Nickel Alloy M30C-HOM
Heat-treated state
UNS J24130 · ASTM A494 M30C
HOM = homogenized / solution annealed
Use when maximum ductility, dimensional stability and uniform corrosion behaviour are needed after heavy segregation in thick castings.
Values for the HOM condition
Other M30C tempers and conditions
M30C is listed in 4 conditions; see the grade overview at M30C.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HOMThis page 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-HOM?
M30C-HOM is M30C heat treated to HOM — use when maximum ductility, dimensional stability and uniform corrosion behaviour are needed after heavy segregation in thick castings. M30C-HOM has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 90% of nickel alloy grades. Elongation at break is 36% and the elastic modulus is 150 GPa (21.8 Msi). M30C-HOM 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). F is the default condition FabDigit quotes; HOM is available on request or by drawing note.
Advantages
- Easy to machine — 38/100, better than 98% 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 — 3.3 % IACS, better than 90% of nickel alloy grades
Limitations
- Low stiffness — 150 GPa (21.8 Msi), worse than 95% of nickel alloy grades
- Low strength — 240 MPa (34.8 ksi), worse than 90% of nickel alloy grades
- Limited service temperature — 480°C (896 °F), worse than 82% of nickel alloy grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 77% of nickel alloy grades
M30C-HOM properties
Typical room-temperature values for M30C-HOM; 20 are specific to this condition. Other listed values are M30C reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
M30C-HOM 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-HOM has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 90% of nickel alloy grades. Elongation at break is 36% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal6
M30C-HOM 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-HOM conducts electricity at 3.3 % IACS, better than 90% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 61% of nickel alloy grades.
Sustainability4
Producing a kilogram of M30C-HOM 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-HOM's machinability is fair (38/100, better than 98% of nickel alloy grades); weldability very good (72/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with M30C-HOM
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.
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.
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 | — |
M30C-HOM — frequently asked
What is M30C-HOM used for?
M30C-HOM 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-HOM?
M30C-HOM has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 90% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is M30C-HOM easy to machine?
Not especially — machinability is rated fair (38/100, better than 98% 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-HOM be welded?
Yes — weldability is rated very good (72/100). 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-HOM?
Not anodizable; pickle/passivate after welding, then mechanically polish or apply electroless nickel where extra erosion resistance is needed.
Can M30C-HOM 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-HOM?
M30C-HOM 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.