Heat treatment method for steel cylinder for liquefied petroleum gas

A technology of liquefied petroleum gas and heat treatment methods, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of mechanical property attenuation, unreasonable design of heat treatment process temperature, and incomplete elimination of welding stress

Inactive Publication Date: 2009-07-08
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art that the welding stress is not completely eliminated or the mechanical properties are severely attenuated due to the unreasonable design of the heat treatment process temperature, and to provide a liquefied petroleum gas cylinder made of hot-rolled steel plates. heat treatment method

Method used

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  • Heat treatment method for steel cylinder for liquefied petroleum gas
  • Heat treatment method for steel cylinder for liquefied petroleum gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use HP295 hot-rolled steel plate to make steel cylinders and weld them. Heat the heat treatment furnace to 660°C, send the liquefied petroleum gas cylinders into the heat treatment furnace, make the temperature of the liquefied petroleum gas cylinders gradually reach 660°C, and keep them in the furnace for 6 minutes. Finally, take the liquefied petroleum gas cylinder out of the heat treatment furnace, and let it cool naturally in the air to eliminate all stress. The mechanical properties at a temperature of 660°C are: the tensile strength Rm is 460MPa, the yield strength ReL is 360MPa, the elongation A is 37%, and the reduction of area Z is 67%. The attenuation of mechanical properties at this temperature is low, and the attenuation range of tensile strength and yield strength is only 15MPa, while the elongation and area reduction rate remain unchanged or increase, ensuring the service performance of the steel cylinder.

Embodiment 2

[0023] Use HP295 hot-rolled steel plate to make steel cylinders and weld them, heat the heat treatment furnace to 680°C, send the liquefied petroleum gas cylinders into the heat treatment furnace, make the temperature of the liquefied petroleum gas cylinders gradually reach 680°C, keep them in the furnace for 4 minutes, Finally, take the liquefied petroleum gas cylinder out of the heat treatment furnace, and let it cool naturally in the air to eliminate all stress. The mechanical properties at a temperature of 680°C are: the tensile strength Rm is 465MPa, the yield strength ReL is 365MPa, the elongation A is 37%, and the reduction of area Z is 66%. The attenuation of mechanical properties at this temperature is low, and the attenuation range of tensile strength and yield strength is only 10MPa, while the elongation and area reduction remain unchanged, which ensures the service performance of the steel cylinder.

Embodiment 3

[0025] Use HP295 hot-rolled steel plate to make steel cylinders and weld them. Heat the heat treatment furnace to 690°C, send the liquefied petroleum gas cylinders into the heat treatment furnace, make the temperature of the liquefied petroleum gas cylinders gradually reach 690°C, and keep them in the furnace for 8 minutes. Finally, take the liquefied petroleum gas cylinder out of the heat treatment furnace, and let it cool naturally in the air to eliminate all stress. The mechanical properties at a temperature of 690°C are: the tensile strength Rm is 455MPa, the yield strength ReL is 350MPa, the elongation A is 37%, and the reduction of area Z is 65%. The attenuation of mechanical properties at this temperature is low, the attenuation range of tensile strength and yield strength is only 20MPa and 25MPa, while the elongation remains unchanged, and the attenuation of section shrinkage is very low, which can completely guarantee the service performance of the steel cylinder.

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Abstract

The invention relates to a thermal treatment method for liquefied petroleum gas containers made of hot rolled steel plates.The thermal treatment method comprises the following steps: heating a heat treatment furnace to a temperature in the range of 660 DEG C - 690 DEG C, putting the liquefied petroleum gas containers into the heat treatment furnace, when the temperature of the liquefied petroleum gas containers reach 660 DEG C - 690 DEG C, preserving the temperature for 4-10 minutes, taking out the liquefied petroleum gas containers from the heat treatment furnace and cooling them in the air; according to the invention, the liquefied petroleum gas containers after thermal treatment have excellent and synthetic mechanical properties through the thermal treatment processes of controlling heating temperature, temperature-preserving time, cooling mode and the like.

Description

technical field [0001] The invention relates to a liquefied petroleum gas pressure vessel, in particular to a heat treatment method for a liquefied petroleum gas cylinder made of hot-rolled steel plates. Background technique [0002] A refillable mobile steel gas cylinder used to hold compressed gas or high-pressure liquefied gas is referred to as a steel cylinder for short, and a liquefied petroleum gas cylinder is a steel cylinder used to hold liquefied petroleum gas as one of petroleum products. With the development of the economy and the improvement of people's living standards, the use of liquefied petroleum gas cylinders is becoming more and more common, especially as a fuel for households or public restaurants. However, the liquefied petroleum gas cylinder is a very dangerous equipment, and the liquefied petroleum gas it stores is a compressed gas with high pressure, flammable and explosive. Therefore, the safety of liquefied petroleum gas cylinders is very important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00
Inventor 宋立秋
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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