Martensitic Stainless Steel Shaft 410 / 420 / 431 / 440C
Product Details
| Grade: | 410, 420, 431, 440C | Standards: | ASTM A276 / A479 EN 10088-3 / JIS G4303 |
|---|---|---|---|
| Dia (mm): | 6 – 300 (standard) Custom Up To 500 | Length (mm): | 1000 – 6000 (standard) Custom Lengths Available |
| Surface: | Black (hot-rolled/forged) / Peeled Turned / Ground / Polished Centerless Ground | Delivery Conditions: | Hot Rolled / Cold Drawn & Pierced, Solution Annealed (Condition A), Stress‑Relieved, Pickled |
Product Description
- Full series martensitic solid round shaft: 410, 420, 431, 440C, comply with ASTM A276 bar manufacturing standard
- All grades hardenable via quenching + tempering for adjustable hardness & outstanding wear resistance
- Nickel-free low-cost alloy formula, fully magnetic in all heat treatment conditions
- 410 low-carbon grade for general low-load mechanical spindle blanks
- 420 medium carbon grade balanced hardness & mild corrosion for tool & instrument shafts
- 431 nickel-modified martensite with superior toughness for high-pressure hydraulic spindles
- 440C high carbon molybdenum variant, max HRC58–62 after heat treatment for precision bearing stock
- Hot rolled & cold drawn precision stock, custom diameter/length + full CNC turning, threading, grooving per CAD drawings
This series martensitic stainless solid shafts are produced through hot rolling and cold drawing forming process. The standard factory supply state is fully soft annealed for easy CNC machining; customers can conduct custom quenching and tempering heat treatment to reach target hardness values.
Without expensive nickel elements, martensitic shafts hold prominent cost advantages over austenitic stainless bar. Four grades are classified by carbon and nickel content to match different industrial load & wear demands: low-carbon 410 for ordinary machinery spindles; medium-carbon 420 for cutting tool and instrument blanks; nickel-containing 431 for high-pressure hydraulic shafts; ultra-high carbon 440C for precision bearing and wear-resistant fixture cores. Widely machined into pump spindles, valve stems, mold ejector shafts, bearing mandrels and mechanical transmission shafts for mold, hydraulic, petrochemical and general machinery industries.
Low-carbon 13Cr basic martensitic steel. Soft after full annealing with excellent machinability; moderate hardness after quenching & tempering. Suitable for low-load pump shafts, general valve spindles and dry mechanical rotating parts with weak corrosive atmosphere.
Medium-carbon martensitic stainless steel with higher hardening capacity than 410. Balanced wear resistance and mild anti-rust property, ideal mold core shafts, surgical instrument spindles and hardware tool blanks.
Nickel-added martensitic grade. Extra nickel greatly improves impact toughness under cyclic heavy pressure, perfect for high-pressure hydraulic cylinder shafts and heavy-duty valve rotating components.
Highest carbon martensite with molybdenum additive. Achieves up to HRC62 after quenching & tempering with extreme abrasion resistance, premium raw material for precision bearing shafts and wear measuring fixtures.
| Grade | EN No. | C | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | Mo | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 410 | 1.4006 | 0.08–0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 11.5–13.5 | ≤0.75 | — | Balance | |
| 420 | 1.4021 | 0.16–0.40 | 1.00 | 1.00 | 1.00 | 0.040 | 0.030 | 12.0–14.0 | ≤0.75 | — | Balance |
| 431 | 1.4057 | 0.12–0.22 | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–17.0 | 1.25–2.50 | — | Balance | |
| 440C | 1.4125 | 0.95–1.20 | 1.00 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0–18.0 | ≤0.75 | 0.40–0.70 | Balance |
| Property | 410 | 420 | 431 | 440C |
|---|---|---|---|---|
| Delivery Condition | Hot Rolled / Cold Drawn, Fully Annealed, Stress‑Relieved, Pickled | |||
| Min Tensile Strength (MPa) | ≥415 | ≥655 | ≥620 | ≥760 |
| Min 0.2% Yield Strength (MPa) | ≥205 | ≥345 | ≥390 | ≥420 |
| Min Elongation (50mm gauge) | ≥20% | ≥25% | ≥12% | ≥12% |
| Max Brinell Hardness (Annealed) | ≤207 HB | ≤241 HB | ≤255 HB | ≤269 HB |
- Martensitic Stainless Steel: 410, 420, 431, 440A, 440B, 440C, 416
- Ferritic Stainless Steel: 409, 430, 439, 444
- Austenitic Stainless Steel: 304, 304L, 316L, 321, 904L
- Duplex Stainless Steel: 2205, 2507, S32750, F51
- PH Stainless Steel: 17-4PH, 15-5PH, 17-7PH
- Nickel Alloys: Monel400/K500, Inconel600/625/718, Hastelloy C276
- Alloy & Carbon Steel: A105, 4140, F22, F91
No expensive nickel element, far lower raw material cost than nickel-bearing austenitic bars for dry & mild corrosive working environments.
All grades can be hardened after CNC processing; 440C reaches HRC58–62 for extreme wear-resistant spindle parts.
Magnetic under all heat treatment states, ideal magnetic mechanical shafts and fixture blanks.
410 general machinery, 420 tool hardware, 431 high-pressure hydraulics, 440C precision bearings for one-stop material selection.
Soft fully annealed delivery state, easy turning, boring, threading and all complex CNC operations.
- 410: Low-load pump spindles, general valve stems, light machinery transmission shafts
- 420: Mold ejector shafts, surgical instrument spindles, kitchen hardware rotating parts
- 431: High-pressure hydraulic cylinder rods, heavy-duty pump shafts, marine valve spindles
- 440C: Precision bearing mandrels, wear measuring tool shafts, high-load mold core blanks
- General: Gear shafts, nozzle pins, oilfield small rotating tubular components
We provide integrated hot rolling & cold drawn solid shaft production, full custom CNC processing per customer CAD/PDF drawings:
- Custom fixed-length cutting, facing, centering, external turning & chamfering
- Precision threading, spline machining, cylindrical grinding & mirror polishing
- Custom quenching & temper heat treatment service for target HRC hardness
- Surface pickling, passivation anti-rust finishing treatment
We supply martensitic solid stainless shafts for mold, hydraulic, petroleum and general machinery global industrial clients.
- 100% UT & Eddy Current dual inspection to detect rolling internal segregation & crack defects
- Full batch tensile, yield & hardness mechanical testing per heat lot
- High-precision micrometer to control diameter & straightness tolerance
- Spectrometer full spectrum chemical composition analysis verification
- Metallographic martensite microstructure inspection after hardening heat treatment
Mill Test Certificate EN 10204 3.1 can be issued and delivered together with shipment documents before delivery.
- Inner: Independent plastic anti-rust sleeve + waterproof film full wrap for surface scratch protection
- Outer: Reinforced fumigated wooden pallet with separation strips to avoid bending deformation
- Custom heavy-duty export packaging for long large-diameter shafts available upon request
Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on diameter, length, order quantity and custom heat treatment/machining demands.
Product Highlights
Product Highlights Full series martensitic solid round shaft: 410, 420, 431, 440C, comply with ASTM A276 bar manufacturing standard All grades hardenable via quenching + tempering for adjustable hardness & outstanding wear resistance Nickel-free low-cost alloy formula, fully magnetic in all heat ...
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