Core Concept: Precision Starts with Purity

Foundry-grade pure iron lumps (2N-4N purity) are ultra-refined iron billets engineered to serve as the foundational material for high-integrity castings. Unlike conventional foundry pig iron (typically ≤99.9% pure with 3.5–4.5% carbon and trace impurities), these lumps undergo advanced purification processes to achieve >99.95% Fe (4N grade). This eliminates detrimental trace elements (As, Sn, Sb, Bi, Pb, etc.) that cause brittleness, porosity, and fatigue failure in critical cast components.

Metallurgical Process Flow

Raw Iron Ore → Pre-refining → "Triple Refining" → Vacuum Decarburization → Electroslag Remelting → Controlled Solidification

The Imperative of Ultra-Low Impurity Levels

Our lumps mitigate these risks through:

Carbon (C) ≤0.02%: Prevents carbide precipitation in heat-treated alloys.

Sulfur (S) ≤0.005%: Eliminates hot shortness in steel castings.

Phosphorus (P) ≤0.015%: Maintains ductility at cryogenic temperatures.

Key Advancements:

- Deep desulfurization (<0.005% S via Mg-Ca injection)

- Vacuum oxygen decarburization (VODC) reducing C to 0.002%

- Trace element segregation using directional solidification

Applications: Where Purity Creates Value

Sector	Component	Performance Gain
Energy	Nuclear waste containers	Zero radiation-leak defects
Transport	High-speed train bogies	Fatigue life ↑ 40% (EN 1563 standard)
Heavy Machinery	Ship diesel engine blocks	Thermal fatigue resistance ↑ 25%
Defense	Tank transmission housings	Ballistic impact toughness ↑ 30%

Data source: Industrial case studies

Specifications: Foundry-Grade Pure Iron Lumps

Parameter	Standard Value	Premium 4N Grade
Fe Purity	≥99.80%	≥99.95%
C	≤0.040%	≤0.015%
S	≤0.025%	≤0.005%
P	≤0.020%	≤0.010%
Trace Elements	≤0.100%	≤0.025%
Form	8–12 kg lumps	10–15 kg lumps