Ind-Ra has revised the outlook on the non-ferrous metals sector to negative for 2016-17, from stable for 2015-16, it said in a statement.
"The agency has also revised outlook on sector companies to Negative for FY 2016-17, from Stable in FY 2015-16. It expects the sustained deterioration in metal prices from current levels to be the key driver of possible rating downgrades," it added.
Although industry players have been maximising free cash flows with cost control and a reduction in working capital cycles, weak demand growth, import pressure, low physical premiums and sub-optimal capacity utilisation are likely to delay deleveraging, the agency said.
This is despite a substantial decline in the stock-to-use ratio. This means prices have fallen despite a tighter physical market, it added.
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China, which consumes 40-50 per cent of the global major base metals, is facing an economic slowdown. This means a surplus in the global market and therefore a delay in price recovery, Ind-Ra said.
For domestic players, slowing Chinese economic growth implies increased competition from low-cost imports into India as well as competition in the export market, it added.
The agency added it expects imported alumina to continue to replace domestic alumina due to price difference between the two. It also expects non-integrated players in aluminium sector to record improving operating margins.
"Ind-Ra believes the weak domestic demand growth and surplus capacity could lead to low capacity utilisation in 2016-17 fiscal. This is despite the agency's expectation of a moderate pick-up in consumption growth during second half of FY'17," it said.
Efficient new capacities in China as well as low alumina and energy costs have recalibrated the cost curve globally.
For copper, Indian custom smelters are likely to see steady margins with continued surplus in the availability of copper concentrates.
The agency expects local premiums for zinc to remain low despite concentration in the market, due to a global surplus. Weak demand in export markets is likely to lead to a surplus despite the global depletion in mining output.