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Full-hard aluminum-zinc coated steel sheet and method for producing same

A production method and technology of galvanizing, applied in the direction of metal material coating process, coating, etc., can solve the problems of high temperature annealing, high annealing temperature, complicated steel plate process, etc., saving process and capital, and widely popularizing The effect of the application foreground

Active Publication Date: 2009-08-19
ANSC TKS GALVANIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a fully hard galvalume steel plate with high recrystallization temperature and its production for the above-mentioned problem that high-temperature annealing cannot be used in the production of full-hard galvalume steel plate, thereby complicating the subsequent process of the steel plate. method, use a higher annealing temperature, the strip steel does not go through reheating before entering the zinc pot, avoid adding heating equipment in the cooling section, and reduce the annealing temperature difference between the full-hard aluminum-zinc coated steel plate and the CQ aluminum-zinc coated steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] When the chemical composition (weight percentage) of the substrate is: C: 0.12% to 0.16%, Mn: 1.00% to 1.40%, Si≤0.05%, Ti: 0.015% to 0.04%, and the rest is iron and inevitable impurities.

[0033] The Ti content in steel is controlled by adding high-titanium ferro-titanium with a Ti content of about 70%. The thickness of the cast slab is 170~230mm; the heating temperature of hot rolling is 1150~1210℃, the finishing temperature of 900~1000℃, the cooling rate after rolling is 30~60℃ / s, the coiling temperature is 550~590℃; the reduction rate of cold rolling is 50 %~80%; It is produced by hot-dip galvanizing line with open flame furnace or with full-radiant tube hot-dip galvanizing line. The annealing temperature of hot-dip galvanizing is 630-660℃. The mechanical properties of steel are shown in Table 1.

[0034] Table 1 Mechanical properties of steel plate

[0035] Yield strength / (N·mm -2 )

Embodiment 2

[0037] When the chemical composition (weight percentage) of the substrate is: C: 0.02% to 0.08%, Mn: 0.15% to 0.40%, Si≤0.05%, Ti: 0.06% to 0.10%, and the rest is iron and inevitable impurities.

[0038] Use ordinary titanium iron with a Ti content of about 30% to control the titanium content in the steel; the thickness of the cast slab is 90~170mm; the heating temperature of hot rolling is 1200~1260℃, the finishing temperature of 950~1100℃, and the cooling rate after rolling is 30~60℃ / s, the coiling temperature is 590~650℃; the cold rolling reduction rate is 50%~70%; the hot-dip galvanizing line with open flame furnace or the hot-dip galvanizing line with full radiant tube is used, and the annealing temperature of hot-dip galvanizing is 680 ~710℃, the mechanical properties of steel are shown in Table 2.

[0039] Table 2 Mechanical properties of steel plate

[0040] Yield strength / (N·mm -2 )

Embodiment 3

[0042]When the chemical composition (weight percentage) of the substrate is: C: 0.08% to 0.12%, Mn: 0.60% to 0.80%, Si≤0.05%, Nb: 0.03% to 0.05%, and the rest is iron and unavoidable impurities.

[0043] The thickness of cast slab is 170~230mm; the heating temperature of hot rolling is 1200~1260℃, the finishing temperature is 950~1100℃, the cooling rate after rolling is 30~60℃ / s, the coiling temperature is 590~650℃; the cold rolling reduction rate is 50 %~80%; It is produced by hot-dip galvanizing line with open flame furnace or by hot-dip galvanizing line with full radiant tube. The annealing temperature of hot-dip galvanizing is 640~670℃. The mechanical properties of steel are shown in Table 3.

[0044] Table 3 Mechanical properties of steel plate

[0045] Yield strength / (N·mm -2 )

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Abstract

The invention discloses a fully hard galvanized steel plate and a production method thereof. The chemical composition of the substrate is: (weight percentage) C: 0.02% to 0.16%, Mn: 0.15% to 1.50%, Si≤0.05%, Ti and Nb is added alone or at the same time, the total content of Ti and Nb is 0.015% to 0.100%, and the rest is iron and unavoidable impurities. The characteristics of its production process are: hot rolling heating temperature 1150 ~ 1260 ℃, finishing rolling temperature 900 ~ 1100 ℃, The cooling rate after rolling is 30-60°C / s, the coiling temperature is 550-650°C, the reduction rate of cold rolling is 50%-80%, the annealing temperature is 630-710°C during galvanizing, and the hot-dip galvanizing line with open flame furnace or Produced on a hot-dip galvanizing line with full radiant tubes. The cooling section of the annealing furnace does not need to be reheated, and the yield strength of the steel plate reaches more than 600MPa, which solves the problem that the cooling section of the annealing furnace must be equipped with heating for the production of full-hard galvanized steel sheets, saves procedures and funds, and has broad application prospects. .

Description

Technical field [0001] The invention belongs to the technical field of cold-rolled sheet production, and relates to a cold-rolled sheet of hot-dip galvanizing, in particular to a full-hard galvanized steel sheet and a production method thereof. technical background [0002] Full-hard coated steel sheet refers to the cold-rolled strip steel that is directly immersed in the plating solution without recrystallization. Such coated steel sheets generally use low-carbon cold-rolled thin steel sheets with a carbon content of about 0.06% as raw materials to retain work hardening produced by cold rolling. The yield strength of the steel sheet is generally greater than 550MPa, and the tensile strength is generally greater than 570MPa. Although the toughness of this kind of steel plate is poor, the elongation is generally not more than 7%, but because of its low-cost characteristics, it has more applications in the construction industry that does not require high processing performance. [...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14C23C30/00
Inventor 李锋吕家舜文伟徐伟军张清辉敖列哥
Owner ANSC TKS GALVANIZING
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