Steel E80C-B8
E80C-B8 is a 9Cr-1Mo composite metal-cored electrode in the low-alloy flux-cored filler family, used where creep strength at high temperature governs the joint design.
Reference datasheet — E80C-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
E80C-B8 tempers and conditions
E80C-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 delivered/qualified condition: tempered martensite meeting AWS A5.29 E80C-B8 mechanical requirements; use for all pressure-part service. | 505 | 620 | 22 | 200 HB | — |
Normalized and tempered | Full re-normalizing and tempering of the weldment (e.g. shop-fabricated headers or repairs) to fully refine the deposit and match P9 base metal properties. | 520 | 640 | 24 | 15 HRC | 2.9 % IACS |
As-welded deposit | Condition immediately after welding — hard, low-toughness martensite; only acceptable as an intermediate state before mandatory PWHT. | 760 | 980 | 13 | 40 HRC | — |
What is E80C-B8?
E80C-B8 is a 9Cr-1Mo composite metal-cored electrode in the low-alloy flux-cored filler family, used where creep strength at high temperature governs the joint design. Deposits give 505 MPa yield, 620 MPa tensile, 22 % elongation and about 200 HB (93 HRB), with service to 600 °C on 9Cr-1Mo boiler tubing and superheater piping. Preheat of 200–300 °C and a mandatory PWHT at 730–760 °C for 1 h per 25 mm are required, and as-welded martensite near 40 HRC is difficult to machine. Ambient corrosion resistance is low (score 32); E80C-B6 covers lighter 5Cr-0.5Mo service. E80C-B8 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,425°C (2,597 °F). E80C-B8 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 213 GPa (30.9 Msi).
What is E80C-B8 used for?
- 9Cr-1Mo boiler tubing
- Power plant superheater piping
- Refinery high-temperature vessels
- Hydrocracker units
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
- 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
E80C-B8 properties
Typical room-temperature values for E80C-B8-PWHT; bars are the position among steel grades.
Physical3
E80C-B8 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical15
E80C-B8 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 213 GPa (30.9 Msi).
Thermal6
E80C-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 11.2 µm/m·K (6.22 µin/in·°F).
Electrical2
E80C-B8 has an electrical resistivity of 6×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (32/100), better than 96% of steel grades.
Sustainability4
Producing a kilogram of E80C-B8 takes about 32 MJ of energy and emits 2.6 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability6
E80C-B8's machinability is fair (42/100, worse than 73% of steel grades); weldability fair (50/100); 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 steel family
Yield strength against density for every steel grade FabDigit runs. E80C-B8 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E80C-B8
Is E80C-B8 easy to machine?
Machine only after PWHT (~200 HB); as-welded martensite at ~40 HRC needs carbide tooling, low speed and rigid setups.
Can E80C-B8 be welded?
Preheat 200–300 °C, interpass ≤ 350 °C, cool to 80–150 °C before a mandatory 730–760 °C / 1 h per 25 mm PWHT; use 75–80 %Ar/CO₂ or CO₂ per the classification and keep the wire dry.
Can E80C-B8 be formed, bent or molded?
Deposited metal is not intended for cold forming; any bending of welded assemblies should be done after PWHT with generous radii.
E80C-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 |
|---|---|---|
| Cdeposited metal | 0.05 – 0.12 | 0.09 |
| Mn | ≤ 1.25 | 0.8 |
| Si | ≤ 1 | 0.4 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 8 – 10.5 | 9 |
| Mo | 0.85 – 1.2 | 1 |
| Ni | ≤ 0.4 | 0.15 |
| Cu | ≤ 0.35 | 0.05 |
| Fe | balance |
What surface finishes work on E80C-B8?
Grind or blast to remove slag/oxide; not corrosion resistant at ambient — apply high-temperature aluminium/silicone paint or leave under insulation with a suitable coating.
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 E80C-B8 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- AWS E80C-B8AWS E55C-B8
How much does E80C-B8 cost?
E80C-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.
E80C-B8 — frequently asked
What is E80C-B8 used for?
E80C-B8 is typically used for 9Cr-1Mo boiler tubing, power plant superheater piping, refinery high-temperature vessels and hydrocracker units. In short: 9Cr high-temperature creep strength; PWHT-mandatory deposit; boiler and superheater filler.
What is the yield strength of E80C-B8?
E80C-B8 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 E80C-B8 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 73% of steel grades). Machine only after PWHT (~200 HB); as-welded martensite at ~40 HRC needs carbide tooling, low speed and rigid setups.
Can E80C-B8 be welded?
With care — weldability is rated fair (50/100). Preheat 200–300 °C, interpass ≤ 350 °C, cool to 80–150 °C before a mandatory 730–760 °C / 1 h per 25 mm PWHT; use 75–80 %Ar/CO₂ or CO₂ per the classification and keep the wire dry.
What surface finishes work on E80C-B8?
Grind or blast to remove slag/oxide; not corrosion resistant at ambient — apply high-temperature aluminium/silicone paint or leave under insulation with a suitable coating.
Can E80C-B8 be formed, bent or molded?
Deposited metal is not intended for cold forming; any bending of welded assemblies should be done after PWHT with generous radii.
What is the maximum service temperature of E80C-B8?
E80C-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 E80C-B8 PWHT and E80C-B8-AW?
PWHT is the default condition — standard delivered/qualified condition: tempered martensite meeting AWS A5.29 E80C-B8 mechanical requirements; use for all pressure-part service. AW: condition immediately after welding — hard, low-toughness martensite; only acceptable as an intermediate state before mandatory PWHT. Yield strength is 505 MPa in PWHT versus 760 MPa in AW.
How much does E80C-B8 cost?
E80C-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 A5.29/A5.29M — Low-Alloy Steel Electrodes for Flux Cored Arc Welding — AWS (2010)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe (Grade P9) — ASTM (2023)
- ASME BPVC Section II Part D — Material Properties — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- 9Cr-1Mo cored welding wire datasheets (Böhler, ESAB, Kobelco) — various (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.