Magnesium Ingot High Quality

#Magnesiumingot:Mg>99.95%impuritycontent:iron<0.002,silicon<0.009,aluminium<0.006,manganese<0.015,nickel<0.001,copper<0.005,totalimpurity<0.05%.

2Magnesiumingot:Mg99.9    impurity content  Fe0.04 Si0.005 Al0.02 Mn0.03 Ni0.001 Cu0.004 impurity total 0.1%.

Magnesiumapplications:Mainlyconcentratedinmagnesiumalloyproduction,aluminumalloyproduction,steel-makingdesulfurization,aviationandmilitaryindustries,inadditiontorareearthalloys,metalreduction,chemicalindustryandinstrumentmanufacturingindustry.

 

Brand name	Chemical constituents (mass fraction)/%
	Mg≥	Impurity element≤
		Fe	Si	Ni	Cu	Al	Mn	Ti	Pb	Sn	Zn	其他
Mg9999	99.99	0.002	0.002	0.0003	0.002	0.002	0.002	0.0005	0.001	0.002	0.003	-
Mg9998	99.98	0.002	0.003	0.0005	0.004	0.004	0.002	0.001	0.001	0.004	0.004	-
Mg9995A	99.95	0.003	0.006	0.001	0.002	0.008	0.006	-	0.005	0.005	0.005	0.005
Mg9990B	99.90	0.04	0.03	0.001	0.004	0.02	0.03	-	-	-	-	0.01
Mg9980	99.80	0.05	0.05	0.002	0.002	0.005	0.005	-	-	-	-	0.01
Cb,Hg,As,Cr6+Elements may not be routinely analyzed by suppliers, but their contents and requirements shall be monitored.(Cd+Hg+As+Cr)≤0.03%

 

 

 

 

Background
A leading international manufacturer of aerospace-grade aluminum extrusions (seating tracks and wing stringers) faced persistent issues with tensile strength inconsistency and hydrogen porosity. Their existing magnesium ingot, used as an alloying addition (target: 4.0–4.5% Mg in 5083 alloy), showed variable dissolution behavior and high oxide inclusion levels, resulting in a 12% rejection rate during ultrasonic testing.

 

The Challenge
The customer required a magnesium ingot that delivers:

Consistent magnesium recovery (98–99.5%)

Ultra-low impurity limits (especially Fe, Cu, Ni for corrosion resistance)

Clean, oxide-free surface to prevent dross entrainment

Uniform dissolution without sparking or rapid oxidation

 

Solution
They switched to a high-purity magnesium ingot (99.95% Mg min.) with the following specifications:

Impurity control: Fe ≤0.002%, Cu ≤0.001%, Ni ≤0.0005%, Si ≤0.003%

Physical form: 7.5 kg tapered ingots, chamfered edges, bright metallic surface

Packaging: Vacuum-sealed aluminum foil + desiccant to prevent pre-oxidation

 

Implementation
The new ingots were introduced into the existing reverberatory furnace process:

Addition temperature: 720–740°C (under argon cover gas)

Addition method: Preheated ingots (150°C) submerged via bell tool

Holding time after addition: ≤20 minutes before casting

 

Comparative Results (30 production runs)

Parameter	Standard Mg Ingot	High-Quality Mg Ingot	Improvement
Mg recovery	94.2%	99.1%	+5.2%
Iron content in alloy	0.018%	0.007%	-61%
Hydrogen porosity (X-ray)	Class B (3–5%)	Class A (<1%)	-75%
Tensile strength (MPa)	285 ± 18	305 ± 6	+7% (lower scatter)
Corrosion rate (ASTM G67)	18 mg/cm²/day	8 mg/cm²/day	-56%
Rejection rate	12.3%	1.8%	-85%

 

Key Observations

Faster dissolution: High-quality ingots melted completely within 45 seconds vs. 90 seconds for standard grade, reducing furnace exposure time.

Reduced dross formation: Oxide-free surface cut dross generation by 60%, saving €120 per melt.

Consistent grain refinement: Uniform Mg distribution eliminated banding in final extrusions.

Extended furnace life: Lower chloride flux usage (due to cleaner ingots) doubled refractory lining life from 18 to 36 months.

Financial Impact
The aerospace customer calculated annual savings of €340,000:

€150,000 from reduced scrap and rework

€90,000 from lower dross handling and flux consumption

€100,000 from extended furnace maintenance intervals

 

Conclusion
By upgrading to high-quality magnesium ingot with rigorous purity control (99.95% Mg, Fe<20 ppm) and oxide-free surfaces, the manufacturer achieved:

Zero field failures in subsequent fatigue testing (10⁷ cycles)

AS9100D certification renewal with improved process capability (Cpk from 0.9 to 1.4)

Ability to competitively bid on new aerospace contracts requiring EN 573-3 compliance

 

Recommendation
For aluminum alloy producers targeting demanding sectors (aerospace, automotive, defense), high-quality magnesium ingot is not an added cost-it is an investment. The payback period for this switch was under 60 days, driven by recovery efficiency alone. Always demand certified mill test reports (MTRs) with actual trace element analysis, not typical ranges.

 

📧E-mail: goldenltd.silicon@gmail.com    📞WhatsApp: 86 16663721147  

 

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