Corrosion-resistance seamless stainless steel pipe and preparation method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF4 Cites 15 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more