High-toughness hot-formed steel with tensile strength higher than or equal to 1800 MPa grade and production method thereof

A technology of tensile strength and hot-formed steel, applied in the field of metallurgy, can solve the problems of low toughness and cold-bending performance, and achieve the effects of improving toughness and cold-bending performance, uniform distribution of tissue components, and improving cold-bending performance

Inactive Publication Date: 2019-10-08
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low toughness and low cold bending properties of hot-formed steel with tensile strength ≥ 1800 MPa in the prior art, the present invention provides a high-toughness hot-formed steel with tensile strengt

Method used

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  • High-toughness hot-formed steel with tensile strength higher than or equal to 1800 MPa grade and production method thereof
  • High-toughness hot-formed steel with tensile strength higher than or equal to 1800 MPa grade and production method thereof
  • High-toughness hot-formed steel with tensile strength higher than or equal to 1800 MPa grade and production method thereof

Examples

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Example Embodiment

[0054] Example 1

[0055] The present invention is a high-toughness hot forming steel with a tensile strength of ≥1800MPa, and the mass percentage of each component is: C0.29~0.35%, Si≤0.5%, Mn 0.5~1.5%, P≤0.020%, S≤ 0.010%, Cr≤0.50%, Al 0.01~0.06%, Nb 0.01~0.06%, V 0.01~0.06%, Mo≤0.5%, the rest is Fe and unavoidable impurities.

[0056] Use the following process to produce:

[0057] 1. Smelting;

[0058] 2. Cast slab;

[0059] 3. Hot rolling: Hot rolling of the cast slab, where the tapping temperature is 1000~1250℃, the final rolling temperature is 850~900℃, and the coiling temperature is 500~600℃;

[0060] 4. Cold rolling: pickling the product after hot rolling, and then cold rolling, in which cold rolling reduction is ≥50%;

[0061] 5. Annealing: Continuously anneal the cold-rolled products at 700~820℃;

[0062] 6. Hot forming: After annealing, the product is subjected to hot stamping, the heating temperature is 800-1000℃, the heating time is 3-10min, the holding time is 4-10s, and the...

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Abstract

The invention discloses a high-toughness hot-formed steel with tensile strength higher than or equal to the 1800 MPa grade and a production method thereof, and belongs to the technical field of metallurgy. The high-toughness hot-formed steel with the tensile strength higher than or equal to the 1800 MPa grade comprises components including, by mass, 0.29%-0.35% of C, not larger than 0.5% of Si, 0.5%-1.5% of Mn, not larger than 0.020% of P, not larger than 0.010% of S, not larger than 0.50% of Cr, 0.01%-0.06% of Al, 0.01%-0.06% of Nb, 0.01%-0.06% of V, not larger than 0.5% of Mo and the balanceFe and inevitable impurities. The high-toughness hot-formed steel is produced by the following processes including smelting, blank casting, hot rolling, cold rolling, annealing and hot forming. According to the high-toughness hot-formed steel and the production method, specific component alloy elements are added, the specific production processes are used in cooperation, and therefore the manufactured steel has the tensile strength higher than or equal to the 1800 MPa and has high toughness and high cold bending property.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a high-toughness hot-formed steel with a tensile strength ≥ 1800 MPa and a production method thereof. Background technique [0002] Automobile lightweight technology is one of the key technologies to adapt to the trend of modern automobile safety, energy saving and environmental protection. At present, more and more automobile body parts use thermoforming technology (such as: automobile bumpers, anti-collision beams, A-pillars, B-pillars , door bumper, etc.). Thermoforming technology is a new process that divides forming and strengthening into two steps to produce ultra-high-strength auto parts. The produced parts have the advantages of ultra-high strength, high forming precision, and no springback. [0003] At present, the hot-formed steel widely used in the market is 1500MPa strength level. As the laws and regulations on automobile energy consumption and saf...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C21D1/26C21D1/18C21D8/04
CPCC21D1/18C21D1/26C21D8/0405C21D8/0426C21D8/0436C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 晋家春詹华崔磊肖洋洋谷海容刘永刚冷德平马二清董标
Owner MAANSHAN IRON & STEEL CO LTD
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