Stainless Steel N08031 HR-SA
Other
UNS N08031 · EN 1.4562, X1NiCrMoCu32-28-7
Heavy plate for vessels, tube sheets and FGD equipment; lowest strength, highest ductility of the annealed forms.
Values for the HR-SA condition
Other N08031 tempers and conditions
N08031 is listed in 7 conditions; see the grade overview at N08031.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HR-SAThis page hot rolled, solution annealed and pickled plate | Heavy plate for vessels, tube sheets and FGD equipment; lowest strength, highest ductility of the annealed forms. | 340 | 690 | 55 | 175 HB | 1.7 % IACS |
Forged + SA | Forgings and heavy fittings per ASTM B564-type practice, solution annealed after hot working to dissolve intermetallics. | 340 | 690 | 50 | 180 HB | 1.7 % IACS |
SADefault Solution annealed | Standard supply condition for all product forms; maximum corrosion resistance and ductility. | 360 | 700 | 50 | 180 HB | — |
cold rolled, bright/2B annealed sheet & strip | Thin sheet and strip for linings, plate heat exchangers and formed parts requiring a smooth surface. | 380 | 720 | 48 | 185 HB | 1.7 % IACS |
As-welded deposit | Property set for as-welded fabrication using over-alloyed filler (e.g. ERNiCrMo-3/-4 or matching 31 filler); no post-weld heat treatment normally applied. | 380 | 680 | 35 | 195 HB | 1.6 % IACS |
Cold drawn | Cold drawn bar for fasteners, shafts and machined valve parts where higher yield strength and close tolerance are needed. | 550 | 800 | 30 | 20 HRC | 1.7 % IACS |
Cold worked | Cold-pilgered or cold-drawn tubing supplied without final anneal where higher pressure rating is required; corrosion performance is best restored by a final solution anneal. | 620 | 850 | 25 | 24 HRC | 1.7 % IACS |
What is N08031 HR-SA?
N08031 HR-SA is N08031 in the HR-SA condition — heavy plate for vessels, tube sheets and FGD equipment; lowest strength, highest ductility of the annealed forms. N08031 HR-SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 55% and the elastic modulus is 195 GPa (28.3 Msi). N08031 HR-SA has a density of 8.02 g/cm³ (0.29 lb/in³), heavier than 97% of stainless steel grades. It melts at 1,320°C (2,408 °F). SA is the default condition FabDigit quotes; HR-SA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 92/100, better than 99% of stainless steel grades
- Ductile — tolerates forming and impact — 55%, better than 97% of stainless steel grades
Limitations
- Poor heat conductor — 11 W/m·K (6.36 BTU/hr·ft·°F), worse than 99% of stainless steel grades
- High embodied carbon — 8 kg CO₂/kg, worse than 99% of stainless steel grades
- Difficult to machine — 20/100, worse than 98% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
N08031 HR-SA properties
Typical room-temperature values for N08031 HR-SA; 22 are specific to this condition. Other listed values are N08031 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08031 HR-SA has a density of 8.02 g/cm³ (0.29 lb/in³), heavier than 97% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical14
N08031 HR-SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Elongation at break is 55% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
N08031 HR-SA is rated for continuous service to 450°C (842 °F). It conducts heat at 11 W/m·K (6.36 BTU/hr·ft·°F), worse than 99% of stainless steel grades. Thermal expansion is 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
N08031 HR-SA conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 99% of stainless steel grades.
Sustainability4
Producing a kilogram of N08031 HR-SA takes about 100 MJ of energy and emits 8 kg of CO₂ — more than 98% of stainless steel grades. Typical recycled content is 35%.
Manufacturability7
N08031 HR-SA's machinability is poor (20/100, worse than 98% of stainless steel grades); weldability very good (70/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08031 HR-SA
Is N08031 easy to machine?
Machine like a nickel alloy: rigid setup, positive-rake carbide, heavy constant feed to cut under the work-hardened layer, low speed (~15–25 m/min) with flood coolant.
Can N08031 be welded?
GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4 or matching alloy 31 filler), low heat input, interpass < 150 °C, no preheat or PWHT; avoid autogenous welding.
Can N08031 be formed, bent or molded?
Excellent cold ductility but ~2× the forming load of 304; hot working 1150–1000 °C followed by mandatory solution anneal and quench.
What surface finishes work on N08031?
Pickle (HNO3-HF) or bead-blast plus passivation after fabrication to remove heat tint; electropolishing gives best performance in acid service; never anodized or plated.
N08031 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 |
|---|---|---|
| Clow carbon for intergranular corrosion resistance | ≤ 0.02 | 0.01 |
| Si | ≤ 0.3 | 0.15 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.02 | 0.02 |
| S | ≤ 0.01 | 0 |
| Cr | 26 – 28 | 27 |
| Ni | 30 – 32 | 31 |
| Mo | 6 – 7 | 6.5 |
| Cukey for hot sulfuric/phosphoric acid resistance | 1 – 1.4 | 1.2 |
| Nraises PREN and strength | 0.15 – 0.25 | 0.2 |
| Febalance, approx. 31–33% | balance | — |
N08031 HR-SA — frequently asked
What is N08031 HR-SA used for?
N08031 HR-SA is typically used for sulfuric acid production, flue gas desulfurization systems, phosphoric acid plants, pulp and paper bleaching equipment and chemical process piping. In short: copper-bearing acid superaustenitic; beyond 6% Mo grades; top corrosion score, poor machinability.
What is the yield strength of N08031 HR-SA?
N08031 HR-SA has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 55% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is N08031 HR-SA easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of stainless steel grades). Machine like a nickel alloy: rigid setup, positive-rake carbide, heavy constant feed to cut under the work-hardened layer, low speed (~15–25 m/min) with flood coolant.
Can N08031 HR-SA be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4 or matching alloy 31 filler), low heat input, interpass < 150 °C, no preheat or PWHT; avoid autogenous welding.
What surface finishes work on N08031 HR-SA?
Pickle (HNO3-HF) or bead-blast plus passivation after fabrication to remove heat tint; electropolishing gives best performance in acid service; never anodized or plated.
Can N08031 HR-SA be formed, bent or molded?
Excellent cold ductility but ~2× the forming load of 304; hot working 1150–1000 °C followed by mandatory solution anneal and quench.
What is the maximum service temperature of N08031 HR-SA?
N08031 HR-SA is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N08031-SA and N08031-CW?
SA is the default condition — standard supply condition for all product forms; maximum corrosion resistance and ductility. CW: cold-pilgered or cold-drawn tubing supplied without final anneal where higher pressure rating is required; corrosion performance is best restored by a final solution anneal. Yield strength is 360 MPa in SA versus 620 MPa in CW.
Sources
- ASTM B625 — Ni-Fe-Cr-Mo-Cu Alloy Plate, Sheet and Strip (UNS N08031) — ASTM International (2021)
- ASTM B622 / B649 — Seamless Pipe & Tube, Bar and Wire for UNS N08031 — ASTM International (2020)
- EN 10088-2 / 10028-7 — Stainless steel 1.4562 (X1NiCrMoCu32-28-7) — CEN (2014)
- Nicrofer 3127 hMo — Alloy 31 material data sheet — VDM Metals (2020)
- ASM Handbook Vol. 13B — Corrosion: Materials (superaustenitic stainless steels) — 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.