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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 steel strip during annealing, which will reduce the wettability of galvanizing and cause missing plating. and other defects, and will deteriorate the spot weldability of galvanized sheet, so the addition of Si is strictly controlled in production

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

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Embodiment Construction

[0025] The chemical composition of the embodiment of the present invention is as shown in Table 1. After smelting, the billet forging size 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 rolling start temperature is ≥1150°C, and the final rolling temperature is controlled at about 850°C, then water cooled to the coiling temperature of 650°C, put into the holding furnace to cool with the furnace, Simulate the coiling process. The hot-rolled sheet is cold-rolled after pickling, and the cold-rolled reduction rate is about 70%.

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

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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...

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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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