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Seamless steel tube heat treatment process

A technology of seamless steel pipe and process, which is applied in the field of seamless steel pipe manufacturing, can solve the problems that steel pipes are difficult to meet user requirements, the mechanical properties of the whole pipe are quite different, and the pipe ends of steel pipes cannot be straightened, etc., so as to achieve reasonable crystal distribution and overall performance Good effect with high concentration of performance indicators

Active Publication Date: 2017-10-10
安徽华飞机械铸锻有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) The mechanical properties of the whole tube are quite different
With the improvement of users' requirements for products, it is difficult for this kind of steel pipe with two ends to meet the requirements of users.
And the bending caused by the stress caused by the temperature difference can be straightened. However, the end of the steel pipe cannot be straightened and some seamless steel pipes do not have a suitable straightening machine, resulting in a decline in the yield of the product or even a failure to become a steel pipe due to the inability to complete the straightening. finished product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A heat treatment process for seamless steel pipes, according to the following steps:

[0029] (1) Annealing: The semi-finished seamless steel pipe after casting is transported to the muffle furnace for annealing treatment. Before the annealing treatment, the annealing furnace is preheated. The preheating temperature is set to 480℃ and the annealing temperature is controlled. At 520℃, the annealing holding time is set to 40min;

[0030] The above-mentioned seamless steel pipe includes the following chemical composition in terms of weight percentage: C 0.21%, Si 0.16%, Mn 0.48%, Ni 0.37%, S 0.01%, P 0.01%, the balance is Fe and inevitable impurities, of which , The content of inevitable impurities is controlled within ≤0.05%;

[0031] (2) Quenching: The annealed seamless steel pipe is then transported to the quenching furnace for quenching treatment, which is divided into the following three stages:

[0032] The temperature for one stage of heating is 780℃, and the holding time ...

Embodiment 2

[0038] A heat treatment process for seamless steel pipes, according to the following steps:

[0039] (1) Annealing: The semi-finished seamless steel pipe after casting is transported to the muffle furnace for annealing treatment. Before the annealing treatment, the annealing furnace is preheated. The preheating temperature is set to 490℃ and the annealing temperature is controlled. At 530℃, the annealing holding time is set to 45min;

[0040] The above-mentioned seamless steel pipe includes the following chemical components in terms of weight percentage: C 0.25%, Si 0.20%, Mn0.52%, Ni 0.42%, S 0.015%, P 0.015%, the balance being Fe and inevitable impurities, of which , The content of inevitable impurities is controlled within ≤0.05%;

[0041] (2) Quenching: The annealed seamless steel pipe is then transported to the quenching furnace for quenching treatment, which is divided into the following three stages:

[0042] The temperature of heating one stage is 7890℃, and the holding time ...

Embodiment 3

[0048] A heat treatment process for seamless steel pipes, according to the following steps:

[0049] (1) Annealing: The semi-finished seamless steel pipe after casting is transported to the muffle furnace for annealing treatment. Before the annealing treatment, the annealing furnace is preheated. The preheating temperature is set to 500℃ and the annealing temperature is controlled. At 540℃, the annealing holding time is set to 50min;

[0050] The above-mentioned seamless steel pipe includes the following chemical components in terms of weight percentage: C 0.43%, Si 0.24%, Mn 0.60%, Ni 0.60%, S 0.02%, P 0.02%, the balance being Fe and inevitable impurities, of which , The content of inevitable impurities is controlled within ≤0.05%;

[0051] (2) Quenching: The annealed seamless steel pipe is then transported to the quenching furnace for quenching treatment, which is divided into the following three stages:

[0052] The temperature of heating one stage is 80℃, and the holding time is ...

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Abstract

The invention discloses a seamless steel tube heat treatment process. The process comprises the following steps that (1) annealing is conducted, specifically, a semi-finished seamless steel tube is conveyed into a muffle furnace for annealing treatment; (2) quenching is conducted, specifically, the annealed seamless steel tube is conveyed into a quenching furnace for quenching treatment through a first heating stage, a second heating stage and a soaking stage; (3) quenching bath pouring soaking is conducted, specifically, the seamless steel tube is discharged from the quenching furnace after quenching is completed and soaked in quenching bath with the temperature being 15-25 DEG C, and the quenching time is 45-55 s; and (4) tempering is conducted, specifically, finally, the seamless steel tube is conveyed into a tempering furnace for tempering treatment, and the seamless steel tube is discharged from the tempering furnace and air-cooled to the room temperature after tempering is completed. Through the heat treatment process, the stability of the performance of the seamless steel tube can be improved, and meanwhile, the phenomenon that seamless steel tubes cannot be straightened and corrected due to bending and nonuniform mechanical performance caused by heat treatment is avoided.

Description

Technical field [0001] The invention relates to the field of seamless steel pipe manufacturing, in particular to a seamless steel pipe heat treatment process. Background technique [0002] The seamless steel pipe heat treatment process is to heat the seamless steel pipe workpiece to a certain temperature for a period of time, and then make it slowly cool down. Seamless steel pipe heat treatment is a heat treatment method in which the steel pipe is heated to a temperature at which phase change or partial phase change occurs, and then slowly cooled after heat preservation. The purpose of heat treatment is to reduce hardness, improve plasticity, and improve processing performance; eliminate internal stress, stabilize steel pipe size, place deformation and cracking; refine grain, improve structure, and improve mechanical properties of seamless steel pipe. [0003] At present, when seamless steel pipes are subjected to heat treatment, after normal heat preservation, as long as the heat...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D1/26C21D1/20C22C38/04C22C38/02C22C38/08
CPCC21D1/20C21D1/26C21D9/08C22C38/02C22C38/04C22C38/08
Inventor 杨胜谢枫
Owner 安徽华飞机械铸锻有限公司
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