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Stress relief annealing process of non-quenched and tempered steel for direct cutting

A technology of stress relief annealing and non-quenched and tempered steel, applied in the field of steel heat treatment, can solve the problem of high surface hardness, achieve the effects of low equipment requirements, prevent cracking, and shorten the production cycle

Inactive Publication Date: 2021-06-18
JIANGSU LIANFENG ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies in the above-mentioned prior art, the purpose of the present invention is to overcome the technical defects in the prior art, and provide a non-quenched and tempered steel stress-relief annealing process for direct cutting, which solves the problem of non-quenched and tempered steel in the prior art. The problem of high surface hardness after controlled rolling and straightening of round steel

Method used

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  • Stress relief annealing process of non-quenched and tempered steel for direct cutting
  • Stress relief annealing process of non-quenched and tempered steel for direct cutting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put the size of the non-tangible steel after the specification φ85, the straight cut, in the middle, and the tail is bundled, the purpose is to prevent straightening of the round steel bending rebound; then put in the specification is 9.8m * 3.5m * 3M trolley type annealing furnace, where annealing furnace under the upper housing is ≥ 500mm, the spacer spacer is separated from the rail, the spacing is 1200mm, ensuring the burner flame operation within the horn gap; the side wall of the annealing furnace Distributed 16 thermocouples accurately measure the temperature of the furnace;

[0024] (2) The annealing furnace is warmed to 450 ° C, and the temperature is 70 ° C / h.

[0025] (3) The holding time is stopped and heated, and the non-regulatory steel is cooled to 300 ° C with the furnace, and the cooling rate is 30 ° C / h.

[0026] (4) After cooling, directly cut the non-tangible steel remove the annealing furnace, air cooling to room temperature.

Embodiment 2

[0028] (1) Put the specification φ110, straight cut into the head of non-tangible steel, in the middle, and the tail is bundled, the purpose is to prevent straightening of round steel bending rebound; then put in the specification is 9.8m * 3.5m * 3M trolley type annealing furnace, where annealing furnace under the upper housing is ≥ 500mm, the spacer spacer is separated from the rail, the spacing is 1200mm, ensuring the burner flame operation within the horn gap; the side wall of the annealing furnace Distributed 16 thermocouples accurately measure the temperature of the furnace;

[0029] (2) The annealing furnace is warmed to 520 ° C, and the temperature is 70 ° C / hr, heat insulation for 18 hours;

[0030] (3) After the holding time is stopped, the heating is stopped, and the non-regulatable steel is cut directly to 150 ° C, and the cooling rate is 50 ° C / h.

[0031] (4) After cooling, directly cut the non-tangible steel remove the annealing furnace, air cooling to room temp...

Embodiment 3

[0033] (1) Put the size of the non-tangible steel after the specification φ140, the straight cut, in the middle, and the tail is bundled, the purpose is to prevent straightening of the round steel bending rebound; then put in the specification 9.8m * 3.5m * 3M trolley type annealing furnace, where annealing furnace under the upper housing is ≥ 500mm, the spacer spacer is separated from the rail, the spacing is 1200mm, ensuring the burner flame operation within the horn gap; the side wall of the annealing furnace Distributed 16 thermocouples accurately measure the temperature of the furnace;

[0034] (2) The annealing furnace is warmed to 540 ° C, and the temperature increase rate is 70 ° C / h.

[0035] (3) The holding time is stopped and heated, and the non-regulatory steel is directly cut into 300 ° C, and the temperature is 40 ° C / h.

[0036] (4) After cooling, directly cut the non-tangible steel remove the annealing furnace, air cooling to room temperature.

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Abstract

The invention belongs to the technical field of steel heat treatment, and relates to a stress relief annealing process of non-quenched and tempered steel for direct cutting. The process comprises the steps that firstly, the head, the middle and the tail of straightened non-quenched and tempered steel are bundled through packing wires, and then the straightened non-quenched and tempered steel is placed in an annealing furnace; the temperature of the annealing furnace is increased to 450-560 DEG C, and then heat preservation is conducted for 8-20 hours; heating is stopped after the heat preservation time of the annealing furnace is up, and the non-quenched and tempered steel for direct cutting is cooled to 150-300 DEG C along with the furnace; and after cooling, the non-quenched and tempered steel for direct cutting is moved out of the annealing furnace, discharged out of the furnace and cooled to the room temperature. According to the stress relief annealing process of the non-quenched and tempered steel for the direct cutting provided by the invention, the structure and performance of the non-quenched and tempered steel can be improved, residual stress in the machining process is eliminated, new stress is prevented from being generated, the cracking phenomenon is prevented, and the problem that in the prior art, the surface hardness of the non-quenched and tempered steel is high after controlled rolling and controlled cooling and round steel straightening is solved; and meanwhile, the energy consumption and the production cost can be greatly reduced.

Description

Technical field [0001] The present invention belongs to the technical field of steel heat treatment, and specifically, a non-regulating steel removal process for direct cutting is directly cutting. Background technique [0002] Direct cutting with non-tangled steel as an energy conservation and environmental protection, short production cycle, comparable characteristics of performance and tuning steel is a typical special steel, high value and vast market prospects. Non-tuning steel is performed by controlling the control of the cold process to achieve the performance of the tuning steel. Since there is a clear requirement for the curvature of the round steel (not more than 2mm / m), the seven roller straightening (pre-correction) and two rolls The strand of straightening steel is controlled within 1 mm / m, preventing the round steel strapping from the curved releasing retraction to releasing the round steel to rebound, due to non-tangible steel, the cold surface hardness Excess...

Claims

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Application Information

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IPC IPC(8): C21D1/30C21D6/00
CPCC21D1/30C21D6/00
Inventor 高华耀刘栋林周湛江宏亮曹剑山杜龑朱康宁杨阳
Owner JIANGSU LIANFENG ENERGY EQUIP
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