GB/T 12770 S30210 Welded Stainless Steel Tubes For Mechanical Structures
GB/T 12770 S30210 S30408 S30403 S31008 S31608 Welded Steel Tube Stainless Steel Tubes For Mechanical Structures
Material
The GB/T 12770 standard specifies the requirements for welded stainless steel tubes used in mechanical structures. These tubes are manufactured from various stainless steel grades, each offering unique properties suitable for different applications.
Specification
The specification outlines the dimensions, tolerances, and mechanical properties of the welded stainless steel tubes. The tubes are typically produced in various diameters and wall thicknesses to meet specific engineering requirements.
Key Features
- Corrosion Resistance: Excellent resistance to oxidation and corrosion.
- High Strength: Suitable for high-stress applications.
- Weldability: Designed for easy welding without compromising structural integrity.
- Versatility: Applicable in various industries, including construction, automotive, and manufacturing.
Chemical Composition
| Steel Grade | C (%) | Cr (%) | Ni (%) | Mo (%) | Mn (%) | Si (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|---|---|
| S30210 | 0.08 | 17.0-19.0 | 8.0-10.0 | - | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| S30408 | 0.08 | 18.0-20.0 | 8.0-10.5 | - | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| S30403 | 0.03 | 18.0-20.0 | 8.0-10.5 | - | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| S31008 | 0.08 | 24.0-26.0 | 19.0-22.0 | 0.5-1.5 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| S31608 | 0.08 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
Mechanical Properties
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| S30210 | ≥ 205 | ≥ 515 | ≥ 40 | ≤ 187 |
| S30408 | ≥ 205 | ≥ 515 | ≥ 40 | ≤ 187 |
| S30403 | ≥ 205 | ≥ 515 | ≥ 40 | ≤ 187 |
| S31008 | ≥ 205 | ≥ 515 | ≥ 40 | ≤ 187 |
| S31608 | ≥ 205 | ≥ 515 | ≥ 40 | ≤ 187 |
Steel Grade
The steel grades specified in the GB/T 12770 standard include:
- S30210
- S30408
- S30403
- S31008
- S31608
Each grade is designed for specific mechanical properties and corrosion resistance, making them suitable for various applications.
Application
Welded stainless steel tubes are widely used in:
- Construction: Structural components, handrails, and supports.
- Automotive: Exhaust systems, frames, and chassis.
- Manufacturing: Machinery, equipment, and piping systems.
- Marine: Boat fittings and components exposed to seawater.
Possible Alternative Grades
In addition to the specified grades, alternative stainless steel grades may be considered based on specific requirements:
- S32100: Offers improved resistance to high-temperature oxidation.
- S34700: Provides better resistance to intergranular corrosion.
- S316L: A low carbon version of S31608, suitable for welding applications.
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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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