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Simulated post-weld heat treatment method of large thickness SA516Gr60 steel plate

A post-weld heat treatment and large-thickness technology, applied in the field of heat treatment, can solve the problems of increased difficulty in steel plate production, achieve stable comprehensive mechanical properties, improve production efficiency, and simplify the production process

Inactive Publication Date: 2018-11-16
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the steel plate needs to be welded after rolling, the mechanical properties of the welded joint directly affect the service life of the equipment. After welding the container steel plate, in order to eliminate the welding stress and repair the equipment in the subsequent process, it is generally necessary to perform simulated post-weld heat treatment. The performance after heat treatment directly reflects the performance of the equipment. With the increasing trend of the thickness of the steel plate used in recent years, in order to ensure the mechanical properties of the simulated steel plate after welding, the production difficulty of the steel plate has increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The thickness of the SA516Gr60 steel plate in this embodiment is 90mm, and the simulated post-weld heat treatment method includes temperature-controlled heating, temperature maintenance, and temperature-controlled cooling procedures. The specific process steps are as follows:

[0016] (1) Temperature-controlled heating process: the sample is temperature-controlled heated in a resistance furnace, the furnace temperature is 300°C, and the heating rate is controlled at 55°C / h;

[0017] (2) Temperature maintenance process: control the furnace temperature at 620°C, and control the holding time at 570 minutes;

[0018] (3) Temperature-controlled cooling process: After the sample reaches the temperature of the furnace, it is cooled in the furnace at a rate of 80°C / h. When the furnace temperature drops to 300°C, the sample is taken out of the furnace and cooled in the air.

[0019] In this example, after simulated post-weld heat treatment, the 1 / 2 position of the SA516Gr60 stee...

Embodiment 2

[0021] The thickness of the SA516Gr60 steel plate in this embodiment is 93mm, and the simulated post-weld heat treatment method includes temperature-controlled heating, temperature maintenance, and temperature-controlled cooling procedures. The specific process steps are as follows:

[0022] (1) Temperature-controlled heating process: the sample is temperature-controlled heated in a resistance furnace, the furnace temperature is 290°C, and the heating rate is controlled at 80°C / h;

[0023] (2) Temperature maintenance process: control the furnace temperature at 640°C, and control the holding time at 570 minutes;

[0024] (3) Temperature-controlled cooling process: After the sample reaches the time for maintaining the furnace temperature, the temperature is lowered in the furnace at a rate of 60°C / h. When the furnace temperature drops to 285°C, the sample is taken out of the furnace and cooled in the air.

[0025] In this example, after simulated post-weld heat treatment, the 1 / ...

Embodiment 3

[0027] The thickness of the SA516Gr60 steel plate in this embodiment is 95mm, and the simulated post-weld heat treatment method includes temperature-controlled heating, temperature-maintaining, and temperature-controlled cooling procedures. The specific process steps are as follows:

[0028] (1) Temperature-controlled heating process: the sample is temperature-controlled heated in a resistance furnace, the furnace temperature is 280°C, and the heating rate is controlled at 70°C / h;

[0029] (2) Temperature maintenance process: control the furnace temperature at 630°C, and control the holding time at 580 minutes;

[0030] (3) Temperature-controlled cooling process: After the sample reaches the temperature of the furnace, it is cooled in the furnace at a rate of 70°C / h. When the furnace temperature drops to 285°C, the sample is taken out of the furnace and cooled in the air.

[0031] In this example, after simulated post-weld heat treatment, the thickness of SA516Gr60 steel plate...

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Abstract

The invention discloses a simulated post-weld heat treatment (SPWHT) method of a large thickness SA516Gr60 steel plate. The SPWHT method comprises steps of temperature controlled heating, temperaturemaintaining, and temperature controlled cooling. The thickness of the SA516Gr60 steel plate is 90 to 100 mm. The charging temperature, the discharging temperature, the temperature rising speed, and the temperature maintaining time of SPWHT are controlled to ensure that the comprehensive mechanical properties of the steel plate are stable after SPWHT. The problem that the properties of the steel are not stable after welding or maintenance is solved. After SPWHT, the position (1 / 2 thickness) of the steel plate has good toughness and the method is suitable for steel plate production. The performances of the position (1 / 2 thickness) of the steel plate after SPWHT: tensile strength Rm 415 to 550 MPa, yield strength Rp 0.2>=220 MPa, elongation percentage >=25%, and impact energy (-46 DEG C) >=20J. The production process is simple, the method is suitable for massive production, and the production efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a simulated post-weld heat treatment method for a large-thickness SA516Gr60 steel plate. Background technique [0002] SA516Gr60 steel plate is a low-temperature steel used in the ASME code of the United States. Because of its good comprehensive mechanical properties and process properties, it is often used in the manufacture of medium and low temperature pressure vessels. At present, the development trend of pressure vessels is large-scale and high-pressure. [0003] Since the steel plate needs to be welded after rolling, the mechanical properties of the welded joint directly affect the service life of the equipment. After welding the container steel plate, in order to eliminate the welding stress and repair the equipment in the subsequent process, it is generally necessary to perform simulated post-weld heat treatment. The performance after heat treatment dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D9/00
CPCC21D9/50C21D9/0081
Inventor 李杰龙杰王甜甜丁文科尹卫江瞿征刘彦强
Owner WUYANG IRON & STEEL
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