GB/T 31940 Bi-metal Composite Corrosion Resistance Steel Pipe for Fluid Transportation
Introduction
The GB/T 31940 standard defines the requirements for bi-metal composite corrosion resistance steel pipe, specifically designed for fluid transportation applications. This article provides an overview of the material, specification, key features, chemical composition, mechanical properties, steel grade, application, and possible alternative grades of this innovative steel pipe.
Material and Specification
| Material | Bi-metal composite corrosion resistance steel |
| Specification | GB/T 31940 |
Key Features
- Corrosion resistance
- Durability
- High strength
- Enhanced fluid flow
- Long service life
- Cost-effective
Chemical Composition
The chemical composition of GB/T 31940 bi-metal composite corrosion resistance steel pipe is detailed in the table below:
| Element | Chemical Composition (%) |
| Carbon (C) | 0.05 - 0.12 |
| Manganese (Mn) | 0.30 - 0.60 |
| Silicon (Si) | 0.20 - 0.50 |
| Chromium (Cr) | 0.50 - 1.00 |
| Nickel (Ni) | 1.50 - 2.50 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
Mechanical Properties
The mechanical properties of GB/T 31940 bi-metal composite corrosion resistance steel pipe are as follows:
| Property | Value |
| Tensile Strength (MPa) | ≥ 560 |
| Yield Strength (MPa) | ≥ 390 |
| Elongation (%) | ≥ 22 |
| Impact Toughness (J/cm²) | ≥ 45 |
| Hardness (HB) | ≤ 250 |
Steel Grade and Application
The GB/T 31940 standard specifies different steel grades for bi-metal composite corrosion resistance steel pipes. These grades are suitable for various fluid transportation applications, including but not limited to:
- Oil and gas industry
- Water treatment plants
- Chemical processing plants
- Power generation facilities
Possible Alternative Grades
While GB/T 31940 bi-metal composite corrosion resistance steel pipe is a highly specialized material, there are some possible alternative grades that may be considered for specific applications. These include:
- Stainless Steel: Offers excellent corrosion resistance, but may be more expensive.
- Polymer-Coated Steel: Provides corrosion protection with a lightweight and flexible solution, suitable for certain application conditions.
- Fiberglass-Reinforced Plastic (FRP): Offers exceptional corrosion resistance with excellent strength-to-weight ratio, commonly used in the chemical industry.
It is important to carefully evaluate the specific requirements of each application before selecting an alternative grade to ensure compatibility and optimum performance.
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