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Corrosion-resistance seamless stainless steel pipe and preparation method thereof

A stainless steel tube, stainless steel technology, applied in the field of austenitic stainless steel, can solve the problem of low corrosion resistance, achieve the effect of improving strength, eliminating component segregation, and improving stress corrosion resistance

Inactive Publication Date: 2017-01-04
ZHEJIANG HENGYUAN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an ultra-low carbon austenitic stainless steel, which solves the problem of relatively low corrosion resistance of the existing austenitic stainless steel

Method used

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  • Corrosion-resistance seamless stainless steel pipe and preparation method thereof
  • Corrosion-resistance seamless stainless steel pipe and preparation method thereof
  • Corrosion-resistance seamless stainless steel pipe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In this embodiment, an ultra-low carbon austenitic stainless steel has a chemical composition in terms of mass percentage: 0.017% carbon, 0.2% nitrogen, 1.75% manganese, 19.4% chromium, 10.6% nickel, 0.39% silicon, and 1.62% aluminum , tantalum 2.01%, vanadium 0.64%, hafnium 2.13%, titanium 0.69%, cobalt 0.28%, tungsten 3.04%, molybdenum 1.86%, selenium 0.61%, and the balance is iron.

Embodiment 2～5

[0066] The chemical composition of the ultra-low carbon austenitic stainless steel in Examples 2-5 is shown in Table 1 in terms of mass percentage.

[0067] The chemical composition table of the ultra-low carbon austenitic stainless steel of table 1 embodiment 2~5

[0068]

[0069]

Embodiment 6

[0077] Utilizing the austenitic stainless steel materials of Examples 1-5 and Comparative Examples 1-19 respectively to prepare corrosion-resistant seamless stainless steel pipes, comprising the following steps:

[0078] (1) primary refining

[0079] ①: According to the preset mass percentage, put manganese, nickel, chromium, molybdenum, selenium, aluminum and iron in an electric furnace or a converter, and smelt at 1350-1420°C until all components are completely melted to obtain smelting liquid A;

[0080] ②: Put tantalum, hafnium, tungsten, titanium, vanadium and cobalt in an electric furnace or a converter according to the preset mass percentage, and smelt at 1480-1620°C until all components are completely melted to obtain smelting solution B;

[0081] ③: Raise the temperature of smelting liquid B to 1550-1750°C, and add carbon, nitrogen and silicon to smelting liquid B according to the preset mass percentage, and continue smelting for 3 to 4 hours to obtain smelting liquid...

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Abstract

The invention discloses a corrosion-resistance seamless stainless steel pipe and a preparation method thereof. The corrosion-resistance seamless stainless steel pipe comprises the following chemical components in percentage by mass: carbon not more than 0.02%, 0.1-0.25% of nitrogen, 1.6-1.8% of manganese, 18-20% of chromium, 9-11% of nickel, 0.3-0.5% of silicon, 1.5-1.7% of aluminum, 1.5-2.3% of tantalum, 0.3-0.8% of vanadium, 1.2-2.6% of hafnium, 0.5-0.8% of titanium, 0.2-0.4% of cobalt, 1.6-3.4% of tungsten, 1-3% of molybdenum, 0.4-0.7% of selenium, and the balance of iron. Tantalum, hafnium and tungsten are added in austenitic stainless steel, and the chemical components can improve the performances of corrosion resistance, hardness, strength and high-temperature resistance of the austenitic stainless steel, so that the austenitic stainless steel is rich in high ductility and toughness.

Description

technical field [0001] The invention relates to an austenitic stainless steel, in particular to a corrosion-resistant seamless stainless steel pipe and a preparation method thereof. Background technique [0002] The seamless steel pipes used in the preparation of pipelines should be made of stainless steel, but there are too few stainless steel materials with high strength, high toughness and excellent corrosion resistance. Traditional ordinary carbon steel and low-Cr alloy steel are difficult to meet the requirements. [0003] At present, martensitic stainless steel and austenitic-ferritic duplex stainless steel are usually used to prepare high-strength seamless steel pipes. Among them, martensitic stainless steel has higher strength, hardness and wear resistance due to its higher carbon content, but Its corrosion resistance is slightly poor, and it is mainly used to prepare parts with high mechanical performance requirements and general corrosion resistance performance req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/06C22C38/48C22C38/46C22C38/50C22C38/52C22C38/44C22C38/60C21D9/08C21D1/30C21D7/12C21D1/26B21C37/06
CPCB21C37/06C21D1/26C21D1/30C21D7/12C21D9/08C21D2211/001C22C38/001C22C38/02C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/58C22C38/60
Inventor 吴显玉
Owner ZHEJIANG HENGYUAN STEEL CO LTD
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