Steel A570
ASTM A570
A570 is a hot-rolled carbon steel sheet and strip specification for structural quality material in grades 30, 33, 36, 40, 45 and 50 (ksi minimum yield), also stocked pickled and oiled as HR-PO.
Reference datasheet — A570 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 GR36 condition
A570 tempers and conditions
A570 is supplied in 7 conditions, soft to hard. GR36 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Grade 30 | Softest, most formable A570 grade — pick for parts needing tight bends or deeper stamping. | 240 | 365 | 27 | 105 HB | — |
Grade 33 | Slight strength step up from Gr30 while keeping good bendability. | 265 | 385 | 24 | 112 HB | — |
GR36Default Grade 36 | The default stocked grade — A36-equivalent strength in sheet/strip thickness for general brackets, frames and stampings. | 285 | 400 | 22 | 120 HB | — |
Hot rolled, pickled and oiled | Descaled surface for direct painting, e-coating or close-tolerance forming without mill scale pickup on dies. | 285 | 400 | 23 | 118 HB | 10.8 % IACS |
Grade 40 | Higher-Mn grade for moderately loaded roll-formed sections where weight saving matters. | 310 | 420 | 20 | 130 HB | — |
Grade 45 | Use where section thickness must be reduced; expect larger bend radii and more springback. | 345 | 455 | 18 | 140 HB | — |
Grade 50 | Strongest A570 grade for light high-strength stampings and tube stock; lowest ductility of the family. | 380 | 490 | 16 | 150 HB | — |
What is A570?
A570 is a hot-rolled carbon steel sheet and strip specification for structural quality material in grades 30, 33, 36, 40, 45 and 50 (ksi minimum yield), also stocked pickled and oiled as HR-PO. Engineers use it for light structural members and mechanical stampings where the default 285 MPa yield, 400 MPa tensile and 22 % elongation are sufficient; forms are coil, sheet and strip. Weldability is good (score 92) but it is structural, not drawing, quality, so deep-drawn shapes and very tight radii are outside its range and it has no inherent corrosion resistance. The nearest alternative is A1011 SS/HSLAS sheet. A570 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). A570 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 89% of steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
What is A570 used for?
- light structural parts
- automotive frames
- stamped brackets
Advantages
- Conducts heat well — 51.9 W/m·K (30 BTU/hr·ft·°F), better than 96% of steel grades
- High electrical conductivity — 10.8 % IACS, better than 94% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
- Low strength — 285 MPa (41.3 ksi), worse than 89% of steel grades
A570 properties
Typical room-temperature values for A570-GR36; bars are the position among steel grades.
Physical3
A570 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).
Mechanical14
A570 has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 89% of steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A570 is rated for continuous service to 400°C (752 °F). It conducts heat at 51.9 W/m·K (30 BTU/hr·ft·°F), better than 96% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
A570 conducts electricity at 10.8 % IACS, better than 94% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of A570 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
A570's machinability is good (60/100, better than 83% of steel grades); weldability excellent (92/100); formability very good (70/100).
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. A570 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A570
Is A570 easy to machine?
Cuts easily with HSS or carbide at ~60 % of 1212; gummy chips in the low-strength grades — use sharp positive rake and flood coolant, and expect burrs on punched edges.
Can A570 be welded?
Carbon equivalent below ~0.35, so all arc processes (GMAW/SMAW/RSW) run without preheat on thin sheet; use ER70S-6 / E7018 class filler.
Can A570 be formed, bent or molded?
Structural quality, not drawing quality: press-brake and roll-form freely with bend radii of 1–2t for Gr30–36 and 2–3t for Gr45–50; account for springback and mill-scale die wear.
A570 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 max, all grades | ≤ 0.25 | 0.16 |
| Mn0.90 max for Gr30/33/36; 1.35 max for Gr40/45/50 | ≤ 1.35 | 0.7 |
| Pheat analysis | ≤ 0.04 | 0.02 |
| Sheat analysis | ≤ 0.04 | 0.02 |
| Sinot specified in A570; typical mill practice / killed steels | ≤ 0.3 | 0.05 |
| Fe | balance |
What surface finishes work on A570?
Must be protected — pickle or shot blast the scale, then phosphate + paint, e-coat, zinc plate or hot-dip galvanize; no anodizing.
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 A570 cost?
A570 is a budget-cost steel ($), cheaper than about 90% 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.
A570 — frequently asked
What is A570 used for?
A570 is typically used for light structural parts, automotive frames and stamped brackets. In short: structural-quality hot-rolled sheet; six strength grades stocked; not drawing quality.
What is the yield strength of A570?
A570 has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 89% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is A570 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Cuts easily with HSS or carbide at ~60 % of 1212; gummy chips in the low-strength grades — use sharp positive rake and flood coolant, and expect burrs on punched edges.
Can A570 be welded?
Yes — weldability is rated excellent (92/100). Carbon equivalent below ~0.35, so all arc processes (GMAW/SMAW/RSW) run without preheat on thin sheet; use ER70S-6 / E7018 class filler.
What surface finishes work on A570?
Must be protected — pickle or shot blast the scale, then phosphate + paint, e-coat, zinc plate or hot-dip galvanize; no anodizing.
Can A570 be formed, bent or molded?
Structural quality, not drawing quality: press-brake and roll-form freely with bend radii of 1–2t for Gr30–36 and 2–3t for Gr45–50; account for springback and mill-scale die wear.
What is the maximum service temperature of A570?
A570 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 A570-GR36 and A570-Gr50?
GR36 is the default condition — the default stocked grade — A36-equivalent strength in sheet/strip thickness for general brackets, frames and stampings. Gr50: strongest A570 grade for light high-strength stampings and tube stock; lowest ductility of the family. Yield strength is 285 MPa in GR36 versus 380 MPa in Gr50.
How much does A570 cost?
A570 is a budget-cost steel ($), cheaper than about 90% 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
- ASTM A570/A570M Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality (withdrawn, replaced by A1011) — ASTM International (1998)
- ASTM A1011/A1011M Steel Sheet and Strip, Hot-Rolled, Carbon, Structural, HSLA — ASTM International (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Machinery's Handbook, 31st ed. — Industrial Press (2020)
- worldsteel LCI data for hot rolled coil — World Steel Association (2023)
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.