技术参数:
1.船用舱口链 HATCH COVERS CHAIN
材质: 20Mn 20MnV 25MnV
marerial: 20Mn 20MnV 25MnV
表面状态:热处理后滚光上防锈油或热处理后热镀锌
surface: polished and rust proof oil oil after heat
Treated hotdipped galvanized after heat treated black
2.捆绑链 BIND ING CHAIN
材质:低碳钢（Q235）成合金钢（25MnV.20MnV等）
marerial: mild steel (Q235) allov steel (25MnV.20MnV)
3.矿用链: MINING ROUND - LINK CHAIN
符合GB/12718-91标准（B,C级要求）。