Stainless Steel 1.4451
EN 1.4451
1.4451 (GX2CrNiMoCuN26-5-3-3) is a cast high-chromium stainless steel alloyed with molybdenum, copper and nitrogen, giving a duplex-leaning austenitic-ferritic structure.
Reference datasheet — 1.4451 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 SA+Q condition
1.4451 tempers and conditions
1.4451 is supplied in 4 conditions, soft to hard. SA+Q 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 |
|---|---|---|---|---|---|---|
Spheroidize annealed | Only for non-critical, non-corrosive or rough-machining-stock parts — intermetallics and nitrides in the as-cast structure cut toughness and corrosion resistance sharply. | 480 | 660 | 10 | 26 HRC | 2.1 % IACS |
SA+QDefault Solution annealed ~1080–1120 °C, water quenched | Standard delivery condition for all pressure- and corrosion-service castings; balances ferrite/austenite and dissolves σ-phase and Cr-nitrides. | 510 | 700 | 22 | 23 HRC | 2.2 % IACS |
Hot isostatically pressed, then solution annealed and quenched | Choose for thick-wall pumps/valves needing closed micro-shrinkage, better ductility and toughness and radiographic soundness. | 530 | 730 | 27 | 24 HRC | 2.2 % IACS |
Centrifugally cast tube/ring, solution annealed and quenched | Pick for cylinder liners, seal rings and pipe spools where the denser, finer centrifugal structure raises strength and soundness. | 540 | 740 | 24 | 24 HRC | 2.2 % IACS |
What is 1.4451?
1.4451 (GX2CrNiMoCuN26-5-3-3) is a cast high-chromium stainless steel alloyed with molybdenum, copper and nitrogen, giving a duplex-leaning austenitic-ferritic structure. It is selected for aggressive chloride and sulfuric-acid environments and is supplied as sand or centrifugal castings, solution annealed and quenched, with HIP available. The default condition gives 510 MPa yield, 700 MPa tensile, 22 % elongation and 245 HB; service is limited to about 280 °C and machinability is low (score 30). Where austenitic ductility and higher chloride pitting resistance matter more than strength, cast 1.4557 (CK3MCuN) is the nearer choice. 1.4451 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.4451 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 78% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4451 used for?
- seawater valve bodies
- flue-gas desulfurization castings
- chemical pumps
Advantages
- Good corrosion resistance — 82/100, better than 90% of stainless steel grades
- High strength — 510 MPa (74 ksi), better than 78% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 79% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
1.4451 properties
Typical room-temperature values for 1.4451-SA+Q; bars are the position among stainless steel grades.
Physical3
1.4451 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
1.4451 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 78% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4451 is rated for continuous service to 280°C (536 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
1.4451 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 90% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4451 takes about 55 MJ of energy and emits 4.6 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 75%.
Manufacturability7
1.4451's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability good (55/100); formability poor (25/100).
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. 1.4451 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4451
Is 1.4451 easy to machine?
Work-hardens and runs hot: use rigid setups, sharp coated carbide, low speed / high positive feed, generous flood coolant and avoid dwelling.
Can 1.4451 be welded?
Weldable with matching 25Cr super-duplex or 25-9-4 filler; keep interpass below ~150 °C, control heat input for a balanced ferrite/austenite weld, and re-solution-anneal heavily repaired castings.
Can 1.4451 be formed, bent or molded?
Supplied as sand or centrifugal castings — design generous fillets and directional feeding for the wide freezing range; cold forming is not applicable.
1.4451 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 cast grade | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 1.5 | 0.8 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 25 – 27 | 26 |
| Ni | 4.5 – 6 | 5.2 |
| Mo | 2.5 – 3.5 | 3 |
| Cuimproves resistance in sulfuric acid | 2.5 – 3.5 | 3 |
| Naustenite stabiliser, raises PREN | 0.12 – 0.25 | 0.18 |
| Fe | balance |
What surface finishes work on 1.4451?
Pickle and passivate after grinding or welding to restore the passive film; takes a good mechanical polish but no anodizing.
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 1.4451 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX2CrNiMoCuN26-5-3-3
How much does 1.4451 cost?
1.4451 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.
1.4451 — frequently asked
What is 1.4451 used for?
1.4451 is typically used for seawater valve bodies, flue-gas desulfurization castings and chemical pumps. In short: highest-strength cast stainless here; chloride and sulfuric acid service; duplex-leaning cast structure.
What is the yield strength of 1.4451?
1.4451 has a typical yield strength of 510 MPa (74 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 78% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4451 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Work-hardens and runs hot: use rigid setups, sharp coated carbide, low speed / high positive feed, generous flood coolant and avoid dwelling.
Can 1.4451 be welded?
Yes — weldability is rated good (55/100). Weldable with matching 25Cr super-duplex or 25-9-4 filler; keep interpass below ~150 °C, control heat input for a balanced ferrite/austenite weld, and re-solution-anneal heavily repaired castings.
What surface finishes work on 1.4451?
Pickle and passivate after grinding or welding to restore the passive film; takes a good mechanical polish but no anodizing.
Can 1.4451 be formed, bent or molded?
Supplied as sand or centrifugal castings — design generous fillets and directional feeding for the wide freezing range; cold forming is not applicable.
What is the maximum service temperature of 1.4451?
1.4451 is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4451 SA+Q and 1.4451-AC?
SA+Q is the default condition — standard delivery condition for all pressure- and corrosion-service castings; balances ferrite/austenite and dissolves σ-phase and Cr-nitrides. AC: only for non-critical, non-corrosive or rough-machining-stock parts — intermetallics and nitrides in the as-cast structure cut toughness and corrosion resistance sharply. Yield strength is 510 MPa in SA+Q versus 480 MPa in AC.
How much does 1.4451 cost?
1.4451 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
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- ASTM A890/A890M — Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Grade 1B / CD4MCuN) — ASTM (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America / ASM (1995)
- Cast super duplex (CD4MCuN / 1.4517 class) pump and valve casting datasheets — various foundries (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.