347 stainless steel is a niobium-stabilized austenitic grade used in applications where stabilization against sensitization is part of the material-selection strategy. For rolled rings, it may be specified for thermal equipment, welded process assemblies and components exposed to elevated-temperature service. The exact design temperature, welding details and material standard determine whether 347 is the appropriate choice.
347 and 321 are both stabilized grades, but their stabilizing additions differ. 316L is commonly selected for its molybdenum-related corrosion advantage, while 347 is often chosen for its specified thermal and fabrication characteristics. These grades are not interchangeable by default. The design engineer should approve substitutions against the actual service conditions.
The preform is expanded through ring rolling to obtain the required annular dimensions. A ring can be supplied with machining stock or finished to a drawing. Specify the cross-section, rolling dimensions, final dimensions and any requirements for grain structure or supplementary testing stated in the governing product standard.
If the ring will be welded into a larger assembly, provide the joining specification and any post-weld heat-treatment or examination requirements. Stabilization does not remove the need for a qualified welding procedure or appropriate inspection. Identify weld preparation surfaces and machining allowances on the drawing.
State chemistry, mechanical tests, heat-treatment condition, traceability, dimensional inspection and any NDT. For high-temperature service, include the applicable design code and supplementary requirements. A complete RFQ includes drawing, quantity, material standard, operating conditions, finish and documentation.
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.
