ASTM B423-22
Seamless pipes and tubes made of nickel-iron-chromium-molybdenum-copper alloy are governed by a standard specification. This particular specification outlines the requirements and parameters for manufacturing these pipes and tubes. The alloy composition includes nickel, iron, chromium, molybdenum, and copper. The seamless construction ensures a smooth and continuous surface, making these pipes and tubes ideal for various applications.
The standard specification sets forth the dimensions, tolerances, and mechanical properties that must be met by manufacturers. It details the acceptable range of sizes, including the outer diameter, wall thickness, and lengths of the pipes and tubes. Additionally, the specification outlines the permissible variations in these dimensions to ensure that the final product meets the necessary standards.
Furthermore, the standard specification defines the chemical composition and mechanical properties of the nickel-iron-chromium-molybdenum-copper alloy. It specifies the maximum and minimum percentages of each element in the alloy, ensuring consistent quality and performance. The mechanical properties, such as tensile strength, yield strength, and elongation, are also specified to guarantee the durability and reliability of the pipes and tubes.
Additionally, the standard specification addresses the testing and inspection requirements for these seamless pipes and tubes. It mandates various types of non-destructive examinations, such as ultrasonic testing and visual inspection, to detect any defects or imperfections. Hydrostatic testing may also be performed to ensure the structural integrity and leak-tightness of the pipes and tubes.
In conclusion, the standard specification for nickel-iron-chromium-molybdenum-copper alloy seamless pipe and tube serves as a comprehensive guideline for manufacturers in producing high-quality and reliable products. By adhering to this specification, manufacturers can ensure the consistency and performance of these pipes and tubes, making them suitable for various industrial applications.
The ASTM B423 / ASME SB 423 specification pertains to the category of nickel-iron-chromium-molybdenum-copper alloys. This specification outlines the requirements for these alloys and provides guidelines for their manufacture and use in various applications. These alloys are known for their unique combination of properties such as high resistance to corrosion, good mechanical strength, and exceptional performance under high temperatures. The use of these alloys is widespread in different industries and applications, including oil and gas, chemical processing, aerospace, and marine engineering. Adherence to this specification is essential to ensure the quality and reliability of the materials, which, in turn, ensures the overall success of the projects that utilize them.
Incoloy 825 UNS N08825This product description pertains to seamless pipes and tubes made from three nickel-chromium-iron alloys, namely UNS N06625, UNS N08825, and UNS N08221. These pipes and tubes are designed for general use in corrosive environments and are available in both cold-worked and hot-finished varieties.
Specification B423 of ASTM covers the specifications for cold-worked and hot-finished seamless pipe and tube made from nickel-iron-chromium-molybdenum-copper alloys. These alloys are primarily designed for use in general corrosive service. The requirements and standards for the manufacturing and properties of the pipe and tube are outlined in detail in Specification B829. This specification ensures that the products conform to the necessary quality standards and are suitable for their intended application.
ASTM B423 UNS N08825 Chemical Composition
The chemical composition of materials used in various applications must adhere to the specified limits for nickel, chromium, iron, manganese, carbon, copper, silicon, sulfur, aluminum, titanium, and molybdenum, as outlined in this specification. It is crucial to ensure that all chemical requirements are met to ensure the quality and durability of the final product. Therefore, strict adherence to these regulations is imperative to produce materials that meet industry standards and exceed customer expectations. So, it is essential to carefully monitor the composition of the materials during the production process to ensure their compliance with the given limits.
| Grade | C≤ | Mn≤ | Si≤ | S≤ | Cu≤ | Fe(min) | Ni | Cr | Al | Ti |
| Incoloy 825 | 0.05 | 1 | 0.5 | 0.03 | 1.5-3.0 | 22 | 38.0~46.0 | 19.5~23.5 | 0.2 | 0.6-1.2 |
Allowable deviations for tubes with small diameters and thin walls are as follows:
1. Outer Diameter (OD) Variation:
- The outside diameter of the tube can vary within a permissible tolerance range. This variation ensures that the tube's dimensions are within an acceptable limit.
- The permissible outer diameter variation for small-diameter and light-wall tubes should be carefully determined to maintain the functionality and integrity of the tube.
2. Wall Thickness Variation:
- The thickness of the tube's wall may experience slight variations within a specified range. These deviations are allowed to account for manufacturing constraints and ensure the tube meets required specifications.
- The permissible wall thickness variation for small-diameter and light-wall tubes should be within predefined limits to guarantee structural strength and performance.
3. Length Variation:
- The overall length of the tube may slightly deviate from the nominal length. These permissible length variations commonly occur due to manufacturing processes such as cutting and finishing.
- The permissible length variation for small-diameter and light-wall tubes should be within an acceptable range to maintain dimensional accuracy and facilitate proper installation.
4. Straightness Variation:
- The straightness of the tube is an important aspect of its quality. Permissible variations allow for minimal deviations from perfect straightness, which may occur during production, handling, or transport.
- The permissible straightness variation for small-diameter and light-wall tubes should be defined to ensure they meet required levels of straightness while allowing for practical manufacturing and handling constraints.
It is crucial to establish and communicate these permissible variations for small-diameter and light-wall tubes to ensure consistent quality, dimensional accuracy, and functional performance. Manufacturers, suppliers, and customers should adhere to these specifications during production, inspection, and application of the tubes in various industries.
| Specified Outside Diameter, in. (mm) | Outside Diameter, in. (mm) | Inside Diameter, in. (mm) | Wall Thickness, % | |||
| + | - | + | - | + | - | |
| Under 3/32 (2.4) | 0.002 (0.05) | 0 | 0 | 0.002 (0.05) | 10 | 10 |
| 3/32 to 3/16 (2.4 to 4.8), excl | 0.003 (0.08) | 0 | 0 | 0.003 (0.08) | 10 | 10 |
| 3/16 to 1/2 (4.8 to 12.7), excl | 0.004 (0.10) | 0 | 0 | 0.004 (0.10) | 10 | 10 |
| 1/2 to 1 1/4 (12.7 to 31.8), incl | 0.005 (0.13) | 0 | 0 | 0.005 (0.13) | 10 | 10 |