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

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 traditionaltechnology, 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...

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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

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