Stainless Steel ER383-AW (As-welded deposit)
Heat-treated state · default condition
UNS N08028
Default condition: deposit used as welded, no post-weld heat treatment, for acid-service superaustenitic joints.
Values for the AW condition
Other ER383 tempers and conditions
ER383 is listed in 2 conditions; see the grade overview at ER383.
- SA
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Deposit solution annealed | Pick when the fabrication is solution annealed after welding to dissolve segregation and restore maximum acid-corrosion resistance. | 260 | 570 | 45 | 160 HB | 1.7 % IACS |
AWDefaultThis page As-welded deposit | Default condition: deposit used as welded, no post-weld heat treatment, for acid-service superaustenitic joints. | 390 | 600 | 38 | 185 HB | 1.7 % IACS |
What is ER383-AW?
ER383-AW is ER383 heat treated to AW — default condition: deposit used as welded, no post-weld heat treatment, for acid-service superaustenitic joints. ER383-AW has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 54% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 195 GPa (28.3 Msi). ER383-AW has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Advantages
- Good corrosion resistance — 83/100, better than 91% of stainless steel grades
Limitations
- 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
- 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
ER383-AW properties
Typical room-temperature values for ER383-AW; 22 are specific to this condition. Other listed values are ER383 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
ER383-AW has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical15
ER383-AW has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 54% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
ER383-AW is rated for continuous service to 550°C (1,022 °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 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
ER383-AW conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (83/100), better than 91% of stainless steel grades.
Sustainability4
Producing a kilogram of ER383-AW takes about 95 MJ of energy and emits 7.5 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
ER383-AW's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability very good (70/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ER383-AW
Is ER383 easy to machine?
Weld deposit machines like a high-Ni austenitic: low speed, heavy positive-rake carbide, rigid setup and flood coolant to avoid work hardening and built-up edge.
Can ER383 be welded?
GTAW/GMAW/SAW with 100 % Ar or Ar-He shielding, low heat input (<1.5 kJ/mm), interpass below 100–150 °C, back purge required; fully austenitic solidification makes it hot-crack sensitive, so keep S/P low and avoid concave beads.
Can ER383 be formed, bent or molded?
Supplied as drawn wire; deposits cold-form well with high work hardening — allow generous bend radii and expect high springback.
What surface finishes work on ER383?
Pickle and passivate (HNO₃-HF) or bead-blast plus passivation after welding to remove heat tint; no anodizing, electropolishing gives the best acid-service surface.
ER383 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 | ≤ 0.03 | 0.02 |
| Cr | 26.5 – 28.5 | 27.5 |
| Ni | 30 – 33 | 31 |
| Mo | 3.2 – 4.2 | 3.6 |
| Cusulphuric-acid resistance | 0.6 – 1.5 | 1 |
| Mn | 1 – 2.5 | 1.7 |
| Si | ≤ 0.5 | 0.3 |
| Pkept low against hot cracking | ≤ 0.02 | 0.01 |
| Skept low against hot cracking | ≤ 0.03 | 0.01 |
| Febalance, typically ~33–36 % | balance | — |
ER383-AW — frequently asked
What is ER383-AW used for?
ER383-AW is typically used for sulfuric and phosphoric acid plant piping and vessels, flue-gas desulfurization scrubbers and ducting, acid pickling line tanks and internals, alloy 28 heat exchanger tube-to-tubesheet welds, corrosion-resistant weld overlay on carbon steel vessels and pumps and valve bodies in acid service. In short: acid-service superaustenitic filler; highest corrosion score in family; alloy 28 chemistry match.
What is the yield strength of ER383-AW?
ER383-AW has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 54% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is ER383-AW easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Weld deposit machines like a high-Ni austenitic: low speed, heavy positive-rake carbide, rigid setup and flood coolant to avoid work hardening and built-up edge.
Can ER383-AW be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SAW with 100 % Ar or Ar-He shielding, low heat input (<1.5 kJ/mm), interpass below 100–150 °C, back purge required; fully austenitic solidification makes it hot-crack sensitive, so keep S/P low and avoid concave beads.
What surface finishes work on ER383-AW?
Pickle and passivate (HNO₃-HF) or bead-blast plus passivation after welding to remove heat tint; no anodizing, electropolishing gives the best acid-service surface.
Can ER383-AW be formed, bent or molded?
Supplied as drawn wire; deposits cold-form well with high work hardening — allow generous bend radii and expect high springback.
What is the maximum service temperature of ER383-AW?
ER383-AW is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER383-AW and ER383-SA?
AW is the default condition — default condition: deposit used as welded, no post-weld heat treatment, for acid-service superaustenitic joints. SA: pick when the fabrication is solution annealed after welding to dissolve segregation and restore maximum acid-corrosion resistance. Yield strength is 390 MPa in AW versus 260 MPa in SA.
Sources
- AWS A5.9/A5.9M — Bare Stainless Steel Welding Electrodes and Rods — AWS (2017)
- ASTM A959 / UNS N08028 designation data — ASTM (2020)
- Sanicro 28 (UNS N08028) alloy datasheet — Alleima (Sandvik Materials Technology) (2023)
- Superaustenitic filler metal data sheets (ER383/ER385) — voestalpine Böhler Welding / Lincoln Electric (2022)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
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.