Steel E80C-B3L PWHT-730
Heat-treated state
UNS W53130
PWHT-730 = pWHT 730 °C / 1–4 h
Choose when the base metal PWHT is at the upper end or when maximum toughness and lowest residual hardness are required for hydrogen service.
Values for the PWHT-730 condition
Other E80C-B3L tempers and conditions
E80C-B3L is listed in 3 conditions; see the grade overview at E80C-B3L.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHT-730This page PWHT 730 °C / 1–4 h | Choose when the base metal PWHT is at the upper end or when maximum toughness and lowest residual hardness are required for hydrogen service. | 470 | 570 | 27 | 165 HB | — |
PWHT-690Default PWHT 690 °C / 1 h | Standard supply/qualification condition — use for P22 piping and Cr-Mo vessels after the code-required stress relief. | 510 | 610 | 24 | 185 HB | — |
As-welded deposit | Only for thin sections or temporary work — bainitic/martensitic weld metal is hard and hydrogen-crack sensitive. | 680 | 780 | 17 | 26 HRC | — |
What is E80C-B3L PWHT-730?
E80C-B3L PWHT-730 is E80C-B3L heat treated to PWHT-730 — choose when the base metal PWHT is at the upper end or when maximum toughness and lowest residual hardness are required for hydrogen service. E80C-B3L PWHT-730 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 57% of steel grades. Elongation at break is 27% and the elastic modulus is 207 GPa (30 Msi). E80C-B3L PWHT-730 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,450°C (2,642 °F). PWHT-690 is the default condition FabDigit quotes; PWHT-730 is available on request or by drawing note.
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Ductile — tolerates forming and impact — 27%, better than 86% of steel grades
Limitations
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
E80C-B3L PWHT-730 properties
Typical room-temperature values for E80C-B3L PWHT-730; 10 are specific to this condition. Other listed values are E80C-B3L reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E80C-B3L PWHT-730 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
E80C-B3L PWHT-730 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 57% of steel grades. Elongation at break is 27% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
E80C-B3L PWHT-730 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 73% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
E80C-B3L PWHT-730 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of E80C-B3L PWHT-730 takes about 36 MJ of energy and emits 2.6 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 30%.
Manufacturability7
E80C-B3L PWHT-730's machinability is fair (52/100, better than 52% of steel grades); weldability very good (70/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E80C-B3L PWHT-730
Is E80C-B3L easy to machine?
PWHT weld metal machines like normalized-and-tempered 2.25Cr-1Mo; as-welded beads at 260+ HB dull carbide quickly, so machine after stress relief.
Can E80C-B3L be welded?
FCAW/GMAW with 75-80% Ar / balance CO2 (or CO2 for some formulations); preheat and interpass 150–250 °C, low-hydrogen practice, and PWHT at 690–730 °C per ASME code.
Can E80C-B3L be formed, bent or molded?
Not a wrought product — deposit shape is controlled by joint design, stringer beads and controlled heat input (typically 1.0–2.0 kJ/mm).
What surface finishes work on E80C-B3L?
Remove slag/oxide fully between passes; finish with grinding plus aluminized or high-temperature silicone coating, or leave bare inside insulated hot piping.
E80C-B3L 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 |
|---|---|---|
| C'L' = low carbon, reduces hardenability | ≤ 0.05 | 0.03 |
| Mn | ≤ 1.25 | 0.85 |
| Si | ≤ 0.8 | 0.4 |
| Cr | 2 – 2.5 | 2.25 |
| Mo | 0.9 – 1.2 | 1 |
| Nirestricted for elevated-temperature service | ≤ 0.2 | 0.05 |
| Plower P specified for hydrogen/step-cool service | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Vresidual | ≤ 0.05 | 0.01 |
| Curesidual | ≤ 0.35 | 0.05 |
| Fe | balance | — |
E80C-B3L PWHT-730 — frequently asked
What is E80C-B3L PWHT-730 used for?
E80C-B3L PWHT-730 is typically used for 2.25Cr-1Mo reactor vessels, high-temperature hydrogen service piping, power plant headers and refinery process equipment. In short: low-carbon 2.25Cr-1Mo deposit; hydrogen-service Cr-Mo filler; reduced weld hardenability.
What is the yield strength of E80C-B3L PWHT-730?
E80C-B3L PWHT-730 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 57% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is E80C-B3L PWHT-730 easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). PWHT weld metal machines like normalized-and-tempered 2.25Cr-1Mo; as-welded beads at 260+ HB dull carbide quickly, so machine after stress relief.
Can E80C-B3L PWHT-730 be welded?
Yes — weldability is rated very good (70/100). FCAW/GMAW with 75-80% Ar / balance CO2 (or CO2 for some formulations); preheat and interpass 150–250 °C, low-hydrogen practice, and PWHT at 690–730 °C per ASME code.
What surface finishes work on E80C-B3L PWHT-730?
Remove slag/oxide fully between passes; finish with grinding plus aluminized or high-temperature silicone coating, or leave bare inside insulated hot piping.
Can E80C-B3L PWHT-730 be formed, bent or molded?
Not a wrought product — deposit shape is controlled by joint design, stringer beads and controlled heat input (typically 1.0–2.0 kJ/mm).
What is the maximum service temperature of E80C-B3L PWHT-730?
E80C-B3L PWHT-730 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E80C-B3L PWHT-690 and E80C-B3L-AW?
PWHT-690 is the default condition — standard supply/qualification condition — use for P22 piping and Cr-Mo vessels after the code-required stress relief. AW: only for thin sections or temporary work — bainitic/martensitic weld metal is hard and hydrogen-crack sensitive. Yield strength is 510 MPa in PWHT-690 versus 680 MPa in AW.
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 (SFA-5.29) and Part D (2.25Cr-1Mo physical properties) — ASME (2023)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Cr-Mo steels) — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Cr-Mo flux-cored wire datasheets (Kobelco, Lincoln, ESAB, Böhler) — various (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.