Steel ER80S-B6
UNS S50280
ER80S-B6 is a 5Cr-0.5Mo martensitic stainless solid filler wire (UNS S50280) used to weld P5 alloy steel components that need elevated-temperature corrosion and creep resistance.
Reference datasheet — ER80S-B6 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 PWHT745 condition
ER80S-B6 tempers and conditions
ER80S-B6 is supplied in 3 conditions, soft to hard. PWHT745 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 |
|---|---|---|---|---|---|---|
PWHT745Default PWHT 745 °C | Standard code condition for P5 piping and pressure parts — tempers the martensite to give the classified 80 ksi properties with good toughness and hardness below 225 HB. | 505 | 620 | 22 | 200 HB | — |
SR 705 °C | Choose when higher joint strength is needed and the code allows the lower end of the P5 PWHT band; toughness is lower than a full 745 °C temper. | 570 | 690 | 19 | 22 HRC | — |
As-welded deposit | Only for temporary/non-code work or hardfacing-type build-up; deposit is hard untempered martensite with low toughness and cracking risk. | 640 | 790 | 14 | 36 HRC | — |
What is ER80S-B6?
ER80S-B6 is a 5Cr-0.5Mo martensitic stainless solid filler wire (UNS S50280) used to weld P5 alloy steel components that need elevated-temperature corrosion and creep resistance. After PWHT the deposit gives 505 MPa yield, 620 MPa tensile, 22 % elongation and about 200 HB (93 HRB), with service to 600 °C; it is supplied as drawn spooled wire and cut GTAW rod, with AW, SR705 and PWHT745 conditions on file. The as-welded deposit is hard martensite, so preheat and 730–760 °C PWHT are effectively mandatory, machinability is moderate (45/100) and corrosion resistance (30/100) stays well below austenitic stainless. ER80S-B8 (9Cr-1Mo) is the next step up for hotter P9 lines. ER80S-B6 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,420°C (2,588 °F). ER80S-B6 has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 64% of steel grades. Elongation at break is 22% and the elastic modulus is 207 GPa (30 Msi).
What is ER80S-B6 used for?
- P5 alloy piping welds
- refinery furnace tube welding
- high-temperature corrosion resistant piping
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Good corrosion resistance — 30/100, better than 95% of steel grades
Limitations
- Low electrical conductivity — 3.2 % IACS, worse than 87% of steel grades
ER80S-B6 properties
Typical room-temperature values for ER80S-B6-PWHT745; bars are the position among steel grades.
Physical3
ER80S-B6 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
ER80S-B6 has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 64% of steel grades. Elongation at break is 22% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
ER80S-B6 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 73% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
ER80S-B6 conducts electricity at 3.2 % IACS, worse than 87% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 95% of steel grades.
Sustainability4
Producing a kilogram of ER80S-B6 takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 35%.
Manufacturability7
ER80S-B6's machinability is fair (45/100, worse than 65% of steel grades); weldability very good (70/100); 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-B6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER80S-B6
Is ER80S-B6 easy to machine?
Machine after PWHT (≤225 HB) with carbide tooling and rigid setups; as-welded martensite at 35+ HRC needs grinding rather than turning.
Can ER80S-B6 be welded?
GMAW/GTAW/SAW with Ar-based shielding; preheat 200–300 °C, interpass ≤350 °C, slow cool and PWHT at 730–760 °C, and keep the wire and joint dry to avoid hydrogen cracking.
Can ER80S-B6 be formed, bent or molded?
Supplied only as drawn/copper-free bright wire — no forming of the deposit; avoid cold straightening of un-tempered welds.
ER80S-B6 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 | ≤ 0.1 | 0.07 |
| Mn | 0.4 – 0.7 | 0.55 |
| Si | 0.05 – 0.5 | 0.35 |
| Cr | 4.5 – 6 | 5.2 |
| Mo | 0.45 – 0.65 | 0.55 |
| Niresidual | ≤ 0.6 | 0.1 |
| Cuincludes any coating | ≤ 0.35 | 0.1 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Vresidual, part of total-others limit | ≤ 0.05 | 0.01 |
| Fe | balance |
What surface finishes work on ER80S-B6?
Wire-brush or pickle the Cr-rich oxide film before painting; aluminizing or high-temperature silicone-aluminium paint is used for hot exterior service.
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-B6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S50280
- Other
- ER55S-B6
How much does ER80S-B6 cost?
ER80S-B6 is a premium-cost 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.
ER80S-B6 — frequently asked
What is ER80S-B6 used for?
ER80S-B6 is typically used for P5 alloy piping welds, refinery furnace tube welding and high-temperature corrosion resistant piping. In short: 5Cr-0.5Mo P5 matching filler; 600 °C service capability; PWHT-mandatory martensitic deposit.
What is the yield strength of ER80S-B6?
ER80S-B6 has a typical yield strength of 505 MPa (73.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 64% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is ER80S-B6 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine after PWHT (≤225 HB) with carbide tooling and rigid setups; as-welded martensite at 35+ HRC needs grinding rather than turning.
Can ER80S-B6 be welded?
Yes — weldability is rated very good (70/100). GMAW/GTAW/SAW with Ar-based shielding; preheat 200–300 °C, interpass ≤350 °C, slow cool and PWHT at 730–760 °C, and keep the wire and joint dry to avoid hydrogen cracking.
What surface finishes work on ER80S-B6?
Wire-brush or pickle the Cr-rich oxide film before painting; aluminizing or high-temperature silicone-aluminium paint is used for hot exterior service.
Can ER80S-B6 be formed, bent or molded?
Supplied only as drawn/copper-free bright wire — no forming of the deposit; avoid cold straightening of un-tempered welds.
What is the maximum service temperature of ER80S-B6?
ER80S-B6 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-B6 PWHT745 and ER80S-B6-AW?
PWHT745 is the default condition — standard code condition for P5 piping and pressure parts — tempers the martensite to give the classified 80 ksi properties with good toughness and hardness below 225 HB. AW: only for temporary/non-code work or hardfacing-type build-up; deposit is hard untempered martensite with low toughness and cracking risk. Yield strength is 505 MPa in PWHT745 versus 640 MPa in AW.
How much does ER80S-B6 cost?
ER80S-B6 is a premium-cost 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
- 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 — Properties (5Cr-0.5Mo) — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Cr-Mo steels) — ASM International (1993)
- 5Cr-0.5Mo solid welding wire datasheets (Lincoln, ESAB, Böhler, / ) — various (2024)
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.