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Wire rod and steel wire with excellent toughness and method for producing the same

A manufacturing method and technology of wire rods, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of not wide temperature range, limitation of rapid grain growth inhibition effect, etc., and achieve the effect of excellent toughness

Active Publication Date: 2020-05-26
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of rolling in the non-recrystallized region, rolling is performed at a temperature just above Ar3, so the temperature range is not wide, and when cooling after finishing rolling, grains based on accumulated deformation and transformation heat, etc. Rapid growth inhibitory effect is limited

Method used

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  • Wire rod and steel wire with excellent toughness and method for producing the same
  • Wire rod and steel wire with excellent toughness and method for producing the same
  • Wire rod and steel wire with excellent toughness and method for producing the same

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Embodiment Construction

[0044] The present invention will be described below.

[0045] When QT-heat-treating steel, minimization of the initial austenite grain size and short heating times prior to QT-heat-treatment are particularly important in order to ensure a fine AGS (austenite grain size).

[0046] The purpose of the present invention is to achieve the refinement of initial austenite grains before QT heat treatment.

[0047] For this reason, as far as wire rods and steel wires are concerned, steel composition, microstructure and precipitates should be controlled.

[0048] 1) In terms of microstructure, by including ferrite and pearlite, and increasing the subgrain fraction in ferrite, austenite nuclei can also be generated in ferrite grains, Thus, the refinement of initial austenite grains can be achieved.

[0049] 2) In terms of precipitates, carbon / nitrogen precipitates are formed by adding carbon / nitride forming elements such as Al, Ti, Nb, V, Mo, etc., so that during QT heat treatment, in...

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Abstract

The invention relates to a steel wire rod and steel wire having high toughness and a method for manufacturing thereof, wherein the steel wire rod and steel wire includes, by weight, 0.1-0.6% of carbon, 0.1-2.0% of silicon, 0.1-1.0% of chromium, 0.2-2.0% of manganese, 0.01-0.05% of aluminum, and 0.004-0.02% of nitrogen, the balanced being iron and other unavoidable impurities. The steel wire rod and steel wire includes microscopic structures of ferrites and perlites, wherein grain size of the ferrites is lower than 12 [mu]m, and the ferrites contain sub-grains by 20-50 (area)%. The ferrites contains precipitate of AlN. The steel wire rod and steel wire have high toughness.

Description

technical field [0001] The present invention relates to a wire rod and steel wire with excellent toughness and a manufacturing method thereof. Background technique [0002] Wire rod products are generally divided into QT (quenched and tempered) heat-treated steel products and non-heat-treated steel products that ensure the physical properties of the steel only by drawing according to the end customer's purpose. [0003] The strength and toughness / ductility of QT steels depend on the tempering process after austenitizing heat treatment. [0004] The lower the tempering temperature, the greater the strength of the material, but at the same time the ductility / toughness of the product will decrease, and the resistance to hydrogen-induced delayed fracture will also decrease, so it is necessary to maintain an appropriate tempering temperature. In addition, after QT heat treatment, the austenite grain size (AGS) can have a great influence on the physical properties. Generally spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/34C22C38/38C22C38/06C22C38/26C22C38/28C22C38/24C22C38/22C22C38/32C21D8/06
CPCC21D8/065C21D2211/005C21D2211/008C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C38/38C21D8/06C21D9/525C21D2211/004C22C38/18
Inventor 李在胜林男锡朴仁圭
Owner 浦项股份有限公司