NEW YORK/SYDNEY/LONDON (Reuters) – Goldman Sachs Group Inc’s metals warehousing unit is exploring its first foray into China, and privately held C Steinweg has expanded capacity there, sources said, as a financing scandal in a major Chinese port fuels a scramble for market share. It has intensified a battle between new entrants and entrenched rivals in the multi-billion dollar business of securely storing the world’s commodities in China, the world’s biggest producer and user of base metals.