Follow standardized annealing curve. Sample mechanical tests: tensile strength, elongation and hardness. Ensure qualified malleable iron microstructure.
For hot dip galvanized items: uniform zinc coating, no missing plating. Clean thread zinc residue after galvanizing. Anti rust protection for finished goods.
Chemical composition test for raw iron and scrap steel. Strict control of sulfur & phosphorus content for good ductility. Batch traceability records kept.
Mold regular checking. Monitor pouring temperature & speed. First piece inspection for each batch. Remove all burrs, avoid damage to threads and sealing surfaces.
Check critical dimensions with calipers. Test threads by thread gauges (go / no go). No chipped or damaged threads.
Reject parts with cracks, penetrating sand holes and cold shuts. Thread and sealing area free of defects.
Hydro static pressure testing. No leakage, sweating or permanent deformation under rated pressure. Defective pieces scrapped directly.
AQL sampling before shipment. Clear marking of size and logo. Complete batch records for full traceability
Better ductility than grey cast iron, anti shock against vibration.
Ideal for water, gas, steam and compressed air pipeline systems.
Precise threading for tight sealing and fast on site installation.
Hot dip galvanized finish protects fittings from rust in harsh environments.
Reliable performance for both cold and hot fluid transmission.
Competitive cost with dependable quality for plumbing & industrial projects.
Universal standard sizes, simple assembly and disassembly.
Stable metallurgical structure delivers outstanding durability.
Providing high quality and comprehensive service. Welcome to contact us and get a quick response.
