Stainless Steel 1.4309
EN 1.4309 · UNS J92500 · ASTM CF3
1.4309 (GX2CrNi19-11) is the extra-low-carbon European cast equivalent of 304L, listed as CF3 / J92500.
Reference datasheet — 1.4309 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 AT condition
1.4309 tempers and conditions
1.4309 is supplied in 4 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Only for non-critical, non-corrosive duty or as an intermediate state before machining and heat treatment. | 245 | 500 | 40 | 150 HB | 2.3 % IACS |
ATDefault Solution annealed ~1050 °C and water quenched | Default and virtually the only shipped condition — restores full corrosion resistance and ductility after casting. | 250 | 520 | 55 | 140 HB | — |
hot isostatically pressed then solution annealed | Choose for pressure-tight, radiographically clean valve/pump bodies and cryogenic parts where porosity must be closed. | 255 | 535 | 60 | 140 HB | 2.4 % IACS |
centrifugally cast, solution annealed (ASTM A451/A452 style) | Pick for tubes, sleeves and rings where the fine, dense centrifugal structure gives slightly higher strength and soundness. | 265 | 545 | 50 | 150 HB | 2.3 % IACS |
What is 1.4309?
1.4309 (GX2CrNi19-11) is the extra-low-carbon European cast equivalent of 304L, listed as CF3 / J92500. It is specified where castings are welded into assemblies or used as-cast, because the low carbon avoids sensitisation and intergranular corrosion without re-annealing; typical values are 250 MPa yield, 520 MPa tensile, 55 % elongation and 140 HB (78 HRB), with a corrosion-resistance score of 62. It is supplied as sand, investment, centrifugal or HIP + annealed castings. Service temperature is limited to 425 °C and chloride pitting resistance is modest — move to 1.4409 (CF3M) for chlorides, or 1.4308 (CF8) for hot service. 1.4309 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). 1.4309 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 55% and the elastic modulus is 195 GPa (28.3 Msi).
What is 1.4309 used for?
- welded pump/valve castings
- food and pharmaceutical equipment
- cryogenic fittings
Advantages
- Readily welded — 92/100, better than 98% of stainless steel grades
- Ductile — tolerates forming and impact — 55%, better than 97% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
Limitations
- Low strength — 250 MPa (36.3 ksi), worse than 91% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
1.4309 properties
Typical room-temperature values for 1.4309-AT; bars are the position among stainless steel grades.
Physical3
1.4309 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).
Mechanical16
1.4309 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 55% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4309 is rated for continuous service to 425°C (797 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4309 conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4309 takes about 55 MJ of energy and emits 4.8 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 75%.
Manufacturability7
1.4309's machinability is fair (42/100, better than 79% of stainless steel grades); weldability excellent (92/100).
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. 1.4309 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4309
Is 1.4309 easy to machine?
Gummy and work-hardening — use sharp positive-rake carbide, rigid setups, heavy positive feed, ~40 % of 1212 speeds and copious coolant; avoid dwelling in the cut.
Can 1.4309 be welded?
Excellent — GTAW/SMAW with ER308L/E308L filler, no preheat and no PWHT required; keep interpass <150 °C and maintain 5–15 FN ferrite to avoid hot cracking.
Can 1.4309 be formed, bent or molded?
Sand or investment cast with generous feeding (long freezing range, ~2.3 % solidification shrinkage); solution anneal at 1040–1100 °C and water quench after casting or weld repair.
1.4309 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 |
|---|---|---|
| Cextra-low carbon, key to intergranular corrosion resistance | ≤ 0.03 | 0.02 |
| SiEN 10283 ≤1.5; ASTM A351 CF3 allows ≤2.00 | ≤ 1.5 | 1 |
| MnASTM CF3 ≤1.50 | ≤ 1.5 | 1 |
| P | ≤ 0.04 | 0.03 |
| SASTM A351 CF3 ≤0.040 | ≤ 0.03 | 0.02 |
| CrASTM CF3 range 17.0–21.0 | 18 – 20 | 19 |
| NiASTM CF3 range 8.0–12.0 | 9 – 12 | 10.5 |
| Moresidual only | ≤ 0.5 | 0.2 |
| Nresidual/optional; higher N raises yield | ≤ 0.2 | 0.05 |
| Fe | balance |
What surface finishes work on 1.4309?
Pickle and passivate (ASTM A967) or electropolish; not anodisable — bead blasting, grinding and mechanical polish are limited by casting skin and micro-porosity.
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 1.4309 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J92500
- ASTM
- CF3
- EN / DIN / Werkstoff-Nr.
- GX2CrNi19-11
How much does 1.4309 cost?
1.4309 is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
1.4309 — frequently asked
What is 1.4309 used for?
1.4309 is typically used for welded pump/valve castings, food and pharmaceutical equipment and cryogenic fittings. In short: best as-welded corrosion resistance; extra-low-carbon cast 304L; good cryogenic toughness.
What is the yield strength of 1.4309?
1.4309 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 91% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4309 easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Gummy and work-hardening — use sharp positive-rake carbide, rigid setups, heavy positive feed, ~40 % of 1212 speeds and copious coolant; avoid dwelling in the cut.
Can 1.4309 be welded?
Yes — weldability is rated excellent (92/100). Excellent — GTAW/SMAW with ER308L/E308L filler, no preheat and no PWHT required; keep interpass <150 °C and maintain 5–15 FN ferrite to avoid hot cracking.
What surface finishes work on 1.4309?
Pickle and passivate (ASTM A967) or electropolish; not anodisable — bead blasting, grinding and mechanical polish are limited by casting skin and micro-porosity.
Can 1.4309 be formed, bent or molded?
Sand or investment cast with generous feeding (long freezing range, ~2.3 % solidification shrinkage); solution anneal at 1040–1100 °C and water quench after casting or weld repair.
What is the maximum service temperature of 1.4309?
1.4309 is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4309-AT and 1.4309-F?
AT is the default condition — default and virtually the only shipped condition — restores full corrosion resistance and ductility after casting. F: only for non-critical, non-corrosive duty or as an intermediate state before machining and heat treatment. Yield strength is 250 MPa in AT versus 245 MPa in F.
How much does 1.4309 cost?
1.4309 is a premium-cost stainless steel ($$$), cheaper than about 51% 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
- EN 10283 — Corrosion resistant steel castings (GX2CrNi19-11, 1.4309) — CEN (2010)
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts (CF3) — ASTM (2018)
- ASTM A743/A743M — Castings, Iron-Chromium-Nickel, Corrosion Resistant (CF3) — ASTM (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Cast Stainless Steels) — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.