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Online Heat Treatment and Offline Heat Treatment of Seamless Square Tubes

Date:2019-08-22    keywords:seamless square tube
The overall heat treatment process and overall heat treatment of the seamless square tube are characterized in that there is no temperature difference in the pipe wall during the treatment process, no residual stress is generated, the heating and holding time can be adjusted, and the complicated heat treatment specification can be adapted, and a computer can also be used. Automatic control is carried out, but the roller hearth furnace equipment is complicated and the operation cost is high. Seamless square tube overall heat treatment: can be divided into online heat treatment and offline heat treatment.

First, online heat treatment: after the seamless square tube is welded, use two or more medium frequency annular induction heating devices to heat the whole tube, and heat it to the normal temperature of 900-920°C in a short time. After a certain period of time, the air is cooled to 400°C or less and then cooled normally, so that the whole tube structure is improved. The seamless square tube integral heat treatment device has a chamber furnace and a roller hearth furnace, and a nitrogen or hydrogen-nitrogen mixed gas is used as a protective atmosphere to achieve an oxidation-free or bright state. Due to the low production efficiency of chamber furnaces, roller-type continuous heat treatment is currently used.

Second, the seamless square tube is an important transmission medium for transporting gas and liquid. It is very necessary to do the installation work before using the straight seam steel pipe. Apply lubricant to the outer surface of the seamless square tube socket and the apron: apply the lubricant evenly on the inner surface of the apron installed on the socket, and apply the lubricant to the outer surface of the socket. Install all the socket parts and install the equipment: Install the prepared seamless square tube equipment in place. Be careful not to pollute the cleaned parts again during installation. Clean the nozzle: Remove all debris from the socket and clean it.

Third, clean the rubber ring and the upper rubber ring: clean the adhesive on the rubber ring, bend the rubber ring into a plum shape or an 8-shaped shape into the socket, and press it along the entire rubber ring by hand. Once again, use a rubber mallet to ensure that all parts of the apron are evenly caught in the groove. The tube should be lowered to the bottom of the tank as required by the pipe, usually by manual or mechanical down tube method. Push the tube to insert it into the socket: When installing the seamless square tube, first put the socket into the socket and press the socket onto the rubber ring in the socket, connect the wire rope and the chain, and tighten the chain until the socket is inserted. The sockets are all in place, and a gap of about 2 mm should be left between the socket and the socket, and the distance from the outer edge of the socket to the apron is consistent. Mainly to ensure the smooth installation of the nozzle.

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