GB 9948 Carbon Steel Seamless Steel Pipe For Petroleum Cracking
Introduction
The GB 9948 standard governs the manufacturing of carbon steel seamless steel pipes designed for use in petroleum cracking applications. These pipes play a critical role in the petrochemical industry, facilitating the transportation of fluids at high temperatures and pressures. In this article, we will delve into the material, specification, chemical composition, mechanical properties, steel grades, and applications of GB 9948 carbon steel seamless pipes.
Material and Specification
The GB 9948 standard specifies the requirements for seamless steel pipes made from carbon steel. These pipes are designed for use in high-temperature and high-pressure environments, such as in petroleum cracking processes. The material composition and manufacturing process are carefully controlled to ensure the pipes' reliability and durability.
| Property | Specification |
| Standard | GB 9948 |
| Material | Carbon Steel |
| Manufacturing | Seamless |
| Outer Diameter | 10.3mm - 1219mm |
| Wall Thickness | 2.0mm - 120mm |
Chemical Composition
The chemical composition of GB 9948 carbon steel seamless pipes is crucial in determining their performance and suitability for petroleum cracking applications. The following table outlines the typical chemical composition requirements:
| Element | Composition Range |
| Carbon (C) | 0.07% - 0.17% |
| Silicon (Si) | 0.17% - 0.37% |
| Manganese (Mn) | 0.40% - 0.70% |
| Phosphorus (P) | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% |
Mechanical Properties
The mechanical properties of GB 9948 carbon steel seamless pipes ensure their integrity under extreme conditions, making them suitable for petroleum cracking processes. These properties are critical for withstanding high temperatures and pressures.
| Property | Minimum Requirements |
| Tensile Strength | ≥ 410 MPa |
| Yield Strength | ≥ 245 MPa |
| Elongation | ≥ 25% |
| Impact Toughness | ≥ 34 J |
| Hardness (HB) | ≤ 179 |
Steel Grades
GB 9948 carbon steel seamless pipes are available in multiple steel grades, each designed for specific applications and conditions. The steel grades range from 10# to 45#, with varying mechanical properties to meet different requirements.
| Steel Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| 10# | ≥ 335 | ≥ 205 | ≥ 24 |
| 20# | ≥ 410 | ≥ 245 | ≥ 20 |
| 35# | ≥ 510 | ≥ 305 | ≥ 17 |
| 45# | ≥ 590 | ≥ 335 | ≥ 14 |
Application
GB 9948 carbon steel seamless pipes find widespread application in the petroleum industry, particularly in the process of petroleum cracking. Petroleum cracking involves the breaking down of larger hydrocarbon molecules into smaller, more valuable products, such as gasoline and other fuels. The high-temperature and high-pressure environment of petroleum cracking requires pipes that can withstand these extreme conditions while ensuring the efficient and safe transfer of fluids.
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