Steel ER70S-2
ER70S-2 is a triple-deoxidized solid mild-steel filler, adding titanium, zirconium and aluminium to the usual Mn and Si.
Reference datasheet — ER70S-2 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 AW-GTAW condition
ER70S-2 tempers and conditions
ER70S-2 is supplied in 4 conditions, soft to hard. AW-GTAW 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 |
|---|---|---|---|---|---|---|
Stress Relieved | Choose for pressure-vessel/pipe deposits requiring PWHT; strength drops a little, ductility and toughness improve. | 390 | 505 | 31 | 140 HB | 11 % IACS |
As Welded | Use for thick-section multipass deposits; higher heat input coarsens the deposit and trims strength slightly. | 410 | 520 | 27 | 148 HB | 10.5 % IACS |
As Welded | Pick when ER70S-2 is used as MIG/MAG wire on rusty or scaled plate; slightly lower deposit ductility with CO₂-rich gas. | 430 | 540 | 26 | 160 HB | 10.5 % IACS |
AW-GTAWDefault As Welded | Standard TIG root-pass / repair condition: cut-length rod welded with pure argon, no post-weld heat treatment. | 450 | 560 | 28 | 155 HB | 10.5 % IACS |
Supply forms, finishes and certifications
Ways ER70S-2 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE-CD | Filler wire | Supply form |
What is ER70S-2?
ER70S-2 is a triple-deoxidized solid mild-steel filler, adding titanium, zirconium and aluminium to the usual Mn and Si. The extra deoxidizers suppress porosity on lightly rusted or mill-scaled steel, which makes it the usual choice for GTAW root passes, pipe work and field repair; typical deposits give 450 MPa yield, 560 MPa tensile, 28 % elongation and about 155 HB, with service to roughly 400 °C. It costs more than ER70S-6 and is stocked mainly as cut TIG rod, so ER70S-6 remains the economical option for production GMAW on prepared joints. ER70S-2 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). ER70S-2 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 52% of steel grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi).
What is ER70S-2 used for?
- TIG root pass welding
- pipe welding
- field repair
- general mild steel joining
Advantages
- Readily welded — 98/100, better than 100% of steel grades
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
ER70S-2 properties
Typical room-temperature values for ER70S-2-AW-GTAW; bars are the position among steel grades.
Physical3
ER70S-2 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).
Mechanical16
ER70S-2 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 52% of steel grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
ER70S-2 is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
ER70S-2 conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of ER70S-2 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
ER70S-2's machinability is good (62/100, better than 89% of steel grades); weldability excellent (98/100); formability very good (70/100).
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. ER70S-2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ER70S-2
Is ER70S-2 easy to machine?
Deposit machines like ordinary low-carbon steel — gummy chips, use sharp tools and positive rake; expect ~65 % of AISI 1212 rate.
Can ER70S-2 be welded?
Designed for GTAW root passes and GMAW on lightly rusted or scaled steel; triple deoxidation (Ti-Zr-Al) suppresses porosity, run pure Ar for TIG or 75Ar/25CO₂ for MIG, preheat only per base-metal thickness.
Can ER70S-2 be formed, bent or molded?
Deposit is ductile and cold-formable (28 % elongation); the shipped wire itself is heavily cold drawn and should not be sharply re-bent.
ER70S-2 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 |
|---|---|---|
| CAWS A5.18 ER70S-2 | ≤ 0.07 | 0.06 |
| Mn | 0.9 – 1.4 | 1.15 |
| Si | 0.4 – 0.7 | 0.55 |
| Tideoxidizer | 0.05 – 0.15 | 0.1 |
| Zrdeoxidizer | 0.02 – 0.12 | 0.07 |
| Aldeoxidizer | 0.05 – 0.15 | 0.1 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.04 | 0.01 |
| Ni | ≤ 0.15 | |
| Cr | ≤ 0.15 | |
| Mo | ≤ 0.15 | |
| V | ≤ 0.03 | |
| Cuincludes copper coating | ≤ 0.5 | 0.2 |
| Fe | balance |
What surface finishes work on ER70S-2?
No corrosion resistance — grind/blend the bead then paint, zinc-plate or galvanize; the copper flash on the wire may leave a faint colour difference in polished welds.
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
How much does ER70S-2 cost?
ER70S-2 is a standard-cost steel ($$), cheaper than about 71% 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-2 — frequently asked
What is ER70S-2 used for?
ER70S-2 is typically used for TIG root pass welding, pipe welding, field repair and general mild steel joining. In short: best TIG root-pass filler; triple-deoxidized for rusty steel; costlier than ER70S-6.
What is the yield strength of ER70S-2?
ER70S-2 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 52% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is ER70S-2 easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Deposit machines like ordinary low-carbon steel — gummy chips, use sharp tools and positive rake; expect ~65 % of AISI 1212 rate.
Can ER70S-2 be welded?
Yes — weldability is rated excellent (98/100). Designed for GTAW root passes and GMAW on lightly rusted or scaled steel; triple deoxidation (Ti-Zr-Al) suppresses porosity, run pure Ar for TIG or 75Ar/25CO₂ for MIG, preheat only per base-metal thickness.
What surface finishes work on ER70S-2?
No corrosion resistance — grind/blend the bead then paint, zinc-plate or galvanize; the copper flash on the wire may leave a faint colour difference in polished welds.
Can ER70S-2 be formed, bent or molded?
Deposit is ductile and cold-formable (28 % elongation); the shipped wire itself is heavily cold drawn and should not be sharply re-bent.
What is the maximum service temperature of ER70S-2?
ER70S-2 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ER70S-2 AW-GTAW and ER70S-2 SR-620?
AW-GTAW is the default condition — standard TIG root-pass / repair condition: cut-length rod welded with pure argon, no post-weld heat treatment. SR-620: choose for pressure-vessel/pipe deposits requiring PWHT; strength drops a little, ductility and toughness improve. Yield strength is 450 MPa in AW-GTAW versus 390 MPa in SR-620.
How much does ER70S-2 cost?
ER70S-2 is a standard-cost steel ($$), cheaper than about 71% 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 A5.18/A5.18M — Carbon Steel Electrodes and Rods for Gas Shielded Arc Welding — AWS (2021)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ER70S-2 GTAW rod weld-metal property sheets (Lincoln Electric / ESAB / ) — 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.