JIS G3473 Round Carbon Steel Tube
Material and Specification
JIS G3473 is a Japanese Industrial Standard that specifies the requirements for seamless carbon steel tubes used in automotive and mechanical applications. These tubes are Round Carbon Steel Tube suitable for use with cylinder pistons or other components where high precision and smoothness are essential.
The standard covers several grades of seamless carbon steel tubes, each designed for specific applications and mechanical properties. The main grades specified in JIS G3473 are as follows:
| Steel Grade | Chemical Composition |
| STC 370 | C: 0.27-0.34% |
| Si: 0.15-0.35% | |
| Mn: 0.30-0.90% | |
| P: 0.030% max | |
| S: 0.030% max | |
| STC 440A | C: 0.37-0.44% |
| Si: 0.15-0.35% | |
| Mn: 0.30-0.90% | |
| P: 0.030% max | |
| S: 0.030% max | |
| STC 440B | C: 0.37-0.44% |
| Si: 0.15-0.35% | |
| Mn: 0.60-1.00% | |
| P: 0.030% max | |
| S: 0.030% max |
Mechanical Properties
The mechanical properties of the seamless carbon steel tubes are essential to ensure their suitability for the intended applications. The following table provides an overview of the mechanical properties for each steel grade:
| Steel Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) |
| STC 370 | 370 min | 215 min | 30 min | 65 max |
| STC 440A | 440 min | 305 min | 20 min | 85 max |
| STC 440B | 440 min | 305 min | 20 min |
85 max |
Application
JIS G3473 seamless carbon steel tubes find widespread applications in the automotive industry, especially in the manufacturing of hydraulic cylinders and pneumatic cylinders. These tubes are also utilized in various mechanical and engineering applications that demand high precision, excellent surface finish, and reliable performance.
The seamless design of these carbon steel tubes allows for smoother internal surfaces, reducing friction and enhancing overall efficiency in fluid transportation and mechanical operations.
The precise specifications and mechanical properties of JIS G3473 tubes make them a preferred choice for critical components that require resistance to deformation, toughness, and durability.
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