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Alloy steel for high-strength plate and preparation method thereof

An alloy steel, high-strength technology, applied in the field of alloy steel, can solve problems such as unified standards

Inactive Publication Date: 2017-01-04
启东市海纳特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many patents have been formed on the manufacturing method of hot-rolled high-strength steel sheets in the world, but they mainly focus on low-alloy high-strength steel (HSLA), dual-phase steel (DP) and transformation-induced plasticity steel (TRIP). 1000MPa hot-rolled ultra-high-strength steel plate (thickness 1.5mm ~ 6mm), has not yet unified standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-strength plate alloy steel whose basic composition is the following mass percentage: C: 0.30Mn: 0.5 Si: 0.9 Al: 0.01 Cr 2.0, Nb 0.08 Ag0.02 Cu 1.5 W 0.01, P: ≤0.02 S: < 0.012 and the rest are Fe and unavoidable impurities.

[0035] A preparation method of alloy steel high-strength plate, said preparation method comprising the following steps:

[0036] 1) Refining and casting the joint venture;

[0037] 2) Billet reheating: the heating temperature is 1200℃~1210℃;

[0038] 3) Rolling: Pre-rolling hot deformation in the temperature range where austenite recrystallization occurs, and in the temperature range lower than austenite recrystallization but higher than the Ar3 transformation point, use 3 passes for final rolling ;Finish rolling temperature is 900-950℃;

[0039] 4) Cooling: In the first stage, cool to 500°C at a cooling rate of 15°C / s; in the second stage, cool to 200°C at a cooling rate of 40°C / s.

[0040]The tensile strength of the hot-rolled steel pla...

Embodiment 2

[0042] An alloy steel for high-strength plates whose basic composition is the following mass percentage: C: 0.38Mn: 0.8 Si: 1 Al: 0.6 Cr 2.2, Nb 0.1 Ag 0.06 Cu1.6 W 0.02, P: ≤0.02 S: < 0.012 and the rest are Fe and unavoidable impurities.

[0043] A preparation method of alloy steel high-strength plates, said preparation method comprising the following steps:

[0044] 1) Refining and casting the joint venture;

[0045] 2) Billet reheating: the heating temperature is 1200℃~1210℃;

[0046] 3) Rolling: Pre-rolling hot deformation in the temperature range where austenite recrystallization occurs, and in the temperature range lower than austenite recrystallization but higher than the Ar3 transformation point, use 3 passes for final rolling ;Finish rolling temperature is 900-950℃;

[0047] 4) Cooling: In the first stage, cool to 500°C at a cooling rate of 15°C / s; in the second stage, cool to 200°C at a cooling rate of 40°C / s.

[0048] The tensile strength of the hot-rolled steel...

Embodiment 3

[0050] An alloy steel for high-strength plates whose basic composition is the following mass percentage: C: 0.32Mn: 0.6 Si: 0.95 Al: 0.05 Cr 2.1, Nb 0.09 Ag0.04 Cu 1.5 W 0.015, P: ≤0.02 S: < 0.012 and the rest are Fe and unavoidable impurities.

[0051] A preparation method of alloy steel high-strength plates, said preparation method comprising the following steps:

[0052] 1) Refining and casting the joint venture;

[0053] 2) Billet reheating: the heating temperature is 1200℃~1210℃;

[0054] 3) Rolling: Pre-rolling hot deformation in the temperature range where austenite recrystallization occurs, and in the temperature range lower than austenite recrystallization but higher than the Ar3 transformation point, use 3 passes for final rolling ;Finish rolling temperature is 900-950℃;

[0055] 4) Cooling: In the first stage, cool to 500°C at a cooling rate of 15°C / s; in the second stage, cool to 200°C at a cooling rate of 40°C / s.

[0056] The tensile strength of the hot-rolled...

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Abstract

The invention discloses an alloy steel for high-strength plates, the basic composition of which is the following components by mass percentage: C: 0.30-0.38 Mn: 0.5-0.8 Si: 0.9-1 Al: 0.01-0.6 Cr2.0-2.2, Nb0. 08~0.1 Ag0.02~0.06 Cu1.5~1.6 W0.01~0.02, P: ≤0.02S: <0.012 The rest are Fe and unavoidable impurities. The preparation method includes the following steps: refining and casting the alloy; reheating the billet: the heating temperature is 1200°C to 1210°C; In the temperature range where austenite recrystallization occurs but is higher than the Ar3 transformation point, 3 passes are used for finish rolling; the finish rolling temperature is 900-950°C; through reasonable and cheap alloy composition design and segmental cooling process after rolling The tensile strength of the hot-rolled steel plate is greater than or equal to 1200MPa, the yield strength is greater than or equal to 550MPa, the yield ratio is low, and the elongation A80 (JIS13A gauge length 80mm sample) is greater than or equal to 13%.

Description

technical field [0001] The invention relates to an alloy steel, in particular to an alloy steel for high-strength plates and a preparation method thereof. Background technique [0002] With the development of the automobile industry, the requirements for vehicle safety are getting higher and higher. At the same time, the shortage of energy and the demand for environmental protection also require vehicles to reduce their own weight to reduce fuel consumption. Therefore, the strength requirements for steel plates used in vehicles are constantly increasing. The performance requirements of the part steel plate are also more and more detailed, and advanced high-strength steel (AHSS) or ultra-high-strength steel (Ultra-HSS) emerges as the times require. Generally, steels with a tensile strength greater than 700MPa can be classified as ultra-high-strength steels. Ultra-high strength has very high tensile strength and high deformation absorption energy, suitable for manufacturing s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/26C21D8/02
Inventor 华玉叶
Owner 启东市海纳特钢有限公司