Nickel Alloy Alloy 45TM HR-A
Finish state
UNS N06045 · also Nicrofer 45TM
HR-A = hot Rolled / Hot Finished + Annealed + Pickled
Heavy plate and forged/hot-rolled bar for furnace retorts and vessel shells; slightly coarser grain and marginally lower strength than cold-rolled sheet.
Values for the HR-A condition
Other Alloy 45TM tempers and conditions
Alloy 45TM is listed in 5 conditions; see the grade overview at Alloy 45TM.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HR-AThis page Hot Rolled / Hot Finished + Annealed + Pickled | Heavy plate and forged/hot-rolled bar for furnace retorts and vessel shells; slightly coarser grain and marginally lower strength than cold-rolled sheet. | 315 | 710 | 45 | 172 HB | 1.4 % IACS |
SADefault Solution Annealed | Standard supply condition for plate, sheet, tube and bar — maximum ductility and best carburization/metal-dusting resistance. | 330 | 730 | 42 | 180 HB | 1.4 % IACS |
Cold Rolled + Annealed | Thin sheet/strip with bright annealed or 2D finish for fabricated liners, bellows and formed furnace components. | 345 | 750 | 40 | 185 HB | 1.4 % IACS |
As-welded deposit | Typical all-weld-metal properties for GTAW/GMAW joints made with matching 45TM filler; used for design of welded furnace assemblies. | 400 | 700 | 30 | 195 HB | 1.4 % IACS |
Cold drawn | Higher strength and better surface/tolerances for small-diameter tube and bar where residual cold work is acceptable below ~500 °C service. | 600 | 860 | 22 | 23 HRC | 1.4 % IACS |
What is Alloy 45TM HR-A?
Alloy 45TM HR-A is Alloy 45TM supplied in the HR-A condition — heavy plate and forged/hot-rolled bar for furnace retorts and vessel shells; slightly coarser grain and marginally lower strength than cold-rolled sheet. Alloy 45TM HR-A has a yield strength of 315 MPa (45.7 ksi) and a tensile strength of 710 MPa (103 ksi) — weaker than 70% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). Alloy 45TM HR-A has a density of 7.6 g/cm³ (0.275 lb/in³), lighter than 99% of nickel alloy grades. It melts at 1,360°C (2,480 °F). SA is the default condition FabDigit quotes; HR-A is available on request or by drawing note.
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 88% of nickel alloy grades
Alloy 45TM HR-A properties
Typical room-temperature values for Alloy 45TM HR-A; 21 are specific to this condition. Other listed values are Alloy 45TM reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Alloy 45TM HR-A has a density of 7.6 g/cm³ (0.275 lb/in³), lighter than 99% of nickel alloy grades. It melts at 1,360°C (2,480 °F).
Mechanical15
Alloy 45TM HR-A has a yield strength of 315 MPa (45.7 ksi) and a tensile strength of 710 MPa (103 ksi) — weaker than 70% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal5
Alloy 45TM HR-A is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), better than 57% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
Alloy 45TM HR-A conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 45TM HR-A 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%.
Manufacturability6
Alloy 45TM HR-A's machinability is poor (26/100, better than 80% of nickel alloy grades); weldability good (60/100); formability good (56/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 45TM HR-A
Is Alloy 45TM easy to machine?
Machine like Alloy 600/601 — rigid setups, sharp positive-rake carbide, low speed/heavy feed and flood coolant; the alloy work-hardens quickly and the ~3 % Si makes it abrasive.
Can Alloy 45TM be welded?
GTAW/GMAW/SMAW with matching 45TM (SG-NiCr 27) filler, low heat input, interpass ≤150 °C and no preheat; the high Si content makes it sensitive to hot cracking with excessive restraint or dilution.
Can Alloy 45TM be formed, bent or molded?
Cold form with roughly 1.5–2× the force of austenitic stainless, generous radii and intermediate anneals; hot work at 1150–900 °C followed by rapid cooling from ~1150 °C.
What surface finishes work on Alloy 45TM?
Pickle or grind off the tenacious Cr/Si oxide scale before service; no anodizing — mechanical polishing or bright annealing gives the best oxidation-resistant surface.
Alloy 45TM 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 |
|---|---|---|
| Niprincipal element | 44 – 48 | 45 |
| Cr | 26 – 29 | 27 |
| Sikey for metal-dusting/carburization resistance | 2.5 – 3 | 2.75 |
| C | 0.05 – 0.12 | 0.08 |
| Mn | ≤ 1 | 0.3 |
| Cerare earth, oxide-scale adherence | 0.03 – 0.09 | 0.06 |
| Al | ≤ 0.3 | 0.1 |
| Ti | ≤ 0.3 | — |
| Cu | ≤ 0.3 | — |
| P | ≤ 0.02 | — |
| S | ≤ 0.01 | — |
| Febalance, approx. 21–25 % | balance | — |
Alloy 45TM HR-A — frequently asked
What is Alloy 45TM HR-A used for?
Alloy 45TM HR-A is typically used for ethylene cracker tubes/fittings, steam-methane reformer components, carburizing furnace parts and petrochemical process tubing. In short: metal-dusting resistant grade; ~45% Cr heat-resisting alloy; carburization-resistant reformer alloy.
What is the yield strength of Alloy 45TM HR-A?
Alloy 45TM HR-A has a typical yield strength of 315 MPa (45.7 ksi) and a tensile strength of 710 MPa (103 ksi) — weaker than 70% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Alloy 45TM HR-A easy to machine?
Not especially — machinability is rated poor (26/100, better than 80% of nickel alloy grades). Machine like Alloy 600/601 — rigid setups, sharp positive-rake carbide, low speed/heavy feed and flood coolant; the alloy work-hardens quickly and the ~3 % Si makes it abrasive.
Can Alloy 45TM HR-A be welded?
Yes — weldability is rated good (60/100). GTAW/GMAW/SMAW with matching 45TM (SG-NiCr 27) filler, low heat input, interpass ≤150 °C and no preheat; the high Si content makes it sensitive to hot cracking with excessive restraint or dilution.
What surface finishes work on Alloy 45TM HR-A?
Pickle or grind off the tenacious Cr/Si oxide scale before service; no anodizing — mechanical polishing or bright annealing gives the best oxidation-resistant surface.
Can Alloy 45TM HR-A be formed, bent or molded?
Cold form with roughly 1.5–2× the force of austenitic stainless, generous radii and intermediate anneals; hot work at 1150–900 °C followed by rapid cooling from ~1150 °C.
What is the maximum service temperature of Alloy 45TM HR-A?
Alloy 45TM HR-A is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 45TM-SA and Alloy 45TM-CD?
SA is the default condition — standard supply condition for plate, sheet, tube and bar — maximum ductility and best carburization/metal-dusting resistance. CD: higher strength and better surface/tolerances for small-diameter tube and bar where residual cold work is acceptable below ~500 °C service. Yield strength is 330 MPa in SA versus 600 MPa in CD.
Sources
- VDM Metals Material Data Sheet No. 4051 — Nicrofer 45 TM / Alloy 45 TM — VDM Metals (2018)
- ASTM B409 / B408 / B622 (UNS N06045 plate, sheet, strip, bar, tube) — ASTM International (2020)
- EN 10095 / VdTÜV WB 508 — heat resisting steels and nickel alloys, material 2.4889 — CEN / VdTÜV (2018)
- ASM Handbook Vol. 13B — Corrosion: Materials (high-temperature carburization and metal dusting) — 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.