The Baltic Exchange's main sea freight index, tracking rates for ships carrying dry bulk commodities, fell on Tuesday weighed down by lower rates for capesize vessels. The overall index, which factors in rates for capesize, panamax, supramax and handysize shipping vessels, was down 22 points, or 3.57 percent at 594 points. The capesize index fell 85 points, or 10.16 percent to 752 points. "Cape rates continue to slip back on thinner volumes following recent pressure on Chinese steel prices," ship brokerage firm Clarksons Platou Securities said in a note. Chinese rebar steel futures posted their biggest intraday fall in seven years on Tuesday, as worries about demand in the world's second-biggest economy extended a rout that has spilled over into other industrial raw materials.