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Steel Grade Coupling Tubular Body API Tubing and Casing: H40 None None or black band at the manufacturer's option J55 all green. one green band K55 all green two green bands N80-1 all red one red band N80-Q all red + one green band one red band + one green band L80-1 all red + one brown band one red band + one brown band L80-9Cr
SMS - Plain gauge (0.8mm) drawn tubeset in high tensile steel. [8] Replaced 531 plain gauge in 1980, replaced by 453. 453 - cromoly steel alloy. Reynolds produced only the 3 main tubes in this alloy and they were single butted, replaced by 500 series. 500 - A chromium-molybdenum (CrMo) steel, seamed, plain gauge tubeset of 3 main triangle tubes
The approximate alloying composition of 531 tubing is 1.5% Mn, 0.25% Mo, 0.35% C, and is similar to the old British BS970 En 16/18 steel (EN 16 is similar to grade BS970 605M36). Its mechanical properties and response to heat treatment are broadly similar to the AISI 4130 standard alloy steel, also used for bicycle frames, motorcycles, as well ...
AN fittings are a flare fitting, using 37° flared tubing to form a metal-to-metal seal. They are similar to other 37° flared fittings, such as JIC , which is their industrial variant. [ 2 ] The two are interchangeable in theory, though this is typically not recommended due to the exacting specifications and demands of the aerospace industry.
The most common flare fitting standards in use today are the 45° SAE flare [2] [3],the 37° JIC flare, and the 37° AN flare. For high pressure, flare joints are made by doubling the tube wall material over itself before the bell end is formed. The double flare avoids stretching the cut end where a single flare may crack.
ASTM A500 is a standard specification published by the ASTM for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes. It is commonly specified in the US for hollow structural sections , but the more stringent CSA G40.21 is preferred in Canada.
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Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...
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