The Vale Beijing, the globe's largest bulk carrier, is disabled in a Brazilian port and shipping agents tell Reuters the vessel had ruptured its hull. If the $110 million vessel should sink it could also turn out the be the final nail in the coffin of Vale's disastrous strategy to tighten its grip on the world's annual 1 billion tonnes sea-borne iron-ore trade. China, the world's number one market for the steelmaking ingredient to where Vale ships about 45% of its output, turned away another carrier in the fleet earlier this year.