Stainless Steel 1.4527
EN 1.4527
1.4527 (GX4NiCrCuMo30-20-4, A744 CN7M) is a high-nickel cast stainless steel with copper and molybdenum additions, an Alloy 20-type casting grade.
Reference datasheet — 1.4527 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 condition
1.4527 tempers and conditions
1.4527 is supplied in 5 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard as-supplied condition for all pressure-retaining CN7M / 1.4527 castings; maximum corrosion resistance and ductility. | 215 | 480 | 45 | 150 HB | 1.6 % IACS |
Hot isostatically pressed then solution annealed | Choose for thick-section or radiographic-quality pump/valve castings where microporosity must be closed; slightly higher ductility and fatigue life. | 225 | 500 | 50 | 150 HB | 1.6 % IACS |
Spheroidize annealed | Only for non-corrosive, non-pressure hardware — interdendritic carbides and Cr-depleted zones sharply reduce acid resistance and ductility. | 230 | 470 | 25 | 165 HB | 1.6 % IACS |
As-welded deposit | Condition after minor foundry weld repair with Nb-stabilized filler when post-weld solution annealing is impractical; acceptable only for mild service. | 230 | 470 | 30 | 170 HB | 1.6 % IACS |
Centrifugally cast, solution annealed | Pipe, sleeve and bushing forms; the directionally solidified, denser wall gives modestly higher strength than static castings. | 235 | 510 | 42 | 155 HB | 1.6 % IACS |
What is 1.4527?
1.4527 (GX4NiCrCuMo30-20-4, A744 CN7M) is a high-nickel cast stainless steel with copper and molybdenum additions, an Alloy 20-type casting grade. It is chosen for concentrated sulfuric acid and strong reducing acid service and is poured as sand, investment or centrifugal castings, then solution annealed, with HIP and as-welded conditions also on file. Strength is modest (215 MPa yield, 480 MPa tensile, 45 % elongation, 150 HB), it work-hardens heavily during machining and service is limited to 425 °C. Corrosion resistance scores 78, below cast superaustenitics such as 1.4557 in chloride pitting duty. 1.4527 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F). 1.4527 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 100% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
What is 1.4527 used for?
- Sulfuric acid handling equipment
- Acid pump casings and impellers
- Chemical process castings
- Acid valve bodies
- Pickling line fittings
- Fertilizer plant components
Advantages
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Low strength — 215 MPa (31.2 ksi), worse than 100% of stainless steel grades
- Low electrical conductivity — 1.6 % IACS, worse than 99% of stainless steel grades
- Poor heat conductor — 12.3 W/m·K (7.11 BTU/hr·ft·°F), worse than 91% of stainless steel grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 83% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
1.4527 properties
Typical room-temperature values for 1.4527-SA; bars are the position among stainless steel grades.
Physical3
1.4527 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
1.4527 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 100% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
1.4527 is rated for continuous service to 425°C (797 °F). It conducts heat at 12.3 W/m·K (7.11 BTU/hr·ft·°F), worse than 91% of stainless steel grades. Thermal expansion is 14.8 µm/m·K (8.22 µin/in·°F).
Electrical3
1.4527 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 1.4527 takes about 78 MJ of energy and emits 5.6 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 55%.
Manufacturability8
1.4527's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (70/100); formability poor (30/100).
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. 1.4527 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4527
Is 1.4527 easy to machine?
Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, low speed (30–60 m/min) with heavy uninterrupted feeds and flood coolant to keep the cut below the hardened skin.
Can 1.4527 be welded?
Readily welded by GTAW/SMAW with Nb-stabilized 20Cb-3 (ER320LR/E320LR) filler, low heat input, no preheat; full solution anneal and water quench after major repair restores acid resistance.
Can 1.4527 be formed, bent or molded?
A casting grade — control pouring temperature (~1520–1560 °C) and provide large risers for the wide freezing range; avoid heavy section transitions to limit shrinkage porosity.
1.4527 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 |
|---|---|---|
| CEN 1.4527 limits C ≤ 0.06 | ≤ 0.07 | 0.04 |
| SiEN grade ≤ 1.0 | ≤ 1.5 | 0.9 |
| MnEN grade ≤ 2.0 | ≤ 1.5 | 0.9 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.04 | 0.02 |
| Cr | 19 – 22 | 20.5 |
| Ni | 27.5 – 30.5 | 29 |
| Mo | 2 – 3 | 2.5 |
| Cukey addition for sulfuric acid resistance | 3 – 4 | 3.5 |
| Febalance, approx. 42–45 % | balance |
What surface finishes work on 1.4527?
Pickle and passivate (nitric or nitric-HF) after heat treatment or grinding to remove scale and iron pickup; electropolishing gives the cleanest surface for acid service. 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 1.4527 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX4NiCrCuMo30-20-4
- Similar grades
- A744 CN7M
How much does 1.4527 cost?
1.4527 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.
1.4527 — frequently asked
What is 1.4527 used for?
1.4527 is typically used for sulfuric acid handling equipment, acid pump casings and impellers, chemical process castings, acid valve bodies, pickling line fittings and fertilizer plant components. In short: concentrated sulfuric acid castings; alloy 20 type casting; high elongation, low strength.
What is the yield strength of 1.4527?
1.4527 has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 100% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4527 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Gummy and strongly work-hardening — use rigid setups, positive-rake carbide, low speed (30–60 m/min) with heavy uninterrupted feeds and flood coolant to keep the cut below the hardened skin.
Can 1.4527 be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/SMAW with Nb-stabilized 20Cb-3 (ER320LR/E320LR) filler, low heat input, no preheat; full solution anneal and water quench after major repair restores acid resistance.
What surface finishes work on 1.4527?
Pickle and passivate (nitric or nitric-HF) after heat treatment or grinding to remove scale and iron pickup; electropolishing gives the cleanest surface for acid service. No anodizing.
Can 1.4527 be formed, bent or molded?
A casting grade — control pouring temperature (~1520–1560 °C) and provide large risers for the wide freezing range; avoid heavy section transitions to limit shrinkage porosity.
What is the maximum service temperature of 1.4527?
1.4527 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 1.4527-SA and 1.4527-CF?
SA is the default condition — standard as-supplied condition for all pressure-retaining CN7M / 1.4527 castings; maximum corrosion resistance and ductility. CF: pipe, sleeve and bushing forms; the directionally solidified, denser wall gives modestly higher strength than static castings. Yield strength is 215 MPa in SA versus 235 MPa in CF.
How much does 1.4527 cost?
1.4527 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
- ASTM A744/A744M — Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service (CN7M) — ASTM International (2023)
- ASTM A743/A351 cast corrosion-resistant grades — ASTM International (2021)
- EN 10213 / EN 10283 — Steel castings for pressure and corrosion-resistant purposes (GX4NiCrCuMo30-20-4, 1.4527) — CEN (2016)
- ASM Handbook Vol. 1: Properties and Selection — Cast Stainless Steels — ASM International (1990)
- Alloy 20 / N08020 physical and corrosion data — alloy producers (Carpenter, Sandvik) (2022)
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.