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Cold-based ultra-high strength galvanized sheet for structures and production method thereof

A technology of ultra-high strength and production method, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problem of increasing manufacturing cost of galvanized sheet production process, not suitable for galvanized sheet production, and increasing manufacturing cost and other issues, to increase equipment costs and maintenance costs, ensure the mechanical properties of finished products, and reduce production costs

Inactive Publication Date: 2014-05-14
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Publication No. CN101871078A discloses an ultra-high-strength cold-rolled steel and its manufacturing method. It adds Cr and a Mn alloy that promotes the formation of martensite, and Si that improves the tempering resistance of martensite, and then uses rapid cooling equipment The cooling rate reaches 500℃ / s to produce ultra-high-strength cold-rolled steel. This process requires the addition of too much Mn and Si alloys, which has little effect on the production of cold-rolled sheets, but it will affect the adhesion of the galvanized coating. Not suitable for galvanized production, and need to add expensive rapid cooling and subsequent tempering equipment, which increases the manufacturing cost
[0008] Publication No. CN101928873A, a processing method for high-strength and ultra-high-strength steel plates, Publication No. CN102071359A, an ultra-high-strength automotive structural steel and its production method, and Publication No. CN102286701A, a thick plate for ultra-high-strength hull structures and its production method, All of them increase the strength by adding one or several alloys of Mn, Nb, Ti, Si, and produce high-strength hot-rolled products, which increase the manufacturing cost and are not suitable for the production process of galvanized sheet
[0009] The production technology of high-strength steel plate mentioned above may increase the strength of the product by adding rapid cooling equipment to form martensite at a very high cooling rate, or increase some alloying elements to produce general-strength galvanized sheets, or even add more alloying elements to produce Ultra-high-strength hot-rolled or cold-rolled sheets, the result is either insufficient strength, or increased manufacturing costs, and even some processes will seriously affect the surface quality of galvanized coatings, which are not suitable for the production of galvanized sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The cold-base ultra-high-strength galvanized sheet used in this structure adopts the following composition and production method.

[0024] The chemical composition distribution ratio of ultra-high-strength galvanized sheet (mass percentage) is as follows: C 0.18%; Si 0.06%; Mn 0.36%; P 0.012%; S 0.0078%; Als 0.016%; Fe balance.

[0025] The main technological process and parameters: in the hot rolling process, the furnace discharge temperature is 1130℃, the final rolling temperature is 886℃, the coiling temperature is 585℃; the cumulative reduction rate of cold rolling is 65%; the annealing heating temperature in the galvanizing process is 563℃, heating Time is 160s, soaking temperature is 565℃, soaking time is 35s.

[0026] The resulting ultra-high-strength galvanized sheet finished product has a yield strength of 610MPa, a tensile strength of 665MPa, and an elongation rate of 19%.

Embodiment 2

[0027] Example 2: The cold-base ultra-high-strength galvanized sheet used in this structure adopts the following composition and production method.

[0028] The chemical composition distribution ratio of ultra-high-strength galvanized sheet is as follows (mass percentage): C 0.23%; Si 0.07%; Mn 0.30%; P 0.008%; S 0.009%; Als 0.02%; Fe margin.

[0029] Main technological process and parameters: in the hot rolling process, the furnace temperature is 1140℃, the final rolling temperature is 870℃, the coiling temperature is 580℃; the cumulative reduction rate of cold rolling is 60%; the annealing heating temperature in the galvanizing process is 563℃, heating Time 150s, soaking temperature 565℃, soaking time 30s.

[0030] The resulting ultra-high-strength galvanized sheet finished product has a yield strength of 665MPa, a tensile strength of 730MPa, and an elongation of 13.5%.

Embodiment 3

[0031] Example 3: The cold-base ultra-high-strength galvanized sheet used in this structure adopts the following proportions of ingredients and production methods.

[0032] The chemical composition distribution ratio of ultra-high-strength galvanized sheet is as follows (mass percentage): C 0.189%; Si 0.16%; Mn 0.4%; P 0.01%; S 0.007%; Als 0.033%; Fe balance.

[0033] Main technological process and parameters: in the hot rolling process, the furnace temperature is 1150℃, the final rolling temperature is 880℃, the coiling temperature is 583℃; the cumulative reduction rate of cold rolling is 58%; the annealing heating temperature in the galvanizing process is 565℃, heating Time 135s, soaking temperature 565℃, soaking time 26s.

[0034] The resulting ultra-high-strength galvanized sheet finished product has a yield strength of 680MPa, a tensile strength of 776MPa, and an elongation rate of 13%.

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Abstract

The invention discloses a cold-based ultra-high strength galvanized sheet for structures and a production method thereof. The cold-based ultra-high strength galvanized sheet comprises the following chemical components in percent by mass: 0.18-0.25% of C, 0.16-0.17% of Si, 0.3-0.4% of Mn, less than or equal to 0.012% of P, less than or equal to 0.009% of S, 0.016-0.035% of Al and the balance of Fe. The percent by mass of the Mn content in the galvanized sheet is only 0.3-0.4%, and other alloying elements are not added, so that the production cost is reduced; in order to ensure the mechanical property of the finished product, the cold rolling working procedure and the continuous annealing galvanization working procedure are correspondingly adjusted in the production process, so that the consumption of energy sources is reduced, and the production cost is further reduced; rapid-cooling equipment is not adopted, so that the equipment cost and the maintenance cost are not increased. The product is the galvanized sheet and has the characteristics of high strength, high ductility and high corrosivity. Upon inspection, the yield strength of the product is 600-700Mpa, the tensile strength of the product is 660-786Mpa, and the ductility of the product is 12-20%. The product meets the performance requirements of the cold-based ultra-high strength galvanized sheet.

Description

Technical field [0001] The invention relates to a galvanized sheet and a production method, in particular to a cold-base ultra-high-strength galvanized sheet for a structure and a production method thereof. Background technique [0002] Due to its higher corrosion resistance, galvanized structural plates are gradually replacing cold-rolled structural plates, and are increasingly developing towards higher strength. At present, the production of high-strength galvanized sheet for structural use mostly uses ordinary carbon steel to increase the strength of the product by adding Mn alloy, or for ultra-high-strength galvanized sheet (yield strength greater than 500MPa), in order to ensure its forming performance, another one is added Or several alloying elements (such as Nb, Cr, etc.) to increase the strength of the final product and ensure a certain elongation, thereby increasing production costs and worsening galvanizing performance, and even adding more expensive rapid cooling equi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/02C23C2/06C23C2/40
Inventor 许斌吝章国谷凤龙孙海燕刘守显韩冬闫磊石建强孙电强
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY