JIS G3456 Hot Rolled Seamless Steel Tube Carbon Steel Pipe For High Temperature Service
Introduction
The JIS G3456 standard covers hot rolled seamless carbon steel tubes for high-temperature service. This specification specifies the material, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades for this type of steel tube.
Material and Specification
According to JIS G3456, the material used for hot rolled seamless steel tubes is carbon steel. The specification outlines the following requirements for these tubes:
- Outer diameter: 15.9mm - 139.8mm
- Wall thickness: 1.6mm - 12.7mm
- Length: 5m - 12m
- Pipe appearance: The tube's surface should be free of defects that are detrimental to practical use. However, slight oxidation and superficial scratches are permitted.
Key Features
The key features of JIS G3456 hot rolled seamless steel tubes include:
- High-temperature resistance: These tubes are designed to withstand high temperatures, making them suitable for applications where elevated temperatures are encountered.
- Seamless construction: The seamless design ensures the absence of welds or joints, leading to improved strength and integrity.
- Precision dimensions: The strict manufacturing standards ensure precise dimensions, which are crucial for reliable performance and compatibility in various applications.
- Corrosion resistance: Carbon steel used in these tubes provides good resistance to corrosion, enhancing the durability and longevity of the product.
Chemical Composition
| Element | Composition (% by Mass) |
| Carbon | 0.08 - 0.13 |
| Silicon | 0.10 - 0.35 |
| Manganese | 0.30 - 0.60 |
| Phosphorus | 0.035 (max) |
| Sulfur | 0.035 (max) |
Mechanical Properties
| Property | Value |
| Tensile Strength | 390 MPa (min) |
| Yield Strength | 215 MPa (min) |
| Elongation | 30% (min) |
| Hardness (HB) | 114 HB (max) |
| Impact Strength | No Break (min) |
Steel Grade
The steel grade specified in JIS G3456 for hot rolled seamless steel tubes is STPT370.
Application
JIS G3456 hot rolled seamless steel tubes find applications in various industries where high-temperature resistance is required. Some common applications include:
- Power plants: These tubes are extensively used in the construction of boilers, superheaters, and heat exchangers.
- Petrochemical industry: They are employed in the manufacturing of high-temperature pipes and equipment used in the processing of petroleum and natural gas.
- Refineries: JIS G3456 tubes are utilized in the construction of refining furnaces and other equipment where high-temperature resistance is necessary.
Possible Alternative Grades
While the STPT370 grade specified in JIS G3456 is the standard grade, several alternative grades can be considered based on specific requirements. Some possible alternative grades include STPT410, STPT480, and STPT510, which provide higher strength and temperature resistance, depending on the application.
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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.
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