Stainless Steel 1.4876-AW (As-welded deposit)
Heat-treated state
EN 1.4876 · UNS N08800 · ASTM B408/B409 · also Incoloy 800
Typical properties of a full-penetration weldment used as-welded; no post-weld heat treatment is normally required.
Values for the AW condition
Other 1.4876 tempers and conditions
1.4876 is listed in 8 conditions; see the grade overview at 1.4876.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
High-carbon, solution annealed ≥1150 °C, coarse grain | Dual-certified high-temperature version for ASME Code service above 600 °C where creep-rupture strength governs (furnace tubes, headers). | 220 | 520 | 45 | 130 HB | 1.7 % IACS |
Controlled C+N and Al+Ti, solution annealed coarse grain | Pick when the highest and most reproducible creep-rupture life in the 760–980 °C range is required (ethylene pyrolysis coils, reformer pigtails). | 230 | 530 | 45 | 135 HB | 1.7 % IACS |
ANNDefault Annealed | Standard stocked condition for plate, sheet, bar and tube where corrosion resistance and formability matter more than creep strength. | 250 | 550 | 43 | 140 HB | — |
Hot rolled / hot finished and annealed | Heavy plate and forged/hot-rolled bar supplied descaled and annealed; slightly coarser grain and marginally higher strength scatter than cold-finished stock. | 270 | 570 | 40 | 150 HB | 1.7 % IACS |
AWThis page As-welded deposit | Typical properties of a full-penetration weldment used as-welded; no post-weld heat treatment is normally required. | 300 | 560 | 35 | 165 HB | 1.7 % IACS |
Stress relieved | For cold-formed or machined parts needing dimensional stability and reduced SCC risk while keeping part of the cold-work strength. | 450 | 660 | 28 | 11 HRC | 1.7 % IACS |
Cold drawn | Higher strength, closer tolerance and better chip control for machined fittings and fasteners; reduced ductility and residual stresses. | 480 | 690 | 25 | 200 HB | — |
Cold worked, 1/4 hard | Use where springback/strength is needed in thin strip or tube while retaining some formability. | 560 | 760 | 15 | 21 HRC | 1.7 % IACS |
What is 1.4876-AW?
1.4876-AW is 1.4876 heat treated to AW — typical properties of a full-penetration weldment used as-welded; no post-weld heat treatment is normally required. 1.4876-AW has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 196 GPa (28.4 Msi). 1.4876-AW has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,357°C (2,475 °F). ANN is the default condition FabDigit quotes; AW is available on request or by drawing note.
Advantages
- High service temperature — 850°C (1,562 °F), better than 80% of stainless steel grades
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- High embodied carbon — 6.8 kg CO₂/kg, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
1.4876-AW properties
Typical room-temperature values for 1.4876-AW; 21 are specific to this condition. Other listed values are 1.4876 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4876-AW has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,357°C (2,475 °F).
Mechanical15
1.4876-AW has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal5
1.4876-AW is rated for continuous service to 850°C (1,562 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
1.4876-AW conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 54% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4876-AW takes about 100 MJ of energy and emits 6.8 kg of CO₂ — more than 98% of stainless steel grades. Typical recycled content is 35%.
Manufacturability7
1.4876-AW's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (78/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4876-AW
Is 1.4876 easy to machine?
Machine like a tough austenitic: rigid setup, positive-rake sharp carbide, 20–40 m/min, heavy constant feed to cut under the work-hardened layer, and copious sulphurised/emulsion coolant.
Can 1.4876 be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (Alloy 82) or ENiCrFe-3; keep heat input and interpass low, no preheat or PWHT needed, avoid sulphur-bearing contaminants on hot surfaces.
Can 1.4876 be formed, bent or molded?
Good cold formability (deep drawing, spinning, tube bending) but ~50 % higher forces and springback than 304; hot work at 900–1200 °C and anneal at ~980 °C (or ≥1150 °C for 800H/HT grain size).
What surface finishes work on 1.4876?
Pickle in HNO₃–HF or grit-blast plus passivation to remove Cr/Al-rich scale; not anodizable, mechanical polish or electropolish for hygienic and high-vacuum surfaces.
1.4876 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 |
|---|---|---|
| Ni | 30 – 35 | 32.5 |
| Cr | 19 – 23 | 21 |
| CEN 10095 X10NiCrAlTi32-21; ASTM B409 allows 0.10 max | 0.05 – 0.1 | 0.08 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 1 | 0.5 |
| Al | 0.15 – 0.6 | 0.4 |
| Ti | 0.15 – 0.6 | 0.4 |
| Cu | ≤ 0.75 | 0.3 |
| S | ≤ 0.02 | 0.01 |
| PEN limit | ≤ 0.03 | 0.02 |
| Febalance, 39.5 % min per ASTM B409 | ≥ 39.5 (balance) | — |
1.4876-AW — frequently asked
What is 1.4876-AW used for?
1.4876-AW is typically used for heat exchanger tubing, furnace muffles, chemical processing equipment and petrochemical reformer tubes. In short: baseline Alloy 800 grade; carburization-resistant to 850 °C; readily weldable heat-resistant alloy.
What is the yield strength of 1.4876-AW?
1.4876-AW has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 8 listed tempers.
Is 1.4876-AW easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Machine like a tough austenitic: rigid setup, positive-rake sharp carbide, 20–40 m/min, heavy constant feed to cut under the work-hardened layer, and copious sulphurised/emulsion coolant.
Can 1.4876-AW be welded?
Yes — weldability is rated very good (78/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (Alloy 82) or ENiCrFe-3; keep heat input and interpass low, no preheat or PWHT needed, avoid sulphur-bearing contaminants on hot surfaces.
What surface finishes work on 1.4876-AW?
Pickle in HNO₃–HF or grit-blast plus passivation to remove Cr/Al-rich scale; not anodizable, mechanical polish or electropolish for hygienic and high-vacuum surfaces.
Can 1.4876-AW be formed, bent or molded?
Good cold formability (deep drawing, spinning, tube bending) but ~50 % higher forces and springback than 304; hot work at 900–1200 °C and anneal at ~980 °C (or ≥1150 °C for 800H/HT grain size).
What is the maximum service temperature of 1.4876-AW?
1.4876-AW is rated for continuous use to about 850°C (1,562 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4876-ANN and 1.4876-CD?
ANN is the default condition — standard stocked condition for plate, sheet, bar and tube where corrosion resistance and formability matter more than creep strength. CD: higher strength, closer tolerance and better chip control for machined fittings and fasteners; reduced ductility and residual stresses. Yield strength is 250 MPa in ANN versus 480 MPa in CD.
Sources
- ASTM B409 / B408 — UNS N08800 Plate, Sheet, Strip and Bar — ASTM International (2023)
- EN 10095 — Heat resisting steels and nickel alloys (X10NiCrAlTi32-21, 1.4876) — CEN (2018)
- INCOLOY alloy 800 technical bulletin — Special Metals Corporation (2004)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASME BPVC Section II Part D — allowable stresses for N08800/N08810/N08811 — ASME (2023)
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.