Steel E70T-1 PWHT
Heat-treated state
PWHT = post-weld heat treated
Use when the fabrication is code-required to be stress relieved; strength drops, ductility and toughness improve.
Values for the PWHT condition
Other E70T-1 tempers and conditions
E70T-1 is listed in 2 conditions; see the grade overview at E70T-1.
- PWHT
- AW-M
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PWHTThis page Post-weld heat treated | Use when the fabrication is code-required to be stress relieved; strength drops, ductility and toughness improve. | 440 | 540 | 30 | 165 HB | 10 % IACS |
As Welded | Choose mixed gas for lower spatter, slightly higher strength and better low-temperature toughness. | 515 | 600 | 27 | 11 HRC | 10 % IACS |
What is E70T-1 PWHT?
E70T-1 PWHT is E70T-1 heat treated to PWHT — use when the fabrication is code-required to be stress relieved; strength drops, ductility and toughness improve. E70T-1 PWHT has a yield strength of 440 MPa (63.8 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 50% of steel grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi). E70T-1 PWHT 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).
Advantages
- Readily welded — 95/100, better than 97% of steel grades
- Ductile — tolerates forming and impact — 30%, better than 93% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
E70T-1 PWHT properties
Typical room-temperature values for E70T-1 PWHT; 22 are specific to this condition. Other listed values are E70T-1 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E70T-1 PWHT 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
E70T-1 PWHT has a yield strength of 440 MPa (63.8 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 50% of steel grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
E70T-1 PWHT is rated for continuous service to 425°C (797 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
E70T-1 PWHT conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of E70T-1 PWHT takes about 35 MJ of energy and emits 2.4 kg of CO₂ — more than 87% of steel grades. Typical recycled content is 30%.
Manufacturability4
E70T-1 PWHT's machinability is good (62/100, better than 89% of steel grades); weldability excellent (95/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E70T-1 PWHT
Is E70T-1 easy to machine?
As-deposited weld metal machines like normalized 1020–1030 steel; remove slag and grind the crown first to avoid chipping carbide on residual oxide.
Can E70T-1 be welded?
DCEP, flat/horizontal only; 20–25 L/min CO₂ or Ar-CO₂, 15–25 mm stickout, keep wire in sealed packaging or re-bake to prevent moisture-induced porosity.
Can E70T-1 be formed, bent or molded?
Supplied as drawn tubular wire on 15 kg spools; do not kink or crush the sheath — deformed wire causes feeding faults and arc instability.
What surface finishes work on E70T-1?
Self-releasing rutile slag chips off easily; weld surface must be painted, metallized or galvanized for outdoor service since the deposit has no corrosion resistance.
E70T-1 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 A5.20 deposit limit; typical deposit much lower | ≤ 0.18 | 0.05 |
| Mn | ≤ 1.75 | 1.35 |
| Si | ≤ 0.9 | 0.55 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| Niresidual limit | ≤ 0.5 | 0.02 |
| Crresidual limit | ≤ 0.2 | 0.03 |
| Moresidual limit | ≤ 0.3 | 0.01 |
| Vresidual limit | ≤ 0.08 | 0.01 |
| Fe | balance | — |
E70T-1 PWHT — frequently asked
What is E70T-1 PWHT used for?
E70T-1 PWHT is typically used for heavy plate fabrication, shipbuilding, structural steel and high-productivity welding. In short: high-deposition gas-shielded FCAW; flat and horizontal only; easy rutile slag release.
What is the yield strength of E70T-1 PWHT?
E70T-1 PWHT has a typical yield strength of 440 MPa (63.8 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 50% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is E70T-1 PWHT easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). As-deposited weld metal machines like normalized 1020–1030 steel; remove slag and grind the crown first to avoid chipping carbide on residual oxide.
Can E70T-1 PWHT be welded?
Yes — weldability is rated excellent (95/100). DCEP, flat/horizontal only; 20–25 L/min CO₂ or Ar-CO₂, 15–25 mm stickout, keep wire in sealed packaging or re-bake to prevent moisture-induced porosity.
What surface finishes work on E70T-1 PWHT?
Self-releasing rutile slag chips off easily; weld surface must be painted, metallized or galvanized for outdoor service since the deposit has no corrosion resistance.
Can E70T-1 PWHT be formed, bent or molded?
Supplied as drawn tubular wire on 15 kg spools; do not kink or crush the sheath — deformed wire causes feeding faults and arc instability.
What is the maximum service temperature of E70T-1 PWHT?
E70T-1 PWHT is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- AWS A5.20/A5.20M Carbon Steel Electrodes for Flux Cored Arc Welding — American Welding Society (2015)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- Flux-cored wire E70T-1C/1M datasheets — Lincoln Electric / 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.