Steel E80C-B6
E80C-B6 is a 5Cr-0.5Mo composite metal-cored electrode in the low-alloy flux-cored filler family, alloyed with chromium and molybdenum for creep strength and oxidation resistance.
Reference datasheet — E80C-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 PWHT-745 condition
E80C-B6 tempers and conditions
E80C-B6 is supplied in 4 conditions, soft to hard. PWHT-745 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Thermomechanically controlled processed | Same alloy tested under 75–80 % Ar / balance CO₂ shielding; lower spatter, slightly higher toughness and silicon recovery than the CO₂-shielded version. | 505 | 600 | 23 | 190 HB | 2.9 % IACS |
PWHT-745Default PWHT | Standard delivered/qualified condition — use for all pressure-boundary 5Cr-0.5Mo joints; restores ductility and toughness of the martensitic weld metal. | 510 | 600 | 22 | 195 HB | — |
PWHT 730–760 °C | Field/shop PWHT window used on ASTM A335 P5 and A387 Gr.5 joints; slightly softer and tougher than the 745 °C classification test. | 520 | 620 | 21 | 16 HRC | 2.9 % IACS |
As-welded deposit | Only for non-code, non-pressure or temporary work — weld metal is untempered martensite with high hardness, very low toughness and cold-cracking risk. | 680 | 850 | 12 | 38 HRC | 2.8 % IACS |
What is E80C-B6?
E80C-B6 is a 5Cr-0.5Mo composite metal-cored electrode in the low-alloy flux-cored filler family, alloyed with chromium and molybdenum for creep strength and oxidation resistance. It is used to weld 5Cr-0.5Mo piping, furnace tubes and hot-wall process equipment in service to 600 °C, with typical deposit values of 510 MPa yield, 600 MPa tensile, 22 % elongation and about 195 HB (92 HRB). Preheat at 200–300 °C and PWHT at 730–760 °C are mandatory, machinability is limited (score 40) and ambient corrosion resistance is low (score 25), so painting or insulation is required. Use E80C-B8 where 9Cr-1Mo base metal is specified. E80C-B6 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). E80C-B6 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 65% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is E80C-B6 used for?
- 5Cr-0.5Mo piping
- Refinery furnace tubes
- High-temperature process equipment
- Hydroprocessing units
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Good corrosion resistance — 25/100, better than 92% of steel grades
Limitations
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Poor heat conductor — 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
E80C-B6 properties
Typical room-temperature values for E80C-B6-PWHT-745; bars are the position among steel grades.
Physical3
E80C-B6 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).
Mechanical14
E80C-B6 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 65% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
E80C-B6 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical2
E80C-B6 has an electrical resistivity of 6×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is poor (25/100), better than 92% of steel grades.
Sustainability4
Producing a kilogram of E80C-B6 takes about 33 MJ of energy and emits 2.6 kg of CO₂ — more than 76% of steel grades. Typical recycled content is 25%.
Manufacturability6
E80C-B6's machinability is fair (40/100, worse than 77% of steel grades); weldability 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. E80C-B6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E80C-B6
Is E80C-B6 easy to machine?
Machine only after PWHT; as-welded deposit at 35–45 HRC needs carbide or CBN tooling and rigid setups.
Can E80C-B6 be welded?
GMAW/FCAW with Ar-CO₂ or CO₂ shielding; preheat 200–300 °C, interpass ≤ 350 °C, slow cool and PWHT 730–760 °C within a few hours to avoid hydrogen cracking.
Can E80C-B6 be formed, bent or molded?
Not a wrought product — deposit is applied as weld beads; keep heat input moderate (≈ 0.8–2.0 kJ/mm) to limit coarse martensite.
E80C-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 |
|---|---|---|
| Cdeposited weld metal, AWS A5.29 | 0.05 – 0.12 | 0.08 |
| Mn | ≤ 1.25 | 0.6 |
| Si | ≤ 0.8 | 0.4 |
| Cr | 4 – 6 | 5 |
| Mo | 0.45 – 0.65 | 0.55 |
| Ni | ≤ 0.4 | 0.1 |
| Vresidual limit | ≤ 0.05 | 0.02 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Curesidual limit | ≤ 0.35 | 0.05 |
| Fe | balance |
What surface finishes work on E80C-B6?
Grind or blast weld surfaces and apply high-temperature aluminum silicone paint or aluminized coating; the 5Cr deposit is not corrosion-resistant at ambient conditions.
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-B6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- AWS E80C-B6AWS E55C-B6
How much does E80C-B6 cost?
E80C-B6 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-B6 — frequently asked
What is E80C-B6 used for?
E80C-B6 is typically used for 5Cr-0.5Mo piping, refinery furnace tubes, high-temperature process equipment and hydroprocessing units. In short: 5Cr creep-resistant deposit; mandatory 730–760 °C PWHT; matches P5 piping.
What is the yield strength of E80C-B6?
E80C-B6 has a typical yield strength of 510 MPa (74 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 65% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is E80C-B6 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Machine only after PWHT; as-welded deposit at 35–45 HRC needs carbide or CBN tooling and rigid setups.
Can E80C-B6 be welded?
With care — weldability is rated fair (45/100). GMAW/FCAW with Ar-CO₂ or CO₂ shielding; preheat 200–300 °C, interpass ≤ 350 °C, slow cool and PWHT 730–760 °C within a few hours to avoid hydrogen cracking.
What surface finishes work on E80C-B6?
Grind or blast weld surfaces and apply high-temperature aluminum silicone paint or aluminized coating; the 5Cr deposit is not corrosion-resistant at ambient conditions.
Can E80C-B6 be formed, bent or molded?
Not a wrought product — deposit is applied as weld beads; keep heat input moderate (≈ 0.8–2.0 kJ/mm) to limit coarse martensite.
What is the maximum service temperature of E80C-B6?
E80C-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 E80C-B6 PWHT-745 and E80C-B6-AW?
PWHT-745 is the default condition — standard delivered/qualified condition — use for all pressure-boundary 5Cr-0.5Mo joints; restores ductility and toughness of the martensitic weld metal. AW: only for non-code, non-pressure or temporary work — weld metal is untempered martensite with high hardness, very low toughness and cold-cracking risk. Yield strength is 510 MPa in PWHT-745 versus 680 MPa in AW.
How much does E80C-B6 cost?
E80C-B6 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 — American Welding Society (2010)
- ASME BPVC Section II Part C — Welding Rods, Electrodes and Filler Metals (SFA-5.29) — ASME (2023)
- ASME BPVC Section II Part D — Properties (5Cr-0.5Mo materials) — 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 (Cr-Mo steel welding) — ASM International (1993)
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.