Description
JIS G3446 SUS303TKA SUS304TKA SUS304LTKA SUS316TKA Stainless Steel Structural Tube
Introduction
JIS G3446 is a Japanese Industrial Standard that specifies the requirements for stainless steel structural tube. This standard includes various grades such as SUS303TKA, SUS304TKA, SUS304LTKA, and SUS316TKA, each with unique properties and applications. This article will delve into the material specifications, key features, chemical compositions, mechanical properties, applications, and possible alternative grades of these stainless steel tubes.
Material Specification
The stainless steel structural tube covered under JIS G3446 are designed for various structural applications, offering excellent corrosion resistance, strength, and durability.
Key Features
- Corrosion Resistance: High resistance to oxidation and corrosion.
- Strength: Excellent mechanical properties, making them suitable for structural applications.
- Weldability: Good weldability, allowing for easy fabrication.
- Aesthetic Appeal: Smooth surface finish and aesthetic appearance.
Chemical Composition
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| SUS303TKA | 0.15 | 1.00 | 2.00 | 0.045 | 0.030 | 17.00 | 8.00 | – |
| SUS304TKA | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 18.00 | 8.00 | – |
| SUS304LTKA | 0.03 | 1.00 | 2.00 | 0.045 | 0.030 | 18.00 | 8.00 | – |
| SUS316TKA | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 16.00 | 10.00 | 2.00 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| SUS303TKA | 205 | 515 | 40 | 90 |
| SUS304TKA | 215 | 505 | 40 | 92 |
| SUS304LTKA | 215 | 505 | 50 | 92 |
| SUS316TKA | 290 | 580 | 40 | 95 |
Steel Grade
The steel grades specified in JIS G3446 are designed to meet various structural requirements while providing excellent corrosion resistance and mechanical properties.
Application
The stainless steel structural tubes are widely used in various industries, including:
- Construction: Structural components in buildings and bridges.
- Automotive: Exhaust systems and structural parts.
- Marine: Components exposed to seawater and harsh environments.
- Food Processing: Equipment and piping systems due to their hygienic properties.
Possible Alternative Grades
While SUS303TKA, SUS304TKA, SUS304LTKA, and SUS316TKA are commonly used, alternative grades may include:
- SUS201: A lower-cost alternative with moderate corrosion resistance.
- SUS316L: A low carbon version of SUS316, offering improved weldability.
- SUS310: High-temperature applications due to superior oxidation resistance.
