GB 9948 Carbon Steel Tube Hot Rolled Carbon Steel Seamless Steel Pipe For Petroleum Cracking
GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo Carbon Steel Tube: Hot Rolled Carbon Steel Seamless Steel Pipe For Petroleum Cracking
Introduction
The GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo carbon steel tube is a hot rolled carbon steel seamless steel pipe specifically designed for petroleum cracking applications. This article will provide an overview of the material, specification, key features, chemical composition, mechanical properties, steel grade, application, and possible alternative grades.
Material and Specification
The GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo carbon steel tube is manufactured according to the GB 9948 standard. It is made from carbon steel and is produced using a hot rolling process. The seamless steel pipe is designed for use in petroleum cracking, which involves the thermal cracking of hydrocarbon compounds to produce lighter fractions such as gasoline, diesel, and jet fuel.
Key Features
The key features of the GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo carbon steel tube include:
- High strength: The carbon steel tube exhibits excellent strength properties, making it suitable for applications in high-pressure environments.
- Good weldability: The seamless steel pipe can be easily welded using conventional welding techniques, ensuring ease of installation and maintenance.
- Corrosion resistance: The carbon steel tube is resistant to corrosion, which is crucial for applications in the petroleum industry where exposure to corrosive substances is common.
- Heat resistance: The seamless steel pipe can withstand high temperatures, making it suitable for use in petroleum cracking processes that involve elevated temperatures.
Chemical Composition
| Element | 10 | 20 | 12CrMo | 15CrMo | 12Cr1Mo |
|---|---|---|---|---|---|
| Carbon (C) | 0.07-0.14 | 0.17-0.24 | 0.08-0.15 | 0.12-0.18 | 0.10-0.15 |
| Silicon (Si) | 0.17-0.37 | 0.17-0.37 | 0.17-0.37 | 0.17-0.37 | 0.17-0.37 |
| Manganese (Mn) | 0.35-0.65 | 0.35-0.65 | 0.40-0.70 | 0.40-0.70 | 0.40-0.70 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| Chromium (Cr) | - | - | 0.90-1.20 | 0.80-1.10 | 0.90-1.20 |
| Molybdenum (Mo) | - | - | 0.15-0.30 | 0.25-0.35 | 0.15-0.30 |
Mechanical Properties
| Property | 10 | 20 | 12CrMo | 15CrMo | 12Cr1Mo |
|---|---|---|---|---|---|
| Tensile Strength | ≥ 335 MPa | ≥ 410 MPa | ≥ 410 MPa | ≥ 440 MPa | ≥ 440 MPa |
| Yield Strength | ≥ 205 MPa | ≥ 245 MPa | ≥ 205 MPa | ≥ 295 MPa | ≥ 295 MPa |
| Elongation | ≥ 24% | ≥ 24% | ≥ 22% | ≥ 20% | ≥ 20% |
| Hardness (HB) | ≤ 179 | ≤ 179 | ≤ 179 | ≤ 179 | ≤ 179 |
Steel Grade
The GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo carbon steel tube falls under the following steel grades:
- 10: This grade has a carbon content ranging from 0.07% to 0.14% and is suitable for general applications.
- 20: With a carbon content ranging from 0.17% to 0.24%, this grade offers improved strength compared to grade 10.
- 12CrMo: This grade contains chromium and molybdenum, providing enhanced heat resistance and corrosion resistance.
- 15CrMo: Similar to 12CrMo, this grade also contains chromium and molybdenum, offering excellent high-temperature strength and oxidation resistance.
- 12Cr1Mo: This grade contains higher chromium content, providing improved corrosion resistance and high-temperature strength.
Application
The GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo carbon steel tube is primarily used in petroleum cracking applications. It is suitable for the transportation of various hydrocarbon compounds, including gasoline, diesel, and jet fuel. The seamless steel pipe is designed to withstand high temperatures and pressures, making it an essential component in the petroleum industry.
Possible Alternative Grades
In addition to the GB 9948 10 20 12CrMo 15CrMo 12Cr1Mo carbon steel tube, there are several alternative grades available for petroleum cracking applications. These include:
- ASTM A335 P11: This grade is widely used in power plants and refineries due to its excellent high-temperature strength and corrosion resistance.
- ASTM A335 P22: Similar to P11, this grade offers enhanced strength and oxidation resistance, making it suitable for high-temperature applications.
- ASTM A335 P91: With higher chromium and molybdenum content, this grade provides superior corrosion resistance and high-temperature strength.
These alternative grades can be considered based on specific application requirements and compatibility with existing systems.
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