this tube sheets was produced by sand casting method, the material is ASTM A351 Gr HK40, or in DIN 1.4848.
We produced these tube sheets for an Italian foundry, who has long term cooperation with HEXIN , even though they produce castings by themself, but they also appoint us for some challenging jobs from us, because they trust HEXIN as a brand of reliable quality of  castings,  like centrifugal castings tubes  of radiant tubes, furnace rolls, investment castings of cast baskets, cast trays, cast racks, and the most critical petrochemical castings like tube sheets, brackets, hangers, Y pieces, elbows, and more.