... the material of carbon or low alloy steel. Product Name: Marine rudder/shaft/ sternpost system, such as rudder blade, quill shaft ... area of metallurgy, mine, power plant,railroad, cement, engine bed, wind electricity, astronautics, shipbuilding and so on. We can provide OEM ... .,Ltd. is the leading manufacturer of large-scale cement and marine sand casting products in the north of Jiangsu Province. Its ...