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Interstitial free (IF) hot rolled strip and manufacturing method thereof

A technology with no interstitial atoms and manufacturing methods, applied in the manufacture of converters, etc., can solve the problems of uneven microstructure, poor plasticity, and low deep drawing performance of cold-rolled steel strips, etc.

Active Publication Date: 2009-12-23
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to achieve the above purpose, and to solve the problem of poor deep drawing performance of the finished cold-rolled steel strip due to uneven microstructure and poor plasticity of the hot-rolled steel strip, the present invention mainly produces a Good Plasticity Nb, Ti Composite Microalloyed IF Hot Rolled Steel Strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The thickness of the interstitial-free hot-rolled steel strip of the present embodiment is 3.0 mm, and the mass percentage ratio of the chemical composition is:

[0047] C: 0.0016 N: 0.0020 Si: 0.01 Mn: 0.14 P: 0.007

[0048] S: 0.005 Al: 0.04 Ti: 0.05 Nb: 0.015 Cr: 0.02

[0049] Ni: 0.02 Cu: 0.01 Mo: 0.002, and the rest are Fe and unavoidable impurities.

[0050] The IF hot-rolled steel strip of the present embodiment is sampled according to the GB / T 2975 standard, and the tensile properties are tested according to the GB / T 228 standard. The test results: lower yield strength ReL: 245MPa, tensile strength Rm: 320MPa, elongation after fracture A : 48%. The hot-rolled steel strip in this embodiment is sampled according to the GB / T 2975 standard, and the cold-bending performance is tested according to the GB / T 232 standard. The test result shows that the 180°d=0 cold-bending sample is intact.

Embodiment 2

[0052] The mass percentage ratio of the chemical composition of the interstitial-free hot-rolled steel strip with a thickness of 4.0 mm is:

[0053] C: 0.0015 N: 0.0018 Si: 0.01 Mn: 0.141 P: 0.007

[0054] S: 0.005 AL: 0.04 Ti: 0.05 Nb: 0.014 Cr: 0.02

[0055] Ni: 0.02 Cu: 0.01 Mo: 0.0043, and the rest are Fe and unavoidable impurities.

[0056] The IF hot-rolled steel strip of the present embodiment is sampled according to the GB / T 2975 standard, and the tensile properties are tested according to the GB / T 228 standard. The test results: lower yield strength ReL: 260MPa, tensile strength Rm: 315MPa, elongation after fracture A : 50%. The above-mentioned IF hot-rolled steel strip is sampled according to GB / T 2975 standard, and the cold-bending performance is tested according to GB / T 232 standard. The test result shows that the 180°d=0 cold-bending sample is intact.

Embodiment 3

[0058] The mass percentage ratio of the chemical composition of the interstitial-free hot-rolled steel strip with a thickness of 5.0 mm is:

[0059] C: 0.0014 N: 0.0015 Si: 0.006 Mn: 0.147 P: 0.0061

[0060] S: 0.005 AL: 0.0383 Ti: 0.056 Nb: 0.0146; Cr: 0.0163;

[0061] Ni: 0.0137 Cu: 0.0055 Mo: 0.0024, and the rest are Fe and unavoidable impurities.

[0062] The IF hot-rolled steel strip of the present embodiment is sampled according to the GB / T 2975 standard, and the tensile properties are tested according to the GB / T 228 standard. The test results: the lower yield strength ReL: 215MPa, the tensile strength Rm: 295MPa, and the elongation after fracture A : 52%. The above-mentioned IF hot-rolled steel strip is sampled according to GB / T 2975 standard, and the cold-bending performance is tested according to GB / T 232 standard. The test result shows that the 180°d=0 cold-bending sample is intact.

[0063] Manufacturing method embodiment one

[0064] What the present embodimen...

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Abstract

The invention provides an interstitial free hot rolled strip and a manufacturing method thereof. The mass percents of the chemical constituents of the strip are as follows: 0<C<=0.005, 0<P<=0.018, 0<S<=0.015, 0<N<=0.004, 0<Si<=0.03, Mn 0. 10-0.20, Al 0.02-0.06, 0<Ti<=0.070, 0<Nb<=0.020, 0<Cr<=0.05, 0<Ni<=0.07, 0<Cu<=0.07, 0<Mo<=0.020 and the balance of Fe and other inevitable impurities. The manufacturing method comprises the steps of preparing continuous castings according to the constituent requirement and processing the continuous castings into the hot rolled strip. The manufacturing method of the strip comprises the following steps: A. preparing continuous castings to be desulfurized by liquid iron pretreatment, smelted in a top-bottom combined blowing converter, RH refined and continuously cast by heavy slabs; B. adopting the traditional hot continuous rolling process to process the continuous castings into the hot rolled strip; the finishing temperature is 880-930 DEG C; the hot rolled strip is quickly water-cooled to the temperature of 680-750 DEG C to be reeled up and then is cooled to the room temperature. The strip manufactured by the method has low strength, high plasticity and good processing technic.

Description

technical field [0001] The invention relates to a hot-rolled steel strip without interstitial atoms and a manufacturing method thereof. Background technique [0002] The automobile industry has always been the pillar industry of the economy in developed countries, and it is also an important industry in some developing countries. Since 2001, with the rapid development of my country's automobile industry, the demand for automobile steel has increased significantly. At present, the steel used in automobiles is still dominated by steel plates, of which the weight of steel plates for cars accounts for about 50% of the total weight of cars. Most of the steel plates used in car parts, such as steel plates for hoods, trunk lids, door panels, front and rear fenders, roof panels, underbody panels, and instrument panels, need to be stamped and formed, and in order to simplify the assembly of the car body, further To improve the overall performance and safety performance of cars, car...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21C1/02C21C5/28C21C7/10B22D11/16C21D1/34C21D8/02
Inventor 辛建卿王立新
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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