Lightweight piston for internal combustion engine in motor vehicle, has piston upper portion comprising piston head, that is joined to piston lower portion comprising piston skirt

摘要

#CMT# #/CMT# The piston has piston upper portion comprising a piston head, and a piston lower portion comprising piston skirt. The lightweight piston is provided as two components. The piston upper portion consists of ultra high carbon lightweight steel and the piston lower portion consists of steel with a high thermal expansion. The piston upper portion is joined to piston lower portion. #CMT# : #/CMT# Independent claims are included for the following: (1) semifinished product for producing top portion for lightweight piston; and (2) process for preparation of lightweight piston. #CMT#USE : #/CMT# Lightweight piston for internal combustion engine in motor vehicle and commercial vehicle. #CMT#ADVANTAGE : #/CMT# The piston with lightweight and improved mechanical properties is manufactured easily and efficiently, by using ultra high carbon lightweight steel and steel with high thermal expansion. #CMT#METALLURGY : #/CMT# The composition of ultra-high carbon steel consists of 0.7-2.0 weight% of carbon, 5.0-12.0 wt% of aluminum, 0.01-2.8 weight% of silicon, 0-2.0 wt -% of chromium, 0.0-5.0 wt% manganese and the remaining portion consists of iron.