Yixing Hokkai Head Plate Co., Ltd.  

Product Name: Carbon Steel SA516gr70 Hemispherical Heads Model NO.: HHA Material: Alloy Type: Connection Standard: International Customized: Customized Color: Fixed Certification: ISO, TUV Hot Press: 5000 Trademark: hokkai Transport Package: Steel frame Specification: HHA Origin: China HS Code: 73269019 Product Description This hot press dished heads are for one of our main clients in taiwan,which is serviced in oil&gas industryThe raw material was supplied to them as the below condition :1,Supplier must guarantee that the plates supplied are free of cavity,Lamination and cracking, and without defects2,no weld repair shall be permitted3,general requirements of plates SA516GR70 shall conform to the applicable requirements of ASME 204,Plaes shall be ultrasonically examined in accordance with the requirements of ASME SA-578 Level A, and S15,The plates for formed headsshall be performed the following supplementary requirements S3 1 cycle holdingtemp 600-620 degree, coolingrate 65mm thk max 56c/H, holding time:65 thk min 2.5H6,All items shall be normalizedand thedetailsrequriement for formed dished heads as follow1,each head in welding bevel edge shall be 100% MT examination to avoid flaws, cracks, Laminations or others defects2,welding groove shall be shaped to the final welding geometry and 100% MT examintion for defects3,Tolerance for dished end shall conform to UG-81,ASME SECTION VIII-14,Inside and outside surface of the dished heads before shipment shall be cleaned ,dry and free of scale5 welding line isunavoid on dished end,the welding line should be 100% radiograhed in accordance with ASME Code,