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Extra-deep drawing IF steel and annealing process thereof

An annealing process and ultra-deep drawing technology, applied in the field of metallurgy, to achieve the effects of good product performance, less construction investment and low production cost

Inactive Publication Date: 2012-07-18
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional annealing process is based on continuous or bell annealing of cold-rolled coils, and there are few reports on the secondary annealing process of the annealed steel strip.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The chemical composition and weight percentage of cold-rolled sheet are: C 0.008%, Si 0.008%, Mn 0.13%, P 0.006%, S 0.005%, Ti 0.055%, Nb 0.019%, Alt 0.03%, the rest is Fe and cannot Trace impurities detected. Rolling is carried out according to the cold rolling process in Table 1, and the thickness of the sheet is cold rolled from 1.14mm to 0.47mm.

[0009] Table 1 cold rolling process

[0010] Thickness mm

first pass

second pass

third pass

Fourth pass

fifth pass

Finished Thickness mm

1.14

22.8％

12.5％

22％

16.6％

10

0.47

[0011] The annealing process is as follows: the intermediate annealing treatment is: the heating rate is 6°C / min, the annealing temperature is 720°C, the holding time is 48 hours, and is cooled with the furnace; the secondary annealing adopts continuous heating, the heating rate is 6°C / min, and the second The annealing temperature is 700°C, the holding time is 2 hour...

Embodiment 2

[0015] The chemical composition and weight percentage of cold-rolled sheet are: C 0.008%, Si 0.008%, Mn 0.13%, P 0.006%, S 0.005%, Ti 0.055%, Nb 0.019%, Alt 0.03%, the rest is Fe and cannot Trace impurities detected. Rolling is carried out according to the cold rolling process in Table 1, and the thickness of the sheet is cold rolled from 1.14mm to 0.47mm.

[0016] The annealing process is as follows: the intermediate annealing treatment is: the heating rate is 6°C / min, the annealing temperature is 720°C, the holding time is 48 hours, and is cooled with the furnace; the secondary annealing adopts continuous heating, the heating rate is 6°C / min, and the second The annealing temperature is 720°C, the holding time is 2 hours, and the furnace is cooled to 450°C and air-cooled. The mechanical properties of the IF steel samples after the above-mentioned secondary annealing process are shown in Table 2. The mechanical properties of the cold-rolled sheet after annealing at 720°C are ...

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Abstract

Extra-deep drawing IF steel and an annealing process thereof belong to the technical field of metallurgy. The extra-deep drawing IF steel is characterized that the chemical components and the weight percentage content should conform to: C<=0.008%, Si<=0.015%, Mn<=0.15, P<=0.01%, S<=0.005%, Alt>=0.015%, Ti=0.01-0.07%, Nb=0.01-0.02%, and the balance Fe and trace impurities which cannot be detected. In the annealing process, continuous heating is adopted, the heating rate is 4-8 DEG C / min, the intermediate annealing temperature is 700 DEG C to 750 DEG C, the heat-preserving time is 1-50h, and cooling is performed along with a furnace. The second annealing temperature is 700 DEG C to 750 DEG, the heat-preserving time is 1-10h, and cooling is performed along with the furnace to 400 DEG C-450 DEG C, and discharging and air cooling are performed. The IF steel having excellent deep drawing performance can be obtained by the method, an IF steel sample processed by the process has excellent deep drawing performance, the tensile strength is 290-320MPa, the yield strength is 95-145MPa, the elongation is 45-65%, the plastic strain ratio n is not smaller than 0.27, and the plastic strain ratio r is not smaller than 2.0.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to an ultra-deep drawing IF steel and an annealing process. Background technique [0002] IF steel is widely used in all walks of life in the national economy because of its excellent deep drawing performance. The optimization of annealing process is the key to improve the deep drawing properties of IF steel. The traditional annealing process is based on continuous or bell annealing of cold rolled coils, and there are few reports on the secondary annealing process of the annealed steel strip. After the secondary annealing process, the proportion of {111} texture components that are conducive to deep drawing performance increases, and its deep drawing performance is significantly better than that of primary cold-rolled steel strip, which can meet the stamping requirements of automobile and high-end steel users. need. Contents of the invention [0003] The purpose of the present ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D1/26C21D9/48
Inventor 高志国程德富康利明张辉王海明冯岩青
Owner INNER MONGOLIA BAOTOU STEEL UNION
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