Pure Iron Supplier | High-Purity Iron For Sale (2N–6N)
Why Pure Iron from Huaxiao-Alloy
Huaxiao-Alloy supplies industrial pure iron and high-purity iron from 2N to 6N (Fe ≥ 99.0%–99.9999%), covering R&D to mass production. With tight impurity control, consistent batch quality, and flexible forms (ingot, cathode, shots, powder, plate/strip/wire/bar), our materials serve electronics, magnetic components, vacuum metallurgy, sputtering/evaporation, precision machining, and chemical/analytical uses.
Key advantages
Purity span 2N–5N with trace elements controlled to ppm level (grade-specific)
Stable magnetic behavior (high μr, low coercivity; Curie temp ~770 °C)
Excellent formability (annealed states, low C/S/P)
Reliable characterization (ICP-OES/ICP-MS chemistry; O/N/H by inert-gas fusion; batch COA)
1. Purity Grades (Speak Clearly about 4N & 5N)
N-rating = number of “9”s in Fe purity.
3N = 99.9%; 4N = 99.99%; 5N = 99.999%.
1) Grade Definition & Typical Control Windows
| Purity grade | Fe (min, %) | Total metallic impurities (typ.) | O / N / H (typ.) | Typical applications |
|---|---|---|---|---|
| 2N | 99.0 | ≤10,000 ppm | O/N/H as-produced | General smelting, alloy making, chemical use |
| 3N | 99.9 | ≤1,000 ppm | O ≤300 ppm, N ≤100 ppm, H ≤10 ppm | Magnetic parts, bases for alloys, lab use |
| 4N | 99.99 | ≤100 ppm | O ≤100 ppm, N ≤30 ppm, H ≤5 ppm | High-end magnetic shielding, precision cores, electronic parts |
| 5N | 99.999 | ≤10 ppm | O ≤20 ppm, N ≤10 ppm, H ≤3 ppm | Semiconductor/evaporation sources, sputtering targets, advanced R&D |
Notes: Exact impurity caps (e.g., C, S, P, Si, Mn, Cu, Ni, Cr, Al, Ti, V) can be fixed to your print/spec. We provide batch COA and can align to customer ppm limits for 4N/5N programs.
2) Typical Element Caps by Grade (reference windows)
4N:
C ≤ 20 ppm, S ≤ 10 ppm, P ≤ 10 ppm, Si ≤ 20 ppm, Mn ≤ 20 ppm; Cu/Ni/Cr/Al each typically ≤10–20 ppm5N:
C ≤ 5–10 ppm, S ≤ 5 ppm, P ≤ 5 ppm, Si ≤ 10 ppm, Mn ≤ 10 ppm; Cu/Ni/Cr/Al each ≤5–10 ppm
Final acceptance values follow your drawing/spec (we can match ultra-trace targets for 5N programs).
2. Forms, Dimensions & Supply Conditions of Pure Iron
Forms
Ingot / Cathode / Blocks
Shots / Granules (common for 3N–5N dosing; typical 1–10 mm)
Powder (gas- or water-atomized; D50 on request)
Plate / Sheet / Strip / Foil
Bar / Rod / Wire / Profiles
Sputtering / Evaporation Targets (bonded or monolithic, backing plate options)
Typical dimensions (customizable)
Plate/Sheet: 0.3–30 mm thickness; width ≤ 1200 mm
Strip/Foil: 0.02–1.0 mm thickness; slit-to-width service
Bar/Rod: Ø3–200 mm
Wire: Ø0.1–8 mm
Shots/Granules: 1–10 mm nominal; tight sieve ranges available
Targets: Planar/Rotatable; 99.95–99.999% purity options; bonding service
Delivery states
As-cast / Hot-rolled / Cold-rolled
Annealed (magnetic grade) / Vacuum-annealed for ultra-low gas content
Packaging
Vacuum bag + desiccant, inert-gas sealed (grade-dependent)
Clean room packing for 4N/5N targets/foils; lot traceability & COA
3. Physical & Magnetic Properties of Pure Iron
Density: 7.87 g/cm³
Melting point: 1538 °C
Curie temperature: ~770 °C (ferromagnetic below Tc)
Electrical resistivity (20 °C): ~10 µΩ·cm
Relative permeability (μr): high (grade/process dependent)
Coercivity: low (annealed soft-magnetic conditions)
For electromagnetic parts, we can supply low-coercivity and high-permeability states through controlled cold work + anneal.
4. Applications of Pure Iron by Grade
2N–3N Pure Iron
Alloying base iron, metallurgical/chemical feedstock
General magnetic parts, lab and educational use
4N Pure Iron
Magnetic shielding housings, precision laminations and yokes
Relay/solenoid parts, precision pole pieces
Sensor components, precision machining for electronics
5N Pure Iron
PVD sputtering & evaporation (Fe targets/sources)
Semiconductor/RF process hardware, ultra-clean R&D
Standard references (analytical), ultra-low-impurity alloy development
5. Quality & Inspection of Pure Iron
Chemical analysis: ICP-OES/ICP-MS with multi-element profiling
Gas analysis: O/N/H by inert gas fusion (LECO)
Microstructure & inclusion: optical/SEM (on request)
Magnetic properties: coercivity, permeability testing (on request)
Dimensional & surface: per drawing; roughness measurement for foils/targets
6. Recommended Selections of Pure Iron
Cost-effective: 3N Shots/Granules for alloying feeds
Magnetic parts: 4N Plate/Strip (annealed) for high μr & low Hc
Ultra-clean processes / PVD: 5N Targets, 5N Shots (narrow sieve, low O/N/H)
Precision foil: 4N–5N Foil with vacuum packing for lab/electronics
7. Ordering Guide of Pure Iron
Please share:
Purity grade (2N/3N/4N/5N)
Form & size (e.g., 0.2 mm strip × 300 mm; Ø25 mm × 300 mm rod; 3–5 mm shots)
Impurity caps (element ppm limits if any) & O/N/H targets
Delivery state (as-rolled / annealed / vacuum-annealed)
Application & test items (we align test plan & COA accordingly)
Pure iron has minimal alloying and ultra-low C/S/P, giving predictable magnetic behavior and cleaner chemistry. Low-carbon steel still contains C and alloying elements, so its magnetic and chemical purity differs from 4N/5N iron.
Yes. It is ferromagnetic below ~770 °C and offers high relative permeability and low coercivity when properly annealed.
Choose 5N for PVD/semiconductor or ultra-trace analytical scenarios where total metallic impurities ≤10 ppm and very low O/N/H are required. 4N suits most high-end magnetic and electronic parts.
Yes—planar or rotatable targets, bonded or monolithic, with 4N–5N purities and backing plate options. Full COA + packing for cleanroom delivery.
Yes. Each lot ships with COA. Third-party tests can be arranged per your PO.
Looking for a reliable Pure Iron (4N/5N) supplier?
Email: export@huaxiao-alloy.com
Tell us your purity, form, size, impurity caps, and end-use, and we’ll quote with lead time and test plan the same day.
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