Stainless Steel S35115-AW (As-welded deposit)
Heat-treated state
UNS S35115
Welded tube and fabricated joints; post-weld solution anneal is strongly recommended before hot-acid exposure to restore the passive film and remove segregation.
Values for the AW condition
Other S35115 tempers and conditions
S35115 is listed in 4 conditions; see the grade overview at S35115.
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 |
AWThis page 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 |
What is S35115-AW?
S35115-AW is S35115 heat treated to AW — welded tube and fabricated joints; post-weld solution anneal is strongly recommended before hot-acid exposure to restore the passive film and remove segregation. S35115-AW has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 75% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 195 GPa (28.3 Msi). S35115-AW 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). Annealed is the default condition FabDigit quotes; AW is available on request or by drawing note.
Advantages
- Good corrosion resistance — 74/100, better than 78% 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
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
- Low strength — 280 MPa (40.6 ksi), worse than 75% of stainless steel grades
S35115-AW properties
Typical room-temperature values for S35115-AW; 22 are specific to this condition. Other listed values are S35115 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S35115-AW 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-AW has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 75% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
S35115-AW is rated for continuous service to 450°C (842 °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-AW conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is very good (74/100), better than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of S35115-AW 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-AW's machinability is poor (26/100, worse than 84% of stainless steel grades); weldability very good (70/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S35115-AW
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.
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.
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 | — |
S35115-AW — frequently asked
What is S35115-AW used for?
S35115-AW 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-AW?
S35115-AW has a typical yield strength of 280 MPa (40.6 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 75% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S35115-AW easy to machine?
Not especially — machinability is rated poor (26/100, worse than 84% 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-AW 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-AW?
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-AW 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-AW?
S35115-AW 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 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.