Steel A656 Type7
Grade
ASTM A656
Ti-bearing variant with finer grain and slightly better low-temperature notch toughness at the same strength level.
Values for the Type7 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 |
Type7This page 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 | — |
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 Type7?
A656 Type7 is A656 in the Type7 grade — ti-bearing variant with finer grain and slightly better low-temperature notch toughness at the same strength level. A656 Type7 has a yield strength of 575 MPa (83.4 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 75% of steel grades. Elongation at break is 17% and the elastic modulus is 200 GPa (29 Msi). A656 Type7 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; Type7 is available on request or by drawing note.
Advantages
- Forms and bends easily — 68/100, better than 83% of steel grades
- Readily welded — 76/100, better than 77% of steel grades
- High strength — 575 MPa (83.4 ksi), better than 75% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
A656 Type7 properties
Typical room-temperature values for A656 Type7; 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 Type7 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 Type7 has a yield strength of 575 MPa (83.4 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 75% of steel grades. Elongation at break is 17% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A656 Type7 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 Type7 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 Type7 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 Type7's machinability is fair (52/100, better than 52% of steel grades); weldability very good (76/100); formability good (68/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A656 Type7
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 Type7 — frequently asked
What is A656 Type7 used for?
A656 Type7 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 Type7?
A656 Type7 has a typical yield strength of 575 MPa (83.4 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 75% of steel grades. Strength varies by condition: see the 9 listed tempers.
Is A656 Type7 easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% 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 Type7 be welded?
Yes — weldability is rated very good (76/100). 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 Type7?
No inherent corrosion resistance — shot blast to SA 2.5 then zinc-rich primer/paint, hot-dip galvanize, or metallize; not anodizable.
Can A656 Type7 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 Type7?
A656 Type7 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 Type7?
Yes — A656 Type7 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.