Stainless Steel HG10MNN-AC (Spheroidize annealed)
Heat-treated state
UNS J92604
Choose for purely heat-resistant furnace hardware per A297 practice, where dendritic as-cast structure and slightly higher yield are acceptable.
Values for the AC condition
Other HG10MNN tempers and conditions
HG10MNN is listed in 3 conditions; see the grade overview at HG10MNN.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HTDefault Solution annealed | Standard supply condition for pressure/corrosion-service castings: maximum ductility, toughness and homogeneity of the Mn-N austenite. | 290 | 585 | 35 | 175 HB | — |
Stress relieved | Used for large or heavily welded/machined castings where distortion and residual stress must be minimised without losing austenite homogeneity. | 300 | 575 | 30 | 180 HB | 1.9 % IACS |
ACThis page Spheroidize annealed | Choose for purely heat-resistant furnace hardware per A297 practice, where dendritic as-cast structure and slightly higher yield are acceptable. | 320 | 560 | 22 | 190 HB | — |
What is HG10MNN-AC?
HG10MNN-AC is HG10MNN heat treated to AC — choose for purely heat-resistant furnace hardware per A297 practice, where dendritic as-cast structure and slightly higher yield are acceptable. HG10MNN-AC has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 190 GPa (27.6 Msi). HG10MNN-AC has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,370°C (2,498 °F). HT is the default condition FabDigit quotes; AC is available on request or by drawing note.
Advantages
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% of stainless steel grades
- High service temperature — 900°C (1,652 °F), better than 85% of stainless steel grades
Limitations
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Needs corrosion protection — 50/100, worse than 78% of stainless steel grades
- Difficult to weld — 50/100, worse than 77% of stainless steel grades
HG10MNN-AC properties
Typical room-temperature values for HG10MNN-AC; 13 are specific to this condition. Other listed values are HG10MNN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
HG10MNN-AC has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical14
HG10MNN-AC has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 60% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
HG10MNN-AC is rated for continuous service to 900°C (1,652 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
HG10MNN-AC conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of HG10MNN-AC takes about 48 MJ of energy and emits 3.4 kg of CO₂ — less than 85% of stainless steel grades. Typical recycled content is 75%.
Manufacturability7
HG10MNN-AC's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability fair (50/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with HG10MNN-AC
Is HG10MNN easy to machine?
Machine like a nitrogen-strengthened austenitic: rigid setups, sharp positive-rake carbide, heavy feed and low speed to cut under the work-hardened skin, flood coolant.
Can HG10MNN be welded?
Weldable with GTAW/SMAW using over-alloyed austenitic filler (e.g. 309/E309Mo type); keep interpass low, no preheat, and re-solution-treat critical castings after major repair.
Can HG10MNN be formed, bent or molded?
Cast only — high-Mn melts need nitrogen-controlled melting, generous risering and fast pouring to avoid pinholes and hot tears; no cold forming.
What surface finishes work on HG10MNN?
Grit-blast and pickle/passivate in nitric-based solution after casting; can be ground and polished, but casting porosity limits mirror finishes and no anodising applies.
HG10MNN 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 |
|---|---|---|
| C0.10 % max implied by the '10' in the ACI designation | ≤ 0.1 | 0.08 |
| Mnprincipal austenite stabiliser replacing Ni; verify against current standard revision | 8 – 11 | 9.5 |
| Siaids oxidation resistance and fluidity | 0.5 – 1.5 | 1 |
| Cr | 18 – 21 | 19.5 |
| Nireduced Ni is the point of the grade | 3.5 – 6 | 4.5 |
| Nsolid-solution strengthener and austenite stabiliser | 0.2 – 0.4 | 0.3 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
HG10MNN-AC — frequently asked
What is HG10MNN-AC used for?
HG10MNN-AC is typically used for furnace fixtures and jigs, conveyor components for heat-treat lines, furnace trays and baskets, quench and load-handling frames, burner and duct support castings and centrifugally cast furnace rolls. In short: nickel-saving heat-resistant casting; mn-N strengthened austenitic; service to 900 °C.
What is the yield strength of HG10MNN-AC?
HG10MNN-AC has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 60% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is HG10MNN-AC easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Machine like a nitrogen-strengthened austenitic: rigid setups, sharp positive-rake carbide, heavy feed and low speed to cut under the work-hardened skin, flood coolant.
Can HG10MNN-AC be welded?
With care — weldability is rated fair (50/100). Weldable with GTAW/SMAW using over-alloyed austenitic filler (e.g. 309/E309Mo type); keep interpass low, no preheat, and re-solution-treat critical castings after major repair.
What surface finishes work on HG10MNN-AC?
Grit-blast and pickle/passivate in nitric-based solution after casting; can be ground and polished, but casting porosity limits mirror finishes and no anodising applies.
Can HG10MNN-AC be formed, bent or molded?
Cast only — high-Mn melts need nitrogen-controlled melting, generous risering and fast pouring to avoid pinholes and hot tears; no cold forming.
What is the maximum service temperature of HG10MNN-AC?
HG10MNN-AC is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between HG10MNN-HT and HG10MNN-AC?
HT is the default condition — standard supply condition for pressure/corrosion-service castings: maximum ductility, toughness and homogeneity of the Mn-N austenite. AC: choose for purely heat-resistant furnace hardware per A297 practice, where dendritic as-cast structure and slightly higher yield are acceptable. Yield strength is 290 MPa in HT versus 320 MPa in AC.
Sources
- ASTM A743/A743M Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM International (2021)
- ASTM A297/A297M Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application — ASTM International (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Cast Stainless Steels) — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.