GB/T 32970 Longitudinal Submerged Arc Welded Steel Pipe For High Pressure Service At High Temperatures
GB/T 32970 Longitudinal Submerged-Arc Welded Steel Pipe For High Pressure Service At High Temperatures
Material
The material used in GB/T 32970 longitudinal submerged-arc welded steel pipes for high pressure service at high temperatures is carbon steel.
Specification
The specification of GB/T 32970 includes the following parameters:
- Outer diameter range: 219-2820mm
- Wall thickness range: 6-30mm
- Length: 6-12 meters
- Pipe end: Bevel end, plain end, or threaded end
Key Features
GB/T 32970 longitudinal submerged-arc welded steel pipes for high pressure service at high temperatures exhibit the following key features:
- High strength: These pipes have high tensile strength, which ensures their suitability for high-pressure applications.
- Excellent heat resistance: Designed to withstand high temperatures, these pipes offer reliable performance in environments with elevated heat.
- Good weldability: The steel used in these pipes exhibits excellent weldability, allowing for easy and secure joining processes.
Chemical Composition
The chemical composition of GB/T 32970 longitudinal submerged-arc welded steel pipes for high pressure service at high temperatures is as follows:
| Element | Composition Range |
|---|---|
| Carbon | 0.20% max |
| Silicon | 0.15-0.55% |
| Manganese | 1.00-1.80% |
| Phosphorus | 0.030% max |
| Sulfur | 0.020% max |
| Copper | 0.25% max |
| Chromium | 0.30% max |
| Nickel | 0.30% max |
| Molybdenum | 0.10% max |
| Vanadium | 0.10% max |
Mechanical Properties
GB/T 32970 longitudinal submerged-arc welded steel pipes for high pressure service at high temperatures possess the following mechanical properties:
| Property | Minimum Value |
|---|---|
| Tensile Strength | 610 MPa |
| Yield Strength | 345 MPa |
| Elongation | 22% |
| Impact Toughness | 27 J |
| Hardness | 200 HB |
| Charpy V-notch Impact Test | -20°C |
Steel Grade
Steel grade used in GB/T 32970 longitudinal submerged-arc welded steel pipes for high pressure service at high temperatures is Q245R.
Application
GB/T 32970 longitudinal submerged-arc welded steel pipes find application in various industries that demand high-pressure and high-temperature service conditions. Some common applications include:
- Oil and gas transportation
- Petrochemical industries
- Power plants
- Boiler systems
Possible Alternative Grades
In addition to the specified Q245R grade, there are several possible alternative grades that can be used in similar applications:
- Q345R
- Q370R
- 16MnDR
- 15CrMoR
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