Ferritic Hollow Rod 430/444/409

• Seamless ferritic hollow rod series: 409, 430, 444, manufactured to ASTM A789 / EN 10294 standard for machining blanks
• Nickel-free low-cost ferritic formula, much more economical than 304 / 316L austenitic hollow tube
• Fully magnetic under all delivery states, low thermal expansion & high thermal conductivity for heat exchange components
• 409 Ti-stabilized grade with outstanding high-temperature oxidation for automotive exhaust tubular parts
• 430 general ferritic grade with good polishability for appliance & decorative hollow blanks
• 444 molybdenum-titanium modified grade, superior chloride pitting resistance for freshwater & solar equipment
• No chloride stress corrosion cracking (SCC) risk, stable service in warm brine medium
• Custom OD, ID, wall thickness, fixed length & full CNC boring/machining per CAD drawings

This series of ferritic seamless hollow rods are produced by hot extrusion + cold drawing forming process, fully annealed after forming to obtain soft single ferritic microstructure without austenite phase. Without expensive nickel element, the raw material cost is significantly lower than nickel-containing stainless steel.

Three grades cover diversified working scenarios: 409 is optimized for automobile exhaust high-temperature pipeline; 430 serves household appliances, architectural decoration and mild corrosion equipment; molybdenum-alloyed 444 solves freshwater, solar heat exchanger chloride pitting problems that ordinary ferritic steel cannot handle. Seamless hollow rod eliminates heavy deep boring processing of solid bar, widely used in auto exhaust pipes, solar water heater heat exchange tubes, HVAC equipment blanks, household appliance hollow structural parts and light chemical pipeline components.

Low chromium titanium-stabilized ferritic steel, excellent anti-oxidation performance at exhaust working temperature, good thermal fatigue resistance, low price, ideal blank for automotive exhaust manifolds, EGR tubular fittings and muffler support hollow rods.

17Cr universal ferritic grade, good atmospheric corrosion resistance and mirror polishing performance, stable in dry environment, suitable for home appliance frame, decorative tubular parts and low-temperature heating equipment hollow blanks.

Molybdenum & titanium dual stabilized ferritic stainless steel. High PRE value greatly improves chloride pitting resistance, resistant to warm water brine, perfect for solar heat exchanger, desalination small pipeline and water treatment equipment hollow rod stock.

• Ferritic Stainless Steel: 409, 430, 439, 444
• Martensitic Stainless Steel: 410, 420, 431, 440C
• Austenitic Stainless Steel: 304, 316L, 321, 347, 904L
• Duplex Stainless Steel: 2205, 2507, S32750, F51
• PH Stainless Steel: 17-4PH, 15-5PH, 17-7PH
• Nickel Alloys: Monel400/K500, Incoloy825, Inconel625, Hastelloy C276
• Alloy & Carbon Steel: A105, 4140, F22, F91

1. Nickel-Free Cost Advantage
   Zero nickel alloy composition greatly reduces raw material cost, ideal for mass-production exhaust & household tubular products.
2. Superior Thermal Performance
   Higher thermal conductivity, lower thermal expansion coefficient than austenitic steel, less thermal deformation under cyclic heating heat exchange equipment.
3. Anti-Chloride SCC Characteristic
   Ferritic matrix avoids stress corrosion cracking failure in warm brine, which is a common defect of 304 stainless hollow tube.
4. Grade Targeted Corrosion Matching
   409 for high-temp exhaust; 430 for decoration & appliances; 444 for freshwater/chloride medium, one-stop grade selection.
5. Good Machinability After Annealing
   Fully annealed soft state, easy inner hole boring, turning, threading and all CNC machining operations.

• 409: Automotive exhaust hollow rods, EGR pipeline blanks, muffler support tubular parts
• 430: Household appliance frame tubes, decorative handrail hollow stock, low-temperature furnace pipes
• 444: Solar water heater heat exchange tubes, fresh water desalination hollow blanks, cooling water pipelines
• General: HVAC heat exchanger hollow rod, waste gas low-temp pipeline, light chemical equipment tubular blanks

We provide integrated hot extrusion & cold drawing seamless hollow rod production, full CNC machining per customer CAD/PDF drawings:

• Custom fixed-length cutting, facing, chamfering, inner & outer diameter turning
• Precision boring, grooving, drilling, threading, internal grinding
• Full annealing & stress relief heat treatment customization
• Surface pickling, passivation, bright annealing finishing treatment

We supply ferritic seamless hollow rod 409/430/444 for auto, solar, HVAC and household appliance global clients.

• Eddy Current + UT dual inspection to detect internal wall defects of seamless hollow rod
• Full batch tensile & hardness mechanical performance testing
• High-precision calipers to control OD / ID / wall thickness tolerance
• Spectrometer full spectrum chemical composition analysis per heat lot
• Metallographic ferritic single-phase microstructure inspection

Mill Test Certificate EN 10204 3.1 can be issued and delivered with shipment documents before delivery.

• Inner: Plastic end caps + waterproof anti-rust polybag to protect inner bore & outer surface
• Outer: Reinforced fumigated wooden pallet with separation strips to avoid tube collision
• Custom heavy-duty export packaging available upon customer request

Normally 10 – 45 working days after advance payment receipt. Exact lead time depends on OD/ID wall size, order quantity and custom machining demands.