High temperature and corrosion resistant seamless stainless steel pipe and preparation method of the seamless stainless steel pipe

A stainless steel tube, stainless steel technology, applied in the preparation of seamless stainless steel tube, ultra-low carbon austenitic stainless steel field, can solve the problem of low corrosion resistance, improve corrosion resistance, improve stress corrosion resistance, improve Effect of Intergranular Corrosion Resistance

Active Publication Date: 2018-09-14
隆达钢业集团有限公司
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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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  • High temperature and corrosion resistant seamless stainless steel pipe and preparation method of the seamless stainless steel pipe
  • High temperature and corrosion resistant seamless stainless steel pipe and preparation method of the seamless stainless steel pipe
  • High temperature and corrosion resistant seamless stainless steel pipe and preparation method of the seamless stainless steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, an ultra-low carbon austenitic stainless steel has a chemical composition in terms of mass percentage: 0.016% carbon, 0.21% nitrogen, 1.83% manganese, 19.1% chromium, 11.7% nickel, 0.32% silicon, and 1.68% aluminum , tantalum 1.94%, niobium 0.92%, hafnium 2.67%, cobalt 0.21%, tungsten 2.12%, molybdenum 2.15%, tellurium 0.52%, and the balance is iron.

Embodiment 2～5

[0065] 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.

[0066] The chemical composition table of the ultra-low carbon austenitic stainless steel of table 1 embodiment 2~5

[0067] ingredients

Embodiment 6

[0073] Using the austenitic stainless steel materials of Examples 1-5 and Comparative Examples 1-13 to prepare high-temperature-resistant and corrosion-resistant seamless stainless steel pipes, the steps include the following steps:

[0074] (1) primary refining

[0075] ①: According to the preset mass percentage, put manganese, nickel, chromium, molybdenum, tellurium, aluminum and iron in an electric furnace or a converter, and smelt at 1350-1400°C until all components are completely melted to obtain smelting solution A;

[0076] ②: Put tantalum, hafnium, tungsten, niobium and cobalt in an electric furnace or a converter according to the preset mass percentage, and smelt them at 1500-1600°C until all components are completely melted to obtain smelting liquid B;

[0077] 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...

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Abstract

The invention discloses an ultra-low-carbon austenitic stainless steel and high-temperature-resistant corrosion-resistant seamless stainless steel pipe and a preparation method thereof. The high-temperature-resistant corrosion-resistant seamless stainless steel pipe is made of ultra-low-carbon austenitic stainless steel which comprises chemical components: by mass, less than or equal to 0.02% of carbon, 0.1-0.3% of nitrogen, 1.7-1.9% of manganese, 18-20% of chrome, 10-13% of nickel, 0.2-0.4% of silicon, 1.4-1.8% of aluminum, 0.8-2.3% of tantalum, 0.5-1.4% of niobium, 1.5-3.2% of hafnium, 0.1-0.3% of cobalt, 1-3% of tungsten, 1-3% of molybdenum, 0.3-0.6% of tellurium, and the balance iron. Tantalum, hafnium and tungsten are added to the austenitic stainless steel. The chemical components can improve the corrosion resistance, hardness, strength and high temperature resistance of the austenitic stainless steel, and accordingly the austenitic stainless steel has high malleability and toughness.

Description

technical field [0001] The invention relates to an austenitic stainless steel, in particular to an ultra-low carbon austenitic stainless steel, a high-temperature-resistant and corrosion-resistant seamless stainless steel pipe and a preparation method of the seamless stainless steel pipe. 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 stainless steel pipes. Among them, martensitic stainless steel has high strength, hardness and wear resistance due to its high carbon content. However, its corrosion resistance is slightly poor, and it is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/06C22C38/48C22C38/52C22C38/44C22C38/60C21D8/10
CPCC21D8/105C22C38/001C22C38/002C22C38/02C22C38/06C22C38/44C22C38/48C22C38/52C22C38/58C22C38/60
Inventor 项军炎
Owner 隆达钢业集团有限公司
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