concrete mixer plant mixing arm Specification: hardness:52-62HRC useful life:can be produced more than 200000 cubic meter concrete or 300000 tons asphalt material:Hi-chrome standard: CN:KM TB Cr 15-25-GT US:ASTM A532 Class Two Type D strength of extension:380 N/mm2 extension at break:1% shock impact(resistance)value:>5 ak N.M/CM2 flexuralstrength:>600 ak N.M/CM2 certification:ISO9001:2008 application:concrete mixer production methods:casting technology 1,the choosing of the chemical composition is scientific 2,advanced testing way 3,advanced technique and possess for smelt