ASTM A671 CB60 CB65 CB70 Electric Fusion Welded Steel Pipe For Atmospheric And Lower Temperatures
Introduction
ASTM A671 is a specification for electric fusion welded steel pipe suitable for atmospheric and lower temperature service. This article provides an overview of ASTM A671 CB60, CB65, and CB70 steel pipes, including their material, specification, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades.
Material and Specification
ASTM A671 CB60, CB65, and CB70 steel pipes are made from carbon-manganese steel plates, which are electric fusion welded. These pipes are designed for atmospheric and lower temperature applications, where high strength and toughness are required.
The specification for ASTM A671 CB60, CB65, and CB70 steel pipes includes the following requirements:
- Pipe sizes range from 16 inches to 100 inches in diameter.
- Wall thicknesses vary from 1/8 inch to 1 inch.
- Pipe lengths can be customized as per project requirements.
- The pipes are available in various grades, including CB60, CB65, and CB70.
Key Features
The key features of ASTM A671 CB60, CB65, and CB70 steel pipes are as follows:
- Excellent weldability and formability.
- High strength and toughness.
- Suitable for low-temperature applications.
- Resistant to corrosion and oxidation.
- Long-lasting performance.
Chemical Composition
| Element | CB60 Composition (%) | CB65 Composition (%) | CB70 Composition (%) |
| Carbon | 0.19 max | 0.24 max | 0.31 max |
| Manganese | 0.95 max | 1.15 max | 1.30 max |
| Phosphorus | 0.025 max | 0.025 max | 0.025 max |
| Sulfur | 0.025 max | 0.025 max | 0.025 max |
| Silicon | 0.13 max | 0.13 max | 0.13 max |
| Nickel | 0.40 max | 0.40 max | 0.40 max |
| Chromium | 0.15 max | 0.15 max | 0.15 max |
| Molybdenum | 0.25 max | 0.25 max | 0.25 max |
| Copper | 0.50 max | 0.50 max | 0.50 max |
Mechanical Properties
| Property | CB60 Minimum Yield Strength (MPa) | CB65 Minimum Yield Strength (MPa) | CB70 Minimum Yield Strength (MPa) |
| Tensile Strength | 415 | 450 | 485 |
| Yield Strength | 240 | 265 | 290 |
| Elongation in 2 inches (%) | 22 | 20 | 18 |
| Impact Test | -50°C (-58°F) | -50°C (-58°F) | -50°C (-58°F) |
Steel Grade
ASTM A671 CB60, CB65, and CB70 steel pipes are categorized based on their minimum yield strength. CB60 has a minimum yield strength of 415 MPa, CB65 has a minimum yield strength of 450 MPa, and CB70 has a minimum yield strength of 485 MPa.
Application
ASTM A671 CB60, CB65, and CB70 steel pipes are widely used in various industries for applications that require reliable and durable piping systems at atmospheric and lower temperatures. Some common applications include:
- Power generation plants
- Chemical processing plants
- Oil and gas refineries
- Water treatment facilities
- Industrial boilers
- Heat exchangers
Possible Alternative Grades
While ASTM A671 CB60, CB65, and CB70 steel pipes are specifically designed for atmospheric and lower temperature service, there are alternative grades available for different temperature ranges and specific requirements. Some possible alternative grades include:
- ASTM A672 C60/C65/C70
- ASTM A691 1-1/4CR/2-1/4CR/3CR
- ASTM A333 Grade 6
It is important to consult the project specifications and requirements to determine the most suitable alternative grade for specific applications.
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