Lower Clad Tube Sheet Forging
Lower Clad Tube Sheet Forging refers to a specialized manufacturing process used in the production of critical pressure boundary components for nuclear and high-performance industrial heat exchangers. As a key structural element located at the bottom of vertical shell-and-tube heat exchangers or steam generators, the lower clad tube sheet serves dual functions: it provides mechanical support for the tube bundle while acting as a primary pressure-retaining barrier between primary and secondary coolant circuits.
The forging process begins with selecting high-integrity alloy ingots—typically low-alloy steel such as ASTM A105 or SA-508 Grade 3, clad on the primary side with corrosion-resistant stainless steel or nickel-based alloys like Alloy 690 or 309L. Cladding is achieved either through explosive bonding prior to forging or via hot roll cladding followed by integrated thermo-mechanical processing. This ensures metallurgical continuity and eliminates interfacial defects that could compromise long-term integrity under irradiation and thermal cycling.
Precision forging is then carried out under strictly controlled temperature and strain-rate conditions. Multi-directional forging—comprising radial, axial, and rotational deformation—is employed to refine grain structure, close internal porosity, and achieve uniform through-thickness properties. The resulting microstructure exhibits fine, equiaxed grains with enhanced toughness and resistance to stress corrosion cracking, meeting stringent requirements of ASME Section III, Division 1, and regulatory standards set by nuclear safety authorities.
Post-forging operations include heat treatment (normalizing and tempering), non-destructive examination (ultrasonic testing, dye penetrant inspection), dimensional verification, and surface machining to precise tolerances. Each forging undergoes full material traceability and certification, with documented records of chemical composition, mechanical test results, and inspection reports.
In summary, Lower Clad Tube Sheet Forging represents a convergence of advanced metallurgy, precision engineering, and rigorous quality assurance. Its successful execution directly influences the operational safety, service life, and reliability of nuclear power plant systems—making it not merely a component, but a cornerstone of nuclear-grade equipment integrity.
We also provide forging blanks and CNC precision machining services for our clients, covering industries such as energy, petrochemicals, steel, engineering machinery, plastics, prevention and control, hydraulics, healthcare, and food. Please feel free to send us drawings for inquiries.
Metalworking Services
CNC Machining
Sheet Metal Fabrication
Metal Welding
Metal Cutting
Metal Bending
Metal Punching
Metal Forging
Metal Sheet Rolling
Tube and Plate Drilling
Our heavy-duty forging presses support open-die forging and deformation of large-section forgings, including discs, shafts, blocks, and custom components. This capability enables us to meet the demanding forming requirements of heavy industrial applications.
Heat treatment is a critical step in achieving the mechanical properties required for heavy-duty forgings. Our process capabilities meet the strength, toughness, and structural stability requirements for forged components used under demanding operating conditions.
We offer machining capabilities for large forged shafts and long cylindrical components, supporting both rough and finish machining. This capacity is suitable for stepped shafts, rotor shafts, rollers, and other heavy-duty forged shaft components.
Our machining facilities are capable of handling large ring-shaped forgings and circular parts that require precise turning, face machining, boring, and contour control. This capability is suitable for industrial ring blanks, heavy-duty circular parts, and machined ring forgings.
We offer machining solutions for heavy-duty cylindrical, hollow, and tubular forgings. This capability supports the machining of sleeves, cylinders, and other thick-walled forged components used in pressure vessels, rotating systems, and general industrial applications.
Quality control is integrated into our production process through the inspection and testing of forged and machined parts. Our capabilities help verify the dimensional accuracy, condition, and quality consistency of industrial forgings prior to delivery.
Finished forgings are properly protected and packaged to minimize the risk of damage during storage and transportation. Our packaging methods ensure the safe domestic delivery and export shipment of machined and high-value forged components.
