Stainless Steel S35115
UNS S35115
S35115 is a high-nickel austenitic stainless steel alloyed with molybdenum and copper for hot sulfuric and phosphoric acid service in chemical processing equipment.
Reference datasheet — S35115 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the Annealed condition
S35115 tempers and conditions
S35115 is supplied in 4 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed and quenched (mill anneal) | Standard supply condition for plate, sheet, pipe and bar in acid service — maximum corrosion resistance and ductility. | 265 | 600 | 45 | 165 HB | 1.7 % IACS |
As-welded deposit | Welded tube and fabricated joints; post-weld solution anneal is strongly recommended before hot-acid exposure to restore the passive film and remove segregation. | 280 | 580 | 35 | 175 HB | 1.7 % IACS |
Cold drawn | Bar stock for pump shafts, fasteners and valve internals where higher yield strength and better surface finish are needed. | 480 | 720 | 25 | 18 HRC | 1.7 % IACS |
Quarter hard | Choose when moderate spring-back and higher yield strength are needed in thin strip; corrosion resistance is essentially unchanged but residual stress raises SCC sensitivity. | 520 | 780 | 20 | 21 HRC | 1.7 % IACS |
Supply forms, finishes and certifications
Ways S35115 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CRA | Cold Rolled and Annealed | Surface finish |
HRAP | Hot Rolled, Annealed and Pickled | Surface finish |
What is S35115?
S35115 is a high-nickel austenitic stainless steel alloyed with molybdenum and copper for hot sulfuric and phosphoric acid service in chemical processing equipment. Annealed material is rated at 265 MPa yield, 600 MPa tensile and 45% elongation at 165 HB (85 HRB), with internal ratings of 82/100 for corrosion resistance and 70/100 for formability; it is stocked annealed, hot-rolled annealed and pickled, cold-rolled annealed, cold drawn, quarter hard and as-welded. The nickel-molybdenum-copper content makes the grade expensive and slow to machine, and welds need over-alloyed nickel-base filler. For less aggressive acid duty 316L is the cheaper option. S35115 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,340°C (2,444 °F). S35115 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 81% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
What is S35115 used for?
- Sulfuric and phosphoric acid processing equipment
- Chemical plant components
- Acid tank and vessel linings
- Heat exchanger tubing and tubesheets
- Pump and valve internals for acid service
- Piping and fittings in acid circuits
- Fertilizer plant hardware
Advantages
- Good corrosion resistance — 82/100, better than 90% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Poor heat conductor — 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Low strength — 265 MPa (38.4 ksi), worse than 81% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
S35115 properties
Typical room-temperature values for S35115-Annealed; bars are the position among stainless steel grades.
Physical3
S35115 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,340°C (2,444 °F).
Mechanical16
S35115 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 81% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
S35115 is rated for continuous service to 500°C (932 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical3
S35115 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is very good (82/100), better than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of S35115 takes about 65 MJ of energy and emits 5.5 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 50%.
Manufacturability7
S35115's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (70/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. S35115 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S35115
Is S35115 easy to machine?
Gummy and strongly work hardening — use rigid setups, positive-rake carbide, heavy positive feed to stay under the hardened skin, and copious high-pressure coolant; expect ~25 % of 1212 speeds.
Can S35115 be welded?
GTAW/GMAW/SMAW with an over-alloyed Ni-base filler (e.g. ERNiCrMo type) to offset Mo segregation; keep interpass below ~150 °C, no preheat, and solution-anneal + pickle for the most aggressive hot-acid duty.
Can S35115 be formed, bent or molded?
Cold forms well but needs roughly 50 % more press force than 304 and generous bend radii; hot work in a narrow window around 1100–1180 °C followed by rapid water quench.
S35115 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 austenitic practice; verify against the governing product standard | ≤ 0.03 | 0.02 |
| Crclass-typical range for this acid-resistant austenitic family; confirm per standard | 20 – 27 | 23 |
| Nihigh-nickel base for reducing-acid and chloride SCC resistance | 20 – 32 | 25 |
| Morange class-typical; exact limits per governing standard | 2 – 7 | 4 |
| Cudeliberate addition for hot sulfuric/phosphoric acid service | 0.5 – 2 | 1.2 |
| Mn | ≤ 2 | 1 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.03 | |
| S | ≤ 0.01 | |
| Fe | balance |
What surface finishes work on S35115?
Pickle in HNO₃/HF then passivate per ASTM A967, or electropolish; never anodize, and remove all embedded iron and weld heat tint before acid exposure.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
How much does S35115 cost?
S35115 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S35115 — frequently asked
What is S35115 used for?
S35115 is typically used for sulfuric and phosphoric acid processing equipment, chemical plant components, acid tank and vessel linings, heat exchanger tubing and tubesheets, pump and valve internals for acid service and piping and fittings in acid circuits. In short: hot sulfuric acid grade; mo and Cu bearing austenitic; needs Ni-base weld filler.
What is the yield strength of S35115?
S35115 has a typical yield strength of 265 MPa (38.4 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 81% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S35115 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Gummy and strongly work hardening — use rigid setups, positive-rake carbide, heavy positive feed to stay under the hardened skin, and copious high-pressure coolant; expect ~25 % of 1212 speeds.
Can S35115 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with an over-alloyed Ni-base filler (e.g. ERNiCrMo type) to offset Mo segregation; keep interpass below ~150 °C, no preheat, and solution-anneal + pickle for the most aggressive hot-acid duty.
What surface finishes work on S35115?
Pickle in HNO₃/HF then passivate per ASTM A967, or electropolish; never anodize, and remove all embedded iron and weld heat tint before acid exposure.
Can S35115 be formed, bent or molded?
Cold forms well but needs roughly 50 % more press force than 304 and generous bend radii; hot work in a narrow window around 1100–1180 °C followed by rapid water quench.
What is the maximum service temperature of S35115?
S35115 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S35115 Annealed and S35115-CD?
Annealed is the default condition — standard supply condition for plate, sheet, pipe and bar in acid service — maximum corrosion resistance and ductility. CD: bar stock for pump shafts, fasteners and valve internals where higher yield strength and better surface finish are needed. Yield strength is 265 MPa in Annealed versus 480 MPa in CD.
How much does S35115 cost?
S35115 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM (2022)
- SAE/ASTM DS-56 — Metals & Alloys in the Unified Numbering System (UNS) — SAE International / ASTM (2017)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.