Stainless Steel E309LT-1
GB E309LT1-1
E309LT-1 (UNS W30923, E309LT1-1) is a rutile flux-cored tubular wire depositing over-alloyed 23Cr-12Ni austenitic-ferritic weld metal that tolerates dilution from carbon and low-alloy steels.
Reference datasheet — E309LT-1 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
E309LT-1 tempers and conditions
E309LT-1 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 |
|---|---|---|---|---|---|---|
Post-weld heat treated | Used when the carbon-steel side of a dissimilar joint mandates code stress relief; expect slightly lower ductility/toughness from ferrite transformation. | 400 | 570 | 33 | 195 HB | 2.2 % IACS |
AWDefault As-welded deposit | Standard supplied/tested condition: as-deposited weld metal with 8–15 FN ferrite, used for dissimilar joints and buttering layers. | 420 | 580 | 38 | 200 HB | — |
What is E309LT-1?
E309LT-1 (UNS W30923, E309LT1-1) is a rutile flux-cored tubular wire depositing over-alloyed 23Cr-12Ni austenitic-ferritic weld metal that tolerates dilution from carbon and low-alloy steels. It is the standard FCAW choice for dissimilar-metal joints, buttering layers and stainless overlay cladding, with deposits near 420 MPa yield, 580 MPa tensile, 38% elongation and 200 HB (92 HRB). Service is limited to 400 °C, the ferrite-bearing deposit is slightly magnetic, and corrosion resistance is scored 65; for straight 304/304L joints use E308LT-1 instead. E309LT-1 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). E309LT-1 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 197 GPa (28.6 Msi).
What is E309LT-1 used for?
- FCAW dissimilar metal joints (stainless to carbon steel)
- Stainless overlay cladding on carbon steel
- Buttering layers before 308L or 316L fill passes
- Clad plate seam and repair welds
- Transition joints in heat exchangers and vessels
- Heavy structural joints in mixed-material fabrications
Advantages
- Readily welded — 90/100, better than 95% of stainless steel grades
Limitations
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
E309LT-1 properties
Typical room-temperature values for E309LT-1-AW; bars are the position among stainless steel grades.
Physical3
E309LT-1 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical14
E309LT-1 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 38% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
E309LT-1 is rated for continuous service to 400°C (752 °F). It conducts heat at 15.5 W/m·K (8.96 BTU/hr·ft·°F), better than 53% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
E309LT-1 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of E309LT-1 takes about 60 MJ of energy and emits 5.5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 60%.
Manufacturability5
E309LT-1's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability excellent (90/100).
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. E309LT-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E309LT-1
Is E309LT-1 easy to machine?
Weld deposit machines like austenitic stainless — low speeds, heavy positive-rake carbide, rigid setup and flood coolant to avoid work hardening and chip welding.
Can E309LT-1 be welded?
FCAW with 100 % CO₂ (‑1 classification), DCEP, 22–30 V; T1 rutile slag gives all-position operation; keep interpass ≤150 °C and maintain 8–15 FN to avoid hot cracking in dissimilar joints.
Can E309LT-1 be formed, bent or molded?
Not a wrought product; deposited layers can be cold-planished lightly but heavy cold work embrittles the ferrite phase.
E309LT-1 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 |
|---|---|---|
| CL grade, low carbon | ≤ 0.04 | 0.03 |
| Cr | 22 – 25 | 23.5 |
| Ni | 12 – 14 | 13 |
| Mn | 0.5 – 2.5 | 1.4 |
| Si | ≤ 1 | 0.7 |
| Moresidual | ≤ 0.5 | 0.1 |
| Curesidual | ≤ 0.5 | 0.1 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Febalance, undiluted weld metal | balance |
What surface finishes work on E309LT-1?
Remove slag fully, then grind/pickle (HNO₃-HF paste) and passivate; ferrite makes the deposit slightly magnetic and it etches darker than 308L in polished cross-sections.
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 E309LT-1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- E309LT1-1
- Similar grades
- W30923
How much does E309LT-1 cost?
E309LT-1 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.
E309LT-1 — frequently asked
What is E309LT-1 used for?
E309LT-1 is typically used for FCAW dissimilar metal joints (stainless to carbon steel), stainless overlay cladding on carbon steel, buttering layers before 308L or 316L fill passes, clad plate seam and repair welds, transition joints in heat exchangers and vessels and heavy structural joints in mixed-material fabrications. In short: standard dissimilar-metal filler; over-alloyed against dilution; high-deposition cladding wire.
What is the yield strength of E309LT-1?
E309LT-1 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is E309LT-1 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Weld deposit machines like austenitic stainless — low speeds, heavy positive-rake carbide, rigid setup and flood coolant to avoid work hardening and chip welding.
Can E309LT-1 be welded?
Yes — weldability is rated excellent (90/100). FCAW with 100 % CO₂ (‑1 classification), DCEP, 22–30 V; T1 rutile slag gives all-position operation; keep interpass ≤150 °C and maintain 8–15 FN to avoid hot cracking in dissimilar joints.
What surface finishes work on E309LT-1?
Remove slag fully, then grind/pickle (HNO₃-HF paste) and passivate; ferrite makes the deposit slightly magnetic and it etches darker than 308L in polished cross-sections.
Can E309LT-1 be formed, bent or molded?
Not a wrought product; deposited layers can be cold-planished lightly but heavy cold work embrittles the ferrite phase.
What is the maximum service temperature of E309LT-1?
E309LT-1 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E309LT-1-AW and E309LT-1 PWHT?
AW is the default condition — standard supplied/tested condition: as-deposited weld metal with 8–15 FN ferrite, used for dissimilar joints and buttering layers. PWHT: used when the carbon-steel side of a dissimilar joint mandates code stress relief; expect slightly lower ductility/toughness from ferrite transformation. Yield strength is 420 MPa in AW versus 400 MPa in PWHT.
How much does E309LT-1 cost?
E309LT-1 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 A5.22/A5.22M — Stainless Steel Flux Cored and Metal Cored Welding Electrodes and Rods — AWS (2012)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- 309L flux-cored wire datasheets (Lincoln Electric, ESAB, Kobelco) — various (2023)
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.