Steel ER70S-B2L: Properties, Tempers & Uses

ER70S-B2L tempers and conditions

ER70S-B2L is supplied in 3 conditions, soft to hard. AW 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-745 High-temperature temper 730–760 °C	Use when the fabrication receives repeated or extended PWHT (wet H2S / HTHA service) requiring maximum softening and hardness well under 200 HB.	410	520	28	150 HB	8.2 % IACS
PWHT-690 PWHT	Standard condition for ASME code Cr-Mo piping: tempers the weld metal, restores toughness and brings hardness below typical 225 HB / 22 HRC limits.	450	560	26	165 HB	—
AWDefault As-welded deposit	Pick for tack welds, thin-wall or code-exempt joints where PWHT is impractical — the low-carbon B2L chemistry keeps as-welded hardness and cracking risk down.	520	620	22	18 HRC	—

What is ER70S-B2L?

ER70S-B2L (K20500) is a low-carbon 1.25Cr-0.5Mo solid filler wire in the low-alloy steel welding consumable family, used for GTAW and GMAW of P11/P12 chrome-moly piping. The reduced carbon lowers as-welded hardness and underbead cracking risk compared with standard ER70S-B2, while post-weld heat treated deposits typically reach 520 MPa yield, 620 MPa tensile, 22 % elongation and 205 HB (95 HRB, 18 HRC) with service to 450 °C. It is supplied as spooled wire and cut TIG rod. The deposit is not corrosion resistant, and PWHT at 690–730 °C is required for code work; ER80S-B2 is the higher-strength alternative where matching tensile is specified. ER70S-B2L has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F). ER70S-B2L has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 67% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).

What is ER70S-B2L used for?

P11/P12 chrome-moly pipe welding
hydrocracker piping
power generation steam lines
petrochemical process piping

Advantages

High service temperature — 450°C (842 °F), better than 86% of steel grades
Readily welded — 75/100, better than 76% of steel grades

Limitations

High embodied carbon — 2.8 kg CO₂/kg, worse than 90% of steel grades

ER70S-B2L properties

Typical room-temperature values for ER70S-B2L-AW; bars are the position among steel grades.

Physical3

ER70S-B2L has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).

Density7.85 g/cm³0.28 lb/in³

Melting Point (Solidus)1,490°C2,714 °F

Liquidus Temperature1,520°C2,768 °F

Mechanical15

ER70S-B2L has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 67% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).

Elastic (Young's) Modulus205 GPa29.7 Msi

Shear Modulus80 GPa11.6 Msi

Bulk Modulus160 GPa23.2 Msi

Poisson's Ratio0.29

Tensile Strength (Ultimate)620 MPa89.9 ksi

Yield Strength (0.2% offset)520 MPa75.4 ksi

Elongation at Break22%

Reduction in Area60%

Shear Strength400 MPa58 ksi

Fatigue Strength (Endurance Limit)270 MPa39.2 ksi

Charpy V-Notch Impact (RT)80 J59 ft·lbf

Hardness, Brinell205 HB

Hardness, Rockwell B95 HRB

Hardness, Rockwell C18 HRC

Hardness, Vickers215 HV

Thermal6

ER70S-B2L is rated for continuous service to 450°C (842 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).

Thermal Conductivity42 W/m·K24.3 BTU/hr·ft·°F

Specific Heat Capacity460 J/kg·K0.11 BTU/lb·°F

Thermal Expansion (CTE, 20–100 °C)12.3 µm/m·K6.8 µin/in·°F

Latent Heat of Fusion270 J/g116 BTU/lb

Max Service Temperature (continuous)450°C842 °F

Min Service Temperature-30°C-22 °F

Electrical3

ER70S-B2L conducts electricity at 8 % IACS, better than 55% of steel grades.

Electrical Conductivity8 % IACS

Electrical Resistivity2.2×10⁻⁷ Ω·m8.66 µΩ·in

Magnetic Responseferromagnetic

Chemical & Environmental3

Corrosion resistance is poor (18/100), better than 83% of steel grades.

Galvanic Potential (seawater, vs SCE)-0.6 V

Corrosion ResistancePoor18/100

Chemical Resistance SummaryNot corrosion resistant: rusts in moist air and needs coating or insulation; good resistance to high-temperature hydrogen attack and oxidation up to ~550 °C (Nelson-curve service), poor in acids, chlorides and wet H2S without control of weld hardness.

Sustainability4

Producing a kilogram of ER70S-B2L takes about 36 MJ of energy and emits 2.8 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 35%.

Embodied Energy (primary production)36 MJ/kg15,477 BTU/lb

Embodied Carbon (primary production)2.8 kg CO₂/kg

Embodied Water60 L/kg7.2 gal/lb

Typical Recycled Content35%

Manufacturability6

ER70S-B2L's machinability is fair (50/100, worse than 53% of steel grades); weldability very good (75/100); formability fair (45/100).

MachinabilityFair50/100

Machinability Rating (AISI 1212 = 100 %)50%

WeldabilityVery good75/100

Formability (cold)Fair45/100

Brazeability / SolderabilityGood60/100

PolishabilityGood55/100

Common Calculations5

Specific Strength (UTS / density)calculated79 kN·m/kg

Specific Stiffness (E / density)calculated26.1 MN·m/kg

Modulus of Resiliencecalculated660 kJ/m³

Thermal Diffusivitycalculated11.6 mm²/s

Thermal Shock Resistance Indexcalculated10

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. ER70S-B2L is highlighted; hover a dot for its name, or open the interactive family chart.

Working with ER70S-B2L

Is ER70S-B2L easy to machine?

Machine the deposit after PWHT — as-welded bainitic/martensitic weld metal is abrasive on HSS; use carbide at moderate speed with rigid setup.

Can ER70S-B2L be welded?

GTAW/GMAW of P11/P12 with 150–250 °C preheat, ≤300 °C interpass, dry argon shielding, and PWHT at 690–730 °C; the low-carbon grade tolerates short delays before PWHT better than ER70S-B2.

Can ER70S-B2L be formed, bent or molded?

Supplied only as drawn wire or cut rod; no cold forming of the deposit — bend tests should follow PWHT.

ER70S-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
Clow-carbon 'L' grade	≤ 0.05	0.04
Mn	0.4 – 0.7	0.55
Si	0.4 – 0.7	0.55
Cr	1.2 – 1.5	1.35
Mo	0.4 – 0.65	0.52
P	≤ 0.03	0.01
S	≤ 0.03	0.01
Cuincluding any copper coating	≤ 0.35	0.15
Fe	balance

What surface finishes work on ER70S-B2L?

Weld metal rusts readily: grind/blast and prime, or insulate for hot service; no anodizing applicable and plating is rarely used on the joint.

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).

Plating

Organic Coating

Epoxy Coating

Black / Phosphate

Thermal Spray

Plasma Spray

Equivalent designations

Standards and trade names that resolve to Steel ER70S-B2L in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.

UNS: K20500
Other: ER49S-B2L

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Benchmark ER70S-B2L against the top 3 neighbours

How much does ER70S-B2L cost?

ER70S-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.

ER70S-B2L — frequently asked

What is ER70S-B2L used for?

ER70S-B2L is typically used for P11/P12 chrome-moly pipe welding, hydrocracker piping, power generation steam lines and petrochemical process piping. In short: low-carbon Cr-Mo filler; reduced underbead cracking risk; softer as-welded than B2.

What is the yield strength of ER70S-B2L?

ER70S-B2L has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 67% of steel grades. Strength varies by condition: see the 3 listed tempers.

Is ER70S-B2L easy to machine?

Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machine the deposit after PWHT — as-welded bainitic/martensitic weld metal is abrasive on HSS; use carbide at moderate speed with rigid setup.

Can ER70S-B2L be welded?

Yes — weldability is rated very good (75/100). GTAW/GMAW of P11/P12 with 150–250 °C preheat, ≤300 °C interpass, dry argon shielding, and PWHT at 690–730 °C; the low-carbon grade tolerates short delays before PWHT better than ER70S-B2.