GB 5310 20G Hot Rolled Seamless Steel Tubes And Pipes For High Pressure Boilers
GB 5310 is a Chinese standard that specifies the seamless steel tubes and pipes for high-pressure boilers. The material used in GB 5310 is 20G, which is a high-quality carbon structural steel. This article will discuss the material, specification, chemical composition, mechanical properties, steel grade, and application of GB 5310 20G hot rolled seamless steel tubes and pipes for high-pressure boilers.
Material
GB 5310 20G seamless steel tubes and pipes are made of 20G, which is a high-quality carbon structural steel.
Specification
The specification of GB 5310 20G seamless steel tubes and pipes is as follows:
- Outer diameter: 6-168mm
- Wall thickness: 1-15mm
- Length: 5-12m
Chemical Composition
The chemical composition of GB 5310 20G seamless steel tubes and pipes is as follows:
| Element | Composition (%) |
| C | 0.17-0.24 |
| Si | 0.17-0.37 |
| Mn | 0.40-0.70 |
| P | 0.035 max |
| S | 0.035 max |
Mechanical Properties
The mechanical properties of GB 5310 20G seamless steel tubes and pipes are as follows:
| Property | Value |
| Tensile strength | 410-550 MPa |
| Yield strength | 245 MPa min |
| Elongation at break | 24% min |
| Hardness (HB) | 137 max |
| Impact energy (J) | 39 min |
Steel Grade
The steel grade of GB 5310 20G seamless steel tubes and pipes is 20G.
Application
GB 5310 20G seamless steel tubes and pipes are used in high-pressure boilers. They are widely used in the construction of power plants, boilers, and high-pressure pipelines. The tubes and pipes are also used in the transportation of high-temperature fluids such as steam and water.
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