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Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate

A hot-rolled steel plate, high-strength and toughness technology, applied in the field of metallurgical manufacturing, can solve the problems of poor shape accuracy and flatness of section steel, high production cost, high energy consumption, etc., and achieve high flatness, low production cost and high strength. Effect

Active Publication Date: 2009-12-16
武汉钢实机电设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the traditional method of producing high-strength and high-toughness section steel are: the shape accuracy and flatness of the section steel are poor, the energy consumption is large, the production cost is high, and the production cycle is long.

Method used

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  • Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate
  • Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate

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Experimental program
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Effect test

Embodiment 1

[0062] When the thickness of the plate is 40mm, the mass percentage of each chemical component is:

[0063] C: 0.13%, Si: 0.25%, Mn: 1.2%, Ni: 1.45%, Cr: 0.4%, Mo: 0.55%, Cu: 0.15%, Nb: 0.012%, V: 0.02%, Ti: 0.015%, When Al: 0.035%, B: 0.00018%, P: 0.012%, S: 0.003%, N: 0.0035% steel plates are used to manufacture high-strength toughness steel, the specific manufacturing method steps are as follows:

[0064] 1) The above-mentioned hot-rolled steel plate is cut to the required size of the formed steel plate, under the clamping of the flat roller and the vertical roller, heated to 1050°C by an induction heater, and then the steel plate is bent into a shaped steel plate by a roll forming unit ;

[0065] 2) Send the section steel into the induction heater and heat it to 950°C for 110 seconds to make it austenitized;

[0066] 3) Water-cooled quenching, the quenching cooling rate is 16°C / S;

[0067] 4) After quenching, the section steel is heated to 650°C by tempering induction h...

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Abstract

The invention relates to a method for manufacturing section steel with high strength and high toughness by using a hot-rolling steel plate. In the method, the hot-rolling steel plate is adopted, cut by a fixed size, heated to 1050DEG C to 1100DEG C by an induction heater under the clamping of a horizontal roller and an upright roller and then bent and manufactured into section steel by using a roller type forming machine set, the section steel is sent into the induction heater, water-cooling quenching is carried out on the section steel after being heated to 930DEG C to 960DEG C within the time of 60 to 150 seconds, the quenching and cooling speed of the section steel is greater than or equal to 8DEG C / S, the section steel after quenching is heated to 630DEG C to 660DEG C by a tempering induction heater to carry out tempering, the tempering time is 80 to 200 seconds, and straightening, flaw detection, surface inspection and sampling inspection are carried out after refining so as to manufacture the section steel with high strength and high toughness. The invention has the characteristics of small internal stress, high strength, high impact toughness, high shape and size precision, good straightness degree and the like. The section steel can be applied to the production of important structural parts, such as the manufacture of components comprising semilunar plates used for the connection of ocean platform racks, crossbeams of heavy-duty transport trucks and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgical manufacture, and in particular relates to a method for manufacturing high-strength and toughness section steel with hot-rolled steel plates. Background technique [0002] The production of high-strength and high-toughness section steel, the traditional method is to use hot-rolled steel plate with high-strength and high-toughness components, process it into the required section steel shape through cold stamping or hot forming, and then obtain the required mechanical properties through quenching and tempering, and then cold straightening Obtain the required straightness of the profiled steel. The disadvantages of the traditional method of producing high-strength and high-toughness section steel are: the shape accuracy and flatness of the section steel are poor, the energy consumption is large, the production cost is high, and the production cycle is long. [0003] The present invention has de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/00C22C38/54B21D37/16C21D1/42C21D1/18C21D11/00
CPCY02P10/25
Inventor 马景怡
Owner 武汉钢实机电设备有限公司
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