Steel E70C-Ni2 AW-M
Finish state
UNS W22030
AW-M = as-welded, 75–80 % Ar / balance CO₂ shielding
Pick when mixed-gas shielding is used — slightly higher strength and the best low-temperature toughness with low spatter.
Values for the AW-M condition
Other E70C-Ni2 tempers and conditions
E70C-Ni2 is listed in 4 conditions; see the grade overview at E70C-Ni2.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Post-weld heat treated | Pick when the fabrication code requires stress relief: strength drops slightly, ductility and dimensional stability improve. | 430 | 520 | 29 | 160 HB | 8.8 % IACS |
As-welded, 100 % CO₂ shielding | Pick for lower gas cost and deeper penetration; slightly lower deposit toughness and more spatter than mixed gas. | 460 | 550 | 26 | 172 HB | 8.5 % IACS |
AWDefault As-welded deposit | Default condition: properties of the deposit straight off the arc, no post-weld heat treatment. | 470 | 560 | 27 | 175 HB | 8.6 % IACS |
AW-MThis page As-welded, 75–80 % Ar / balance CO₂ shielding | Pick when mixed-gas shielding is used — slightly higher strength and the best low-temperature toughness with low spatter. | 480 | 570 | 28 | 178 HB | 8.6 % IACS |
What is E70C-Ni2 AW-M?
E70C-Ni2 AW-M is E70C-Ni2 supplied in the AW-M condition — pick when mixed-gas shielding is used — slightly higher strength and the best low-temperature toughness with low spatter. E70C-Ni2 AW-M has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 59% of steel grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi). E70C-Ni2 AW-M has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). AW is the default condition FabDigit quotes; AW-M is available on request or by drawing note.
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- Tough — resists crack growth — 115 MPa·√m (104.7 ksi·√in), better than 77% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
E70C-Ni2 AW-M properties
Typical room-temperature values for E70C-Ni2 AW-M; 22 are specific to this condition. Other listed values are E70C-Ni2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E70C-Ni2 AW-M has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
E70C-Ni2 AW-M has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 59% of steel grades. Elongation at break is 28% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
E70C-Ni2 AW-M is rated for continuous service to 400°C (752 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
E70C-Ni2 AW-M conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of E70C-Ni2 AW-M takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
E70C-Ni2 AW-M's machinability is good (55/100, better than 62% of steel grades); weldability excellent (92/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E70C-Ni2 AW-M
Is E70C-Ni2 easy to machine?
Weld deposit machines/grinds like normalized low-alloy steel (~60 % of AISI 1212); use carbide tooling and expect variable hardness across bead and HAZ.
Can E70C-Ni2 be welded?
Run DCEP with 75–80 % Ar/CO₂ (M) or CO₂ (C), keep interpass ≤150–250 °C and heat input moderate to protect low-temperature toughness; keep wire dry to avoid hydrogen cracking.
Can E70C-Ni2 be formed, bent or molded?
Not a wrought product — supplied as drawn seamed/seamless cored wire on spools; no forming operations on the deposit beyond weld-cap dressing.
What surface finishes work on E70C-Ni2?
Bare ferrous deposit rusts quickly; blast, prime and paint or metallize the weldment, and dress caps for fatigue-critical joints.
E70C-Ni2 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 |
|---|---|---|
| Cweld metal analysis per AWS A5.29 | ≤ 0.12 | 0.06 |
| Mn | ≤ 1.5 | 1.1 |
| Si | ≤ 0.8 | 0.45 |
| Nisource of low-temperature toughness | 1.75 – 2.75 | 2.2 |
| Cr | ≤ 0.15 | 0.03 |
| Mo | ≤ 0.35 | 0.02 |
| V | ≤ 0.05 | 0.01 |
| Cuincludes any copper coating | ≤ 0.35 | 0.05 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Fe | balance | — |
E70C-Ni2 AW-M — frequently asked
What is E70C-Ni2 AW-M used for?
E70C-Ni2 AW-M is typically used for low-temperature storage tanks, offshore structural steel, arctic pipeline construction and LNG-adjacent structural steel. In short: 2 % Ni toughness filler; good low-temperature notch toughness; cored wire for C-Mn steels.
What is the yield strength of E70C-Ni2 AW-M?
E70C-Ni2 AW-M has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is E70C-Ni2 AW-M easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Weld deposit machines/grinds like normalized low-alloy steel (~60 % of AISI 1212); use carbide tooling and expect variable hardness across bead and HAZ.
Can E70C-Ni2 AW-M be welded?
Yes — weldability is rated excellent (92/100). Run DCEP with 75–80 % Ar/CO₂ (M) or CO₂ (C), keep interpass ≤150–250 °C and heat input moderate to protect low-temperature toughness; keep wire dry to avoid hydrogen cracking.
What surface finishes work on E70C-Ni2 AW-M?
Bare ferrous deposit rusts quickly; blast, prime and paint or metallize the weldment, and dress caps for fatigue-critical joints.
Can E70C-Ni2 AW-M be formed, bent or molded?
Not a wrought product — supplied as drawn seamed/seamless cored wire on spools; no forming operations on the deposit beyond weld-cap dressing.
What is the maximum service temperature of E70C-Ni2 AW-M?
E70C-Ni2 AW-M 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 E70C-Ni2-AW and E70C-Ni2 PWHT?
AW is the default condition — default condition: properties of the deposit straight off the arc, no post-weld heat treatment. PWHT: pick when the fabrication code requires stress relief: strength drops slightly, ductility and dimensional stability improve. Yield strength is 470 MPa in AW versus 430 MPa in PWHT.
Sources
- AWS A5.29/A5.29M — Low-Alloy Steel Electrodes for Flux Cored Arc Welding — American Welding Society (2010)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Metal-cored / flux-cored 2 %Ni wire consumable datasheets — Lincoln Electric / ESAB / Kobelco (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.