Heat treatment process method and system for hot rolled seamless steel tubes

Abstract

The invention discloses a heat treatment process method and a heat treatment system for hot rolled seamless steel tubes. The heat treatment process method comprises the following steps of: 1) charging; 2) quenching heating: heating the steel tubes in a quenching furnace (3), wherein the quenching furnace (3) is a gas walking-beam-type heating furnace; 3) descaling by using high pressure water: removing scales on the surfaces of the heated and discharged steel tubes by using a high pressure water descaling device (4); 4) quenching by using a tunnel quenching device (5); 5) tempering heating, wherein a tempering furnace (7) is a gas walking-beam-type heating furnace; 6) straightening and cooling; 7) performing nondestructive testing; and 8) collecting finished products and semi-finished products: collecting steel tubes without defects on a finished product collecting rack (17), and collecting the semi-finished products with defects on a semi-finished product collecting rack (16). The gas walking-beam-type heating furnaces are adopted for quenching heating and tempering heating of the steel tubes, so that the steel tubes are heated uniformly, and the steel tubes subjected to heat treatment have high structure property. The quenching is carried out in a tunnel water quenching mode, water consumption is low, energy is saved, production safety is ensured, and equipment is easy to maintain.

Description

technical field [0001] The invention relates to a heat treatment process and system for hot-rolled seamless steel pipes, belongs to the technical field of steel pipe heat treatment, and can also be used for heat treatment of thickened oil casings and drill pipes. Background technique [0002] The existing heat treatment process for hot-rolled seamless steel pipes mainly includes processes such as quenching heat treatment, quenching, tempering heating, straightening, cooling bed cooling, flaw detection, and product collection. In the process of quenching heat treatment, the current method is to heat the steel pipe with an electric induction coil. This method has a limitation in the holding time, and the overall temperature uniformity of the steel pipe is poor. The difference between the temperature of the thickened part at the end of the steel pipe and the temperature of the pipe body will cause problems such as differences in the organizational state and mechanical propertie...

AI Technical Summary

Problems solved by technology

In the process of quenching heat treatment, the current method is to heat the steel pipe with an electric induction coil. This method has a limitation in the holding time, and the overall temperature uniformity of the steel pipe is poor. The difference between the temperature of the thickened part at the end of the steel pipe and the temperature of the pipe body will cause problems such as differences in the organizational state and mechanical properties of the pipe end and the pipe body; in addition, the installation required for the method of heating the steel pipe with an electric induction coil Very large capacity, high power consumption resulting in high daily operating costs

Quenching treatment usually uses external shower and internal spray quenching equipment to perform water quenching on steel pipes, which requires a lot of water, which increases the consumption of water resources and energy

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