Stainless Steel 1.4821 +AT+P
Finish state
EN 1.4821
+AT+P = 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.
Values for the +AT+P condition
Other 1.4821 tempers and conditions
1.4821 is listed in 6 conditions; see the grade overview at 1.4821.
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 |
+AT+PThis page 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 +AT+P?
1.4821 +AT+P is 1.4821 supplied in the +AT+P condition — annealed bar with a machined (peeled) surface for direct machining of furnace fixtures and shafts without scale removal. 1.4821 +AT+P 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). 1.4821 +AT+P 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). +AT is the default condition FabDigit quotes; +AT+P is available on request or by drawing note.
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 +AT+P properties
Typical room-temperature values for 1.4821 +AT+P; 5 are specific to this condition. Other listed values are 1.4821 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4821 +AT+P 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 +AT+P 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 +AT+P 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 +AT+P 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 +AT+P 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 +AT+P's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability fair (35/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4821 +AT+P
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.
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.
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 | — |
1.4821 +AT+P — frequently asked
What is 1.4821 +AT+P used for?
1.4821 +AT+P 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 +AT+P?
1.4821 +AT+P 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 +AT+P 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 +AT+P 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 +AT+P?
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 +AT+P 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 +AT+P?
1.4821 +AT+P 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.