ASTM A572 Grade 65 Steel Plate Supplier & Stockist
ASC LLP supplies ASTM A572 Grade 65 plate – a high-strength low-alloy (HSLA) structural steel with a minimum yield strength of 65 ksi (450 MPa) and minimum tensile strength of 80 ksi (550 MPa). We stock and export A572 Gr 65 steel plates and sheets for bridges, heavy structures, cranes, trailers and earth-moving equipment, supplied with mill test certificates.
What is ASTM A572 Grade 65 Steel Plate?
ASTM A572 / A572M is the standard specification for high-strength low-alloy columbium (niobium)-vanadium structural steel. It covers five strength grades – 42, 50, 55, 60 and 65 – where the grade number is the minimum yield strength in ksi. Grade 65 is the highest-strength grade in the specification.
Small additions of niobium, vanadium, titanium or nitrogen give A572 steel a fine grain structure, so it achieves high strength with low carbon. The result is a plate that is stronger than plain carbon structural steel such as ASTM A36 (36 ksi yield), while remaining weldable and formable. Using A572 Grade 65 lets designers reduce section thickness and structure weight.
Key Properties of ASTM A572 Grade 65 Plates
- High strength: 65 ksi (450 MPa) minimum yield and 80 ksi (550 MPa) minimum tensile strength – about 80% higher yield than A36.
- Weight saving: the higher strength allows thinner, lighter sections for the same load.
- Weldability: low carbon and micro-alloying give good weldability with standard structural welding practice.
- Formability and machinability: can be cut, bent, drilled and machined with normal shop equipment.
- Toughness: supplementary Charpy V-notch impact testing can be specified where notch toughness matters.
Is ASTM A572-65 Corten (Weathering) Steel?
No. ASTM A572 Grade 65 is often searched for as “A572-65 corten steel”, but A572 is not a weathering steel. It does not contain the copper, chromium and nickel additions that let corten steel form a protective rust patina, so it must be painted, galvanized or otherwise coated for outdoor exposure.
If you need a 65 ksi plate with weathering (atmospheric corrosion) resistance, the correct specification is ASTM A871 Grade 65 plate. Other weathering grades we supply include ASTM A588, ASTM A709 Grade 50W, ASTM A242 and ASTM A606 Type 4. See all Corten steel plates.
| Types | ASTM A572 Grade 65 | ASTM A871 Grade 65 |
| Steel type | HSLA structural steel (Nb-V) | HSLA weathering steel |
| Min. yield / tensile | 65 ksi / 80 ksi | 65 ksi / 80 ksi |
| Atmospheric corrosion resistance | Standard – needs coating | Enhanced – forms protective patina |
| Typical use | Coated structures, equipment, trailers | Unpainted towers, poles, bridges |
ASTM A572 Grade 65 Plate Sizes
| Parameter | Range |
| Thickness | 6 mm – 32 mm (1/4″ – 1-1/4″) |
| Width | 1220 mm – 3050 mm (48″ – 120″) |
| Length | 2440 mm – 12000 mm (96″ – 480″) |
| Supply condition | Hot rolled; cut-to-size, plasma / gas cut shapes on request |
ASTM A572 limits Grade 65 plate to a maximum thickness of 1-1/4″ (32 mm). For heavier plate, Grade 50 (up to 4″) or Grade 42 (up to 6″) is used.
Mechanical Properties of ASTM A572 Grade 65
| Property | Requirement |
| Yield Strength, min | 65 ksi (450 MPa) |
| Tensile Strength, min | 80 ksi (550 MPa) |
| Elongation in 8″ (200 mm), min | 15% |
| Elongation in 2″ (50 mm), min | 17% |
| Charpy V-notch impact | Optional supplementary requirement (S5) – specify temperature and energy |
For plates wider than 24″ (600 mm), the elongation requirement is reduced by 2 percentage points.
Specifications of ASTM A572 Grade 65 Plates
| Specification | Details |
| Standard | ASTM A572 / A572M, ASME SA572 |
| Grade | Grade 65 [450] |
| Steel type | High-strength low-alloy (HSLA) columbium-vanadium structural steel |
| Types | Type 1, 2, 3 or 5 (by micro-alloy – see chemistry below) |
| General requirements | ASTM A6 / A6M (tolerances, testing, marking) |
| Forms | Plate, sheet, flat bar, cut-to-size blanks |
| Test certificate | EN 10204 3.1 mill test certificate; third-party inspection on request |
Chemical Composition of ASTM A572 Grade 65
| Thickness | C max | Mn max | P max | S max | Si max |
| Up to 1/2″ (13 mm) | 0.26 | 1.35 | 0.030 | 0.030 | 0.40 |
| Over 1/2″ to 1-1/4″ (13–32 mm) | 0.23 | 1.65 | 0.030 | 0.030 | 0.40 |
Values in %, heat analysis. P and S limits are those of current editions of ASTM A572 (earlier editions allowed P 0.04 and S 0.05).
Micro-alloying Types
| Type | Alloying elements (%) |
| Type 1 | Niobium (Columbium) 0.005 – 0.05 |
| Type 2 | Vanadium 0.01 – 0.15 |
| Type 3 | Niobium 0.005 – 0.05 + Vanadium 0.01 – 0.15 (combined 0.02 – 0.15) |
| Type 5 | Titanium 0.006 – 0.04, Nitrogen 0.003 – 0.015, Vanadium 0.06 max |
ASTM A572 Grades Compared – Grade 42 to Grade 65
| Grade | Min. Yield | Min. Tensile | Max. Plate Thickness |
| Grade 42 | 42 ksi (290 MPa) | 60 ksi (415 MPa) | 6″ (150 mm) |
| Grade 50 | 50 ksi (345 MPa) | 65 ksi (450 MPa) | 4″ (100 mm) |
| Grade 55 | 55 ksi (380 MPa) | 70 ksi (485 MPa) | 2″ (50 mm) |
| Grade 60 | 60 ksi (415 MPa) | 75 ksi (520 MPa) | 1-1/4″ (32 mm) |
| Grade 65 | 65 ksi (450 MPa) | 80 ksi (550 MPa) | 1-1/4″ (32 mm) |
A572 Grade 50 vs Grade 65: Grade 50 is the most widely used and is available in much thicker plate. Grade 65 offers 30% higher yield strength for weight-critical designs, but only up to 1-1/4″ thick.
Equivalent Grades of ASTM A572 Grade 65
| Standard | Closest Equivalent |
| ASTM / ASME | ASTM A572 Gr 65 / ASME SA572 Gr 65 |
| EN 10025-2 | S450J0 |
| EN 10025-4 (thermomechanical) | S460M / S460ML |
| EN 10025-3 (normalized) | S460N / S460NL |
Equivalents are approximate – chemistry, thickness limits and impact requirements differ between standards, so confirm suitability before substituting.
Physical Properties of A572 Grade 65 Steel
| Property | Value |
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Poisson’s Ratio | 0.3 |
| Thermal Conductivity | 50 W/m·K |
| Thermal Expansion | 11.0 µm/m·K |
Applications of ASTM A572 Grade 65 Plates
| Industry | Typical Use |
| Bridges & infrastructure | Girders, cross-frames, bridge components (coated) |
| Buildings & structures | High-rise columns, beams, trusses and connection plates |
| Transmission & telecom | Towers and poles (galvanized) |
| Transport equipment | Truck frames, trailers, rail cars |
| Heavy equipment | Crane booms, earth-moving and mining equipment, agricultural machinery |
| Energy | Wind-tower components, offshore and oil & gas structures |
Why Buy ASTM A572 Grade 65 Plate from ASC LLP?
ASC LLP has more than 30 years of experience supplying structural and alloy steel to buyers in India and export markets.
- Certified material: plates supplied to ASTM A572 / A6 with EN 10204 3.1 mill test certificates.
- Correct grade selection: we help you choose between A572 Gr 50, Gr 65 and weathering grades such as A871 and A588.
- Cut-to-size service: plates cut to your dimensions to reduce waste and fabrication time.
- Export-ready: seaworthy packing and documentation for worldwide shipment.
Related Structural & Weathering Steel Plates
Frequently Asked Questions – ASTM A572 Grade 65
What is ASTM A572 Grade 65 steel?
ASTM A572 Grade 65 is a high-strength low-alloy (HSLA) columbium-vanadium structural steel with a minimum yield strength of 65 ksi (450 MPa) and minimum tensile strength of 80 ksi (550 MPa). It is the highest-strength grade in the ASTM A572 specification.
Is A572 Grade 65 the same as Corten steel?
No. A572 Grade 65 is not a weathering steel and needs a protective coating outdoors. The weathering (Corten-type) equivalent with 65 ksi yield is ASTM A871 Grade 65.
What is the maximum thickness of A572 Grade 65 plate?
ASTM A572 limits Grade 65 plate to 1-1/4 inches (32 mm). Thicker plates are available in Grade 50 (up to 4 inches) and Grade 42 (up to 6 inches).
What is the difference between A572 Grade 50 and Grade 65?
Grade 65 has a minimum yield of 65 ksi versus 50 ksi for Grade 50, and a minimum tensile of 80 ksi versus 65 ksi. Grade 50 is available in thicker plate and is more widely stocked; Grade 65 is chosen where weight saving matters.
Is ASTM A572 Grade 65 weldable?
Yes. Its low carbon and micro-alloyed chemistry give good weldability using standard structural welding procedures. Preheat may be needed for thicker sections, following AWS D1.1 or the project welding specification.
What is the European equivalent of A572 Grade 65?
The closest European equivalents are S450J0 to EN 10025-2 and S460M / S460N to EN 10025-4 and EN 10025-3. These are approximate matches, so compare chemistry, thickness and impact requirements before substituting.
Global Reach
ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality ASTM A572 Gr65 Plates. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
