GB/T 30070 Seamless Steel Tube Seamless Alloy Steel Pipes For Seawater Service
Material and Specification
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.
Key Features
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:
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Corrosion Resistance: These seamless alloy steel pipes are specifically designed and manufactured to withstand the corrosive effects of seawater, ensuring a long service life.
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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.
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Seamless Construction: The seamless design eliminates any weaknesses and vulnerabilities associated with welded joints, ensuring a reliable and leak-free performance.
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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.
Chemical Composition
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.
Mechanical Properties
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 |
Steel Grade and Application
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:
- Offshore oil and gas platforms
- Shipbuilding industry
- Marine engineering projects
- Seawater desalination plants
- Coastal construction and infrastructure
Possible Alternative Grades
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.
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