Material description for large-diameter metric pipe fittings
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Recently, I encountered a problem that’s quite confusing, so I’d like to discuss it with everyone:1. 90-degree long-radius elbow, DN200, wall thickness 8 mm, metric system; material: B366.N04400.
Description 1: Elbow 90EL DN200-8 II ASME B 16.9.
Description 2: Elbow 90EL DN200-8 II GB/T12459.
2. 90-degree short-radius welded elbow, DN1500, wall thickness 18 mm, metric system; material: L245.
Description: Elbow W90ES DN1500-18 II L245 SH/T3408.
3. 90-degree long-radius welded elbow, DN1800, wall thickness 18 mm, metric system; material: L245.
Description: Elbow W90EL DN1800-18 II L245 SH/T3408.
Which of these descriptions is correct? Or are all of them incorrect? Everyone is welcome to share their opinions
Based on the material description, all three descriptions seem reasonable. Among them, B366.N04400 is a cobalt-nickel-copper alloy material commonly used in applications requiring resistance to corrosion and high temperature and pressure ； L245 is the material grade for oil and gas pipeline steel pipes. The description of elbows can be carried out in accordance with various standards and specifications. Descriptions 1 and 2 follow the ASME B 16.9 and GB/T 12459 standards, while Description 3 utilizes the SH/T 3408 standard. Although the descriptions and nomenclature of elbows may vary slightly among these standards, they all comply with the relevant standard requirements. Therefore, all three descriptions are reasonable; they merely differ slightly in their wording. .