Technique for producing shining stainless steel pipe

A stainless steel tube and production process technology, applied in the field of natural color whitening treatment of stainless steel tubes, can solve the problems of corroded skin, pulmonary edema, sore throat, etc., and achieve the effect of accelerating the cooling speed, high safety, and ensuring the surface quality of the finished product

Inactive Publication Date: 2017-02-22
广州永大不锈钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pickling passivation paste will corrode the skin in contact with the skin, and if it is

Method used

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  • Technique for producing shining stainless steel pipe

Examples

Experimental program
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Effect test

Example Embodiment

[0027] Example 1

[0028] The specific embodiments of the present invention are as figure 1 As shown, a process for producing bright stainless steel pipes uses equipment including a heat treatment tank 1, a cooling pipe 2 and a water washing tank 3 arranged in sequence along the moving direction of the stainless steel pipe 4. The heat treatment box 1 is provided with a high-frequency heating tube 11 with a coil wound on the outside, and the stainless steel tube 4 passes through the high-frequency heating tube 11. Both the heat treatment box 1 and the cooling pipe 2 are filled with a protective gas with a pressure of 0.4 MPa, and the protective gas is nitrogen. The washing tank 3 is provided with a water inlet 31 and a water outlet 32, wherein the water inlet 31 and the water outlet 32 ​​are arranged in sequence in the direction opposite to the movement direction of the stainless steel pipe 4, and the water inlet 31 is arranged at the bottom of the water washing tank 3, and the w...

Example Embodiment

[0035] Example 2

[0036] The difference from Example 1 is that both the heat treatment box 1 and the cooling pipe 2 are filled with nitrogen gas with a pressure of 0.65 MPa. The production process of bright stainless steel pipe includes unwinding, forming, welding, and cutting. Among them, the following steps are included between welding and cutting:

[0037] 1) Heat treatment steps: Place the stainless steel tube 4 in a heat treatment box 1 filled with nitrogen, the air pressure in the heat treatment box 1 is 0.65MPa; the temperature of the stainless steel tube 4 reaches 1100°C, and the heat treatment time is 300 seconds;

[0038] 2) Cold treatment step: move the stainless steel tube 4 to the cooling pipe 2 filled with nitrogen to cool naturally, the cold treatment time is 420 seconds, and the air pressure in the cooling pipe 2 is 0.65MPa;

[0039] 3) Cleaning step: the stainless steel pipe 4 is moved to the water washing tank 3, and the stainless steel pipe 4 is cleaned by the clea...

Example Embodiment

[0040] Example 3

[0041] The difference from Example 1 is that both the heat treatment box 1 and the cooling pipe 2 are filled with nitrogen with a pressure of 0.5 MPa. The production process of bright stainless steel pipe includes unwinding, forming, welding, and cutting. Among them, the following steps are included between welding and cutting:

[0042] 1) Heat treatment steps: Place the stainless steel tube 4 in a heat treatment box 1 filled with nitrogen, the air pressure in the heat treatment box 1 is 0.5 MPa; the temperature of the stainless steel tube 4 reaches 1060°C, and the heat treatment time is 360 seconds;

[0043] 2) Cold treatment step: move the stainless steel tube to the cooling pipe 2 filled with nitrogen for natural cooling, the cold treatment time is 360 seconds, and the air pressure in the cooling pipe 2 is 0.5 MPa;

[0044] 3) Cleaning step: the stainless steel pipe 4 is moved to the water washing tank 3, and the stainless steel pipe 4 is cleaned by the clean wat...

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Abstract

The invention discloses a technique for producing a shining stainless steel pipe. The technique comprises the steps of unreeling, forming, welding and cutting. Between the welding step and the cutting step, the technique further comprises the following steps that the stainless steel pipe is firstly placed into a heat treatment box filled with protective gas, air pressure in the heat treatment box is 0.4MPa-0.65MPa, the temperature of the stainless steel pipe is made to reach 1000 DEG C-1100 DEG C, and the time of heat treatment is 300-420 seconds; and then the stainless steel pipe is moved to a cooling pipe filled with protective gas to be cooled naturally, the time of cooling treatment is 300-420 seconds, and the pressure in the cooling pipe is 0.4MPa-0.65MPa. According to the technique for producing the shining stainless steel pipe, an original step that the stainless steel pipe is conveyed to a heat treatment station after being cut is omitted; and when the surface of the stainless steel pipe is subjected to heat treatment, grey black oxide skin is not generated, subsequent acid pickling and polishing are not needed, the working process is simpler, and pollution is avoided in the production process.

Description

technical field [0001] The invention relates to the field of natural color whitening treatment of stainless steel pipes, in particular to a production process for bright stainless steel pipes without pickling. Background technique [0002] During the current stainless steel pipe processing process, after being uncoiled, formed, welded and cut in sequence, it is transported to a heat treatment station and annealed in an air environment. In this production process, since the stainless steel tube forming process and the heat treatment process are separated into two lines, it is necessary to set up a special place to place the stainless steel tube on the way to move the cut stainless steel tube to the heat treatment station, and the transportation process is time-consuming and requires additional Transportation Equipment. The surface of the steel plate used to be processed into stainless steel pipes is relatively bright in the rolled state, but when annealed in an air environme...

Claims

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Application Information

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IPC IPC(8): C21D1/74C21D9/08C21D1/42B23P15/00
CPCB23P15/00C21D1/42C21D1/74C21D9/085Y02P10/25
Inventor 曹俊杰袁进生
Owner 广州永大不锈钢有限公司
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