Regarding the material of pipeline flanges
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I recently received a project where the client requested that the flanges, fittings, and pipe materials be made from either 316/316L dual-grade steel or 304/304L dual-grade steel. It should be noted that the 316/316L dual-grade steel option does not mean choosing between just 316 or 316L. I was wondering if any of you are familiar with or have used fittings made from this type of material, and if there are any relevant standards available for reference. Thank you in advance.
And meet the hardness and yield strength requirements of 316 material. It is also necessary to meet requirements such as low carbon content for 316L; in other words, the advantages of two different grades are combined. Many steel pipe manufacturers are now able to fulfill this requirement.
ASME has specification requirements for the composition of this steel; there are no similar standards in China yet. However, some domestic manufacturers are capable of producing it, though the production time is relatively long.
Double steel standards, two different grades. 2nd floor is correct
It is to keep the carbon content between the two values.
It’s about controlling the carbon content in 304 steel; very low carbon levels result in lower strength, which forces an increase in the pressure rating
It’s actually 316L and 304L; you just need to ask the material supplier to provide certificates for both materials. The advantages of choosing two grades mentioned on the 2nd floor. Steel mills have never had such a saying. Just produce what is required as needed. There are no such things as advantages and disadvantages.
This is the requirement of the American standard; the corresponding European standards are 1.4301/1.4307. It is identical to China’s standards 30408/30403.