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6-8mm high-strength structural steel plate and manufacture method thereof

A technology of structural steel plate and manufacturing method, which is applied in the field of steel plate manufacturing, can solve problems such as inability to meet demand, achieve the effect of improving plasticity and toughness index, achieving remarkable implementation effect, and eliminating internal stress in organization

Inactive Publication Date: 2013-12-18
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, only Q345B and Q460C steel grades that meet the national standards, and the flatness index of 6mm / m can be used, which is far from meeting the demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Slab smelting composition is:

[0019] Carbon 0.13%, silicon 0.25%, manganese 1.20%, copper 0.36%, phosphorus 0.013%, sulfur 0.002%, boron 0.0011%, molybdenum 0.10%, aluminum 0.030%, the balance is iron and inevitable impurities.

[0020] The manufacturing process steps are as follows:

[0021] (1) LF refining outside the furnace: the heating time is 15 minutes, the white slag is desulfurized, and the titanium content is adjusted by adding a trace alloy; finally, the ferroboron alloy is added;

[0022] (2) CD / RH vacuum degassing: under vacuum 200Pa for 20 minutes, and argon soft blowing for 10 minutes after feeding the wire;

[0023] (3) Slab heating: soaking temperature range 1120 ℃, soaking time range 3.2 hours. By using finely dispersed TiN particles and low-temperature heating to suppress the growth of austenite grains, fine and uniform austenite grains are obtained.

[0024] (4) Rough rolling: the rolling temperature is 1120℃, and the single-pass reduction rate ...

Embodiment 2

[0031] Slab smelting composition is:

[0032] Carbon 0.20%, silicon 0.15%, manganese 1.50%, copper 0.50%, phosphorus 0.015%, sulfur 0.012%, boron 0.0021%, molybdenum 0.20%, aluminum 0.040%, the balance is iron and inevitable impurities.

[0033] The manufacturing process steps are as follows:

[0034] (1) LF refining outside the furnace: the heating time is 12 minutes, the white slag is desulfurized, and the titanium content is adjusted by adding a trace alloy; finally, the ferroboron alloy is added;

[0035] (2) CD / RH vacuum degassing: under vacuum 200Pa for 20 minutes, and argon soft blowing for 10 minutes after feeding the wire;

[0036] (3) Slab heating: soaking temperature range 1150 ℃, soaking time range 2.7 hours. By using finely dispersed TiN particles and low-temperature heating to suppress the growth of austenite grains, fine and uniform austenite grains are obtained.

[0037] (4) Rough rolling: the rolling temperature is 1100℃, and the single-pass reduction rate ...

Embodiment 3

[0044] Slab smelting composition is:

[0045] Carbon 0.10%, silicon 0.35%, manganese 0.80%, copper 0.40%, phosphorus 0.010%, sulfur 0.008%, boron 0.0005%, molybdenum 0.40%, the balance is iron and inevitable impurities.

[0046] The manufacturing process steps are as follows:

[0047] (1) LF refining outside the furnace: the heating time is 20 minutes, the white slag is desulfurized, and the titanium content is adjusted by adding a trace alloy; finally, the ferroboron alloy is added;

[0048] (2) CD / RH vacuum degassing: under vacuum 200Pa for 20 minutes, and argon soft blowing for 10 minutes after feeding the wire;

[0049] (3) Slab heating: soaking temperature range is 1100℃, soaking time range is 4 hours. By using finely dispersed TiN particles and low-temperature heating to suppress the growth of austenite grains, fine and uniform austenite grains are obtained.

[0050] (4) Rough rolling: the rolling temperature is 1050℃, and the single-pass reduction rate is greater tha...

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Abstract

The invention provides a 6-8mm high-strength structural steel plate and a manufacture method thereof, aiming at meeting the market requirement for the technology of utilizing thinner steel plates for a concrete pump truck, an aerial ladder and a special vehicle for high-level rescue, and overcoming the shortcomings in the aspect ofdue to the strength, service life and the likeothers of low-level steel. The manufacture method is characterized in that low carbon and manganese contents are is designed; 0.0012% of boron and 0.08% of molybdenum element are added; a converter is utilized for realizing quick smelting; the external refining and degassing refining are performed to improve the purity of molten steel; and rolling, quenching and tempering technologies are carried out to improve the strength and toughness of the steel as well as improve the straightness of the steel plate, in order to obtain a tempered sorbite metallographic structure. The method is short in process, high in efficiency, easy to operate and weld, and low in cost; and the shape and straightness of the plate are controlled to meet the requirements on manufacturing and using of modern pump trucks, high-level aerial ladders, rescue work facilities and other telescopic arm structures.

Description

technical field [0001] The invention relates to the technical field of steel plate manufacturing methods, in particular to a process technology for improving the strength, toughness and shape control of 6-8mm ultra-thin high-strength structural steel plates. It is a design of an alloy containing molybdenum and boron. The invention discloses a method for improving the strength and toughness of steel by fire technology, specifically a 6-8mm high-strength structural steel plate and a manufacturing method thereof. Background technique [0002] The extension arms of cement pump trucks, fire ladders and high-rise rescue special vehicles use high-strength steel with a yield strength exceeding 770MPa. The manufacturing process and the use process require the telescopic arms to be straight and free of contact friction. In order to lift higher and lift more objects, To ensure the rigidity of the structure stability, high strength and light weight, and reduce the thickness of the steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/20C22C33/04C21D8/02
Inventor 冯勇孙卫华刘晓东孙风晓周兰聚韩启彪王南辉贾慧领胡淑娥侯东华王杰许方泉姜广林周波彭新华
Owner JIGANG GRP
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