Product Highlights
- Full series ferritic solid round shaft: 409, 430, 439, 444, produced per ASTM A27 bar standard
- Nickel-free low-cost ferritic alloy, far lower material cost than 304/316L austenitic steel
- 100% magnetic under all delivery states, higher thermal conductivity & low thermal expansion coefficient
- 409 Ti-stabilized grade for automotive exhaust high-temperature anti-oxidation spindle blanks
- 430 general ferritic grade for household & decorative mechanical shaft stock
- 439 titanium stabilized, eliminates welding intergranular corrosion for thermal equipment spindles
- 444 molybdenum-containing grade with superior chloride pitting resistance for freshwater & solar equipment
- No chloride stress corrosion cracking (SCC) risk in warm brine environments
- Hot rolled & cold drawn precision stock, custom diameter/length + full CNC turning, threading per CAD drawings
Product Overview
This series ferritic stainless solid shafts are manufactured via hot rolling + cold drawing forming, then fully air-annealed to obtain uniform single ferritic microstructure. Without expensive nickel element, the raw material cost is greatly reduced compared to nickel-bearing stainless steel.
Four grades cover diverse industrial working scenarios: Low-chromium Ti-stabilized 409 is dedicated to automobile exhaust high-temperature spindles; standard 430 for household appliances and decorative rotating parts; Ti-alloyed 439 avoids sensitization after long thermal cycles for furnace equipment; Mo-added 444 solves freshwater chloride pitting problems. Ferritic shafts never generate SCC failure in hot salt water, a key advantage over austenitic stainless steel. Widely machined into exhaust spindles, heat exchanger rods, water heater shafts and light mechanical transmission blanks for auto, HVAC, solar and household appliance industries.
Material Grade Characteristics
409 (UNS S40900)
Low chromium titanium stabilized ferritic steel, outstanding high-temperature oxidation resistance, excellent thermal fatigue performance, low price, ideal muffler and EGR tubular spindle blanks for vehicle exhaust systems.
430 (UNS S43000 / 1.4016)
17Cr universal ferritic grade, stable in atmospheric & dry environments, good polishing property, suitable kitchen equipment, decorative support shafts and low-load mechanical spindles.
439 (UNS S43035 / 1.4510)
Titanium added to bind free carbon, completely avoid intergranular corrosion after welding; better ductility than 430, perfect furnace roller shafts and heat circulation equipment spindles.
444 (UNS S44400)
Molybdenum & dual stabilized ferritic stainless steel, high PRE value, remarkable anti-pitting performance in tap water & low-concentration brine, substitute 316L for solar heat exchanger shafts and desalination small spindles.
Chemical Composition (Weight %)
| Grade |
EN No. |
C ≤ |
Si ≤ |
Mn ≤ |
P ≤ |
S ≤ |
Cr |
Ni ≤ |
Mo |
Ti |
Fe |
| 409 |
— |
0.08 |
1.00 |
1.00 |
0.045 |
0.045 |
10.5–11.5 |
0.50 |
— |
0.15–0.50 |
Balance |
| 430 |
1.4016 |
0.12 |
1.00 |
1.00 |
0.040 |
0.030 |
16.0–18.0 |
0.75 |
— |
— |
Balance |
| 439 |
1.4510 |
0.03 |
1.00 |
1.00 |
0.040 |
0.030 |
17.0–19.0 |
0.50 |
— |
0.15–0.80 |
Balance |
| 444 |
— |
0.025 |
1.00 |
1.00 |
0.040 |
0.030 |
17.5–19.5 |
1.00 |
1.75–2.50 |
0.10–0.60 |
Balance |
Mechanical Properties (Fully Annealed, ASTM A276)
| Property |
409 |
430 |
439 |
444 |
| Delivery Condition |
Hot Rolled / Cold Drawn, Fully Annealed, Stress‑Relieved, Pickled |
| Min Tensile Strength (MPa) |
≥360 |
≥450 |
≥415 |
≥415 |
| Min 0.2% Yield Strength (MPa) |
≥175 |
≥205 |
≥205 |
≥275 |
| Min Elongation (50mm gauge) |
≥25% |
≥22% |
≥22% |
≥20% |
| Max Brinell Hardness |
≤179 HB |
≤183 HB |
≤179 HB |
≤183 HB |
Related Material Grades
- Ferritic Stainless Steel: 409, 430, 439, 444
- Martensitic Stainless Steel: 410, 420, 431, 440C
- Austenitic Stainless Steel: 304, 304L, 316L, 321, 904L
- Duplex Stainless Steel: 2205, 2507, S32750
- PH Stainless Steel: 17-4PH, 15-5PH
- Nickel Alloys: Monel400/K500, Inconel600/625/718, Hastelloy C276
- Alloy & Carbon Steel: A105, 4140, F22, F91
Key Advantages
-
Nickel-Free Cost Advantage
No expensive nickel element, greatly cut raw material cost compared to nickel-containing austenitic shafts for dry & freshwater equipment.
-
Excellent Thermal Performance
Higher thermal conductivity, lower thermal expansion than 304/316L, less deformation under cyclic heating for furnace & exhaust spindles.
-
Anti-SCC Characteristic
Ferritic matrix avoids chloride stress corrosion cracking which frequently occurs on 304 stainless in warm brine.
-
Grade Targeted Corrosion Matching
409 for auto exhaust; 430 for decoration; 439 welded thermal parts; 444 freshwater chloride service, one-stop grade selection.
-
Stable Soft Annealed Machinability
Fully air-annealed soft state, easy turning, threading, grooving and all CNC precision machining processes.
Typical Applications
- 409: Automobile exhaust spindle blanks, muffler shafts, EGR heat shield rods
- 430: Water heater support spindles, kitchen equipment shafts, decorative rotary parts
- 439: Industrial furnace roller shafts, dryer transmission spindles, exhaust system rods
- 444: Solar heat exchanger shafts, fresh water treatment pump spindles, desalination small rods
- General: HVAC heat exchange spindles, low-temperature waste gas equipment shafts
Processing Service
We provide integrated hot rolling & cold drawn solid shaft production, full custom CNC processing per customer CAD/PDF drawings:
- Fixed-length cutting, facing, centering, external turning & chamfering
- Precision threading, spline machining, cylindrical grinding & mirror polishing
- Full air annealing & stress relief heat treatment customization
- Surface pickling, passivation bright finishing treatment
We supply ferritic solid shafts for automotive, solar, HVAC and household appliance global industrial clients.
Quality Assurance
- 100% UT & Eddy Current inspection for rolling segregation & surface crack defects
- Full batch tensile, yield & hardness mechanical performance testing per heat lot
- High-precision micrometer to control diameter & straightness tolerance
- Spectrometer full spectrum chemical composition analysis verification
- Metallographic single ferritic microstructure inspection
Mill Test Certificate EN 10204 3.1 can be issued and delivered with shipment documents before delivery.
Packing & Delivery
Packing
- Inner: Individual anti-rust plastic sleeve + waterproof film full wrap
- Outer: Reinforced fumigated wooden pallet with separation strips to prevent scratch & bending
- Custom heavy-duty export packaging for extra long shafts available upon request
Lead Time
Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on diameter, length, order quantity and custom machining demands.
