Apparently, drawing comparisons between A193 and A320 grade comes naturally. Thanks to a majority of common attributes, these two grades are held quite similarly to their mechanical and chemical requirements. However, these two aren’t alike in all cases. Precisely, the grade A193 bolts are needed in high temperate and high pressure applications, whereas A320 is meant for cryogenic range.
Basically, a customer looking for A320 grade B8M bolts would have classic requirements for cold temperature applications. The AISI 304 type comprises this category of for class 1 Stainless Steel where it is carbide solution treated for delivering high-quality performances. The mechanical and chemical properties may rarely see a fluctuation due to the given order of manufacturing.
Both class 1 and class 2 of A320 grade B8 bolts are carbide solution treated. However, in class 2, these bolts are strain annealed to achieve additional results. Since ASTM A320 specially covered the bolts and fasteners for low temperature applications, the most common applications used to be in valves, flanges, vessels, and fittings. Excluding a few, the ASTM A320 specifications recommend a Charpy impact test for all grades. Definitely, it is held in order to test the toughness of a material. Nevertheless, carbide solution treated and strain hardened grades like B8 and B8M would not be required.
Unless one settles for one brand irrespective of the quotes they offer, there should be an all and out competition between suppliers and manufacturers to deliver the best quality products to the customers or clients.
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