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Manufacturing method for silicon-containing stainless steel seamless tube

A manufacturing method, stainless steel technology, applied in the control field of silicon-containing stainless steel 16Cr25Ni20Si2 cold-worked surface quality, to achieve the effects of shortening the holding time, increasing the heat treatment temperature, and saving operating costs

Active Publication Date: 2014-08-06
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] The above heat treatment and pickling tests show that pitting and residual scale on the surface of the finished pipe cannot be avoided with different heat treatment temperatures and different pickling times.

Method used

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  • Manufacturing method for silicon-containing stainless steel seamless tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 (Steel pipe representative specification φ38×3mm)

[0047] 1. Tube billet heating—piercing → cold rolling → (short-time high temperature) heat treatment → (both forward and reverse) straightening → pickling.

[0048] 2. Heat treatment in a roller hearth heat treatment furnace, the temperature is 1090°C, the heat preservation coefficient is 1.0min / mm, and the heat preservation time is 1.0min / mm×3mm=3.0min. Pickling, the surface has no pitting and residual scale, and the mechanical properties of the finished product are qualified. (See Table 4 below)

[0049] 3. Steel pipe heating, piercing and other processes are conventional steel pipe processes, the implementation process is smooth, the mechanical properties of the finished product are qualified, the surface quality is good, and there is no impact on environmental protection and safety.

Embodiment 2

[0050] Example 2 (the steel pipe represents the finished product specification 38×3mm)

[0051] 1. Tube billet heating—piercing → cold rolling → (short-time high temperature) heat treatment → (both forward and reverse) straightening → pickling.

[0052] 2. Heat treatment in a roller hearth heat treatment furnace with a temperature of 1100°C, a heat preservation coefficient of 1.2min / mm, and a heat preservation time of 1.2min / mm×3mm=3.6min. Pickling, the surface has no pitting and residual scale, and the mechanical properties of the finished product are qualified. (See Table 4 below)

[0053] 3. Steel pipe heating, piercing and other processes are conventional steel pipe processes, the implementation process is smooth, the mechanical properties of the finished product are qualified, the surface quality is good, and there is no impact on environmental protection and safety.

Embodiment 3

[0054] Example 3 (the steel pipe represents the finished product specification 38×3mm)

[0055] 1. Tube billet heating—piercing → cold rolling → (short-time high temperature) heat treatment → (both forward and reverse) straightening → pickling.

[0056] 2. Heat treatment in a roller hearth heat treatment furnace, the temperature is 1110°C, the heat preservation coefficient is 1.3min / mm, and the heat preservation time is 1.3min / mm×3mm=3.9min. Pickling, the surface has no pitting and residual scale, and the mechanical properties of the finished product are qualified. (See Table 4 below)

[0057] 3. Steel pipe heating, piercing and other processes are conventional steel pipe processes, the implementation process is smooth, the mechanical properties of the finished product are qualified, the surface quality is good, and there is no impact on environmental protection and safety.

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Abstract

The invention discloses a manufacturing method for a silicon-containing stainless steel seamless tube. The method comprises the following procedures: heating of a tube blank; perforating; cold rolling; heat treatment; straightening; and pickling. In the procedure of heat treatment, a short-time high-temperature heat treatment process is employed, heat treatment temperature is 1090 to 1110 DEG C, a heat preservation coefficient is 0.8 to 1.5 min / mm, and heat preservation time is determined according to steel tube thickness and is calculated by multiplying the heat preservation coefficient with the steel tube thickness; and in the procedure of straightening, a forward-backward bidirectional straightening method is employed, backward straightening is carried out after original unidirectional straightening, so the effect of integral fragmentation of a surface oxide skin is realized. According to the invention, the short-time high-temperature heat treatment process is employed, so the surface oxide skin becomes thinner and loose after heat treatment, which facilitates easy removal of the oxide skin during pickling; the forward-backward bidirectional straightening method is employed for integral fragmentation of the surface oxide skin, so the oxide skin left in pickling is eliminated, a better fragmentation effect is exerted on the loose oxide skin, and product surface quality after pickling is further guaranteed.

Description

technical field [0001] The invention relates to a method for manufacturing an austenitic heat-resistant stainless steel seamless pipe in the metallurgical industry, in particular to a method for controlling the surface quality of the cold-worked surface of silicon-containing stainless steel 16Cr25Ni20Si2. Background technique [0002] Conventional stainless steel is generally austenitic Cr-Ni stainless steel. Si element in this type of steel is used as an impurity element, and the Si content is generally required to be controlled at ≤1.0%. For silicon-containing austenitic stainless steel 16Cr25Ni20Si2, Si is added as a beneficial element (the content of Cr and Ni needs to be adjusted), and the Si content is required to be controlled at 1.5-2.5%. [0003] Silicon-containing stainless steel 16Cr25Ni20Si2 is an austenitic heat-resistant stainless steel with excellent oxidation resistance. It is widely used in the manufacture of various heat-resistant components of heating fur...

Claims

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Application Information

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IPC IPC(8): B21C37/06
Inventor 王绪年陈永芳陈久锋袁卫昌
Owner 宝武特种冶金有限公司
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