We are buying some plate material conforming to SA516Gr70. The Nb content in the product was found to be 0.05%. As per SA20-Table 1-Note D, Nb in product should be limited to 0.03%, but higher content up to 0.05% may be accepted by agreement between purchaser and seller. This plate is meant for shell and dished head of a vessel which is in Hydrogen service. The thickness of the plate is 32mm for Dish, and 28mm for the shell. The design temperature of the equipment is 150 DegC, while the normal operating temperature is 120 DegC. Please share your views, and guide.
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