Stainless Steel N08135 HF-SA
Heat-treated state
UNS N08135
HF-SA = hot Finished + Solution Annealed
Heavy sections and forgings — same metallurgical state as SA but slightly coarser grain and lower strength.
Values for the HF-SA condition
Other N08135 tempers and conditions
N08135 is listed in 5 conditions; see the grade overview at N08135.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HF-SAThis page Hot Finished + Solution Annealed | Heavy sections and forgings — same metallurgical state as SA but slightly coarser grain and lower strength. | 335 | 690 | 45 | 180 HB | 1.6 % IACS |
SADefault Solution Annealed | Standard supply condition for plate, tube and bar — maximum corrosion resistance and ductility. | 360 | 720 | 48 | 190 HB | — |
Cold Drawn + Solution Annealed | Precision tube and bar with tight tolerance and bright surface, fully softened for corrosion service. | 375 | 730 | 45 | 195 HB | 1.6 % IACS |
As-welded deposit | Properties of welded joints in fabricated equipment; post-weld solution annealing restores full corrosion resistance where possible. | 380 | 680 | 30 | 205 HB | 1.6 % IACS |
Cold worked | Choose when higher yield strength is required (e.g. downhole tubing, springs, fasteners); corrosion resistance slightly reduced and SCC sensitivity increases with strain. | 700 | 900 | 22 | 29 HRC | — |
What is N08135 HF-SA?
N08135 HF-SA is N08135 heat treated to HF-SA — heavy sections and forgings — same metallurgical state as SA but slightly coarser grain and lower strength. N08135 HF-SA has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 56% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi). N08135 HF-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,330°C (2,426 °F). SA is the default condition FabDigit quotes; HF-SA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Low electrical conductivity — 1.6 % IACS, worse than 99% of stainless steel grades
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- High embodied carbon — 7.5 kg CO₂/kg, worse than 97% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
N08135 HF-SA properties
Typical room-temperature values for N08135 HF-SA; 22 are specific to this condition. Other listed values are N08135 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08135 HF-SA has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Mechanical14
N08135 HF-SA has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 56% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
N08135 HF-SA is rated for continuous service to 800°C (1,472 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
N08135 HF-SA conducts electricity at 1.6 % IACS, worse than 99% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of N08135 HF-SA takes about 90 MJ of energy and emits 7.5 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 35%.
Manufacturability7
N08135 HF-SA's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability very good (70/100); formability good (57/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08135 HF-SA
Is N08135 easy to machine?
Treat as a nickel alloy: rigid setup, sharp positive-rake carbide, low speed (15–25 m/min) with heavy positive feed to cut beneath the work-hardened layer, flood high-pressure emulsion.
Can N08135 be welded?
GTAW/GMAW or SMAW with overalloyed Ni-Cr-Mo filler (ERNiCrMo-3/-4 or -13); low heat input, interpass < 150 °C, no preheat, back-purge with Ar to protect the root.
Can N08135 be formed, bent or molded?
Cold forms well but needs 1.5–2× the force of 304 and generous springback allowance; hot working 1150–900 °C followed by solution anneal ~1150–1200 °C and rapid quench.
What surface finishes work on N08135?
Pickle (HNO3-HF) or bead blast plus passivation after welding to restore the Cr-Mo passive film; electropolishing gives best pitting performance; not anodisable.
N08135 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 |
|---|---|---|
| Nihigh nickel content stabilises austenite and gives chloride-SCC resistance | 30 – 37 | 35 |
| Cr | 25 – 28 | 26.5 |
| Mo | 5.5 – 7 | 6.5 |
| Cu | 0 – 1 | 0.4 |
| Nsolid-solution strengthening + pitting resistance | 0.15 – 0.35 | 0.25 |
| Mn | 0 – 2 | 1 |
| Si | 0 – 0.6 | 0.3 |
| C | 0 – 0.03 | 0.02 |
| P | 0 – 0.03 | — |
| S | 0 – 0.02 | — |
| Febalance, approx. 28–33 % | balance | — |
N08135 HF-SA — frequently asked
What is N08135 HF-SA used for?
N08135 HF-SA is typically used for high-temperature exhaust components, boiler and superheater tubing, furnace fixtures and chemical process equipment exposed to elevated temperature. In short: heat plus acid resistance; between stainless and nickel alloys; solution-annealed austenitic tubing grade.
What is the yield strength of N08135 HF-SA?
N08135 HF-SA has a typical yield strength of 335 MPa (48.6 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 56% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is N08135 HF-SA easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Treat as a nickel alloy: rigid setup, sharp positive-rake carbide, low speed (15–25 m/min) with heavy positive feed to cut beneath the work-hardened layer, flood high-pressure emulsion.
Can N08135 HF-SA be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW or SMAW with overalloyed Ni-Cr-Mo filler (ERNiCrMo-3/-4 or -13); low heat input, interpass < 150 °C, no preheat, back-purge with Ar to protect the root.
What surface finishes work on N08135 HF-SA?
Pickle (HNO3-HF) or bead blast plus passivation after welding to restore the Cr-Mo passive film; electropolishing gives best pitting performance; not anodisable.
Can N08135 HF-SA be formed, bent or molded?
Cold forms well but needs 1.5–2× the force of 304 and generous springback allowance; hot working 1150–900 °C followed by solution anneal ~1150–1200 °C and rapid quench.
What is the maximum service temperature of N08135 HF-SA?
N08135 HF-SA is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N08135-SA and N08135-CW?
SA is the default condition — standard supply condition for plate, tube and bar — maximum corrosion resistance and ductility. CW: choose when higher yield strength is required (e.g. downhole tubing, springs, fasteners); corrosion resistance slightly reduced and SCC sensitivity increases with strain. Yield strength is 360 MPa in SA versus 700 MPa in CW.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM B622 / B619 / B564 — Nickel and Nickel-Alloy Tube, Pipe and Forgings — ASTM International (2023)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook — Heat-Resistant Materials / Nickel, Cobalt and Their Alloys — ASM International (2000)
- UNS — Metals & Alloys in the Unified Numbering System — SAE International / ASTM (2022)
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.