Stainless Steel RA85H HF-ANN
Finish state
UNS S30615
HF-ANN = hot Finished / Hot Rolled Annealed bar
Large-diameter bar and forging stock for grate bars, rolls and heavy fixtures.
Values for the HF-ANN condition
Other RA85H tempers and conditions
RA85H is listed in 3 conditions; see the grade overview at RA85H.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HF-ANNThis page Hot Finished / Hot Rolled Annealed bar | Large-diameter bar and forging stock for grate bars, rolls and heavy fixtures. | 340 | 650 | 44 | 185 HB | 1.7 % IACS |
ANNDefault Annealed | Standard stocked condition for plate, sheet, bar and pipe; maximum ductility and best carburization/oxidation resistance. | 345 | 655 | 45 | 180 HB | 1.7 % IACS |
Cold drawn | Choose for straight, close-tolerance bar stock (fixture pins, studs) where higher room-temperature strength is useful. | 550 | 760 | 25 | 20 HRC | 1.7 % IACS |
What is RA85H HF-ANN?
RA85H HF-ANN is RA85H supplied in the HF-ANN condition — large-diameter bar and forging stock for grate bars, rolls and heavy fixtures. RA85H HF-ANN has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 650 MPa (94.3 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 44% and the elastic modulus is 196 GPa (28.4 Msi). RA85H HF-ANN has a density of 7.72 g/cm³ (0.279 lb/in³), lighter than 72% of stainless steel grades. It melts at 1,350°C (2,462 °F). ANN is the default condition FabDigit quotes; HF-ANN is available on request or by drawing note.
Advantages
- High service temperature — 1,095°C (2,003 °F), better than 94% of stainless steel grades
Limitations
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Poor heat conductor — 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
RA85H HF-ANN properties
Typical room-temperature values for RA85H HF-ANN; 22 are specific to this condition. Other listed values are RA85H reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
RA85H HF-ANN has a density of 7.72 g/cm³ (0.279 lb/in³), lighter than 72% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical16
RA85H HF-ANN has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 650 MPa (94.3 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 44% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal4
RA85H HF-ANN is rated for continuous service to 1,095°C (2,003 °F). It conducts heat at 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades. Thermal expansion is 15.6 µm/m·K (8.67 µin/in·°F).
Electrical3
RA85H HF-ANN conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of RA85H HF-ANN takes about 58 MJ of energy and emits 5.2 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
RA85H HF-ANN's machinability is poor (27/100, worse than 83% of stainless steel grades); weldability good (55/100); formability fair (52/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with RA85H HF-ANN
Is RA85H easy to machine?
Machines like a tough, work-hardening 310 but harder on tools due to silicon — rigid setup, sharp positive-rake carbide, heavy positive feed, low-to-moderate SFM and flood coolant; never dwell or rub.
Can RA85H be welded?
GTAW/GMAW/SMAW with high-nickel filler (RA330-04, ERNiCr-3 or similar) — no matching filler; keep heat input and interpass temperature low, no preheat needed, post-weld anneal for maximum service ductility.
Can RA85H be formed, bent or molded?
Cold forms and rolls readily in annealed sheet but work hardens fast — allow extra power and interstage annealing at ~1120–1175 °C; hot work 1150–1200 °C and never finish below ~950 °C.
What surface finishes work on RA85H?
Pickle/passivate after hot work or welding to restore the Cr/Si oxide; a pre-oxidation soak in air at 1000–1100 °C builds the protective scale before service. Not anodizable; paint only for cold sections.
RA85H 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 |
|---|---|---|
| Ccarbon kept high for creep strength | 0.16 – 0.24 | 0.2 |
| Sikey addition for carburization/oxidation resistance | 3.2 – 4 | 3.6 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.03 | — |
| S | ≤ 0.03 | — |
| Cr | 17 – 19.5 | 18.5 |
| Ni | 13.5 – 16 | 14.5 |
| Alco-forms protective Al/Si oxide | 0.8 – 1.5 | 1 |
| Fe | balance | — |
RA85H HF-ANN — frequently asked
What is RA85H HF-ANN used for?
RA85H HF-ANN is typically used for heat-treat baskets and fixtures, radiant tubes and kiln rollers. In short: carburization-resistant 310 variant; service to 1095 °C; needs nickel-base filler.
What is the yield strength of RA85H HF-ANN?
RA85H HF-ANN has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 650 MPa (94.3 ksi) — weaker than 55% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is RA85H HF-ANN easy to machine?
Not especially — machinability is rated poor (27/100, worse than 83% of stainless steel grades). Machines like a tough, work-hardening 310 but harder on tools due to silicon — rigid setup, sharp positive-rake carbide, heavy positive feed, low-to-moderate SFM and flood coolant; never dwell or rub.
Can RA85H HF-ANN be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW/SMAW with high-nickel filler (RA330-04, ERNiCr-3 or similar) — no matching filler; keep heat input and interpass temperature low, no preheat needed, post-weld anneal for maximum service ductility.
What surface finishes work on RA85H HF-ANN?
Pickle/passivate after hot work or welding to restore the Cr/Si oxide; a pre-oxidation soak in air at 1000–1100 °C builds the protective scale before service. Not anodizable; paint only for cold sections.
Can RA85H HF-ANN be formed, bent or molded?
Cold forms and rolls readily in annealed sheet but work hardens fast — allow extra power and interstage annealing at ~1120–1175 °C; hot work 1150–1200 °C and never finish below ~950 °C.
What is the maximum service temperature of RA85H HF-ANN?
RA85H HF-ANN is rated for continuous use to about 1,095°C (2,003 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between RA85H-ANN and RA85H-CD?
ANN is the default condition — standard stocked condition for plate, sheet, bar and pipe; maximum ductility and best carburization/oxidation resistance. CD: choose for straight, close-tolerance bar stock (fixture pins, studs) where higher room-temperature strength is useful. Yield strength is 345 MPa in ANN versus 550 MPa in CD.
Sources
- RA 85H Heat Resistant Alloy Data Sheet — Rolled Alloys (2022)
- ASTM A167 / A240 / A479 supplementary listings for UNS S30615 — ASTM International (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- SAE/ASTM Metals & Alloys in the Unified Numbering System (UNS S30615) — SAE International (2017)
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.