Steel A656-Gr80
Grade
ASTM A656
Gr80 = grade 80
The workhorse A656 grade for dump bodies, crane booms and trailer structures.
Values for the Gr80 condition
Other A656 tempers and conditions
A656 is listed in 9 conditions; see the grade overview at A656.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Grade 50 | Lowest strength level — pick when formability and weldability outrank weight saving. | 380 | 450 | 24 | 140 HB | — |
Grade 60 | Mid-level HSLA plate for lightly loaded formed structures. | 450 | 520 | 21 | 160 HB | — |
Grade 70 | Step below the popular Gr 80 when a little more bend ductility is needed. | 520 | 590 | 18 | 12 HRC | 9 % IACS |
titanium microalloyed chemistry | Ti-bearing variant with finer grain and slightly better low-temperature notch toughness at the same strength level. | 575 | 650 | 17 | 17 HRC | 9 % IACS |
HRDefault Hot rolled | Standard mill condition for A656 plate — pick for welded structural weight-saving parts up to ~25 mm. | 580 | 660 | 16 | 215 HB | — |
Gr80This page Grade 80 | The workhorse A656 grade for dump bodies, crane booms and trailer structures. | 580 | 660 | 16 | 18 HRC | 9 % IACS |
vanadium microalloyed chemistry | Default chemistry type supplied by most mills; V precipitation strengthening, good weldability. | 580 | 660 | 16 | 18 HRC | 9 % IACS |
Cold rolled | Thin-gauge cold-reduced product for stamped high-strength panels; better surface and tighter gauge, lower ductility than hot-rolled. | 620 | 700 | 12 | 21 HRC | 9 % IACS |
Grade 100 | Highest A656 strength level for maximum payload / minimum plate thickness; tightest forming and welding control. | 720 | 800 | 14 | 25 HRC | — |
What is A656-Gr80?
A656-Gr80 is A656 in the Gr80 grade — the workhorse A656 grade for dump bodies, crane booms and trailer structures. A656-Gr80 has a yield strength of 580 MPa (84.1 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 75% of steel grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi). A656-Gr80 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). HR is the default condition FabDigit quotes; Gr80 is available on request or by drawing note.
Advantages
- Forms and bends easily — 65/100, better than 81% of steel grades
- Readily welded — 75/100, better than 76% of steel grades
- High strength — 580 MPa (84.1 ksi), better than 75% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
A656-Gr80 properties
Typical room-temperature values for A656-Gr80; 23 are specific to this condition. Other listed values are A656 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A656-Gr80 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical17
A656-Gr80 has a yield strength of 580 MPa (84.1 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 75% of steel grades. Elongation at break is 16% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A656-Gr80 is rated for continuous service to 350°C (662 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), better than 71% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
A656-Gr80 conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of A656-Gr80 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
A656-Gr80's machinability is fair (50/100, worse than 53% of steel grades); weldability very good (75/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A656-Gr80
Is A656 easy to machine?
Machines like a 200–250 HB low-alloy steel — rigid setups, coated carbide, moderate speeds; drilling and plasma/laser cutting are routine but expect edge hardening on thermally cut faces.
Can A656 be welded?
Good weldability at CE < 0.45 — use low-hydrogen (E70xx–E80xx / matching flux-cored) consumables, control heat input and preheat 100–150 °C for Gr 80/100 or thicknesses over ~20 mm.
Can A656 be formed, bent or molded?
Designed for cold bending: bend transverse to rolling direction, use generous radii (≈3–4t for Gr 80, 4–5t for Gr 100) and allow for high springback.
What surface finishes work on A656?
No inherent corrosion resistance — shot blast to SA 2.5 then zinc-rich primer/paint, hot-dip galvanize, or metallize; not anodizable.
A656 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 |
|---|---|---|
| Cheat analysis maximum | ≤ 0.18 | 0.1 |
| Mn | ≤ 1.65 | 1.4 |
| Si | ≤ 0.6 | 0.3 |
| P | ≤ 0.03 | 0.01 |
| Slower S usual for Gr 80/100 with improved formability | ≤ 0.04 | 0.01 |
| VType 3 (vanadium) chemistry | 0.05 – 0.15 | 0.08 |
| TiType 7 (titanium) chemistry | ≤ 0.1 | 0.03 |
| Nboptional microalloy addition | ≤ 0.1 | |
| Alfine-grain practice / deoxidation | ≥ 0.02 | 0.03 |
| N | ≤ 0.02 | 0.01 |
| Fe | balance |
A656-Gr80 — frequently asked
What is A656-Gr80 used for?
A656-Gr80 is typically used for crane booms, truck and trailer frames, dump truck bodies, hoppers and material-handling chutes, agricultural machinery structures and lifting and support beams. In short: high-strength low-alloy structural.
What is the yield strength of A656-Gr80?
A656-Gr80 has a typical yield strength of 580 MPa (84.1 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 75% of steel grades. Strength varies by condition: see the 9 listed tempers.
Is A656-Gr80 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machines like a 200–250 HB low-alloy steel — rigid setups, coated carbide, moderate speeds; drilling and plasma/laser cutting are routine but expect edge hardening on thermally cut faces.
Can A656-Gr80 be welded?
Yes — weldability is rated very good (75/100). Good weldability at CE < 0.45 — use low-hydrogen (E70xx–E80xx / matching flux-cored) consumables, control heat input and preheat 100–150 °C for Gr 80/100 or thicknesses over ~20 mm.
What surface finishes work on A656-Gr80?
No inherent corrosion resistance — shot blast to SA 2.5 then zinc-rich primer/paint, hot-dip galvanize, or metallize; not anodizable.
Can A656-Gr80 be formed, bent or molded?
Designed for cold bending: bend transverse to rolling direction, use generous radii (≈3–4t for Gr 80, 4–5t for Gr 100) and allow for high springback.
What is the maximum service temperature of A656-Gr80?
A656-Gr80 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A656-HR and A656-Gr50?
HR is the default condition — standard mill condition for A656 plate — pick for welded structural weight-saving parts up to ~25 mm. Gr50: lowest strength level — pick when formability and weldability outrank weight saving. Yield strength is 580 MPa in HR versus 380 MPa in Gr50.
Can FabDigit make parts in A656-Gr80?
Yes — A656-Gr80 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A656/A656M — Hot-Rolled Structural Steel, HSLA Plate with Improved Formability — ASTM International (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- HSLA structural plate (A656 Gr 80) product data — Nucor / SSAB service-center literature (2023)
- GB/T 16270 (comparison grades Q550/Q690) — SAC (2009)
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.