at a cooling rate of 6-16°C / s, and then cooled at...

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Abstract

The invention discloses a plastic reinforced tensile strength 590 MPa grade cold-rolled dual-phase steel and a production method thereof. The cold-rolled dual-phase steel comprises the following chemical components of, in percentage by weight, 0.06%-0.07% of C, 0.3%-0.6% of Si, 1.4%-1.6% of Mn, 0.015%-0.030% of Ti, 0.03%-0.06% of Al, 0.0004%-0.0012% of B, less than or equal to 0.015% of P, less than or equal to 0.006% of S, less than or equal to 0.005% of N, and the balance Fe and unavoidable impurities. The titanium-boron composite microalloyed low carbon-low manganese component design and low temperature coiling process is adopted, the tensile strength 590 MPa grade cold-rolled dual-phase steel with a uniform elongation of 16.5%-21.0%, a local elongation of not less than 10% and a specific elongation A80 of 27.0%-31.5% is produced, and the plastic reinforced tensile strength 590 MPa grade cold-rolled dual-phase steel is suitable as a high-draw and high-flanging complex shaped automobile part.

Description

technical field [0001] The invention belongs to the technical field of metallurgical plate production, and in particular relates to a plastically enhanced cold-rolled dual-phase steel with a tensile strength of 590MPa and a production method thereof. Background technique [0002] No matter from the perspective of cost or performance, high-strength steel plate is the best material to meet the requirements of lightweight body and crash safety. At present, high-strength dual-phase steel is widely used in automobile manufacturing, and its tensile strength grade covers 440MPa~1180MPa. However, in actual use, it is found that traditional dual-phase steels are difficult to meet the forming requirements of many high-drawing and high-flange parts. Although Q&P steel, DH steel, medium manganese steel and TWIP steel with higher strength and plasticity can be used, they must add higher content of alloying elements to obtain retained austenite, which has problems of difficult production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D1/26C21D8/02
CPCC21D1/26C21D8/0226C21D8/0236C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 郑笑芳崔磊顾斌张军马明璐肖洋洋景宏亮
Owner MAANSHAN IRON & STEEL CO LTD
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