Binzhou Zhengdao Mechanical Manufacturing Co., Ltd.

Binzhou Zhengdao Mechanical Manufacturing Co., Ltd. is based in China and currently lists nine active products in its catalogue. The company focuses on components for the automotive and casting sectors, including piston wear‑resistant rings, various ductile iron grades, and mould tooling. Products such as “Salt Cores For Aluminum Pistons” and “Special‑shaped Salt Core” are listed alongside metal castings like D5B Austenitic Ductile Iron. The catalogue also includes a standard mould classified under HS code 8480.41 made from tool steels H13 or P20. All entries are grouped under the top categories of piston & piston rings, iron pipes, metal castings & forgings, ceramic raw materials, and dies & mouldings.

The salt‑core items fall under HS chapter 38 (HS code 3824.99) and are described as sodium chloride 99.5 %+ with an organic binder system. Three ductile iron products share HS code 7303.00, covering austenitic D5B grade with approximately 5 % silicon and 0.5‑1 % molybdenum, a high‑silicon molybdenum alloy with 5 % silicon, and a ferrite‑pearlite grade corresponding to spheroidal graphite iron grades 400‑15 and 500‑07. The mould is coded 8480.41 and is fabricated from tool steel H13 or P20 depending on the application. Material specifications are explicitly stated in the catalogue, providing buyers with clear chemical composition data. No additional certifications are listed for the supplier.

The catalogue lists three piston‑related items: “Salt Cores For Aluminum Pistons”, “Aluminum Piston Wear‑resistant Ring”, and “Aluminum Piston Wear‑resistant Ring Support Type”. In the casting segment, three ductile iron grades are offered - D5B Austenitic, High‑Silicon Molybdenum, and Ferrite‑Pearlite - each identified with HS code 7303.00 and detailed alloying percentages. A “Special‑shaped Salt Core” (HS 3824.99) and a “Ceramic Salt Core” expand the ceramic raw material line, while a “Mold” (HS 8480.41) provides tooling made from H13 or P20 steel. In the wider industry, piston wear‑resistant rings are commonly produced to hardness levels of 55‑60 HRC and tolerances within ±0.02 mm, and are often coated with molybdenum or nickel‑phosphorus for durability. Ductile iron castings for automotive engine blocks typically meet ASTM A536 Grade 80‑55, with tensile strengths of 80 - 100 MPa and elongation above 10 %. Salt cores used in aluminum piston casting are usually granulated to a particle size of 0.2‑0.5 mm to ensure uniform gas porosity and are bound with organic binders that burn out cleanly during the melt. The moulds for such cores are machined to dimensional tolerances of ±0.1 mm to guarantee repeatable core geometry.