Steel E71T-8
E71T-8 is a self-shielded, all-position flux-cored wire for C-Mn steel with improved low-temperature notch toughness, available in low-hydrogen (H8) and nickel-bearing (Ni1J) variants.
Reference datasheet — E71T-8 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 condition
E71T-8 tempers and conditions
E71T-8 is supplied in 4 conditions, soft to hard. AW 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 | Pick when the fabrication code requires PWHT of thick or restrained joints; strength drops slightly, ductility rises. | 430 | 520 | 29 | 160 HB | 10.5 % IACS |
AWDefault As-welded deposit | Standard condition for AWS A5.20 classification testing and for the great majority of field structural work. | 460 | 550 | 26 | 170 HB | — |
E71T-8-H8 | Order this designator when hydrogen-assisted cracking control is specified for higher-restraint or thicker carbon/low-alloy joints. | 460 | 550 | 26 | 170 HB | 10 % IACS |
E71T8-Ni1J | Use for cold-service structures where 27 J is required at -40 °C rather than -29 °C. | 480 | 570 | 25 | 180 HB | 9 % IACS |
What is E71T-8?
E71T-8 is a self-shielded, all-position flux-cored wire for C-Mn steel with improved low-temperature notch toughness, available in low-hydrogen (H8) and nickel-bearing (Ni1J) variants. Deposits give about 460 MPa yield, 550 MPa tensile, 26 % elongation and 170 HB (88 HRB), with service to 400 °C and a machinability score of 55. It is used for structural field erection and bridge work in cold climates because no shielding gas is needed. Slag must be removed fully between passes, and the bare deposit has no corrosion resistance; where toughness is not required, E71T-11 is simpler to run. E71T-8 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). E71T-8 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 55% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi).
What is E71T-8 used for?
- structural steel in cold climates
- field erection
- bridge construction
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- High electrical conductivity — 10 % IACS, better than 83% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
E71T-8 properties
Typical room-temperature values for E71T-8-AW; bars are the position among steel grades.
Physical3
E71T-8 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).
Mechanical14
E71T-8 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 55% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
E71T-8 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
E71T-8 conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of E71T-8 takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability7
E71T-8's machinability is good (55/100, better than 62% of steel grades); weldability excellent (92/100); formability good (55/100).
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. E71T-8 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E71T-8
Is E71T-8 easy to machine?
Deposit machines like a normalized C-Mn steel (~60 % of AISI 1212); remove slag and any Al-rich oxide skin before cutting to protect tool edges.
Can E71T-8 be welded?
Self-shielded DCEN, all-position, no shielding gas — ideal for windy field work; keep interpass ≤250 °C and stringer/slight-weave technique, and remove slag fully between passes to avoid inclusions.
Can E71T-8 be formed, bent or molded?
Wire is drawn and rolled into a formed strip sheath with mineral flux fill; keep spools dry (re-bake per maker) to hold low diffusible hydrogen.
E71T-8 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 weld-metal limit; typical deposit much lower | ≤ 0.3 | 0.08 |
| Mn | ≤ 1.75 | 0.9 |
| Si | ≤ 0.6 | 0.15 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.03 | 0.01 |
| AlAluminium deoxidiser characteristic of self-shielded T-8 slag system | ≤ 1.8 | 1 |
| Niup to ~1.2 % in the Ni1J variant | ≤ 0.5 | 0.1 |
| Cr | ≤ 0.2 | 0.03 |
| Mo | ≤ 0.3 | 0.02 |
| V | ≤ 0.08 | 0.01 |
| Fe | balance |
What surface finishes work on E71T-8?
Weld beads must be de-slagged and ground before painting; no anodizing — protect with epoxy paint, zinc-rich primer, metallizing or galvanizing.
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 E71T-8 cost?
E71T-8 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.
E71T-8 — frequently asked
What is E71T-8 used for?
E71T-8 is typically used for structural steel in cold climates, field erection and bridge construction. In short: gasless with cold toughness; all-position self-shielded wire; low-hydrogen H8 variants.
What is the yield strength of E71T-8?
E71T-8 has a typical yield strength of 460 MPa (66.7 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 55% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is E71T-8 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Deposit machines like a normalized C-Mn steel (~60 % of AISI 1212); remove slag and any Al-rich oxide skin before cutting to protect tool edges.
Can E71T-8 be welded?
Yes — weldability is rated excellent (92/100). Self-shielded DCEN, all-position, no shielding gas — ideal for windy field work; keep interpass ≤250 °C and stringer/slight-weave technique, and remove slag fully between passes to avoid inclusions.
What surface finishes work on E71T-8?
Weld beads must be de-slagged and ground before painting; no anodizing — protect with epoxy paint, zinc-rich primer, metallizing or galvanizing.
Can E71T-8 be formed, bent or molded?
Wire is drawn and rolled into a formed strip sheath with mineral flux fill; keep spools dry (re-bake per maker) to hold low diffusible hydrogen.
What is the maximum service temperature of E71T-8?
E71T-8 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 E71T-8-AW and E71T-8-SR?
AW is the default condition — standard condition for AWS A5.20 classification testing and for the great majority of field structural work. SR: pick when the fabrication code requires PWHT of thick or restrained joints; strength drops slightly, ductility rises. Yield strength is 460 MPa in AW versus 430 MPa in SR.
How much does E71T-8 cost?
E71T-8 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 A5.20/A5.20M — Specification for Carbon Steel Electrodes for Flux Cored Arc Welding — American Welding Society (2015)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering — ASM International (1993)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Self-shielded flux-cored wire datasheets (Lincoln Electric NR-series, Hobart, / E71T-8) — various producers (2024)
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.