Shanxi Jianing Forging has collected real-world engineering cases of long shafts, short shafts, drive shafts, and marine nuclear power shaft forgings, fully showcasing the forging process of shaft forgings, finished product precision, and practical application scenarios for heavy equipment.
A heavy shipyard in Xiangtan, Hunan, needs to balance high load-bearing performance with corrosion resistance requirements in complex offshore environments during the procurement process of large shaft forgings. The company has long supplied key transmission components to major domestic shipyards, maintaining strict standards for internal microstructure density, dimensional accuracy, and delivery stability of forgings. Leveraging its experience in shaft forgings, Caring Forging customized a full-process solution for this customer, from material selection to heat treatment, completing multiple batches of shaft forgings in bulk.
Ship shaft systems are prone to fatigue cracks and localized corrosion thinning under prolonged high-load operation and seawater corrosive environments. Traditional forgings struggle to meet both classification society certification and long service life requirements in terms of toughness matching and grain size control. In addition, the supplier previously cooperating with this client often encountered internal looseness and segregation defects during the forging of complex special-shaped shaft sections, which affected subsequent machining pass rates. Due to the tight shipbuilding cycle, delivery delays for shaft forgings directly hinder the delivery of the entire ship. Customers urgently need a forging supplier with stable process capabilities and strict supply according to specific milestones.
To address these pain points, Jianing Forging adopts a combination of multi-directional forging and strictly controlled forging ratios to effectively break up coarse cast structures and improve internal density and isotropy of forgings. On the material side, based on the customer's required corrosion resistance grade, marine steel grades with optimized alloy ratios are selected, combined with normalizing + tempering heat treatment specifications, ensuring shaft forgings maintain sufficient impact toughness while achieving good strength. In terms of dimensions, by utilizing precision forging molds and process dimensional monitoring systems, machining allowances at key parts are controlled within industry-standard tolerance zones, reducing customers' subsequent processing volumes. At the same time, Jianing Forging has established a dedicated project team with node-based control throughout the entire process, from billet production scheduling to finished product inspection, which helps ensure continuity and traceability of batch deliveries and helps customers maintain a stable ship assembly rhythm.
