Steel E71T-8-SR (Stress relieved)
Heat-treated state
Pick when the fabrication code requires PWHT of thick or restrained joints; strength drops slightly, ductility rises.
Values for the SR condition
Other E71T-8 tempers and conditions
E71T-8 is listed in 4 conditions; see the grade overview at E71T-8.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page 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-SR?
E71T-8-SR is E71T-8 heat treated to SR — pick when the fabrication code requires PWHT of thick or restrained joints; strength drops slightly, ductility rises. E71T-8-SR has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 51% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi). E71T-8-SR 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; SR is available on request or by drawing note.
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- Ductile — tolerates forming and impact — 29%, better than 91% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
- Conducts heat well — 49 W/m·K (28.3 BTU/hr·ft·°F), better than 83% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
E71T-8-SR properties
Typical room-temperature values for E71T-8-SR; 22 are specific to this condition. Other listed values are E71T-8 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E71T-8-SR 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-SR has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 51% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
E71T-8-SR is rated for continuous service to 425°C (797 °F). It conducts heat at 49 W/m·K (28.3 BTU/hr·ft·°F), better than 83% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
E71T-8-SR conducts electricity at 10.5 % IACS, better than 89% 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-SR 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-SR's machinability is good (60/100, better than 83% of steel grades); weldability excellent (92/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E71T-8-SR
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.
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.
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 | — |
E71T-8-SR — frequently asked
What is E71T-8-SR used for?
E71T-8-SR 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-SR?
E71T-8-SR has a typical yield strength of 430 MPa (62.4 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 51% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is E71T-8-SR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% 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-SR 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-SR?
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-SR 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-SR?
E71T-8-SR 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.
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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.