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High-temperature resistant seamless austenitic stainless steel pipe and preparation method thereof

A technology of austenitic stainless steel and seamless steel pipe, applied in the field of iron and steel materials, can solve the problems of low performance, toughness, durable strength, oxidation resistance and poor high temperature microstructure stability, and achieves improved mechanical properties, increased oxidation resistance, high Effect of recrystallization temperature

Inactive Publication Date: 2015-08-12
SUZHOU GOLDEN WAY STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing austenitic heat-resistant stainless steel seamless pipe has low performance, poor toughness, durable strength, oxidation resistance and high-temperature structure stability, and cannot meet the above requirements. In order to meet these stringent requirements, it is necessary to develop a new type of high-temperature resistant austenitic Stellite seamless pipe

Method used

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Examples

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Effect test

preparation example Construction

[0020] The method for preparing the above-mentioned high-temperature-resistant austenitic stainless steel seamless steel pipe includes the following steps: (a) hot-rolled piercing: place the tube blank at 1150-1160°C for 30-60 minutes, and control the compression ratio before plugging to 4.5-5.0 % perforation (the roll reduction used for perforation is 11~13%, and the control ellipticity is 1.07~1.10%. It should be noted that glass powder is preferably used for lubrication on the plug, so as to improve the quality of the inner hole of the steel pipe), and then immersed in water Cooling; (b) First pickling & inspection: pickle the steel pipe prepared in step (a) with a mixed solution of hydrofluoric acid and nitric acid, and then inspect the inner and outer surfaces respectively by endoscope and visual inspection. Carry out crack detection to confirm that there are no cracks on the inner and outer surfaces of the steel pipe; the pickling time is 1-3h, the mass concentration of t...

Embodiment 1

[0024] This embodiment provides a high-temperature-resistant austenitic stainless steel seamless steel pipe, and its element weight percentages are as follows C: 0.10%, Mn: 1.5%, Cu: 0.2%; Si: 1.70%, P: 0.035%, S: 0.005 %, Cr: 23%, Ni: 18%, and the balance is Fe; its preparation method comprises the following steps:

[0025] (a) Hot-rolled piercing: place the tube blank at 1150°C for 60 minutes, control the compression rate before the plug to 4.5% and piercing, then immerse in water to cool;

[0026] (b) The first pickling & inspection: Pickle the steel pipe prepared in step (a) with a mixed solution of hydrofluoric acid and nitric acid, and then crack the inner and outer surfaces respectively by endoscope and visual inspection. Detect to confirm that there are no cracks on the inner and outer surfaces of the steel pipe; the pickling time is 3h, the mass concentration of the hydrofluoric acid is 4%, and the mass concentration of the nitric acid is respectively 10%;

[0027] (...

Embodiment 2

[0033]This embodiment provides a high temperature resistant austenitic stainless steel seamless steel pipe, the weight percentage of its elements is as follows, C: 0.10%, Mn: 1.50%, Cu: 0.15%; Si: 2.10%, P: 0.030%, S: 0.004%, Cr: 26%, Ni: 22%, and the balance is Fe; its preparation method comprises the following steps:

[0034] (a) Hot-rolled piercing: firstly punch a centering hole on the end face of the tube billet (to facilitate centering when piercing), then place it in a heating furnace and heat it to 800°C at a speed of 8°C / min, and then heat it at a rate of 20°C / min Heating speed from 800°C to 1160°C, holding the heat for 30 minutes, controlling the compression ratio of 5.0% before piercing the plug, and then immersing in water to cool;

[0035] (b) The first pickling & inspection: Pickle the steel pipe prepared in step (a) with a mixed solution of hydrofluoric acid and nitric acid, and then crack the inner and outer surfaces respectively by endoscope and visual inspect...

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Abstract

The invention relates to a high-temperature resistant seamless austenitic stainless steel pipe and a preparation method thereof. The pipe comprises the following elements in percentage by weight: not more than 0.12% of C, not more than 1.5% of Mn, not more than 0.2% of Cu, 1.70 to 2.10% of Si, not more than 0.035% of P, not more than 0.005% of S, 23 to 26% of Cr, 18 to 22% of Ni, and the balance being Fe. The preparation method comprises the following steps: (a) hot rolling and punching; (b) first acid washing and inspection; (c) lubricating; (d) cold drawing and cold rolling; (e) second acid washing; (f) heat treatment; (g) third acid washing and inspection. The contents of chromium and nickel of the provided pipe are high, and the sizes of the chromium atom and nickel atom are different from that of iron atom, so the lattice is deformed by the chromium and nickel, at the same time the tissue is enhanced, and thus the steel pipe has a high recrystallization temperature. Furthermore, the silicon is added to properly enhance the mechanical performance and antioxidant property of steel.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a seamless steel pipe, in particular to a high-temperature-resistant austenitic stainless steel seamless steel pipe and a preparation method thereof. Background technique [0002] Due to the harsh working environment of thermal power units and blast furnaces in steel plants, ordinary steel pipes or ferrite alloys can no longer meet their use requirements, and new high-temperature resistant materials must be used. Among them, the materials used in boiler tubes, steelmaking furnaces, high-temperature furnaces and other components are among the parts with higher requirements. The basic requirements for high-temperature materials for boiler tubes of 700 ℃ ultra-supercritical thermal power units include: high-temperature durable creep performance, high-temperature resistance Corrosion performance, long-term tissue stability, steam oxidation resistance of the inner wall of the tu...

Claims

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Application Information

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IPC IPC(8): C22C38/42
Inventor 吴振环钱祥保金仁明刘凯
Owner SUZHOU GOLDEN WAY STEEL TUBE
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