Stainless Steel ER320LR
UNS N08022
ER320LR is the low-residual, low-ferrite version of ER320 bare wire (UNS N08022), an Alloy 20 type superaustenitic filler with controlled residual elements to minimize sigma-phase embrittlement and hot cracking.
Reference datasheet — ER320LR 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 AW condition
ER320LR tempers and conditions
ER320LR is supplied in 2 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Deposit/weldment solution annealed ~1120 °C + rapid quench | Pick when the fabricated component is solution annealed after welding to dissolve carbides/secondary phases and maximize acid corrosion resistance. | 300 | 560 | 42 | 155 HB | 1.6 % IACS |
AWDefault As-welded deposit | Default condition: properties of the undiluted deposit in the as-welded state, used for design of Alloy 20 joints. | 390 | 590 | 33 | 180 HB | 1.6 % IACS |
Supply forms, finishes and certifications
Ways ER320LR is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE | Bare filler wire as supplied | Supply form |
What is ER320LR?
ER320LR is the low-residual, low-ferrite version of ER320 bare wire (UNS N08022), an Alloy 20 type superaustenitic filler with controlled residual elements to minimize sigma-phase embrittlement and hot cracking. Engineers specify it for Alloy 20 vessels and piping where high weld ductility is required, and it is supplied as spooled wire and cut rod for GTAW, GMAW and SAW. As-welded deposits are about 390 MPa yield, 590 MPa tensile, 33 % elongation and 180 HB (88 HRB), with service listed to 450 C. The essentially ferrite-free deposit is crater-crack sensitive and the wire costs more than ER320. ER320LR has a density of 8.02 g/cm³ (0.29 lb/in³), heavier than 97% of stainless steel grades. It melts at 1,355°C (2,471 °F). ER320LR has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 590 MPa (85.6 ksi) — stronger than 54% of stainless steel grades. Elongation at break is 33% and the elastic modulus is 193 GPa (28 Msi).
What is ER320LR used for?
- Alloy 20 vessels requiring high-ductility welds
- Sulfuric acid processing piping
- Restrained multipass pressure vessel joints
- Alloy 20 pump and valve castings repair
- Acid storage and rail tank car linings
- Overlay on carbon steel in acid service
- Chemical plant heat exchanger welds
Advantages
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
Limitations
- Low electrical conductivity — 1.6 % IACS, worse than 99% of stainless steel grades
- High embodied carbon — 6.2 kg CO₂/kg, worse than 90% 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
ER320LR properties
Typical room-temperature values for ER320LR-AW; bars are the position among stainless steel grades.
Physical3
ER320LR has a density of 8.02 g/cm³ (0.29 lb/in³), heavier than 97% of stainless steel grades. It melts at 1,355°C (2,471 °F).
Mechanical16
ER320LR has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 590 MPa (85.6 ksi) — stronger than 54% of stainless steel grades. Elongation at break is 33% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
ER320LR is rated for continuous service to 450°C (842 °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 14.9 µm/m·K (8.28 µin/in·°F).
Electrical3
ER320LR conducts electricity at 1.6 % IACS, worse than 99% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of ER320LR takes about 78 MJ of energy and emits 6.2 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
ER320LR's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (78/100); 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. ER320LR is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER320LR
Is ER320LR easy to machine?
Deposit machines like Alloy 20: gummy and work-hardening — use rigid setups, positive-rake carbide, heavy feeds, low speeds and flood coolant.
Can ER320LR be welded?
GTAW/GMAW/SAW with low heat input, stringer beads, interpass ≤150 °C and pure Ar (or Ar+He) shielding; keep dilution from carbon steel low and avoid crater cracks in the essentially ferrite-free deposit.
Can ER320LR be formed, bent or molded?
Supplied as drawn wire; the deposit itself is highly ductile and cold-formable but work-hardens rapidly, so intermediate annealing is needed for severe forming.
ER320LR 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 to resist sensitization | ≤ 0.03 | 0.02 |
| Cr | 19 – 21 | 20 |
| Ni | 32 – 36 | 34 |
| Mo | 2 – 3 | 2.5 |
| Cu | 3 – 4 | 3.5 |
| NbNb (Cb) stabilizer, restricted range vs ER320 | 0.2 – 0.4 | 0.3 |
| Mn | 1.5 – 2 | 1.75 |
| Silow Si to reduce hot cracking | ≤ 0.15 | 0.1 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Ta | ≤ 0.03 | 0.02 |
| Feremainder, approx. 36–40 % | balance |
What surface finishes work on ER320LR?
Not anodizable — pickle to remove heat tint and passivate per ASTM A967; the fully austenitic surface polishes to a bright, non-magnetic finish.
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
Equivalent designations
Standards and trade names that resolve to Stainless Steel ER320LR in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N08022
How much does ER320LR cost?
ER320LR 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.
ER320LR — frequently asked
What is ER320LR used for?
ER320LR is typically used for alloy 20 vessels requiring high-ductility welds, sulfuric acid processing piping, restrained multipass pressure vessel joints, alloy 20 pump and valve castings repair, acid storage and rail tank car linings and overlay on carbon steel in acid service. In short: low-residual Alloy 20 filler; lower hot-cracking risk; ferrite-free ductile deposit.
What is the yield strength of ER320LR?
ER320LR has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 590 MPa (85.6 ksi) — stronger than 54% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is ER320LR easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Deposit machines like Alloy 20: gummy and work-hardening — use rigid setups, positive-rake carbide, heavy feeds, low speeds and flood coolant.
Can ER320LR be welded?
Yes — weldability is rated very good (78/100). GTAW/GMAW/SAW with low heat input, stringer beads, interpass ≤150 °C and pure Ar (or Ar+He) shielding; keep dilution from carbon steel low and avoid crater cracks in the essentially ferrite-free deposit.
What surface finishes work on ER320LR?
Not anodizable — pickle to remove heat tint and passivate per ASTM A967; the fully austenitic surface polishes to a bright, non-magnetic finish.
Can ER320LR be formed, bent or molded?
Supplied as drawn wire; the deposit itself is highly ductile and cold-formable but work-hardens rapidly, so intermediate annealing is needed for severe forming.
What is the maximum service temperature of ER320LR?
ER320LR 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 ER320LR-AW and ER320LR-SA?
AW is the default condition — default condition: properties of the undiluted deposit in the as-welded state, used for design of Alloy 20 joints. SA: pick when the fabricated component is solution annealed after welding to dissolve carbides/secondary phases and maximize acid corrosion resistance. Yield strength is 390 MPa in AW versus 300 MPa in SA.
How much does ER320LR cost?
ER320LR 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
- AWS A5.9/A5.9M — Bare Stainless Steel Welding Electrodes and Rods — American Welding Society (2017)
- ASTM A1016 / UNS N08022 designation listings (Metals & Alloys in the Unified Numbering System) — SAE/ASTM (2017)
- Alloy 20 / 20Cb-3 bar and welding consumable data — Carpenter Technology (2020)
- 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; 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.