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An economical high-strength hot-rolled galvanized sheet and its manufacturing method

A manufacturing method and high-strength technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of low strength and low resource utilization rate of hot-rolled substrate galvanized sheet

Active Publication Date: 2016-11-30
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an economical high-strength hot-rolled galvanized base plate and its manufacturing method to solve the problems of low strength and low resource utilization of the hot-rolled galvanized base plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Chemical composition of steel: C0.15%, Si0.55%, Mn1.60%, P≤0.020%, S≤0.020%, Al0.02%, Ti0.02%, the rest is Fe and some unavoidable impurity elements . Manufacturing process: After smelting, casting, hot-rolling, and pickling of the steel of the above composition, the steel plate is hot-dip galvanized in a continuous hot-dip galvanizing production line to obtain an ultra-high-strength hot-rolled substrate galvanized sheet. Hot rolling finish temperature: 850°C, start and cool temperature: 730°C, cooling rate ≥ 30°C / s, crimping temperature: 240°C, thickness specification: 3.0mm; hot-dip galvanizing heating and holding temperature: 460°C, The holding time is: 120s, and the composition of the plating solution is: zinc solution (containing 0.3% Al).

[0026] The organization is: 50% F+45% tempered M+5% residual A.

[0027] Finished product performance: Yield strength 620MPa, tensile strength 1030MPa, elongation 19%, coating adhesion is good, surface quality meets FB surfac...

Embodiment 2

[0029] Chemical composition of steel: C0.15%, Si0.01%, Mn1.10%, P≤0.020%, S≤0.020%, Al0.90%, V0.10%, the rest is Fe and some unavoidable impurities element.

[0030] Manufacturing process: After smelting, casting, hot-rolling, and pickling of the steel of the above composition, the steel plate is hot-dip galvanized in a continuous hot-dip galvanizing production line to obtain an ultra-high-strength hot-rolled substrate galvanized sheet. Hot rolling finish temperature: 880°C, start and cool temperature: 700°C, cooling rate ≥ 15°C / s, crimping temperature: 300°C, thickness specification: 5.0mm; hot-dip galvanizing heating and holding temperature: 460°C, The holding time is: 120s, and the composition of the plating solution is: zinc solution (containing 0.3% Al).

[0031] The structure is: 60% F+35% tempered M+5% residual A.

[0032] Finished product performance: Yield strength 580MPa, tensile strength 1010MPa, elongation 21%, coating adhesion is good, surface quality meets FB s...

Embodiment 3

[0034] Chemical composition of steel: C0.65%, Si1.70%, Mn5.00%, P≤0.020%, S≤0.020%, Al0.02%, Nb0.05%, the rest is Fe and some unavoidable impurities element.

[0035] Manufacturing process: After smelting, casting, hot-rolling, and pickling of the steel of the above composition, the steel plate is hot-dip galvanized in a continuous hot-dip galvanizing production line to obtain an ultra-high-strength hot-rolled substrate galvanized sheet. Hot rolling finish temperature: 900°C, start and cool temperature: 850°C, cooling rate ≥ 30°C / s, crimping temperature: 200°C, thickness specification: 4.0mm; hot-dip galvanizing heating and holding temperature: 480°C, The holding time is: 160s, and the composition of the plating solution is: zinc solution (containing 0.5% Al).

[0036] The organization is: 88% tempered M+12% residual A.

[0037] Finished product performance: Yield strength 980MPa, tensile strength 1220MPa, elongation 12%, coating adhesion is good, surface quality meets FA le...

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Abstract

The invention discloses an economical high-strength hot-rolled substrate galvanized sheet, C0.15%-0.65%, Si0.01%-3.50%, Mn1.10-5.00%, P≤0.50%, S≤0.030%, Al0 .02%~3.00%, V≤0.50%, Ti≤0.20%, Nb≤0.20%. The finishing temperature of hot rolling is controlled in the austenite zone, the cooling start temperature is controlled in the austenite zone or the two-phase zone of austenite and ferrite, and the M of the steel at the end of cooling is s Point and M f The temperature between the points, and then coiled; the hot-rolled sheet is immediately hot-dip galvanized after pickling, and the steel sheet is heated to 450-600°C in the continuous hot-dip galvanizing production line, and the holding temperature is 450-600°C, and then hot-dip galvanized.

Description

technical field [0001] The invention belongs to the field of continuous production and manufacture of hot-rolled substrate galvanized steel sheets, in particular to an economical high-strength hot-rolled substrate galvanized sheet and a manufacturing method thereof. Background technique [0002] Due to the progress of hot rolling process technology, especially the commissioning of a batch of thin slab continuous casting and rolling production lines, the production quantity of thin gauge (<2.5mm thick) hot rolled strip steel has greatly increased. At present, the thinnest can reach 0.8mm. Thin gauge hot-rolled pickled galvanized sheet provides the raw material to replace hot-dip galvanized or organically coated cold-rolled strip in a wide range of applications. In addition, thin-gauge hot-rolled pickled galvanized sheet is also used in its traditional application fields, such as construction industry, cold-formed steel structural parts, etc.; Highway guardrail board and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C21D8/02C23C2/40
Inventor 吕家舜李锋杨洪刚周芳刘仁东黄秋菊
Owner ANGANG STEEL CO LTD
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