In general, when the thickness of SA516Gr.70 (SA516Gr.485) steel plate is less than or equal to 1.5in. (40mm), it has been delivered in hot rolled condition. When the SA516Gr.70 plate thickness is greater than 1.5in. (40mm), normalizing heat treatment, or stress relief treatment, or normalizing plus stress relief treatment process is used. SA516Gr.70 steel is equivalent to A516 Gr70 steel.
The requirements for the main chemical elements of SA516Gr.70 steel are as follows:
[C content]: When theSA516Gr.70 steelsheet thickness is less than or equal to 12.5mm [C content] ≤0.27; When the thickness is greater than 12.5mm and less than 50mm [C content] ≤0.27; When the thickness is greater than 50mm and less than 100mm [C content] ≤0.30; The SA516Gr.70plates thickness is greater than 100mm And less than 200mm [C content] ≤0.31.
[Mn content]: when the thickness is less than or equal to 12.5mm [Mn content] between smelting analysis 0.85 -1.2, finished product analysis between 0.79-1.3; when thickness is greater than 12.5mm [Mn content] smelting analysis between 0.85 -1.2, finished product analysis Between 0.79 -1.3.
[P content, S content]: excluding the thickness range ≤0.035
[Si content]: Melting analysis is between 0.15 -0.4, finished product analysis is between 0.13 -10.45.
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