Hot-rolled high-strength strip steel and manufacturing method thereof

A manufacturing method and strip steel technology, applied in the direction of improving process efficiency, can solve problems such as low strength, and achieve the effect of reasonable matching of toughness

Inactive Publication Date: 2012-04-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After using the existing 550MPa hot-rolled high-strength steel strip, users think that the strength is low. Therefore, it is necessary to develop a hot-rolled high-strength steel strip with higher strength, and develop a yield strength ReH of 550Mpa, and a tensile strength Rm of 670~ 830MPa, elongation A≥16%, -40°C impact energy AKv≥27J, 180° cold bending test d=2a high-strength, high-toughness hot-rolled strip steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment is a kind of hot-rolled 550MPa grade high-strength and tough strip steel, the mass percentage distribution of its chemical composition of steel plate thickness 10mm wide 1800mm is as follows:

[0026] C: 0.07%, Si: 0.09%, Mn: 1.60%, P: 0.005%, S: 0.002%, Nb: 0.06%, Ti: 0.07%, Al: 0.03%, 0: 0.0011%, N: 0.0032%,

[0027] The rest is Fe and unavoidable impurities.

[0028] The yield strength ReH of the strip steel is 590Mpa, the tensile strength Rm is 690Mpa, the elongation A is 24%, the impact energy AKv at -40°C is 130J, and the 180° cold bending test d=2a.

[0029] Manufacturing method embodiment one

[0030] The embodiment of this hot-rolled high-strength steel strip manufacturing method is the following steps in sequence:

[0031] I converter smelting

[0032] S: 0.002% molten iron into the furnace, 165 tons, the mass percentage of the composition of the pretreated molten iron is: C 4.0% Si 0.26% S 0.002% and the rest is Fe and unavoidable im...

Embodiment 2

[0046] Present embodiment is a kind of hot-rolled 550MPa grade high-strength and tough strip steel, the mass percentage distribution of its chemical composition of steel plate thickness 4mm wide 2000mm is as follows:

[0047] C: 0.09%, Si: 0.10%, Mn: 1.55%, P: 0.008%, S: 0.001%, Nb: 0.03%, Ti: 0.09%, Al: 0.02%, 0: 0.0012%, N: 0.0035%,

[0048] The rest is Fe and unavoidable impurities.

[0049] The yield strength ReH of the steel plate is 600Mpa, the tensile strength Rm is 720Mpa, the elongation A is 23%, the impact energy AKv at -40°C is 70J, and the 180° cold bending test d=2a.

[0050] Manufacturing method embodiment two

[0051] What this hot-rolled high-strength strip steel manufacturing method manufactures is the strip steel of steel plate embodiment two, and present embodiment is following steps in sequence:

[0052] I converter smelting

[0053] S: 0.002% molten iron into the furnace, 160 tons, the mass percentage of the composition of the pretreated molten iron is:...

Embodiment 3

[0066] The present embodiment is a kind of hot-rolled 550MPa grade high-strength and tough strip steel, the mass percentage distribution of its chemical composition of steel plate thickness 16mm wide 1800mm is as follows:

[0067] C: 0.07%, Si: 0.09%, Mn: 1.60%, P: 0.005%, S: 0.001%, Nb: 0.06%, Ti: 0.09%, Al: 0.03%, 0: 0.0011%, N: 0.0033%,

[0068] The rest is Fe and unavoidable impurities.

[0069] The yield strength ReH of the steel plate is 585Mpa, the tensile strength Rm is 692Mpa, the elongation A is 26%, the impact energy AKv at -40°C is 150J, and the 180° cold bending test d=2a.

[0070] Manufacturing method embodiment three

[0071] The embodiment of this hot-rolled high-strength steel strip manufacturing method is the following steps in sequence:

[0072] I converter smelting

[0073] S: 0.002% molten iron into the furnace, 165 tons, the mass percentage of the composition of the pretreated molten iron is: C 4.0% Si 0.30% S 0.002%, the rest is Fe and unavoidable imp...

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Abstract

The invention relates to hot-rolled high-strength strip steel and a manufacturing method thereof. The strip steel comprises the following components: 0.05-0.10% of C, 0-0.30% of Si, 1.0-1.80% of Mn, not more than 0.015% of P, not more than 0.008% of S, 0.01-0.07% of Nb, 0.01-0.12% of Ti, 0.01-0.05% of Al, not more than 0.0012% of O, not more than 0.0035% of N; the ReH is 580-670 MPa; the Rm is 690-750 MPa; A is 19-30%; -40 DEG C AKv is 50-180 J; and 180-degree d = 2a. The manufacturing method comprises the following steps of: I. converter smelting, wherein the molten steel is processed to contain not more than 0.010% of P and not more than 0.020% of S; II. LF refining, wherein the components are adjusted finely; steel tapping when the components of the molten steel meet the requirements; III. continuous casting, wherein whole-course argon blowing is performed to protect the casting; soft reduction technology is employed; the casting temperature is controlled at 1530-1560 DEG C; VI. hot continuous rolling, wherein the finishing temperature is 820-880 DEG C; a laminar flow cooling mode is employed; and a coiling temperature CT is 530-620 DEG C. The hot-rolled high-strength strip steel manufactured by the invention meets the requirements of steel for engineering machinery.

Description

technical field [0001] A hot-rolled high-strength steel strip and a manufacturing method thereof, specifically a 550MPa grade hot-rolled high-strength steel strip and a manufacturing method thereof Background technique [0002] After using the existing 550MPa hot-rolled high-strength steel strip, users think that the strength is low. Therefore, it is necessary to develop a hot-rolled high-strength steel strip with higher strength, and develop a yield strength ReH of 550Mpa and a tensile strength Rm of 670~ 830MPa, elongation A≥16%, -40°C impact energy AKv≥27J, 180° cold bending test d=2a high-strength, high-toughness hot-rolled strip steel. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing 550MPa grade hot-rolled high-strength strip steel, the present invention provides a hot-rolled high-strength strip steel, the hot-rolled strip steel yield strength ReH≥550MPa, tensile strength Rm670~830MPa, elongation A≥16% , -40 ℃ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
CPCY02P10/20
Inventor 孟传峰王育田付培茂
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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