Stainless Steel S33425 Annealed
Temper · default condition
UNS S33425
Standard stocked condition for plate, sheet, bar, pipe and fittings — maximum ductility and best cyclic-oxidation life.
Values for the Annealed condition
Other S33425 tempers and conditions
S33425 is listed in 4 conditions; see the grade overview at S33425.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefaultThis page Annealed (solution annealed, 1050–1150 °C, rapid cool) | Standard stocked condition for plate, sheet, bar, pipe and fittings — maximum ductility and best cyclic-oxidation life. | 275 | 585 | 45 | 150 HB | — |
As-welded deposit | Joint condition for fabricated furnace hardware; use when a full post-weld solution anneal is impractical. | 300 | 560 | 32 | 170 HB | 1.7 % IACS |
Cold drawn | Small-diameter bar and fasteners where straightness, tolerance and higher room-temperature strength are wanted. | 500 | 720 | 25 | 17 HRC | 1.7 % IACS |
Cold worked 1/4-hard | Lightly temper-rolled strip/wire for springy clips, mesh and formed hardware; cold work is lost on first high-temperature exposure. | 590 | 790 | 20 | 22 HRC | 1.7 % IACS |
What is S33425 Annealed?
S33425 Annealed is S33425 in the Annealed temper — standard stocked condition for plate, sheet, bar, pipe and fittings — maximum ductility and best cyclic-oxidation life. S33425 Annealed has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 196 GPa (28.4 Msi). S33425 Annealed has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Advantages
- High service temperature — 1,150°C (2,102 °F), better than 99% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- High embodied carbon — 6.8 kg CO₂/kg, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Poor heat conductor — 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Low strength — 275 MPa (39.9 ksi), worse than 77% of stainless steel grades
S33425 Annealed properties
Typical room-temperature values for S33425 Annealed; 11 are specific to this condition. Other listed values are S33425 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S33425 Annealed has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical13
S33425 Annealed has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
S33425 Annealed is rated for continuous service to 1,150°C (2,102 °F). It conducts heat at 12.6 W/m·K (7.28 BTU/hr·ft·°F), worse than 88% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
S33425 Annealed conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of S33425 Annealed takes about 90 MJ of energy and emits 6.8 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
S33425 Annealed's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (68/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S33425 Annealed
Is S33425 easy to machine?
Treat as a high-nickel austenitic: rigid setup, positive-rake carbide, 20–35 m/min in turning, heavy feed, flood coolant and no dwelling — it work-hardens fast and its low conductivity concentrates heat at the edge.
Can S33425 be welded?
GTAW/GMAW/SMAW with matching 330 filler (or ERNiCr-3/A-alloy fillers for higher hot-crack safety); no preheat, low heat input, interpass below ~150 °C, and full solution anneal if the part will see 650–900 °C service.
Can S33425 be formed, bent or molded?
Formable cold in the annealed state but with a high work-hardening rate and marked springback — allow extra bend radius, use interstage anneals for deep draws; hot work at 1100–1200 °C and finish above ~950 °C.
What surface finishes work on S33425?
Pickle and passivate after hot work or welding to remove the tenacious Si-rich scale; brushed/polished or electropolished finishes are achievable, and aluminizing or Cr-diffusion coatings can extend life in aggressive carburizing service. Not anodizable.
S33425 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 weldability; heat-resistant variants may run to 0.10 | ≤ 0.08 | 0.05 |
| Sikey addition — forms adherent Si-rich sub-scale, boosts carburization resistance | 0.75 – 1.5 | 1.2 |
| Mn | ≤ 2 | 1.2 |
| P | ≤ 0.03 | 0.02 |
| Skept low — sulphur harms hot ductility of high-Ni alloys | ≤ 0.03 | 0.01 |
| Cr | 17 – 20 | 18.5 |
| Nistabilizes austenite and resists carbon/nitrogen pick-up | 33 – 37 | 35 |
| N | ≤ 0.1 | 0.03 |
| Febalance, ≈43–46 % | balance | — |
S33425 Annealed — frequently asked
What is S33425 Annealed used for?
S33425 Annealed is typically used for furnace fixtures, carburizing baskets and heat-treatment equipment. In short: carburization-resistant 330 type; 1150 °C service limit; furnace-fixture workhorse.
What is the yield strength of S33425 Annealed?
S33425 Annealed has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 77% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S33425 Annealed easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Treat as a high-nickel austenitic: rigid setup, positive-rake carbide, 20–35 m/min in turning, heavy feed, flood coolant and no dwelling — it work-hardens fast and its low conductivity concentrates heat at the edge.
Can S33425 Annealed be welded?
Yes — weldability is rated good (68/100). GTAW/GMAW/SMAW with matching 330 filler (or ERNiCr-3/A-alloy fillers for higher hot-crack safety); no preheat, low heat input, interpass below ~150 °C, and full solution anneal if the part will see 650–900 °C service.
What surface finishes work on S33425 Annealed?
Pickle and passivate after hot work or welding to remove the tenacious Si-rich scale; brushed/polished or electropolished finishes are achievable, and aluminizing or Cr-diffusion coatings can extend life in aggressive carburizing service. Not anodizable.
Can S33425 Annealed be formed, bent or molded?
Formable cold in the annealed state but with a high work-hardening rate and marked springback — allow extra bend radius, use interstage anneals for deep draws; hot work at 1100–1200 °C and finish above ~950 °C.
What is the maximum service temperature of S33425 Annealed?
S33425 Annealed is rated for continuous use to about 1,150°C (2,102 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S33425 Annealed and S33425-CD?
Annealed is the default condition — standard stocked condition for plate, sheet, bar, pipe and fittings — maximum ductility and best cyclic-oxidation life. CD: small-diameter bar and fasteners where straightness, tolerance and higher room-temperature strength are wanted. Yield strength is 275 MPa in Annealed versus 500 MPa in CD.
Sources
- ASTM B511 / B535 / B536 / B546 / B710 — Alloy N08330 bar, pipe, sheet, tube and wire — ASTM International (2019)
- ASTM A240/A480 — heat-resisting Cr-Ni plate, sheet and strip — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (heat-resistant austenitics) — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (high-temperature corrosion of Fe-Ni-Cr alloys) — ASM International (2005)
- Alloy 330 / RA330 heat-resistant alloy datasheet (typical physical and mechanical properties) — specialty alloy producer (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.