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Address: Suite 1004, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
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The GB/T 30070 standard covers the requirements for seamless alloy steel pipes specifically designed for use in seawater service. The seamless steel tubes produced according to this standard provide superior corrosion resistance, making them suitable for various marine applications.
The material used for manufacturing these seamless tubes is alloy steel, which offers enhanced strength and resistance to corrosion caused by seawater. The seamless construction ensures the absence of any welded joints, which further enhances the corrosion resistance and integrity of the pipes.
The GB/T 30070 standard for seamless alloy steel pipes used in seawater service provides several key features that render them ideal for marine applications:
Corrosion Resistance: These seamless alloy steel pipes are specifically designed and manufactured to withstand the corrosive effects of seawater, ensuring a long service life.
High Strength: The alloy steel material used to produce these pipes provides excellent mechanical properties, offering high strength and durability even in demanding marine environments.
Seamless Construction: The seamless design eliminates any weaknesses and vulnerabilities associated with welded joints, ensuring a reliable and leak-free performance.
Wide Range of Applications: The seamless alloy steel pipes conforming to GB/T 30070 are suitable for various seawater service applications, including offshore oil and gas platforms, shipbuilding, and marine engineering projects.
The following table presents the chemical composition requirements for seamless alloy steel pipes manufactured according to the GB/T 30070 standard:
| Steel Grade | Chemical Composition (%) |
|---|---|
| Grade 1 | C ≤ 0.18, Si ≤ 0.18, Mn ≤ 0.90, P ≤ 0.025, S ≤ 0.015, Cr ≤ 0.50, Ni ≤ 0.50, Mo ≤ 0.30 |
| Grade 2 | C ≤ 0.18, Si ≤ 0.18, Mn ≤ 0.90, P ≤ 0.025, S ≤ 0.015, Cr ≤ 0.80, Ni ≤ 1.00, Mo ≤ 0.85 |
| Grade 3 | C ≤ 0.18, Si ≤ 0.18, Mn ≤ 0.90, P ≤ 0.025, S ≤ 0.015, Cr ≤ 1.50, Ni ≤ 2.00, Mo ≤ 1.00 |
| Grade 4 | C ≤ 0.18, Si ≤ 0.18, Mn ≤ 0.90, P ≤ 0.025, S ≤ 0.015, Cr ≤ 2.50, Ni ≤ 3.50, Mo ≤ 1.50 |
Note: The above values are maximum limits unless otherwise specified.
The mechanical properties for seamless alloy steel pipes conforming to GB/T 30070 are specified as follows:
| Steel Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Grade 1 | ≥ 430 | ≥ 255 | ≥ 22 |
| Grade 2 | ≥ 510 | ≥ 345 | ≥ 20 |
| Grade 3 | ≥ 690 | ≥ 500 | ≥ 20 |
| Grade 4 | ≥ 865 | ≥ 690 | ≥ 15 |
The GB/T 30070 standard specifies four different steel grades for seamless alloy steel pipes used in seawater service. Each grade has a distinct chemical composition and mechanical properties, allowing for suitability in various applications.
The seamless alloy steel pipes produced under this standard are commonly used in the following applications:
While the GB/T 30070 standard provides specific steel grades for seamless alloy steel pipes used in seawater service, there may be alternative grades available in certain cases. These alternative grades could come from other international standards or proprietary materials developed for similar 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.
