Steel E70C-B2L
UNS W52130
E70C-B2L (UNS W52130) is a low-carbon 1.25Cr-0.5Mo composite cored electrode in the AWS low-alloy Cr-Mo filler family, depositing 455 MPa yield and 550 MPa tensile metal with 25 % elongation.
Reference datasheet — E70C-B2L 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-690 condition
E70C-B2L tempers and conditions
E70C-B2L is supplied in 3 conditions, soft to hard. PWHT-690 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 |
|---|---|---|---|---|---|---|
PWHT-LT | Condition after repeated or extended stress-relief cycles typical of heavy vessel fabrication; strength drops toward the specification minimum, so check that design allowables are still met. | 410 | 510 | 28 | 155 HB | 7.9 % IACS |
PWHT-690Default PWHT | Standard supply/qualification condition for code Cr-Mo piping and vessel welds; gives the classified 490 MPa-class properties with low hardness for wet-H₂S or amine service. | 455 | 550 | 25 | 170 HB | — |
As-welded deposit | Use for temporary joints, small non-code repairs or when hardness/strength in the untempered bainitic condition is acceptable; not the AWS classification test condition. | 560 | 660 | 20 | 20 HRC | — |
What is E70C-B2L?
E70C-B2L (UNS W52130) is a low-carbon 1.25Cr-0.5Mo composite cored electrode in the AWS low-alloy Cr-Mo filler family, depositing 455 MPa yield and 550 MPa tensile metal with 25 % elongation. It is used for Cr-Mo alloy piping and pressure vessels in petrochemical and power service, where the reduced carbon lowers as-welded hardness and cracking risk; supplied as spooled cored wire and available in AW and PWHT-690 or PWHT-705LT conditions. Service is limited to about 540 °C, PWHT is normally required for code work, and the deposit has no atmospheric corrosion resistance. E80C-B2 is the standard-carbon option when higher strength is needed. E70C-B2L has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,470°C (2,678 °F). E70C-B2L has a yield strength of 455 MPa (66 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 54% of steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi).
What is E70C-B2L used for?
- 1.25Cr-0.5Mo pipe welding
- Refinery pressure vessels
- Power plant piping
- Petrochemical reactors
Advantages
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Readily welded — 80/100, better than 79% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
E70C-B2L properties
Typical room-temperature values for E70C-B2L-PWHT-690; bars are the position among steel grades.
Physical3
E70C-B2L has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,470°C (2,678 °F).
Mechanical15
E70C-B2L has a yield strength of 455 MPa (66 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 54% of steel grades. Elongation at break is 25% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
E70C-B2L is rated for continuous service to 540°C (1,004 °F). It conducts heat at 41 W/m·K (23.7 BTU/hr·ft·°F), worse than 62% of steel grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
E70C-B2L conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of E70C-B2L takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability6
E70C-B2L's machinability is good (55/100, better than 62% of steel grades); weldability very good (80/100); 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. E70C-B2L is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E70C-B2L
Is E70C-B2L easy to machine?
Machine weld caps after PWHT (~170 HB) with carbide tooling; as-welded bainitic deposits are harder and abrasive on HSS.
Can E70C-B2L be welded?
GMAW/FCAW with Ar-CO₂ (75–80/20–25) or CO₂, DCEP; preheat 150–250 °C, interpass ≤ 300 °C, and PWHT at 675–705 °C for code work — keep hydrogen low and store wire dry.
Can E70C-B2L be formed, bent or molded?
Not a formable product; deposit is applied as weld metal — control bead sequence and heat input to limit distortion and coarse-grain HAZ.
E70C-B2L 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 |
|---|---|---|
| CL = low carbon grade, weld-metal analysis | ≤ 0.05 | 0.04 |
| Mn | ≤ 1.25 | 0.9 |
| Si | ≤ 0.8 | 0.45 |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.4 – 0.65 | 0.52 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Niresidual, some specs limit for Cr-Mo service | ≤ 0.2 | 0.05 |
| Curesidual | ≤ 0.35 | 0.05 |
| Vresidual | ≤ 0.05 | 0.01 |
| Fe | balance |
What surface finishes work on E70C-B2L?
Grind/blast and coat or insulate; the deposit rusts like plain steel at ambient temperature and takes no protective oxide below service temperature.
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 E70C-B2L in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- W52130
- Also called
- AWS E70C-B2LAWS E49C-B2L
How much does E70C-B2L cost?
E70C-B2L 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.
E70C-B2L — frequently asked
What is E70C-B2L used for?
E70C-B2L is typically used for 1.25Cr-0.5Mo pipe welding, refinery pressure vessels, power plant piping and petrochemical reactors. In short: low-carbon Cr-Mo deposit; lower as-welded hardness; code PWHT piping filler.
What is the yield strength of E70C-B2L?
E70C-B2L has a typical yield strength of 455 MPa (66 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 54% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is E70C-B2L easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine weld caps after PWHT (~170 HB) with carbide tooling; as-welded bainitic deposits are harder and abrasive on HSS.
Can E70C-B2L be welded?
Yes — weldability is rated very good (80/100). GMAW/FCAW with Ar-CO₂ (75–80/20–25) or CO₂, DCEP; preheat 150–250 °C, interpass ≤ 300 °C, and PWHT at 675–705 °C for code work — keep hydrogen low and store wire dry.
What surface finishes work on E70C-B2L?
Grind/blast and coat or insulate; the deposit rusts like plain steel at ambient temperature and takes no protective oxide below service temperature.
Can E70C-B2L be formed, bent or molded?
Not a formable product; deposit is applied as weld metal — control bead sequence and heat input to limit distortion and coarse-grain HAZ.
What is the maximum service temperature of E70C-B2L?
E70C-B2L is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between E70C-B2L PWHT-690 and E70C-B2L-AW?
PWHT-690 is the default condition — standard supply/qualification condition for code Cr-Mo piping and vessel welds; gives the classified 490 MPa-class properties with low hardness for wet-H₂S or amine service. AW: use for temporary joints, small non-code repairs or when hardness/strength in the untempered bainitic condition is acceptable; not the AWS classification test condition. Yield strength is 455 MPa in PWHT-690 versus 560 MPa in AW.
How much does E70C-B2L cost?
E70C-B2L 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 A5.29/A5.29M — Low-Alloy Steel Electrodes for Flux Cored Arc Welding — American Welding Society (2010)
- ASME BPVC Section II Part C / Part D (SFA-5.29; 1.25Cr-0.5Mo material properties) — ASME (2023)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Cr-Mo steel weld metals) — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Cr-Mo metal-cored/flux-cored wire datasheets (Lincoln, ESAB, Böhler, Kobelco B2L class) — various producers (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.