Product Description
High-magnesium cored wire is a metallurgical-grade composite cored wire with a high magnesium content. Its primary function is for spheroidization treatment in ductile iron production; it can also be used for desulfurization, deoxidation, and microalloying in steelmaking.
Basic Structure and Specifications
| Structure | Outer layer of low-carbon steel strip (0.3–0.5 mm thick), filled with high-magnesium alloy powder |
| Wire Diameter | Typically 12–13 mm; lengths can be customized as required |
Typical Composition of Core Material (wt%)
| Mg | 25–40% (primary spheroidizing element) |
| Si | 30–45% (deoxidation, inoculation, spheroidization stabilization) |
| Ca, Ba, Rare Earths (RE) | 1–8% (desulfurization, deoxidation, graphite refinement) |
| Balance | Fe, trace amounts of Al, impurities |
Production Process
1. Alloy Melting: Mg, Si, Ca, Ba, rare earth elements, and other components are melted in specific proportions to form a high-magnesium spheroidizing alloy.
2. Crushing and Powdering: The alloy is crushed into 0.1–3 mm granules or powder.
3. Core Wire Forming: Steel strip is rolled into a tube, filled with core material, sealed, and continuously rolled into a continuous strand.
Core Applications
Ductile Iron Production
This is the most common application. It transforms graphite from flake-like to spherical, significantly enhancing the strength, toughness, and ductility of cast iron.
Steel Refining
High-magnesium core wires can be used for deep desulfurization and deoxidation of molten steel, as well as for microalloying, grain refinement, and improving inclusion morphology.
Molten Iron Pretreatment
It enables one-step desulfurization, spheroidization, and inoculation, simplifying the process and reducing costs.
Key Advantages
High Magnesium Absorption Rate
The wire is fed directly into the depths of the molten iron for reaction, resulting in a significantly higher magnesium utilization rate than traditional injection methods, requiring less material and lowering costs.
Stable Spheroidization
The high-magnesium core wire has a uniform composition and controllable feeding speed, producing well-rounded, fine, and uniform graphite spheroids. This ensures more consistent strength, toughness, and machinability in castings.
Minimal Pollution
The core wire reacts gently, resulting in minimal smoke, spatter, and noise, thereby improving the workshop environment.
Simple Process
One-button operation using a feeding machine requires minimal manual labor and low physical exertion, making it easy to implement assembly line and automated production.
Precise and Adjustable Composition
Can be formulated with elements such as rare earths, calcium, and barium according to casting requirements.
How to Choose
High-Magnesium Type (Mg 30–40%)
High-end ductile iron, high requirements for low-temperature toughness
Medium-Magnesium Type (Mg 25–30%)
General-purpose ductile iron, small to medium castings, cost-effectiveness priority
Key Points for Wire Feeding
Molten iron temperature 1450–1550°C; maintain a stable feeding speed; insert the wire into the bottom of the mold; avoid oxidation
FAQ
Q: What is the primary function of high-magnesium cored wire?
A: It is primarily used for desulfurization, deoxidation, and purification of molten steel to improve steel purity.
Q: For which steel grades is high-magnesium cored wire suitable?
A: It is suitable for low-sulfur steel, pipeline steel, pressure vessel steel, high-quality structural steel, and others.
Q: What is the difference between high-magnesium cored wire and pure calcium cored wire?
A: High-magnesium cored wire offers strong desulfurization capabilities, while pure calcium cored wire helps reduce inclusions and prevent clogging.
Q: What precautions should be taken when using high-magnesium cored wire?
A: Control the feeding speed and depth; store in a moisture-proof, sealed container; and use the product as soon as possible after opening the packaging.
Q: What factors indicate the quality of high-magnesium cored wire?
A: Check for stable magnesium content, good sealing of the steel strip, uniform wire diameter, and smooth feeding.
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