Steel ER80S-B8
UNS S50480
ER80S-B8 is a 9Cr-1Mo martensitic stainless solid filler wire (UNS S50480) matched to P9/T9 alloy steel for high-temperature, corrosion-resistant piping.
Reference datasheet — ER80S-B8 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 PWHT condition
ER80S-B8 tempers and conditions
ER80S-B8 is supplied in 3 conditions, soft to hard. PWHT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHTDefault Post-weld heat treated | Standard code condition for P9/T9 piping: tempers the martensite to meet AWS A5.28 80 ksi properties with usable toughness. | 490 | 620 | 22 | 16 HRC | — |
Normalized and tempered | Use when the whole fabrication or weld overlay is re-normalized and tempered, giving the most uniform tempered-martensite structure and best creep behaviour. | 500 | 650 | 24 | 17 HRC | — |
As-welded deposit | Pick only for temporary/non-code work or when a later PWHT is guaranteed — untempered martensite is hard, brittle and cold-crack prone. | 720 | 950 | 12 | 40 HRC | — |
What is ER80S-B8?
ER80S-B8 is a 9Cr-1Mo martensitic stainless solid filler wire (UNS S50480) matched to P9/T9 alloy steel for high-temperature, corrosion-resistant piping. Typical deposit properties are 490 MPa yield, 620 MPa tensile, 22 % elongation and about 200 HB (16 HRC) with service to 600 °C; conditions on file cover AW, PWHT and N+T. The as-deposited weld is crack-sensitive martensite near 40 HRC, so 200–300 °C preheat and 730–760 °C PWHT are required, machinability is low (38/100) and corrosion resistance (32/100) is limited by the 9 % Cr level. ER80S-B6 (5Cr-0.5Mo) is the lower-alloy alternative where P5 base metal is used. ER80S-B8 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F). ER80S-B8 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 61% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is ER80S-B8 used for?
- P9 piping welds
- high-temperature furnace tubing
- petrochemical reactor welding
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Good corrosion resistance — 32/100, better than 96% of steel grades
Limitations
- Low electrical conductivity — 3 % IACS, worse than 91% of steel grades
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades
- Difficult to machine — 38/100, worse than 80% of steel grades
ER80S-B8 properties
Typical room-temperature values for ER80S-B8-PWHT; bars are the position among steel grades.
Physical3
ER80S-B8 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
ER80S-B8 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 61% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
ER80S-B8 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
ER80S-B8 conducts electricity at 3 % IACS, worse than 91% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (32/100), better than 96% of steel grades.
Sustainability4
Producing a kilogram of ER80S-B8 takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
ER80S-B8's machinability is fair (38/100, worse than 80% of steel grades); weldability good (55/100); formability fair (45/100).
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 steel family
Yield strength against density for every steel grade FabDigit runs. ER80S-B8 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER80S-B8
Is ER80S-B8 easy to machine?
Machine only after PWHT/tempering; as-deposited martensite at ~40 HRC needs carbide tooling, low speed and rigid setups.
Can ER80S-B8 be welded?
GTAW/GMAW of P9/T9 with 200–300 °C preheat and interpass, low hydrogen practice, slow cooling and mandatory 730–760 °C PWHT to avoid hard, crack-sensitive martensite.
Can ER80S-B8 be formed, bent or molded?
Supplied as drawn wire or straightened cut lengths; the deposit itself is not cold formed — bend fabrication is done on the base pipe before welding.
ER80S-B8 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 |
|---|---|---|
| CAWS A5.28 max 0.10 | 0.05 – 0.1 | 0.08 |
| Mn | 0.4 – 0.7 | 0.55 |
| Si | 0.2 – 0.5 | 0.35 |
| Cr | 8 – 10.5 | 9 |
| Mo | 0.8 – 1.2 | 1 |
| Ni | ≤ 0.5 | 0.2 |
| Cu | ≤ 0.35 | 0.1 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Other elements, total | ≤ 0.5 | |
| Fe | balance |
What surface finishes work on ER80S-B8?
Grind/blast to remove chromium-rich oxide before painting or aluminizing; no anodizing, and passivation is not effective at only 9 % Cr.
Surface treatments FabDigit runs on 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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel ER80S-B8 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S50480
- Other
- ER55S-B8
How much does ER80S-B8 cost?
ER80S-B8 is a high-cost 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.
ER80S-B8 — frequently asked
What is ER80S-B8 used for?
ER80S-B8 is typically used for P9 piping welds, high-temperature furnace tubing and petrochemical reactor welding. In short: 9Cr-1Mo P9 matching filler; 600 °C creep-resistant deposit; hardest of the B-series wires.
What is the yield strength of ER80S-B8?
ER80S-B8 has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 61% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is ER80S-B8 easy to machine?
Not especially — machinability is rated fair (38/100, worse than 80% of steel grades). Machine only after PWHT/tempering; as-deposited martensite at ~40 HRC needs carbide tooling, low speed and rigid setups.
Can ER80S-B8 be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW of P9/T9 with 200–300 °C preheat and interpass, low hydrogen practice, slow cooling and mandatory 730–760 °C PWHT to avoid hard, crack-sensitive martensite.
What surface finishes work on ER80S-B8?
Grind/blast to remove chromium-rich oxide before painting or aluminizing; no anodizing, and passivation is not effective at only 9 % Cr.
Can ER80S-B8 be formed, bent or molded?
Supplied as drawn wire or straightened cut lengths; the deposit itself is not cold formed — bend fabrication is done on the base pipe before welding.
What is the maximum service temperature of ER80S-B8?
ER80S-B8 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER80S-B8 PWHT and ER80S-B8-AW?
PWHT is the default condition — standard code condition for P9/T9 piping: tempers the martensite to meet AWS A5.28 80 ksi properties with usable toughness. AW: pick only for temporary/non-code work or when a later PWHT is guaranteed — untempered martensite is hard, brittle and cold-crack prone. Yield strength is 490 MPa in PWHT versus 720 MPa in AW.
How much does ER80S-B8 cost?
ER80S-B8 is a high-cost 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
- AWS A5.28/A5.28M — Low-Alloy Steel Electrodes and Rods for Gas Shielded Arc Welding — AWS (2020)
- ASME BPVC Section II Part C, SFA-5.28 — ASME (2023)
- ASME BPVC Section II Part D — physical properties of 9Cr-1Mo materials — ASME (2023)
- ASTM A335/A213 — P9/T9 alloy steel pipe and tube — ASTM (2022)
- ASM Handbook Vol.1 — Properties of Cr-Mo Heat-Resistant Steels — ASM International (1990)
- 9Cr-1Mo (ER80S-B8 / ER505) TIG & MIG wire datasheets — Böhler Welding / ESAB / Lincoln Electric (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.