Steel A572 Normalized
Heat-treated state
ASTM A572
Specified for heavy plate or low-temperature service to refine grain and restore uniform toughness through thickness.
Values for the Normalized condition
Other A572 tempers and conditions
A572 is listed in 10 conditions; see the grade overview at A572.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
full/subcritical anneal (softened) | Used only to soften for severe forming or machining; the microalloy precipitation strengthening is largely lost. | 290 | 430 | 28 | 125 HB | 9.5 % IACS |
Grade 42 | Lowest strength level, available to 150 mm thickness; pick when thick sections and easy forming matter more than strength. | 310 | 450 | 24 | 130 HB | 47 W/m·K |
HRDefault Hot rolled | Default stock condition: as-rolled A572 Gr.50 plate, beam or channel for welded structures. | 360 | 480 | 22 | 145 HB | 9 % IACS |
NormalizedThis page austenitized and air cooled | Specified for heavy plate or low-temperature service to refine grain and restore uniform toughness through thickness. | 365 | 490 | 24 | 150 HB | 9 % IACS |
Grade 50 | The industry standard HSLA structural grade — best balance of strength, weldability and availability. | 370 | 495 | 21 | 145 HB | 46 W/m·K |
Cold rolled | Thin-gauge cold-reduced HSLA sheet where flatness, tight tolerance and a clean surface matter. | 400 | 500 | 18 | 160 HB | 9 % IACS |
Grade 55 | Intermediate level used where a modest weight saving over Grade 50 is worthwhile; availability is limited. | 405 | 525 | 20 | 155 HB | 46 W/m·K |
Grade 60 | Higher-strength level limited to ~32 mm thickness; used for lighter beams, poles and equipment frames. | 440 | 560 | 18 | 165 HB | 45 W/m·K |
Cold drawn | Cold-drawn round/flat bar: highest strength and best surface finish/straightness, at the cost of ductility and residual stress. | 470 | 560 | 12 | 180 HB | 9 % IACS |
Grade 65 | Highest A572 level (≤32 mm) for maximum weight saving; needs the tightest preheat and forming-radius control. | 475 | 595 | 17 | 180 HB | 45 W/m·K |
What is A572 Normalized?
A572 Normalized is A572 heat treated to Normalized — specified for heavy plate or low-temperature service to refine grain and restore uniform toughness through thickness. A572 Normalized has a yield strength of 365 MPa (52.9 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 71% of steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi). A572 Normalized 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; Normalized is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 140 MPa·√m (127.4 ksi·√in), better than 94% of steel grades
- Readily welded — 85/100, better than 83% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
A572 Normalized properties
Typical room-temperature values for A572 Normalized; 23 are specific to this condition. Other listed values are A572 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A572 Normalized 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).
Mechanical16
A572 Normalized has a yield strength of 365 MPa (52.9 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 71% of steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A572 Normalized is rated for continuous service to 425°C (797 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
A572 Normalized 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 A572 Normalized takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
A572 Normalized's machinability is good (55/100, better than 62% of steel grades); weldability excellent (85/100); formability good (62/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A572 Normalized
Is A572 easy to machine?
Machines like a tough medium-carbon steel — roughly 55% of 1212; use rigid setups, positive-rake carbide and generous coolant, expect stringy chips and some distortion from rolling residual stress.
Can A572 be welded?
Prequalified in AWS D1.1 with E70/ER70S consumables; low carbon equivalent means little preheat below ~20 mm, but limit heat input on Gr.60/65 and use low-hydrogen practice on thick plate.
Can A572 be formed, bent or molded?
Cold bends and press-brakes well with radii ~2–3t (larger than A36 and larger still for Gr.60/65); bend transverse to the rolling direction and avoid re-bending sheared edges.
What surface finishes work on A572?
No natural corrosion protection — shot blast to SA 2.5 then zinc-rich primer, paint, hot-dip galvanize (watch Si for coating thickness) or metallize; not anodizable.
A572 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 |
|---|---|---|
| C0.26 max for Gr.42 shapes/bars per product form | ≤ 0.23 | 0.18 |
| Mn1.65 max for Gr.55–65 plate in some product forms | ≤ 1.35 | 1.15 |
| Si | ≤ 0.4 | 0.25 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Nbcolumbium — Type 1 and Type 3 | 0.01 – 0.05 | 0.03 |
| VType 2 and Type 3 | 0.01 – 0.15 | 0.05 |
| TiType 4/5 options | ≤ 0.05 | |
| NType 5 (V+N) only | ≤ 0.03 | |
| Fe | balance |
A572 Normalized — frequently asked
What is A572 Normalized used for?
A572 Normalized is typically used for bridge girders and gusset plates, building beams and columns, construction equipment frames, crane booms and runway girders, transmission poles and lattice towers and truck and trailer chassis members. In short: standard structural grade.
What is the yield strength of A572 Normalized?
A572 Normalized has a typical yield strength of 365 MPa (52.9 ksi) and a tensile strength of 490 MPa (71.1 ksi) — weaker than 71% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is A572 Normalized easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like a tough medium-carbon steel — roughly 55% of 1212; use rigid setups, positive-rake carbide and generous coolant, expect stringy chips and some distortion from rolling residual stress.
Can A572 Normalized be welded?
Yes — weldability is rated excellent (85/100). Prequalified in AWS D1.1 with E70/ER70S consumables; low carbon equivalent means little preheat below ~20 mm, but limit heat input on Gr.60/65 and use low-hydrogen practice on thick plate.
What surface finishes work on A572 Normalized?
No natural corrosion protection — shot blast to SA 2.5 then zinc-rich primer, paint, hot-dip galvanize (watch Si for coating thickness) or metallize; not anodizable.
Can A572 Normalized be formed, bent or molded?
Cold bends and press-brakes well with radii ~2–3t (larger than A36 and larger still for Gr.60/65); bend transverse to the rolling direction and avoid re-bending sheared edges.
What is the maximum service temperature of A572 Normalized?
A572 Normalized 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 A572-HR and A572-Gr65?
HR is the default condition — default stock condition: as-rolled A572 Gr.50 plate, beam or channel for welded structures. Gr65: highest A572 level (≤32 mm) for maximum weight saving; needs the tightest preheat and forming-radius control. Yield strength is 360 MPa in HR versus 475 MPa in Gr65.
Can FabDigit make parts in A572 Normalized?
Yes — A572 Normalized 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 A572/A572M — High-Strength Low-Alloy Columbium-Vanadium Structural Steel — ASTM International (2021)
- AWS D1.1/D1.1M Structural Welding Code — Steel — American Welding Society (2020)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Construction Manual, 15th ed. — AISC (2017)
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.