IF steel containing niobium and titanium for advanced automobile and annealing process

An automobile and advanced technology, applied in the field of metallurgy, can solve the problems of poor production flexibility, complex annealing process and high production cost, and achieve the effects of high production efficiency, low construction investment and low production cost

Inactive Publication Date: 2012-06-27
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with application number 200710012550.5 discloses a bell-type annealing process for IF steel. Although this patent can formulate a staged annealing process to obtain an IF steel strip with excellent deep-drawing performance, the annealing cycle is too long and the annealing process is complicated. , poor production flexibility and high production costs

Method used

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  • IF steel containing niobium and titanium for advanced automobile and annealing process
  • IF steel containing niobium and titanium for advanced automobile and annealing process
  • IF steel containing niobium and titanium for advanced automobile and annealing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put the slab to be rolled into the heating furnace. The chemical composition and weight percentage of the slab are: C 0.006%, Si 0.005%, Mn 0.14%, P 0.017%, S 0.004%, Alt 0.03%, Ti 0.012 %, Nb 0.023%, the rest is Fe and undetectable trace impurities.

[0013] The heating rate is 6°C / min, the annealing temperature is 700°C, the holding time is 2 hours, and then the furnace is cooled to 450°C and air-cooled. The mechanical properties of the IF steel samples treated according to the above process are shown in Table 1, Table 2, and Table 3. The heating curve and sample texture are as follows: figure 1 , figure 2 shown. The {111} texture is dominant in the sample.

[0014] Table 1 Longitudinal mechanical properties and n, r value properties

[0015]

R P0.2 / MPa

Rm / MPa

R P0.2 / Rm

A％

n

r

126

310

0.41

42

0.26

1.95

147

310

0.47

44

0.268 ...

Embodiment 2

[0021] Put the slab to be rolled into the heating furnace. The chemical composition and weight percentage of the slab are: C 0.006%, Si 0.004%, Mn 0.147%, P 0.011%, S 0.004%, Alt 0.031%, Ti 0.013 %, Nb 0.018%, the rest is Fe and undetectable trace impurities.

[0022] The heating rate is 6°C / min, the annealing temperature is 720°C, the holding time is 2 hours, and then it is cooled to 400°C with the furnace and air-cooled. The test values ​​of the mechanical properties of the IF steel samples treated according to the above process are shown in Tables 4, 5, and 6. The heating curve and sample texture are as follows: image 3 , Figure 4 shown. The {111} texture is dominant in the sample.

[0023] Table 4 Longitudinal mechanical properties and n, r value properties

[0024] R P0.2 / MPa

Rm / MPa

R P0.2 / Rm

A％

n

r

137

325

0.42

49.5

0.25

2.12

137

325

0.42

49

0.25

2...

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Abstract

The invention relates to IF steel containing niobium and titanium for an advanced automobile and an annealing process, which belong to the technical field of metallurgy. The IF steel containing the niobium and the titanium for the advanced automobile and the annealing process are characterized in that continuous heating is adopted in the annealing procedure, the heating rate is 4 to 8 DEG C / minute, the annealing temperature is 700 to 750 DEG C, the heat-preservation time is 1 to 10 hours, and the material is cooled to 400 to 450 DEG C along with a furnace and is taken out of the furnace for air cooling. By the mode, IF steel with excellent deep drawability can be obtained; a test sample of the IF steel after being processed by the process has excellent deep drawability; in a longitudinal direction, the tensile strength reaches 290 to 330MPa, the yield strength is 125 to 155MPa, and the elongation rate is 40 to 55 percent; in a transverse direction, the tensile strength reaches 310 to 340MPa, the yield strength is 120 to 190MPa, and the elongation rate is 40 to 55 percent; and the plane anisotropy delta r of the strain hardening index is not greater than 0.25.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to an IF steel containing niobium and titanium for advanced automobiles and an annealing process. Background technique [0002] In IF steel (also known as ultra-low carbon steel), due to the low content of C and N, a certain amount of titanium (Ti), niobium (Nb) and other strong carbon-nitrogen compound forming elements are added to reduce the carbon, The interstitial atoms such as nitrogen are completely fixed as carbon-nitrogen compounds, so as to obtain interstitial atom-free clean ferritic steel with excellent deep drawing performance, and its elongation and r value can reach 50% and above 2.0, and it is widely used in the automobile industry . In order to improve the deep drawing performance of IF steel, it is necessary to formulate a suitable annealing process. The Chinese invention patent with application number 200710012550.5 discloses a bell-type annealing process for IF ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D1/26C21D9/52
Inventor 高志国冯岩青张小燕温利军施小霞
Owner INNER MONGOLIA BAOTOU STEEL UNION
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