I have never seen SA516-60/SA516-70 dual marked material. I think it’s almost impossible marking considering chemical properties. 300 series austenite stainless steel such as 304/304L, 316/316L is commonly marked as dual on mill certificate. Dual mark is a quite advantageous choice for mill maker. Because they can produce two kinds of product at one line. Also it make easier management of stock.
And If you use dual marked material, you have to choice a material type according to fabrication drawing. Because a designer specify only one material (not dual marked material) on relevant drawing considering strength, corrosion and etc.
what is the purpose of using a dual certified material.
Example - Plate used for vessel fabrication as per ASME SEC VIII DIV1 is dual certified as SA 516 GR 60 and SA 516GR70.
What will be the tensile strength of this plate and impact properties. whether these properties will be as per SA516 GR 60 OR sa 516 GR. 70.
Thanks in Advance.
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