1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel and preparation method thereof

A dual-phase steel and hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve problems such as missed plating, deterioration of spot weldability of galvanized sheet, and reduction of galvanized wettability , to achieve the effect of strong weldability and platability, high work hardening rate and high tensile strength

Inactive Publication Date: 2015-04-29
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The ultra-high-strength dual-phase steel developed in the past often increases the strength by adding Si, but the addition of Si will cause the hot-dip galvanized dual-phase steel to be easily enriched and oxidized on the surface of the s

Method used

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  • 1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel and preparation method thereof
  • 1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel and preparation method thereof
  • 1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel and preparation method thereof

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[0025] The chemical components of the examples of the present invention are shown in Table 1. The forging size of the cast billet after smelting is 30mm (thickness) × 90mm (width) × 90mm (length) billet. After forging, the billet is soaked at 1250°C for 1 hour, hot rolled to 3.5mm, the start rolling temperature is ≥1150°C, the final rolling temperature is controlled at about 850°C, and then water-cooled to the coiling temperature of 650°C, and then placed in the holding furnace to cool down. Simulate the winding process. The hot-rolled sheet is cold-rolled after pickling, and the cold-rolling reduction rate is about 70%.

[0026] Schematic diagram of hot-dip galvanizing annealing process figure 1 As shown, the cold-rolled sheet is heated to the two-phase zone at a rate of 5°C / s for annealing at 780°C, 800°C and 820°C, holding for 120s, then slowly cooled to 680°C at 7°C / s, and then at 22°C. The cooling rate of ℃ / s is quickly cooled to 460℃ and enters the zinc pot, galvanized fo...

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Abstract

The invention belongs to the technical field of cold-rolled high-aluminum hot-dip-galvanized super-high-strength steel plates for automobiles, and relates to 1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel and a preparation method thereof. The 1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel comprises the following chemical components by mass percent: 0.10%-0.18% of C, 1.4%-1.9% of Mn, 0.20%-0.60% of Cr, 0.10%-0.40% of Mo, not more than 0.050% of Si, 0.50%-0.90% of Al, not more than 0.0030% of S, not more than 0.0090% of P, not more than 0.0050% of N and the balance of Fe and inevitable impurity elements. Si is replaced with Al, so that the galvanizing defects such as plating leakage caused by enrichment oxidation of Si on the surface of a steel plate are overcome; meanwhile, the strength and the tenacity of the steel are improved by adding Mn, Cr and Mo, so that the steel is good in strength-toughness ratio and usability, and the strength level can reach more than 1,000 MPa.

Description

technical field [0001] The invention relates to the technical field of cold-rolled high-aluminum hot-dip galvanized ultra-high-strength steel sheets for automobiles, and provides a 1000MPa-grade cold-rolled high-aluminum hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique [0002] With the continuous deepening of the concepts of weight reduction, energy saving, environmental protection and safety of automobiles, advanced high-strength steels such as dual-phase steels have attracted more and more attention. Due to its good strength and ductility matching, high initial work hardening rate, high impact absorption energy and low yield-tensile ratio, dual-phase steel has gradually become an important material for automobile manufacturing. In the body structure designed by the ultra-light steel car body-advanced car concept project, the dual-phase steel with a tensile strength of 1000MPa accounts for the largest proportion, accounting for abo...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/22C23F17/00C21D8/02C23C2/06
Inventor 江海涛卢淋唐荻米振莉李志超段晓鸽吴彦欣
Owner UNIV OF SCI & TECH BEIJING
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