ASTM A358 pipe
What is ASTM A358 pipe specification? (130)
ASTM A358 is a standard specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Alloy Steel Pipe for High-Temperature Service and General Applications. This specification covers both seamless and welded pipes. It contains different classes such as Class 1, 2, 3 or 4 that define the levels of thickness, strength, chemical composition and other requirements depending on the application.
This pipe has several important characteristics such as high corrosion resistance, good formability, excellent creep strength and better workability than most other grades of stainless steel. The ASTM A358 specification provides more precise tolerances on wall thickness and diameter measurements when compared to the regular grades of stainless steel pipes. It is used in many applications where higher strength and/or heat resistance are required, such as industrial boilers, high-pressure pipelines, condensers and heat exchangers.
ASTM A358 pipe
What is the difference between ASTM A928 pipe and ASTM A358? (204)
The two ASTM pipe standards, ASTM A928 and ASTM A358, both specify requirements for steel pipes that are used in industrial or structural applications. While there are similarities between the two, they also have a few key differences.
ASTM A928 is primarily used to make electric-fusion welded stainless steel tubing for structural applications. It covers the chemical and mechanical properties of ferritic and austenitic grades of stainless steel. This standard applies to material with a thickness greater than 4mm and smaller than 12.7mm (1/2”).
ASTM A358 on the other hand is a specification for seamless and electric-fusion welded steel pipe. It requires that the material used in these applications must meet certain strength requirements depending on the type of pipe being made. For example, straight-seam pipes have a maximum tensile strength requirement of 205MPa whereas spiral-welded pipes need to be able to withstand 275MPa before cracking or splitting. The standard also specifies material with a thickness of 2mm up to 63.5mm (2 1/2″).
In summary, while both ASTM A928 and ASTM A358 apply to steel pipe applications, they differ in terms of their chemical and mechanical properties as well as their applicable thickness range for different types of pipe structures.
What are grades of ASTM A358 pipe? (161)
The grades of these pipes vary depending on the chemical composition and mechanical properties. The most common grade is 304, which is an austenitic stainless steel alloy containing 18% chromium and 8% nickel. It offers good strength, corrosion resistance and formability, making it suitable for many applications. Other grades available include 316L, 321 and 347, each of which offers increased corrosion resistance.
Grade 304 provides a higher strength-to-weight ratio than other grades due to its low carbon content, allowing for thinner wall thicknesses. Grade 316L contains higher levels of molybdenum to improve its resistance to chloride environments such as seawater. Grade 321 provides superior intergranular corrosion resistance in high-temperature environments and can be welded without affecting the properties of the metal. Grade 347 has the highest tensile strength among the grades, offering a maximum operating temperature of 850 degrees Celsius.
Overall, ASTM A358 pipe offers a wide range of grades with different physical and chemical characteristics to meet various industrial needs.
What is ASTM A928 pipe specification? (137)
ASTM A928 is an American Society for Testing and Materials (ASTM) specification that covers ferritic and austenitic duplex stainless steel pipe. This grade of steel pipe offers superior corrosion resistance, making it well-suited for use in seawater applications. ASTM A928 covers nominal wall thicknesses up to and including Schedule 40S, with outer diameters from 1/8 inch to 30 inches. It can also be manufactured with dimensions as required by the customer.
The composition requirements for ASTM A928 pipe include Ni (min 8%) plus Cu (min 0.75%), chromium content range 17–27%, molybdenum range 2–4% and nitrogen 0.1% minimum and no more than 0.2%. The mechanical properties such as tensile strength, yield strength, and elongation should conform to the specified requirements, which are designed according to the end application of this type of piping system.
Is ASTM A358 pipe imported into Saudi Arabia? (160)
No, this pipe is not imported into Saudi Arabia. This type of steel pipe is made in the United States and is primarily used for piping applications that require a higher strength-to-weight ratio than regular carbon steel pipes. The most common application is carrying corrosive liquids, as it has an increased corrosion resistance compared to standard grades.
ASTM A358 does not meet the standards required for import into Saudi Arabia and other Middle Eastern countries due to its relatively low chemical content when compared with the standards laid down by various governments in the region. Furthermore, certain testing requirements may not be available or even known outside of the U.S., which could potentially make importing these pipes into Saudi Arabia problematic and complicated.
Therefore, while this type of pipe can provide several benefits due to its increased strength-to-weight ratio and improved corrosion resistance, unfortunately, it is not suitable for importation into Saudi Arabia due to incompatibility with regional requirements.