Steel E80C-B2 PWHT
Heat-treated state · default condition
UNS W52030
PWHT = post-weld heat treated
The AWS A5.29 classification condition and the normal delivery state for Cr-Mo piping and vessel welds; use whenever code-required PWHT is applied.
Values for the PWHT condition
Other E80C-B2 tempers and conditions
E80C-B2 is listed in 3 conditions; see the grade overview at E80C-B2.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
High-temperature temper 730–760 °C | Pick when heavy-wall vessel codes call for a higher or longer stress relief; softest, toughest condition but with reduced strength. | 460 | 560 | 26 | 9 HRC | 8 % IACS |
PWHTDefaultThis page Post-weld heat treated | The AWS A5.29 classification condition and the normal delivery state for Cr-Mo piping and vessel welds; use whenever code-required PWHT is applied. | 505 | 600 | 23 | 190 HB | — |
As-welded deposit | Only for non-code repairs or interim conditions — strength and hardness are much higher, toughness and hydrogen-crack resistance much lower. | 630 | 740 | 18 | 24 HRC | — |
What is E80C-B2 PWHT?
E80C-B2 PWHT is E80C-B2 heat treated to PWHT — the AWS A5.29 classification condition and the normal delivery state for Cr-Mo piping and vessel welds; use whenever code-required PWHT is applied. E80C-B2 PWHT has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of steel grades. Elongation at break is 23% and the elastic modulus is 205 GPa (29.7 Msi). E80C-B2 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Readily welded — 75/100, better than 76% of steel grades
Limitations
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
E80C-B2 PWHT properties
Typical room-temperature values for E80C-B2 PWHT; 12 are specific to this condition. Other listed values are E80C-B2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E80C-B2 PWHT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical15
E80C-B2 PWHT has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of steel grades. Elongation at break is 23% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
E80C-B2 PWHT is rated for continuous service to 550°C (1,022 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
E80C-B2 PWHT conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of E80C-B2 PWHT takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 25%.
Manufacturability6
E80C-B2 PWHT's machinability is good (55/100, better than 62% of steel grades); weldability very good (75/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E80C-B2 PWHT
Is E80C-B2 easy to machine?
Machine after PWHT (≈190 HB); as-welded bainitic deposits at 250+ HB need carbide tooling and reduced speeds.
Can E80C-B2 be welded?
Gas-shielded (75-80 % Ar/CO₂ or CO₂), DCEP, preheat 150–250 °C, interpass ≤315 °C, PWHT 690 ± 15 °C for 1 h; use low-hydrogen practice and keep spools dry.
Can E80C-B2 be formed, bent or molded?
Not a wrought product — deposit shape is set by joint design; wire feeds well with V-knurled drive rolls and low feed pressure to avoid crushing the core.
What surface finishes work on E80C-B2?
Slag/silicate islands brush off easily; deposit rusts like carbon steel, so shot-blast and apply high-temperature aluminium paint or insulate for service.
E80C-B2 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 |
|---|---|---|
| Cstandard-carbon grade; the 'L' variant is ≤0.05 | 0.05 – 0.12 | 0.08 |
| Mn | ≤ 1.25 | 0.9 |
| Si | ≤ 0.8 | 0.45 |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.4 – 0.65 | 0.5 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance | — |
E80C-B2 PWHT — frequently asked
What is E80C-B2 PWHT used for?
E80C-B2 PWHT is typically used for boiler and pressure vessel welding, refinery high-temperature piping, steam power plant components and petrochemical reactor vessels. In short: 1.25Cr-0.5Mo code filler; 550 °C service deposit; standard-carbon B2 strength.
What is the yield strength of E80C-B2 PWHT?
E80C-B2 PWHT has a typical yield strength of 505 MPa (73.2 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 64% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is E80C-B2 PWHT easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine after PWHT (≈190 HB); as-welded bainitic deposits at 250+ HB need carbide tooling and reduced speeds.
Can E80C-B2 PWHT be welded?
Yes — weldability is rated very good (75/100). Gas-shielded (75-80 % Ar/CO₂ or CO₂), DCEP, preheat 150–250 °C, interpass ≤315 °C, PWHT 690 ± 15 °C for 1 h; use low-hydrogen practice and keep spools dry.
What surface finishes work on E80C-B2 PWHT?
Slag/silicate islands brush off easily; deposit rusts like carbon steel, so shot-blast and apply high-temperature aluminium paint or insulate for service.
Can E80C-B2 PWHT be formed, bent or molded?
Not a wrought product — deposit shape is set by joint design; wire feeds well with V-knurled drive rolls and low feed pressure to avoid crushing the core.
What is the maximum service temperature of E80C-B2 PWHT?
E80C-B2 PWHT 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-B2 PWHT and E80C-B2-AW?
PWHT is the default condition — the AWS A5.29 classification condition and the normal delivery state for Cr-Mo piping and vessel welds; use whenever code-required PWHT is applied. AW: only for non-code repairs or interim conditions — strength and hardness are much higher, toughness and hydrogen-crack resistance much lower. Yield strength is 505 MPa in PWHT versus 630 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) — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Cr-Mo steels) — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Cr-Mo weldments) — ASM International (1993)
- Cr-Mo metal-cored / flux-cored wire weld-metal property sheets — Lincoln Electric / ESAB / Böhler Welding (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.