ASTM B464 is a standard specification for welding processes in pipe manufacturing, specifically addressing the requirements for UNS N08020 alloy pipe. The following is a detailed introduction to the ASTM B464 standard, UNS N08020 alloy, its material characteristics, applications, production and quality inspection:
ASTM B464 Standard Introduction:
1. Purpose and Scope:
ASME SB464 standard aims to standardize the manufacturing requirements for UNS N08020 alloy pipes, including requirements for materials, dimensions, mechanical properties, chemical composition, welding processes, etc.
2. Scope of application:
ASTM B464 alloy 20 welded pipe is suitable for pipe manufacturing requiring high corrosion resistance in chemical industry, petroleum, food processing and other fields.
3. Standard Content:
Includes specific regulations on pipe size, chemical composition, mechanical properties, welding requirements, etc.
4. Manufacturing Process:
Including requirements for pipe manufacturing, heat treatment, welding and surface treatment.
ASTM B464 UNS N08020 Alloy Introduction:
1. Material Features:
UNS N08020 is a nickel-chromium-iron alloy with excellent corrosion resistance, especially in sulfuric acid environments.
2.4660 alloy 20 has good mechanical properties and weldability, and is suitable for use in high temperature and high pressure environments.
2. Application areas:
N08020 material mainly used in the manufacturing of acid-base medium transportation pipelines, equipment and containers in the chemical industry, such as sulfuric acid plants, phosphoric acid plants, etc.
ASTM B464 UNS N08020 Chemical Requirements
| Element | UNS N08020 Composition,% |
|
| Carbon,max | 0.07 | |
| Manganese,max | 2.00 | |
| Phosphorus,max | 0.045 | |
| Sulfur,max | 0.035 | |
| Silicon.max | 1.00 | |
| Nickel | 32.00-38.00 | |
| Chromium | 19.00-21.00 | |
| Molybdenum | 2.00-3.00 | |
| Copper | 3.00-4.00 | |
| Columbium | 8xcarbon-1.00 | |
| (Nb)+ | ||
| tantalum | ||
| Nitrogen | ... | |
| Iron | remainder | |
Alloy 20 Mechanical Property Requirements
| Tensile Strength min,ksi (MPa) 80(551) |
Yield Strength, min,ksi (MPa) 35 (241) |
Elongation in 2 in. (50.8 mm),min,% 30.0 |
Key Points For Production And Quality Inspection:
1. Production process:
Vacuum melting, hot rolling, cold drawing and other processes are used to produce pipes to ensure the uniformity and stability of the material.
Strictly control the temperature, pressure and time of each process link to ensure that the pipe quality meets standard requirements.
2. Welding requirements:
Alloy 20 welded pipes use TIG, MIG and other welding processes to ensure the quality of welds.
Preheating and post-welding heat treatment should be carried out before welding to eliminate the stress in the welding area and improve the corrosion resistance of the weld.
3. Quality Inspection Measures:
Including chemical composition analysis, mechanical performance testing, dimensional testing, welding joint testing and other testing measures to ensure that product quality meets standard requirements.
Conduct non-destructive testing on the surface of the pipe, such as ultrasonic testing, magnetic particle testing, etc., to eliminate defects and ensure the safety of the product.
In summary, the ASTM B464 standard provides detailed specifications for the manufacture of UNS N08020 alloy pipes, covering material characteristics, applications, production and quality inspection requirements, ensuring the quality and safety of pipe manufacturing.
