Nickel Alloy NiMg Master Alloy NiMg20
Grade
NiMg20 = ~20 % Mg nickel-magnesium master alloy
High-Mg grade minimising Ni addition per kg of Mg; more brittle and more reactive, used when residual Ni must be limited.
Values for the NiMg20 condition
Other NiMg Master Alloy tempers and conditions
NiMg Master Alloy is listed in 3 conditions; see the grade overview at NiMg Master Alloy.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
NiMg20This page ~20 % Mg nickel-magnesium master alloy | High-Mg grade minimising Ni addition per kg of Mg; more brittle and more reactive, used when residual Ni must be limited. | — | 100 | 0.2 | 285 HB | 4.9 % IACS |
NiMg15Default 15 % Mg nickel-magnesium master alloy, ingot/broken pieces | Standard nodulizer grade: highest Mg content still giving a compact, easily handled Ni–MgNi2 solid; the default stocked composition. | — | 130 | 0.3 | 265 HB | 5.7 % IACS |
~10 % Mg nickel-magnesium master alloy | Lower-Mg, higher-density hypoeutectic grade for heavy sections and where more Ni pick-up is wanted per unit Mg. | — | 160 | 0.5 | 209 HB | 7 % IACS |
What is NiMg Master Alloy NiMg20?
NiMg Master Alloy NiMg20 is NiMg Master Alloy in the NiMg20 grade — high-Mg grade minimising Ni addition per kg of Mg; more brittle and more reactive, used when residual Ni must be limited. NiMg Master Alloy NiMg20 has a tensile strength of 100 MPa (14.5 ksi), weaker than 100% of nickel alloy grades. Elongation at break is 0.2% and the elastic modulus is 120 GPa (17.4 Msi). NiMg Master Alloy NiMg20 has a density of 5.4 g/cm³ (0.195 lb/in³), lighter than 100% of nickel alloy grades. It melts at 760°C (1,400 °F). NiMg15 is the default condition FabDigit quotes; NiMg20 is available on request or by drawing note.
Advantages
- Lightweight — 5.4 g/cm³ (0.195 lb/in³), better than 100% of nickel alloy grades
- High electrical conductivity — 4.9 % IACS, better than 93% of nickel alloy grades
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 92% of nickel alloy grades
Limitations
- Limited ductility — 0.2%, worse than 100% of nickel alloy grades
- Difficult to machine — 4/100, worse than 100% of nickel alloy grades
- Difficult to weld — 0/100, worse than 100% of nickel alloy grades
- Limited formability — 0/100, worse than 100% of nickel alloy grades
- Low stiffness — 120 GPa (17.4 Msi), worse than 99% of nickel alloy grades
NiMg Master Alloy NiMg20 properties
Typical room-temperature values for NiMg Master Alloy NiMg20; 19 are specific to this condition. Other listed values are NiMg Master Alloy reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
NiMg Master Alloy NiMg20 has a density of 5.4 g/cm³ (0.195 lb/in³), lighter than 100% of nickel alloy grades. It melts at 760°C (1,400 °F).
Mechanical7
NiMg Master Alloy NiMg20 has a tensile strength of 100 MPa (14.5 ksi), weaker than 100% of nickel alloy grades. Elongation at break is 0.2% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal4
NiMg Master Alloy NiMg20 is rated for continuous service to 300°C (572 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 92% of nickel alloy grades. Thermal expansion is 14 µm/m·K (7.78 µin/in·°F).
Electrical3
NiMg Master Alloy NiMg20 conducts electricity at 4.9 % IACS, better than 93% of nickel alloy grades.
Chemical & Environmental2
Corrosion resistance is poor (25/100), worse than 99% of nickel alloy grades.
Sustainability3
Producing a kilogram of NiMg Master Alloy NiMg20 takes about 172 MJ of energy and emits 15 kg of CO₂ — more than 63% of nickel alloy grades. Typical recycled content is 10%.
Manufacturability4
NiMg Master Alloy NiMg20's machinability is not recommended (4/100, worse than 100% of nickel alloy grades); weldability not recommended (0/100); formability not recommended (0/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with NiMg Master Alloy NiMg20
Is NiMg Master Alloy easy to machine?
Not machined — the Ni–MgNi2 structure is hard and brittle and is jaw-crushed and screened to the required lump or granule size.
Can NiMg Master Alloy be welded?
Not weldable or joinable; supplied purely as a melt addition.
Can NiMg Master Alloy be formed, bent or molded?
Produced by induction melting Ni with Mg under cover and casting into ingots or waffle plates, then crushing.
What surface finishes work on NiMg Master Alloy?
No surface finishing; keep dry and sealed (moisture attacks the Mg-bearing phase) and preheat the ladle addition to avoid violent reaction.
NiMg Master Alloy chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Mggrade-defining; NiMg10 ≈ 9–11 %, NiMg20 ≈ 19–21 % | 14 – 16 | 15 |
| Siimpurity/optional deoxidiser | ≤ 1 | 0.3 |
| Feimpurity | ≤ 1.5 | 0.5 |
| Cimpurity | ≤ 0.3 | 0.1 |
| Cuimpurity | ≤ 0.5 | 0.1 |
| Simpurity, must stay low for nodulizing | ≤ 0.05 | 0.02 |
| Nibalance, typically ≥ 82 % | balance | — |
NiMg Master Alloy NiMg20 — frequently asked
What is NiMg Master Alloy NiMg20 used for?
NiMg Master Alloy NiMg20 is typically used for ductile iron nodulizing treatment, foundry ladle additions and spheroidal graphite iron production. In short: controlled-reaction Mg nodulizer; adds nickel with magnesium; melt addition, not stock.
What is the tensile strength of NiMg Master Alloy NiMg20?
NiMg Master Alloy NiMg20 has a typical tensile strength of 100 MPa (14.5 ksi) — weaker than 100% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is NiMg Master Alloy NiMg20 easy to machine?
Not especially — machinability is rated not recommended (4/100, worse than 100% of nickel alloy grades). Not machined — the Ni–MgNi2 structure is hard and brittle and is jaw-crushed and screened to the required lump or granule size.
Can NiMg Master Alloy NiMg20 be welded?
Not readily — weldability is rated not recommended (0/100). Not weldable or joinable; supplied purely as a melt addition.
What surface finishes work on NiMg Master Alloy NiMg20?
No surface finishing; keep dry and sealed (moisture attacks the Mg-bearing phase) and preheat the ladle addition to avoid violent reaction.
Can NiMg Master Alloy NiMg20 be formed, bent or molded?
Produced by induction melting Ni with Mg under cover and casting into ingots or waffle plates, then crushing.
What is the maximum service temperature of NiMg Master Alloy NiMg20?
NiMg Master Alloy NiMg20 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASM Handbook Vol. 3: Alloy Phase Diagrams (Mg–Ni system) — ASM International (1992)
- ASM Handbook Vol. 1A: Cast Iron Science and Technology — nodularizing treatments — ASM International (2017)
- Nickel-magnesium nodularizer master alloy datasheet — Foundry master-alloy producers (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.