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GB/T 21833 is the Chinese national standard that specifies the requirements for austenitic ferritic duplex grade stainless steel seamless tubes and pipes for general-purpose applications. This standard ensures that the material meets specific quality and performance criteria. This article provides essential information about the material, its specifications, key features, chemical composition, mechanical properties, steel grade, application, and possible alternative grades.
The material covered by GB/T 21833 is austenitic ferritic duplex grade stainless steel. This type of stainless steel combines the characteristics of both austenitic and ferritic stainless steels, offering exceptional corrosion resistance and high strength. It possesses good weldability and formability, making it suitable for various applications.
GB/T 21833 specifies the requirements for seamless tubes and pipes made from austenitic ferritic duplex grade stainless steel. The standard covers dimensions, tolerances, testing methods, and other technical specifications necessary for ensuring the quality and reliability of the material.
Austenitic ferritic duplex grade stainless steel seamless tubes and pipes possess several key features, including:
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Chromium (Cr) | 18.0 | 23.0 |
| Nickel (Ni) | 3.0 | 8.0 |
| Molybdenum (Mo) | 0.10 | 3.0 |
| Nitrogen (N) | 0.10 | 0.30 |
| Manganese (Mn) | - | 2.0 |
| Silicon (Si) | - | 1.0 |
| Copper (Cu) | - | 1.0 |
| Phosphorus (P) | - | 0.035 |
| Sulfur (S) | - | 0.015 |
| Property | Minimum Value | Maximum Value |
|---|---|---|
| Tensile Strength (MPa) | 620 | 880 |
| Yield Strength (MPa) | 450 | 640 |
| Elongation (%) | 25 | 35 |
| Hardness (HB) | - | 290 |
GB/T 21833 provides several steel grades for austenitic ferritic duplex stainless steel seamless tubes and pipes, including:
Austenitic ferritic duplex grade stainless steel seamless tubes and pipes specified by GB/T 21833 find widespread application in various industries. Some common usage areas include:
While GB/T 21833 specifies specific grades, there are alternative stainless steel grades available for similar applications. Some possible alternative grades to austenitic ferritic duplex stainless steel include:
It's important to consider specific requirements and consult with material experts when selecting alternative grades for particular applications.
Haiyan Sanxin Steel Pipe Factory is a leading manufacturer of steel pipes in China. Located in a region with excellent geographical advantages, the factory is situated close to the Zhoushan Port and Ningbo Port.
Our factory covers an area of more than 25,000 square meters and has been in the steel pipe manufacturing business for 20 years. Over this period, we have accumulated a wealth of professional experience, which has helped us establish ourselves as a trusted name in the industry.
At our factory, we specialize in the production of various types of steel pipes, including stainless steel pipe, carbon steel pipe, copper pipe, steel pipe,seamless steel pipe and welded pipe. Our expertise in this field is evident from the 12 patents that we hold, which demonstrate our commitment to innovation and excellence.
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.