Stainless Steel 1.4584
EN 1.4584
1.4584 (GX2NiCrMoCu25-20-5, A744 CN7M) is a low-carbon, copper-bearing high-nickel cast austenitic stainless steel, the casting counterpart of Alloy 20, supplied solution treated (ST), ST+HIP, as-cast or centrifugally cast and solution treated.
Reference datasheet — 1.4584 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 ST condition
1.4584 tempers and conditions
1.4584 is supplied in 4 conditions, soft to hard. ST 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 |
|---|---|---|---|---|---|---|
STDefault Solution annealed | Standard delivery condition for all pressure and corrosion-service castings; dissolves carbides and σ/χ phases for full corrosion resistance. | 230 | 490 | 40 | 160 HB | 1.7 % IACS |
Hot isostatically pressed then solution annealed | Choose for thick-section or high-pressure pump/valve castings where shrinkage porosity must be closed and fatigue/impact scatter minimised. | 240 | 510 | 45 | 160 HB | 1.7 % IACS |
Spheroidize annealed | Only for non-corrosion structural or rough-machining stock; carbide/σ networks strongly reduce ductility and acid resistance, so not accepted by EN 10213 for pressure service. | 240 | 460 | 20 | 180 HB | 1.7 % IACS |
Centrifugally cast, solution annealed | Centrifugal tube/sleeve/ring product form with denser, finer structure; pick for acid-service pipe spools and pump liners. | 245 | 520 | 42 | 165 HB | 1.7 % IACS |
What is 1.4584?
1.4584 (GX2NiCrMoCu25-20-5, A744 CN7M) is a low-carbon, copper-bearing high-nickel cast austenitic stainless steel, the casting counterpart of Alloy 20, supplied solution treated (ST), ST+HIP, as-cast or centrifugally cast and solution treated. It is chosen for sulfuric and phosphoric acid handling, typically as sand, investment or centrifugal castings for pumps and valve bodies. Default properties are 230 MPa yield, 490 MPa tensile, 40 % elongation and 160 HB, with service limited to 400 °C and machinability around 30. Where chlorides dominate, 1.4588 (CK3MCuN) is the closer alternative. 1.4584 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,320°C (2,408 °F). 1.4584 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 99% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 190 GPa (27.6 Msi).
What is 1.4584 used for?
- Acid process pump casings
- Chemical valve bodies
- Sulfuric acid service impellers
- Phosphoric acid plant castings
- Pickling line pump components
- Agitator and mixer castings
- Fertilizer plant fittings
Advantages
- Good corrosion resistance — 85/100, better than 92% of stainless steel grades
Limitations
- Low strength — 230 MPa (33.4 ksi), worse than 99% 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
- 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
1.4584 properties
Typical room-temperature values for 1.4584-ST; bars are the position among stainless steel grades.
Physical3
1.4584 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical16
1.4584 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 99% of stainless steel grades. Elongation at break is 40% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
1.4584 is rated for continuous service to 400°C (752 °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 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
1.4584 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 92% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4584 takes about 65 MJ of energy and emits 5.5 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4584's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (75/100); formability fair (40/100).
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. 1.4584 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4584
Is 1.4584 easy to machine?
Tough and work-hardening — use rigid setups, sharp positive-rake carbide, heavy positive feed, low-to-moderate speed and copious flood coolant; never dwell or rub.
Can 1.4584 be welded?
Readily GTAW/SMAW welded with over-alloyed 385/904L or Ni-base (ERNiCrMo-3) filler; keep interpass below ~150 °C, low heat input, no preheat, and solution anneal + quench after major repair welds if full acid resistance is required.
Can 1.4584 be formed, bent or molded?
Sand and investment casting with generous risering and chills to counter the wide freezing range; limited cold straightening only, hot working 1150–1200 °C followed by rapid cooling.
1.4584 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 |
|---|---|---|
| Cultra-low carbon, intergranular corrosion control | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 19 – 21 | 20 |
| Ni | 24 – 26 | 25 |
| Mo | 4 – 5 | 4.5 |
| Cusulfuric-acid resistance; ACI CN7M variant runs 3.0–4.0 % Cu with 27.5–30.5 % Ni | 1 – 2 | 1.5 |
| Fe | balance |
What surface finishes work on 1.4584?
Pickle and passivate in HNO₃/HF after casting and welding to restore the passive film; grinds and polishes well, no anodising (n/a for stainless).
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 1.4584 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX2NiCrMoCu25-20-5
- Similar grades
- A744 CN7M
How much does 1.4584 cost?
1.4584 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.
1.4584 — frequently asked
What is 1.4584 used for?
1.4584 is typically used for acid process pump casings, chemical valve bodies, sulfuric acid service impellers, phosphoric acid plant castings, pickling line pump components and agitator and mixer castings. In short: alloy 20 casting equivalent; sulfuric acid service; copper-bearing austenitic casting.
What is the yield strength of 1.4584?
1.4584 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 99% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4584 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Tough and work-hardening — use rigid setups, sharp positive-rake carbide, heavy positive feed, low-to-moderate speed and copious flood coolant; never dwell or rub.
Can 1.4584 be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/SMAW welded with over-alloyed 385/904L or Ni-base (ERNiCrMo-3) filler; keep interpass below ~150 °C, low heat input, no preheat, and solution anneal + quench after major repair welds if full acid resistance is required.
What surface finishes work on 1.4584?
Pickle and passivate in HNO₃/HF after casting and welding to restore the passive film; grinds and polishes well, no anodising (n/a for stainless).
Can 1.4584 be formed, bent or molded?
Sand and investment casting with generous risering and chills to counter the wide freezing range; limited cold straightening only, hot working 1150–1200 °C followed by rapid cooling.
What is the maximum service temperature of 1.4584?
1.4584 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 1.4584-ST and 1.4584 CENT-ST?
ST is the default condition — standard delivery condition for all pressure and corrosion-service castings; dissolves carbides and σ/χ phases for full corrosion resistance. CENT-ST: centrifugal tube/sleeve/ring product form with denser, finer structure; pick for acid-service pipe spools and pump liners. Yield strength is 230 MPa in ST versus 245 MPa in CENT-ST.
How much does 1.4584 cost?
1.4584 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 10213 — Steel castings for pressure purposes — CEN (2016)
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- ASTM A744/A744M — Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service (CN7M) — ASTM (2018)
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts — ASTM (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (cast corrosion-resistant steels) — ASM International (1990)
- 904L / 1.4539 super-austenitic stainless steel datasheet — Outokumpu (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.