. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CASTINGS IN ACTION
Casting Critical to Oil Drill Safety Cast Component: Steel insert plate for oil blow-out
preventer.
Material: Nickel-chromium-molybdenum low alloy steel.
Process: Green sand casting.
Casting Supplier: Pacifi c Steel Castings, Berkeley, Calif.
• The nominal performance requirements for the steel plate castings are 85 ksi yield strength, 235 HB Brinell hardness, 0.03-in. tolerance on machined surfaces, and between 500 and 900 RMS fi nish on as-cast surfaces.
• Typical steel insert plates, which reinforce a packing ring used to shut off over-pressure gas and oil fl ow in drilling equipment, measure 14 x 6 in. with a 2-in. thick center bar and weigh 25 lbs.
• Although the individual part did not require a core, the metalcaster utilized one to produce two castings in the same mold, cutting production costs.
18 METAL CASTING DESIGN& PURCHASING
SEPTEMBER/OCTOBER 2010
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