Stainless Steel 1.4821
EN 1.4821
EN 1.4821 (X15CrNiSi25-4) is a high-silicon 25Cr-4Ni heat-resistant steel with a duplex ferritic-austenitic matrix and high carbon, used for furnace and combustion equipment up to about 1100 °C.
Reference datasheet — 1.4821 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
1.4821 tempers and conditions
1.4821 is supplied in 6 conditions, soft to hard. +AT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Slow-cooled annealed condition sometimes supplied on hot-rolled plate; slightly softer but more prone to precipitated phases than +AT. | 440 | 740 | 18 | 17 HRC | 1.9 % IACS |
Forged + solution annealed | Hot-forged rings, flanges and heavy furnace fittings, annealed after forging to restore the duplex structure. | 450 | 760 | 18 | 225 HB | — |
+ATDefault Solution annealed | Standard stocked condition for plate, bar and forgings: best available ductility and a homogeneous duplex structure before service at high temperature. | 470 | 780 | 20 | 20 HRC | 1.9 % IACS |
Solution annealed and peeled/turned bright bar | Annealed bar with a machined (peeled) surface for direct machining of furnace fixtures and shafts without scale removal. | 470 | 780 | 20 | 230 HB | — |
Hot rolled | Cheapest hot-rolled bar/plate for parts that will be heat treated or that go straight into high-temperature service where RT ductility is not critical. | 520 | 830 | 14 | 24 HRC | 1.9 % IACS |
Cold drawn | Cold-drawn small-diameter bar/wire for bolts, pins and burner nozzles needing tight tolerance and higher strength; ductility is low. | 700 | 920 | 10 | 30 HRC | 1.9 % IACS |
What is 1.4821?
EN 1.4821 (X15CrNiSi25-4) is a high-silicon 25Cr-4Ni heat-resistant steel with a duplex ferritic-austenitic matrix and high carbon, used for furnace and combustion equipment up to about 1100 °C. It is chosen for oxidation resistance and hot strength in cast, forged and hot-rolled parts, offering 470 MPa yield, 780 MPa tensile, 20% elongation and about 230 HB after solution annealing. Ductility and machinability are low (roughly 30% of AISI 1212) and welded joints lose ductility after high-temperature service; where better weldability and ductility are needed, fully austenitic 1.4841 is the usual alternative. 1.4821 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). 1.4821 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 74% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4821 used for?
- furnace grates
- kiln components
- heat treatment fixtures
- burner parts
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 96% of stainless steel grades
Limitations
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 91% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Difficult to weld — 35/100, worse than 86% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
1.4821 properties
Typical room-temperature values for 1.4821-+AT; bars are the position among stainless steel grades.
Physical3
1.4821 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
1.4821 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 74% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
1.4821 is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
1.4821 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental2
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4821 takes about 50 MJ of energy and emits 4.5 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.4821's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability fair (35/100); 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. 1.4821 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4821
Is 1.4821 easy to machine?
Machine slowly with rigid setups, sharp carbide tools, heavy positive feed and generous coolant — the high-carbon duplex matrix work-hardens and the Cr carbides are abrasive (~30 % of AISI 1212).
Can 1.4821 be welded?
Weldable with care by TIG/MMA using over-alloyed austenitic or matching 25Cr-Ni filler, 150–300 °C preheat and low heat input; post-weld solution anneal is preferred, and welded joints lose ductility after high-temperature service.
Can 1.4821 be formed, bent or molded?
Hot form at roughly 1150–950 °C followed by solution annealing; cold forming is limited to gentle bends because of the high yield strength and low ductility.
1.4821 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 |
|---|---|---|
| C | 0.1 – 0.2 | 0.15 |
| Siraises scaling resistance | 0.8 – 1.5 | 1.2 |
| Mn | ≤ 2 | 0.8 |
| P | ≤ 0.04 | — |
| S | ≤ 0.02 | — |
| Cr | 24.5 – 26 | 25.2 |
| Ni | 3.5 – 5.5 | 4.5 |
| Fe | balance | — |
What surface finishes work on 1.4821?
Pickle and passivate after annealing or welding to remove scale; can be ground and polished, but not anodised — service oxide (chromia) scale forms naturally in use.
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 1.4821 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X15CrNiSi25-4
How much does 1.4821 cost?
1.4821 is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4821 — frequently asked
What is 1.4821 used for?
1.4821 is typically used for furnace grates, kiln components, heat treatment fixtures and burner parts. In short: 1100 °C oxidation resistance; high-silicon heat-resisting duplex; furnace fixture workhorse.
What is the yield strength of 1.4821?
1.4821 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 74% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1.4821 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine slowly with rigid setups, sharp carbide tools, heavy positive feed and generous coolant — the high-carbon duplex matrix work-hardens and the Cr carbides are abrasive (~30 % of AISI 1212).
Can 1.4821 be welded?
With care — weldability is rated fair (35/100). Weldable with care by TIG/MMA using over-alloyed austenitic or matching 25Cr-Ni filler, 150–300 °C preheat and low heat input; post-weld solution anneal is preferred, and welded joints lose ductility after high-temperature service.
What surface finishes work on 1.4821?
Pickle and passivate after annealing or welding to remove scale; can be ground and polished, but not anodised — service oxide (chromia) scale forms naturally in use.
Can 1.4821 be formed, bent or molded?
Hot form at roughly 1150–950 °C followed by solution annealing; cold forming is limited to gentle bends because of the high yield strength and low ductility.
What is the maximum service temperature of 1.4821?
1.4821 is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1.4821 cost?
1.4821 is a premium-cost stainless steel ($$$), 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 10095 — Heat resisting steels and nickel alloys — CEN (2018)
- EN 10088-1 — Stainless steels: list of stainless steels — CEN (2014)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Heat-resisting steel 1.4821 (X15CrNiSi25-4) datasheet — European long-product mill (DEW/Zapp-type) (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.