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Spheroidizing annealing method for low-alloy high-strength welding wire

A low-alloy, high-strength, annealing technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of plasticity decrease, work hardening index increase, etc., and achieve the effect of plasticity increase and good drawing process performance

Inactive Publication Date: 2017-02-15
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a low-alloy high-strength welding wire spheroidizing annealing method, aiming to solve the problems of increased work hardening index and excessive decrease in plasticity caused by the existing process to the welding wire

Method used

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  • Spheroidizing annealing method for low-alloy high-strength welding wire
  • Spheroidizing annealing method for low-alloy high-strength welding wire
  • Spheroidizing annealing method for low-alloy high-strength welding wire

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Effect test

Embodiment 1

[0035] The ER80S-G welding wire is used as the raw material, and the method of the present invention is used for annealing treatment, and the actual effect is judged by the metallographic structure before and after annealing and whether the wire is smooth and broken during the drawing process. Determine its A by the thermal expansion method C1 The point is 740°C. The specific steps are:

[0036] 1) Use a bell-type atmosphere protection furnace to heat the ER80S-G welding wire to 690~710°C for 12 hours;

[0037] 2) Cool the ER80S-G welding wire in step 1) to 160°C with the furnace, then air cool to room temperature to complete the annealing operation.

[0038] Figure 1-A It is the metallographic diagram of unannealed welding wire. The structure is ferrite, dispersed carbide and discontinuously distributed island-shaped bainite. The welding wire has high strength and hardness and poor plasticity. Figure 1-B It is the metallographic diagram of the welding wire after recrysta...

Embodiment 2

[0041] Using 76-G welding wire as raw material, the method of the present invention is used for annealing treatment, the actual effect is judged by the metallographic structure before and after annealing and whether the drawing process is smooth and broken wire, and the A C1 The point is 730°C. The specific steps are:

[0042] 1) Use a bell-type atmosphere protection furnace to heat the 76-G welding wire to 680~700°C for 14 hours;

[0043] 2) After cooling the 76-G welding wire in step 1) to 180°C with the furnace, air-cool to room temperature to complete the annealing operation.

[0044] Figure 2-A It is the metallographic diagram of unannealed welding wire. The structure is ferrite, dispersed carbide and discontinuously distributed island-shaped bainite. The welding wire has high strength and hardness and poor plasticity. Figure 2-B It is the metallographic diagram of the welding wire after recrystallization annealing. The structure is ferrite and fine spherical carbide...

Embodiment 3

[0047] Using SMHG-700 welding wire as raw material, the method of the present invention is used for annealing treatment, the actual effect is judged by the metallographic structure before and after annealing and whether the drawing process is smooth and broken wire, and the A C1 The point is 710°C. The specific steps are:

[0048] 1) Heat the SMHG-700 welding wire to 660~680°C for 14 hours in a bell-type atmosphere protection furnace;

[0049] 2) Cool the SMHG-700 welding wire in step 1) to 180°C with the furnace, then air cool to room temperature to complete the annealing operation.

[0050] Figure 3-A It is the metallographic diagram of unannealed welding wire. The structure is a small amount of ferrite, discontinuously distributed island-shaped bainite and dispersed carbide. The welding wire has high strength and hardness, and poor plasticity and toughness. Figure 3-B It is the metallographic diagram of the welding wire after recrystallization annealing. The structure is...

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Abstract

The invention discloses a spheroidizing annealing method for a low-alloy high-strength welding wire. The spheroidizing annealing method for the low-alloy high-strength welding wire comprises the steps that firstly, the low-alloy high-strength welding wire to be drawn is heated to the annealing temperature firstly and subjected to heat preservation for a set heating time; and secondly, the low-alloy high-strength welding wire to be drawn is air-cooled to the room temperature after being cooled to a set temperature in a furnace, and thus annealing operation is completed. A welding wire rod treated through the method is subjected to recrystallization annealing, so that the structure with spheroidite distributed on a ferrite matrix is obtained; and thus the strength of materials is reduced and the plasticity of the materials is improved.

Description

technical field [0001] The invention belongs to the field of heat treatment of metal materials, and in particular relates to a method for spheroidizing and annealing low-alloy high-strength welding wire. Background technique [0002] The welding wire is drawn from a wire rod with a certain diameter at room temperature. Due to cold work hardening, its plasticity cannot meet the requirements, and it often breaks during the drawing process. The structure of wire rod is mainly composed of ferrite and pearlite or ferrite + bainite, which has high strength and hardness, but poor plasticity. The wire rod used for wire drawing requires low tensile strength, good plasticity, and the matrix is ​​ferrite with more content and slightly coarser grains. The plastic deformation of the wire rod is mainly provided by ferrite. Therefore, the reduction of the ferrite structure in the wire rod will reduce the plasticity of the wire rod. The wire rod needs to be annealed before drawing to impr...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D9/52
CPCC21D1/32C21D9/525C21D2211/005
Inventor 罗昌森罗宏李欣雨张晓柏李昊郑海佘应堂刘涛
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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