... steel as per the Standard GB,JB,CB,ZB,JIS,ASTM,SAE,DIN or special requirements from Customers.1) Chain wheel, gear wheel ... , block, module etc.(6) Fire grate car, carrier wheel, driving chain, chain wheel etc. for mine metallurgical engineering .(7) Support of bridge ... declared NK,DNV,BV,ABS,CCS,Germany classification society attestation. chain wheel