High Purity Iron (4N Grade) Supplier
High Purity Iron (4N grade, Fe ≥ 99.99%) is a premium form of pure iron with extremely low levels of carbon, sulfur, phosphorus, and metallic impurities. Compared with industrial pure iron (2N–3N), 4N grade offers tighter impurity control, lower gas content (O/N/H), and superior magnetic performance.
Huaxiao-Alloy is a professional high-purity iron supplier, delivering 4N iron in a wide range of forms such as ingots, plates, strips, foils, wires, rods, granules, and sputtering targets. With strict quality assurance and global export experience, our materials are widely used in electronics, magnetic shielding, precision instruments, and advanced industrial applications.
1. Typical Chemical Composition (Reference Range, ppm) of 4N High Purity Iron
Huaxiao-Alloy offers of 4N High Purity Iron.
| Grade | Fe (min, %) | C (max) | S (max) | P (max) | Si (max) | Mn (max) | O (max) | N (max) | H (max) | Other elements |
|---|---|---|---|---|---|---|---|---|---|---|
| 4N | ≥ 99.99 | ≤ 20 | ≤ 10 | ≤ 10 | ≤ 20 | ≤ 20 | ≤ 100 | ≤ 30 | ≤ 5 | Each ≤ 10–20 ppm |
(Exact impurity levels can be adjusted per customer requirements. A certificate of analysis (COA) is provided with every batch.)
2. Product Forms & Supply Range of 4N High Purity Iron
Ingots / Blocks – raw material for R&D and industrial processing
Plates / Sheets / Strips – thickness 0.1–20 mm, width up to 1000 mm
Foils – 0.02–0.1 mm, vacuum-packed for clean applications
Bars / Rods – Ø 3–100 mm
Wires – Ø 0.1–5 mm
Granules / Shots – 1–5 mm, ideal for alloying and PVD feedstock
Sputtering Targets – planar or rotatable, bonded or monolithic
Surface finish: polished, hot-rolled, cold-rolled
Delivery condition: annealed or vacuum-annealed
Packaging: vacuum-sealed, inert gas protection, cleanroom packing available
3. Key Properties of 4N Iron
Ultra-high purity (99.99%) – stable and reliable chemistry
Excellent magnetic performance – high permeability, low coercivity
Low gas content – O, N, H controlled for electronic and PVD applications
Good ductility – suitable for precision machining and forming
Predictable behavior in high-end applications
4. Applications of High Purity Iron (4N)
Electronics & Electromagnetic Industry
Used in transformer cores, magnetic shielding components, relay parts, and sensors requiring high magnetic stability.
Advanced Magnetic Materials
Applied in low-coercivity and high-permeability parts, precision laminations, and shielding housings.
PVD & Thin Film Technology
Supplied as sputtering targets and evaporation sources, ensuring low contamination and stable film deposition.
Precision Instruments & Research
Utilized in scientific equipment, laboratory standards, and alloy development where ultra-clean iron is essential.
5. Why Choose Huaxiao-Alloy 4N Iron
ISO-certified quality control – impurity control down to ppm level
Versatile supply – ingots, foils, granules, targets, and custom machining
Global export experience – serving electronics, aerospace, and research sectors
Technical support – material selection, processing advice, and packaging solutions
Flexible customization – sizes, shapes, and impurity limits per request
4N iron contains Fe ≥ 99.99%, with total metallic impurities ≤100 ppm and low gas content (O ≤100 ppm, N ≤30 ppm, H ≤5 ppm).
3N (99.9%) is used in metallurgy and general magnetic parts. 4N (99.99%) offers much tighter impurity control and is preferred for electronics, shielding, and thin-film applications.
Yes. We supply 4N iron sputtering targets (planar and rotatable) with custom bonding options, vacuum packaging, and COA.
Yes. It is ferromagnetic below 770 °C with excellent permeability and low coercivity, making it ideal for high-precision magnetic components.
Yes. We provide custom cutting, machining, and processing for plates, foils, wires, and targets according to customer drawings.
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