Forming Heads by Hot Press¹

Product Description Hokkai Provided Hemispherical head to our clients with heavy wall thickness for oil&gas industry equipmentsThere are lots of requirements for this dished head included material plates,  formings and tolerance.The dished heads specification as the followHHA ID3015*MIN (50+3MM), CUT BACK 150MMMaterial requriment1, the supplier shall guarantee that the plates suppllied are free of cavity, lamination and cracking, and without any defects2, no weld repair shall be permitted3, the vendor shall guarantee the commodities furnished are the new ones4, gengeal requirements of base metal shall conform to applicable requirements of ASME SA-20, and clading plates shall conform to applicable  requirements ofASME SA-4805, The base plates of SA516GR70 shall be ultrasonically examined in accordance with A-579 level A, Supplementary requirements S16,  The cladding metal and the base metal shall be heat treat per individual material specification before bonding. the heat treatment (simulated pwht of mechanical test oupons) for the cladding plates after bonding shall be as followsheat treatment 1 cycleHolding temperature 510+/-28degreecooling rate max 56 degree/hrholding time : min10hr7,The minimum shear strength of the cladding plates shall be 20,000PSI(140MPA),Shear strength test shall be made in the manner indicated in ASME SA-264 FIG.1For formed hemispherical head1, the formed hemispherical head shall be spun or pressed form blanks of sufficient thickness to achieve at least the minimum thickness.2, the vendor shall guarantee the formed hemispherical head are the new one.3,each head in welding bevel edge shall be 100% magnetic=particle examination to avoid flaws,cracks,laminatons or others defects.4, welding groove shall be shaped to the final welding geometry and 100% magmetic particle examination for defects.5, tolerance for formed hemispherical head shall conform to UG-81,ASME Code section Viii-1, although the following tolerance as shown in drawing, are notcovered by the code and shall be adhered to by the supplier6, inside and outside surface of formed hemispherical heads before shipment shall be cleaned,dry and free of scale1, Hokkai Group2,YIXING HOKKAI    * Established in Mar 1994    * Start to produce in Oct 1995   * Became 100% Japanese owed in Aug 2000   * Purpose: Based on the HIW accumulative head plates experience for kinds of industries, service to the development of chinese industry   * Investor: Hokkai Iron Works 89.9%, Hokkai Limited 10.1%   * Total investment: USD26.3million; registered captial: 12million   3, YIXING HOKKAI DISHED ENDS ORDER PROCESS     4, YIXING HOKKAI PRODUCTION PROCESS    5, YIXING HOKKAI QC SYSTEM      

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