SMM analysis: why the collective rise in lead prices of metals is so weak? Recently, the trend of lead prices can be described as "fragile". The surrounding metals have risen collectively, and Shanghai tin and Shanghai aluminum have repeatedly brushed new highs, but Shanghai lead has continued to decline since mid-late July. Today, the main lead in Shanghai closed down again by 1.64 per cent at 15025 yuan per tonne, down 8.5 per cent from its high on July 26th.