|
SPE Cont. |
S ≥ |
FE ≥ |
SI ≤ |
AS ≤ |
P ≤ |
C ≤ |
PB ≤ |
H2O ≤ |
SIZE ≥ |
|
S48 |
48% |
43% |
3.0% |
0.01% |
0.01% |
0.8% |
0.15% |
0.5% |
95% |
|
S45 |
45% |
40% |
5.0% |
0.01% |
0.01% |
0.8% |
0.15% |
1.0% |
95% |
|
SIZE |
(3-8)mm/(3-15)mm/(10-50)mm or other size |
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|
PKG |
25kg/500kg/1000kg/bag or other packing |
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Core Functions of High‑Grade Pyrite as Sulfur Additive in Smelting and Casting
Improving Machinability (Primary Function)
Sulfur forms MnS (manganese sulfide) inclusions in the iron matrix, distributed as spherical or spindle‑shaped particles, which act as chip breakers to make chips easy to break and prevent sticking to tools.
It reduces friction between tools and workpieces, increases cutting speed, extends tool life, and improves surface finish, especially suitable for free‑cutting steel, cast iron, and stainless steel.
Enhancing Casting Performance (Gray Iron, Ductile Iron)
Sulfur is a graphitizing element that promotes graphite precipitation in cast iron, refines graphite morphology, reduces chill tendency, and improves fluidity and mold‑filling ability of castings.
It lowers casting hardness, improves machinability, and prevents cracking and shrinkage porosity in castings.
Optimizing Microstructure and Mechanical Properties
Appropriate sulfur content (0.08%–0.15%) refines grains, homogenizes the structure, and improves toughness and ductility of steel; excessive sulfur causes hot shortness and requires precise control.
Combined with manganese to form MnS, it avoids hot shortness caused by low‑melting FeS eutectic and ensures stability during high‑temperature processing.
Advantages Over Other Sulfur Additives
High and stable sulfur content: High purity of lumps ensures high sulfurization efficiency and small composition fluctuation, facilitating precise control of sulfur content.
Moderate melting point and stable release: Gradually decomposes and releases sulfur at high temperatures without splashing or dusting, with high absorption rate (≥90%).
Low cost and low impurities: Lower cost than ferrous sulfide (FeS) and sulfur powder; low harmful impurities (P, As, Pb), avoiding contamination of molten steel.
As our company's flagship product, the high-grade pyrite is used as a sulfurizing agent in steelmaking and casting, featuring high sulfur content, low impurities and low moisture content.
