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

A high-strength, high-toughness technology, applied in the field of hot-rolled coils to manufacture high-strength and high-toughness steel plates, can solve the problems of tough steel plates that cannot be produced, thin gauge, high strength, and low product quality, achieving short heating time and occupying an area The effect of small area and low equipment investment

Active Publication Date: 2009-12-16
武汉武钢实业机电材料工程有限公司
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Problems solved by technology

The production of such products by traditional technology has complicated procedures, high energy consumption, low yield, low product quality, and thin-gauge, high-strength and high-toughness steel plates cannot be produced

Method used

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

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Embodiment

[0064] The mass percentage of each chemical element is: C: 0.17%, Si: 0.25%, Mn: 1.25%, Ni: 0.05%, Cr: 0.21%, Mo: 0.61%, Cu: 0.01%, Nb: 0.015%, V: 0.038%, Ti: 0.025%, Al: 0.035%, B: 0.0015%, P: 0.018%, S: 0.004%, N: 0.0035%, and the rest are made of iron 12mm thick hot-rolled coils. Yield strength Reh≥1030MPa high For high-strength and high-toughness steel plates, the heat treatment process is as follows: heating to 940°C in induction heating equipment for austenitization, heating time is 100s, quenching cooling rate is 20°C / s, heating to 290°C in induction heating equipment for back Fire, tempering time 120s. A high-strength and high-toughness steel plate with mechanical properties of: Reh: 1080MPa, Rm: 1280MPa, A%: 13%, Akv-40°C: 98J was obtained.

[0065] figure 2 It shows the CCT curve of steel whose Reh is 1030MPa drawn by using Formastor-F thermal dilatometer combined with observation of metallographic structure and hardness test. When the cooling rate is 20°C / s, the...

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Abstract

The invention relates to a manufacture method for manufacturing a steel plate with high strength and high toughness by using a hot-rolling coiled plate. The method comprises the following steps that: firstly, after a hot-rolling coiled plate is leveled on a leveling machine set, refining heat treatment is carried out on the hot-rolling coiled plate, i.e. the hot-rolling coiled plate is heated in induction heating equipment, the heating time is within 60-140s, and the hot-rolling coiled plate is heated to 910DEG C to 960DEG C and austenized; then, the hot-rolling coiled plate enters a water-cooling or steam-cooling quenching machine set to carry out quenching, the quenching and cooling speed of the hot-rolling coiled plate is greater than or equal to 5DEG C / s, and a quenched martensite organization is obtained after quenching; tempering is carried out after quenching, induction heating is carried out by adopting the induction heating equipment in the tempering, the heating temperature of the quenched martensite organization is 220DEG C to 440DEG C, the tempering time is 80 to 180s, and a tempered martensite organization is obtained; and finally, straightening, flaw detection, surface inspection and sampling inspection are carried out to finally obtain the steel plate with excellent performance, high strength and high toughness. The invention has the advantages that as refining treatment adopts an induction heating method, the heating time is short, austenite crystal grains are fine, the mechanical property is superior to that of a similar product produced by the traditional technology, the plate type of the steel plate is good, and the invention has high production efficiency, low equipment investment, little maintenance cost of the equipment, small occupation area and little environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metallurgical manufacturing mechanical structural parts, in particular to a method for manufacturing high-strength and high-toughness steel plates by using hot-rolled coils. Background technique [0002] High-strength and high-toughness steel plate is an important raw material for the production of equipment manufacturing industry. It can be used in the manufacture of important structural parts such as heavy trucks, automobile booms, and loaders. [0003] The traditional manufacturing method of high-strength and high-toughness steel plate is to use continuous casting billet, roll it into the original flat plate in the medium and heavy plate rolling mill, cut off the four sides, austenitize the steel plate through a heat treatment furnace, and then quench it in the quenching unit to obtain quenched The martensite is heated to the tempering heat temperature in a tempering heat treatment fu...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/54C21D1/42C21D1/18
CPCY02P10/25
Inventor 马景怡
Owner 武汉武钢实业机电材料工程有限公司
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