Importance

Loading Importance Indicators...

Abstract

A production method of a roughly shaped material for an engine piston includes a continuous casting step for obtaining a cast rod (31) having a diameter of 85 mm or less by continuously casting a molten aluminum alloy (30) at a molten alloy temperature of 720° C. or higher, and a forging step for obtaining a roughly shaped material (11) for an engine piston by forging a forging material (32) obtained by homogenizing the cast bar (31) at 370 to 500° C. A composition of the molten alloy (30) includes Si: 11.0 to 13.0 mass %, Fe: 0.6 to 1.0 mass %, Cu: 3.5 to 4.5 mass %, Mn: 0.25 mass % or less; Mg: 0.4 to 0.6 mass %, Cr: 0.15 mass % or less, Zr: 0.07 to 0.15 mass %, P: 0.005 to 0.010 mass %, Ca: 0.002 mass % or less, and the balance being Aluminum and inevitable impurities.

Loading the Abstract Image...

First Claim