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Niobium micro-alloying gap-free hot rolled strip and manufacture method thereof

A technology of interstitial atoms and micro-alloying, applied in the manufacture of converters, etc., can solve problems such as uneven structure of hot-rolled steel strips, low deep-drawing properties of cold-rolled steel strips, and poor plasticity

Active Publication Date: 2011-04-27
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to achieve the above purpose, and 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 ductility niobium microalloyed IF hot rolled steel strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The thickness of the niobium microalloyed interstitial-free hot-rolled steel strip of this embodiment is 3.0mm, and the mass percentage ratio of the chemical composition is:

[0048] C: 0.0015 N: 0.0019 Si: 0.009 Mn: 0.13 P: 0.006

[0049] S: 0.004 Al: 0.05 Nb: 0.016 Cr: 0.01 Ni: 0.01

[0050] Cu: 0.01 Mo: 0.001, and the rest are Fe and unavoidable impurities.

[0051] The niobium microalloyed IF hot-rolled steel strip of this 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: 225MPa, the tensile strength Rm: 310MPa, after breaking Elongation A: 48.5%. 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

[0053] The thickness of the niobium microalloyed interstitial-free hot-rolled steel strip of this embodiment is 4.0 mm, and the mass percentage ratio of the chemical composition is:

[0054] C: 0.0013 N: 0.0018 Si: 0.01 Mn: 0.145 P: 0.007

[0055] S: 0.0035 Al: 0.043 Nb: 0.014 Cr: 0.01 Ni: 0.01

[0056] Cu: 0.01 Mo: 0.0023, and the rest are Fe and unavoidable impurities.

[0057] The niobium microalloyed IF hot-rolled steel strip of this 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 are: lower yield strength ReL: 210MPa, tensile strength Rm: 300MPa, after fracture Elongation A: 51.5%. The above-mentioned IF hot-rolled steel strip is sampled according to GB / T2975 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

[0059] The mass percentage ratio of the chemical composition of the interstitial-free hot-rolled steel strip with a thickness of 5.0 mm is:

[0060] C: 0.0012 N: 0.0015 Si: 0.005 Mn: 0.149 P: 0.0063

[0061] S: 0.0045 Al: 0.051 Nb: 0.0146 Cr: 0.015 Ni: 0.013

[0062] Cu: 0.01 Mo: 0.0022, and the rest are Fe and unavoidable impurities.

[0063] The niobium microalloyed IF hot-rolled steel strip of this 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: 185MPa, the tensile strength Rm: 290MPa, after breaking Elongation A: 55.5%. The above-mentioned IF hot-rolled steel strip is sampled according to GB / T2975 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.

[0064] Manufacturing method embodiment one

[0065] What the present embodiment manufact...

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Abstract

The invention relates to a niobium micro-alloying gap-free hot rolled strip and a manufacture method thereof. The strip comprises the chemical components by weight percent: more than 0 and no more than 0.005 percent of C, more than 0 and no more than 0.018 percent of P, more than 0 and no more than 0.015 percent of S, more than 0 and no more than 0.004 percent of N, more than 0 and no more than 0.03 percent of Si, 0.01 to 0.20 percent of Mn, 0.02 to 0.06 percent of Al, more than 0 and no more than 0.020 percent of Nb, more than 0 and no more than 0.05 percent of Cr, more than 0 and no more than 0.07 percent of Ni, more than 0 and no more than 0.07 percent of Cu, more than 0 and no more than 0.020 percent of Mo, and the balance of Fe and inevitable impurities. The manufacture method of thestrip comprises the following steps: A. preparing a continuous casting billet: preprocessing and desulfurizing by molten iron, smelting by a top-bottom combined blowing converter, RH refining and continuously casting heavy slabs; and B. adopting the traditional hot continuous rolling process to process the continuous casting billet into the hot rolled strip with the final rolling temperature of 880 DEG C to 930 DEG C, carrying out fast water cooling to 680 DEG C to 750 DEG C, coiling, and then cooling to the room temperature. The strip manufactured by the manufacture method of the niobium micro-alloying gap-free hot rolled strip has low strength, high plasticity and favorable processing technology.

Description

technical field [0001] The invention relates to a niobium microalloyed 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 per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C21D8/02C21C1/02C21C5/30C21C7/10
Inventor 辛建卿王立新
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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