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Q590-grade hot-rolled steel band with high strength and toughness, and preparation method thereof

A high-strength and toughness, steel strip technology, applied in the field of metallurgy, can solve the problems of not easy to control the shape and thickness fluctuations of the head and tail, increase the electric energy of hot rolling, roll consumption, high smelting production cost, and achieve easy control of process and performance, production Effects of cost reduction and reduction in hot rolling force

Inactive Publication Date: 2018-04-17
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The high-strength and toughness hot-rolled steel strip with a yield strength of 590 is mainly used in the construction industry and the truck manufacturing industry. At present, this kind of steel strip produced at home and abroad adopts the strategy of adding microalloying elements such as Nb and Ti, and the smelting and production costs are high. , and the hot rolling force is high, it is not easy to control the fluctuation of the plate shape and the thickness of the head and tail, and at the same time increase the electric energy and roll consumption during hot rolling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The thickness of the Q590-grade high-strength and toughness hot-rolled steel strip in this example is 3.5mm, and its chemical composition and mass percentage are: C: 0.06%, Mn: 1.51%, Al: 0.07%, Si: 0.30%, S: 0.009 %, P: 0.011%, N: 0.010%, V: 0.07%, Cr: 0.31%, the rest is iron and unavoidable impurities.

[0016] The production method of the Q590-grade high-strength and toughness hot-rolled steel strip in this embodiment includes heating, rolling, layer cooling and coiling processes. The specific process steps are as follows:

[0017] (1) Heating process: billet heating temperature is 1130℃;

[0018] (2) Rolling process: the hot coil box adopts the straight-through mode, the thickness of the intermediate billet is 40mm, and the final rolling temperature is 855℃;

[0019] (3) Layer cooling process: Layer cooling performs front-stage cooling;

[0020] (4) Curl process: Coiling temperature is 550℃.

[0021] The performance test results of the Q590-grade high-strength and toughness h...

Embodiment 2

[0023] The thickness of the Q590 grade high-strength and toughness hot-rolled steel strip in this example is 6.0mm, and its chemical composition and mass percentage are: C: 0.10%, Mn: 1.72%, Al: 0.07%, Si: 0.29%, S: 0.008 %, P: 0.010%, N: 0.012%, V: 0.09%, Cr: 0.27%, the rest is iron and unavoidable impurities.

[0024] The production method of the Q590-grade high-strength and toughness hot-rolled steel strip in this embodiment includes heating, rolling, layer cooling and coiling processes. The specific process steps are as follows:

[0025] (1) Heating process: billet heating temperature is 1180℃;

[0026] (2) Rolling process: the hot coil box adopts the straight-through mode, the thickness of the intermediate billet is 40mm, and the final rolling temperature is 840℃;

[0027] (3) Layer cooling process: Layer cooling performs front-stage cooling;

[0028] (4) Curl process: The coiling temperature is 540°C.

[0029] The performance test results of the Q590-grade high-strength and toughn...

Embodiment 3

[0031] The thickness of the Q590 grade high-toughness hot-rolled steel strip in this example is 10.0mm, and its chemical composition and mass percentage are: C: 0.11%, Mn: 1.75%, Al: 0.10%, Si: 0.39%, S: 0.010 %, P: 0.011%, N: 0.014%, V: 0.10%, Cr: 0.33%, the rest is iron and unavoidable impurities.

[0032] The production method of the Q590-grade high-strength and toughness hot-rolled steel strip in this embodiment includes heating, rolling, layer cooling and coiling processes. The specific process steps are as follows:

[0033] (1) Heating process: billet heating temperature is 1155℃;

[0034] (2) Rolling process: the hot coil box adopts the straight-through mode, the thickness of the intermediate billet is 45mm, and the final rolling temperature is 820℃;

[0035] (3) Layer cooling process: Layer cooling performs front-stage cooling;

[0036] (4) Curl process: The coiling temperature is 520℃.

[0037] The performance test results of the Q590-grade high-strength and toughness hot-rolle...

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Abstract

The invention discloses a Q590-grade hot-rolled steel band with high strength and toughness, and a preparation method thereof. The steel band is prepared from the chemical components in percentage bymass: 0.06 to 0.12 percent of C, 1.3 to 2.0 percent of Mn, 0.01 to 0.1 percent of Al, 0.2 to 0.5 percent of Si, less than or equal to 0.01 percent of S, less than or equal to 0.012 percent of P, 0.06to 0.13 percent of V, 0.009 to 0.017 percent of N, 0.2 to 0.4 percent of Cr, and the balance iron and inevitable impurities. The preparation method comprises the process of heating, rolling, layer cooling and coiling. According to the Q590-grade hot-rolled steel band with high strength and toughness, and the preparation method thereof provided by the invention, a relatively simple and low component system and a special hot rolling process are adopted for controlling steel band grain sizes and a metallographic structure of the hot-rolled steel band so as to control strip performances, the yieldstrength is larger than or equal to 590MPa, the tensile strength is larger than or equal to 680MPa, the impact property is larger than or equal to 25J, the specific elongation A50 is larger than or equal to 22 percent, the performances are excellent, and the production cost is low.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a Q590-grade high-strength and toughness hot-rolled steel strip and a preparation method thereof. Background technique [0002] The yield strength is 590 grade high-strength and toughness hot-rolled steel strip, which is mainly used in the construction industry and truck manufacturing industry. At present, this kind of steel strip produced at home and abroad adopts the strategy of adding Nb, Ti and other microalloying elements, and the smelting production cost is high. , And the hot rolling force is relatively high, it is not easy to control the plate shape and head and tail thickness fluctuations, and at the same time increase the electric energy and roll consumption during hot rolling. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a Q590-grade high-strength and toughness hot-rolled steel strip and a preparati...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/02C22C38/38C22C38/24C21D8/02
Inventor 安会龙杨丽芳孙力杨浩赵燕青刘毅魏焕君陈振业梁媛媛刘需
Owner HEBEI IRON AND STEEL