Nickel Alloy M30C
UNS J24130 · ASTM A494 M30C
M30C is a cast nickel-copper alloy of the Monel family (UNS J24130, ASTM A494 M30C), with a niobium addition and composition modified for castability rather than wrought processing.
Reference datasheet — M30C is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the F condition
M30C tempers and conditions
M30C is supplied in 4 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Homogenized / solution annealed | Use when maximum ductility, dimensional stability and uniform corrosion behaviour are needed after heavy segregation in thick castings. | 240 | 470 | 36 | 125 HB | 3.3 % IACS |
Stress relieved | Pick after major weld repair or heavy machining of thick sections to lower residual stress and reduce SCC risk in service. | 255 | 490 | 32 | 135 HB | 3.3 % IACS |
As-welded deposit | Condition of upgraded/repaired castings; Nb content gives crack-free deposits but weld metal ductility is below the parent as-cast body. | 265 | 470 | 22 | 150 HB | 3.1 % IACS |
FDefault As fabricated | Standard supply condition for ASTM A494 M30C pump and valve castings; meets 448/225/25 minimums without heat treatment. | 270 | 500 | 30 | 140 HB | 3.2 % IACS |
What is M30C?
M30C is a cast nickel-copper alloy of the Monel family (UNS J24130, ASTM A494 M30C), with a niobium addition and composition modified for castability rather than wrought processing. It is used for sand and investment cast seawater pump impellers, valve bodies and marine hardware, delivering 270 MPa yield, 500 MPa tensile, 30 % elongation and about 140 HB in the as-cast condition. Service is limited to 480 °C, the alloy has no chromium so it is not suited to oxidizing acids, and it machines like Monel 400. Where higher strength is required, M30H is the nearest alternative; M35-2 covers general Monel 400-type castings. M30C has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 81% of nickel alloy grades. It melts at 1,290°C (2,354 °F). M30C has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 150 GPa (21.8 Msi).
What is M30C used for?
- seawater pump impellers
- valve bodies
- marine hardware castings
Advantages
- Easy to machine — 35/100, better than 97% of nickel alloy grades
- Conducts heat well — 22 W/m·K (12.7 BTU/hr·ft·°F), better than 91% of nickel alloy grades
- High electrical conductivity — 3.2 % IACS, better than 89% of nickel alloy grades
Limitations
- Low stiffness — 150 GPa (21.8 Msi), worse than 95% of nickel alloy grades
- Low strength — 270 MPa (39.2 ksi), worse than 84% of nickel alloy grades
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
- Limited formability — 15/100, worse than 81% of nickel alloy grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 77% of nickel alloy grades
M30C properties
Typical room-temperature values for M30C-F; bars are the position among nickel alloy grades.
Physical3
M30C has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 81% of nickel alloy grades. It melts at 1,290°C (2,354 °F).
Mechanical16
M30C has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal6
M30C is rated for continuous service to 480°C (896 °F). It conducts heat at 22 W/m·K (12.7 BTU/hr·ft·°F), better than 91% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
M30C conducts electricity at 3.2 % IACS, better than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 51% of nickel alloy grades.
Sustainability4
Producing a kilogram of M30C takes about 150 MJ of energy and emits 11.5 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
M30C's machinability is fair (35/100, better than 97% of nickel alloy grades); weldability good (68/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. M30C is highlighted; hover a dot for its name, or open the interactive family chart.
Working with M30C
Is M30C easy to machine?
Machine like Monel 400: rigid setup, positive-rake carbide, low speed (20–35 m/min) with heavy constant feed and flood coolant to avoid work-hardened glazing.
Can M30C be welded?
Readily GTAW/SMAW repaired with ERNiCu-7/ENiCu-7 filler; keep interpass below ~150 °C, clean thoroughly, and avoid sulfur contamination to prevent hot cracking.
Can M30C be formed, bent or molded?
Sand or investment cast only; needs generous risering and chills because of long freezing range — Nb reduces hot tearing versus M35-1.
M30C 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 |
|---|---|---|
| Cmax per ASTM A494 | ≤ 0.3 | 0.2 |
| Mn | ≤ 1.5 | 1 |
| Si | 1 – 2 | 1.5 |
| NiNi may include Co | 64 – 68 | 66 |
| NbNb+Ta; improves weldability and hot-tear resistance | 1 – 3 | 2 |
| Fe | ≤ 3.5 | 2 |
| S | ≤ 0.03 | |
| P | ≤ 0.03 | |
| Cubalance, typically 26–33 % | balance |
What surface finishes work on M30C?
Not anodizable; pickle/passivate after welding, then mechanically polish or apply electroless nickel where extra erosion resistance is needed.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy M30C in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J24130
- ASTM
- A494 M30C
- Similar grades
- N05500
How much does M30C cost?
M30C is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
M30C — frequently asked
What is M30C used for?
M30C is typically used for seawater pump impellers, valve bodies and marine hardware castings. In short: nb-modified for better castability; seawater-grade Ni-Cu casting; lower hot-tearing than M35-1.
What is the yield strength of M30C?
M30C has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is M30C easy to machine?
Not especially — machinability is rated fair (35/100, better than 97% of nickel alloy grades). Machine like Monel 400: rigid setup, positive-rake carbide, low speed (20–35 m/min) with heavy constant feed and flood coolant to avoid work-hardened glazing.
Can M30C be welded?
Yes — weldability is rated good (68/100). Readily GTAW/SMAW repaired with ERNiCu-7/ENiCu-7 filler; keep interpass below ~150 °C, clean thoroughly, and avoid sulfur contamination to prevent hot cracking.
What surface finishes work on M30C?
Not anodizable; pickle/passivate after welding, then mechanically polish or apply electroless nickel where extra erosion resistance is needed.
Can M30C be formed, bent or molded?
Sand or investment cast only; needs generous risering and chills because of long freezing range — Nb reduces hot tearing versus M35-1.
What is the maximum service temperature of M30C?
M30C is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between M30C-F and M30C-HOM?
F is the default condition — standard supply condition for ASTM A494 M30C pump and valve castings; meets 448/225/25 minimums without heat treatment. HOM: use when maximum ductility, dimensional stability and uniform corrosion behaviour are needed after heavy segregation in thick castings. Yield strength is 270 MPa in F versus 240 MPa in HOM.
How much does M30C cost?
M30C is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A494/A494M — Castings, Nickel and Nickel Alloy — ASTM International (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
- Monel alloy 400 / K-500 technical bulletins (property analogues) — Special Metals Corporation (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.