... . Material:50CrVA No of leaf: 2 leave Weight: 53.75kg beam spring 1.Namebeam spring 2.standardDIN, ASTM,JIS,BS,AS ... material we use are SUP7,SUP9,SUP9A,SUP11,SUP11A.We can produce over 30,000 tons per year with general capacity ... Asia, Mid-East, Euro, North-America, South-America and Africa. Beam Spring for Bus