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ASTM B167 Inconel 600 625 Seamless Pipe
Introduction
ASTM B167 covers the specification for seamless pipes made from Inconel 600 and Inconel 625 alloys. These nickel-chromium-based superalloys exhibit excellent corrosion resistance, high strength, and good weldability, making them suitable for various applications in extreme environments. This article provides an overview of the material, specification, chemical composition, mechanical properties, steel grade, and application of ASTM B167 Inconel 600 and Inconel 625 seamless pipes.
Material And Specification
ASTM B167 specifies the requirements for seamless pipes made from the following alloys:
- Inconel 600: This alloy is composed of nickel, chromium, and iron, with small amounts of other elements such as copper and manganese.
- Inconel 625: This alloy contains nickel, chromium, and molybdenum, with smaller additions of niobium, iron, and other elements.
The specifications for ASTM B167 Inconel 600 and Inconel 625 seamless pipes are as follows:
| Property | ASTM B167 Inconel 600 | ASTM B167 Inconel 625 |
|---|---|---|
| Standard | ASTM B167 | ASTM B167 |
| Size Range | 1/8" to 4" (10.3mm to 114.3mm) | 1/8" to 4" (10.3mm to 114.3mm) |
| Wall Thickness | Schedule 5S to Schedule XXS | Schedule 5S to Schedule XXS |
| Length | Up to 6 meters | Up to 6 meters |
| End Types | Plain End, Beveled End, Threaded | Plain End, Beveled End, Threaded |
| Heat Treatment | Solution Annealed and Pickled | Solution Annealed and Pickled |
| Surface Finish | Annealed and Pickled, Mill Finish | Annealed and Pickled, Mill Finish |
Chemical Composition
The chemical composition of ASTM B167 Inconel 600 and Inconel 625 seamless pipes is as follows:
| Element | Composition (Inconel 600) | Composition (Inconel 625) |
|---|---|---|
| Nickel | 72.0% min | 58.0% min |
| Chromium | 14.0-17.0% | 20.0-23.0% |
| Iron | 6.0-10.0% | 5.0 min |
| Molybdenum | - | 8.0-10.0% |
| Niobium | - | 3.15-4.15% |
| Copper | 0.5% max | - |
| Manganese | 1.0% max | 0.50 max |
| Silicon | 0.5% max | 0.50 max |
| Carbon | 0.15% max | 0.10 max |
| Sulfur | 0.015% max | 0.015 max |
| Phosphorus | 0.015% max | 0.015 max |
Mechanical Properties
The mechanical properties of ASTM B167 Inconel 600 and Inconel 625 seamless pipes are as follows:
| Property | Inconel 600 | Inconel 625 |
|---|---|---|
| Tensile Strength | 80,000 psi (550 MPa) min | 120,000 psi (827 MPa) min |
| Yield Strength | 35,000 psi (240 MPa) min | 60,000 psi (414 MPa) min |
| Elongation | 30% min | 30% min |
| Hardness (HV) | 1,371°C - 1,416°C (2,500°F - 2,580°F) | 1,293°C - 1,354°C (2,360°F - 2,469°F) |
| Melting Range | 8.42 g/cm³ | 8.44 g/cm³ |
| Modulus of Elasticity | 200 GPa (29,000 ksi) | 200 GPa (29,000 ksi) |
| Poisson's Ratio | 0.30 | 0.30 |
Steel Grade
The steel grades associated with ASTM B167 Inconel 600 and Inconel 625 seamless pipes are as follows:
- Inconel 600: Steel Grade UNS N06600
Inconel 625: Steel Grade UNS N06625
Application
ASTM B167 Inconel 600 and Inconel 625 seamless pipes find application in various industries due to their exceptional properties. Some common applications include:
- Chemical processing: These pipes are used in chemical plants for handling corrosive substances and high-temperature environments.
- Aerospace: Inconel seamless pipes are utilized in aerospace components and gas turbine engine exhaust systems.
- Oil and gas industry: They are suitable for downhole and surface applications, such as well casings, tubing, and piping systems in harsh environments.
- Heat exchangers: Inconel pipes are used in heat exchangers for their resistance to high temperatures and corrosion.
- Marine industry: These pipes are employed in seawater and marine environments due to their excellent resistance to chloride-induced stress corrosion cracking.
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