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Spinning tube bending nitrogen cooling process

A technology of nitrogen cooling and spinning tube, which is applied in the direction of manufacturing tools, heat treatment process control, furnace, etc., and can solve the problems of fast consumption of spinning tube spare parts and high spare parts cost

Inactive Publication Date: 2008-04-09
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the spare parts of the spinning pipe are consumed very quickly
Its material is 10CrMo918, which is rare in China and has been dependent on imports for a long time, and the cost of spare parts is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The straight pipe (before bending) we use is a high-strength heat-resistant seamless boiler pipe made of 10CrMo918. Its main alloying element content is as follows:

[0018] C 0.08~0.15, Si≤0.5, Mn 0.40~0.70, Cr 2.00~2.50, Mo0.90`1.20. The heat treatment of this kind of steel is generally 900~960℃ for normalizing (A c3 +50℃) and tempering at 700~750℃. The structure obtained by normalizing is ferrite + sorbite. After high-temperature tempering, the stability of the structure can be increased, and the distribution of alloying elements between ferrite and carbide can be rationalized to give full play to the role of alloying elements. The fineness of the pearlite structure obtained after normalizing depends on the cooling rate during normalizing. The faster the cooling rate, the smaller the spacing of the obtained pearlite lamellar (Sorbitite), and the higher the strength and hardness. Therefore, an effective way to strengthen the spinning pipe is to treat it with nitro...

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Abstract

The invention provides the cooling technics of nitrogen gas produced by bending spin pipe, the step is as follows: (1) both ends of a straight pipe used for spin pipe are welded, drilled, and tapped, and then are heated for five minutes through seven minutes in a heating furnace with the temperature between 980 DEG C and 1050 DEG C; (2) the siphon machine is sent to a tube bender to mold within 30 seconds after drawing from the furnace, and then is provided with a case-hardened clip; (3) the head of pipe is jointed, by wafting the nitrogen gas of lower temperature into the pipe, the cooling is accelerated with the rate of reducing temperature between 65 DEG C and 80 DEG C per second, and the reduced temperature reaches between 30 DEG C and 60 DEG C; (4) the pipe is taken from the siphon machine after being naturally cooled to room temperature. The nitrogen gas of lower temperature is wafted into the pipe, and the lower temperature of the nitrogen gas is between minus 300 DEG C and minus 280 DEG C.

Description

technical field [0001] The invention relates to a nitrogen cooling process for bending a spinning tube, which belongs to the heat treatment technology for the spinning tube. Background technique [0002] Laying machine is one of the key equipment of high-speed wire rod production line. Its function is: the wire rod after high-speed rolling is formed into a coil with a diameter of 1040 to 1100mm through the laying machine. The assembly of the laying tube on the laying machine is the core component of the coiling of the wire rod, and it is also the wearing part that is frequently replaced according to the tonnage in the laying machine. In actual production, the laying tube: [0003] The working environment is harsh (the temperature is higher than 800 degrees; the vibration is as high as 2.5mm / S; the speed can reach 2247r / min); the wear speed is fast (the wire passes through the spinning tube at a maximum speed of 120m / s); the quality requirements are high (the process require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D11/00
Inventor 程先舟申清潭熊建良黄汉东褚双学李飞
Owner 武钢集团有限公司
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