ASTM A871 Grade 65 Type 1 structural steel plate is a high-strength, low-alloy weathering steel with a minimum yield strength of 65 ksi (450 MPa). It is designed for tubular structures, poles and other outdoor load-bearing components requiring both structural strength and atmospheric corrosion resistance.
ASTM A871 Grade 65 Type 1 is also commonly marketed as A871 Grade 65 Corten steel or weathering steel plate. However, COR-TEN is a trademark, while ASTM A871/A871M is the applicable material specification. Its copper, chromium, silicon and other alloying elements help form a dense protective patina during alternating wet and dry exposure.
ASTM A871 Grade 65 Type 1 Specifications
| Item | Specification |
|---|---|
| Material | ASTM A871 Grade 65 Type 1 |
| Standard | ASTM A871/A871M |
| Steel type | High-strength low-alloy weathering steel |
| Minimum yield strength | 65 ksi / 450 MPa |
| Minimum tensile strength | 80 ksi / 550 MPa |
| Minimum elongation | 15% in 8 in. gauge length |
| Typical delivery conditions | As-rolled, normalized or quenched and tempered |
| Surface condition | Mill finish, shot-blasted or pre-weathered |
| Main applications | Transmission poles, lighting poles and tubular structures |
| Available processing | Cutting, bending, rolling, drilling and welding |
The applicable ASTM edition, plate thickness, delivery condition and supplementary test requirements should be stated in the purchase order.
Need ASTM A871 Grade 65 Type 1 steel plate? Send Gnee Steel your required thickness, dimensions, quantity and application for a technical offer.
ASTM A871 Grade 65 Type 1 Chemical Composition
Type 1 identifies a specific chemical composition under ASTM A871. It is not a surface finish or quality level.
| Element | ASTM A871 Grade 65 Type 1 |
|---|---|
| Carbon, C | ≤0.19% |
| Manganese, Mn | 0.80–1.35% |
| Phosphorus, P | ≤0.030% |
| Sulfur, S | ≤0.030% |
| Silicon, Si | 0.30–0.65% |
| Chromium, Cr | 0.40–0.70% |
| Nickel, Ni | ≤0.40% |
| Copper, Cu | 0.25–0.40% |
| Vanadium, V | 0.02–0.10% |
Copper and chromium contribute to atmospheric corrosion resistance, while manganese and vanadium support the required strength. The actual heat analysis should be verified using the mill test certificate supplied with the order.
Mechanical Properties of A871 Grade 65 Type 1 Steel
| Mechanical Property | Requirement |
|---|---|
| Yield strength | ≥65 ksi / 450 MPa |
| Tensile strength | ≥80 ksi / 550 MPa |
| Elongation | ≥15% in 8 in. |
| Density | Approximately 7.85 g/cm³ |
| Weathering performance | Better atmospheric corrosion resistance than ordinary carbon steel |
The 450 MPa minimum yield strength allows designers to use ASTM A871 Grade 65 Type 1 in high-load structural components. Final plate thickness must still be calculated according to structural loads, buckling, fatigue, welding details and applicable design codes.
Charpy V-notch impact testing can be specified when low-temperature toughness is important. Test temperature and absorbed-energy requirements should be included in the purchase specification instead of assumed from the basic grade designation.
Typical A871 Grade 65 Plate Sizes
| Product Parameter | Typical Supply Range |
|---|---|
| Thickness | 3/16–2 in. / approximately 4.8–50.8 mm |
| Width | 48–120 in. / approximately 1,219–3,048 mm |
| Length | Cut to project requirements |
| Edge | Mill edge or cut edge |
| Tolerance | ASTM tolerance or project-specific tolerance |
| Certificate | Mill test certificate available |
These dimensions represent common commercial supply ranges rather than the dimensional limits of ASTM A871. Non-standard widths, lengths and cut components can be supplied according to drawings and mill availability.
Why Use ASTM A871 Grade 65 Type 1 Corten Steel?
The principal advantage of ASTM A871 Grade 65 Type 1 Corten steel is the combination of 450 MPa minimum yield strength and atmospheric corrosion resistance. When correctly detailed and exposed to alternating wet and dry cycles, its surface gradually develops a compact oxide layer that slows further corrosion.
For suitable outdoor structures, A871 Grade 65 weathering steel can reduce the need for periodic repainting. It also provides a natural brown patina for projects where the exposed steel surface forms part of the architectural appearance.
The protective patina does not develop effectively in every environment. Continuous immersion, buried service, persistent dampness, heavy marine chlorides and sheltered areas without drying cycles may require coatings or a different material.
Applications of ASTM A871 Grade 65 Type 1 Plate
ASTM A871 Grade 65 Type 1 structural steel plate is specifically associated with poles, tubular structures and other high-strength outdoor components.
| Application | Why A871 Grade 65 Is Used |
|---|---|
| Transmission poles | 450 MPa yield strength and outdoor durability |
| Lighting poles | Strength combined with reduced coating maintenance |
| Sign-support structures | Suitable for exposed structural components |
| Tubular structures | Developed for formed and welded structural sections |
| Utility structures | Atmospheric corrosion resistance in outdoor service |
| Architectural structures | Natural weathered appearance |
| Industrial supports | High strength for weight-sensitive structural designs |
Using A871 Grade 65 for bridges or other safety-critical structures requires confirmation that the project specification, design code and impact-toughness requirements permit the material.
Planning a pole or tubular structure project? Send us the plate thickness, developed width, pole drawing, welding requirements and project location. We can recommend suitable A871 Grade 65 Type 1 plate and processing.
ASTM A871 Grade 65 Type 1 vs A588 Grade A
| Property | A871 Grade 65 Type 1 | ASTM A588 Grade A |
|---|---|---|
| Minimum yield strength | 450 MPa | 345 MPa for common thicknesses |
| Minimum tensile strength | 550 MPa | 485 MPa |
| Main product focus | Structural plate for poles and tubular structures | General weathering structural plate and shapes |
| Atmospheric corrosion resistance | Yes | Yes |
| Typical selection reason | Higher structural strength | Wider use in general weathering structures |
A871 Grade 65 Type 1 provides a higher specified yield strength than A588 Grade A. However, the grades should not be substituted based on strength alone. Thickness, chemistry, weldability, toughness and project approval must also be reviewed.
Processing ASTM A871 Grade 65 Weathering Steel
Gnee Steel supplies ASTM A871 Grade 65 Type 1 weathering steel plate with CNC cutting, beveling, drilling, bending, rolling, welding, shot blasting and pre-weathering services.
Welding consumables should be selected according to the required joint strength and weathering performance. For visible unpainted welds, compatible weathering-steel consumables may be required so that the weld area develops a similar appearance and corrosion resistance.
Each batch can be supplied with an EN 10204 3.1 or 3.2 inspection certificate. Ultrasonic testing, chemical analysis, tensile testing, impact testing and third-party inspection by SGS, BV or TÜV can also be arranged.
FAQ About ASTM A871 Grade 65 Type 1 Steel
What is ASTM A871 Grade 65 Type 1 steel?
It is a high-strength low-alloy structural steel plate with atmospheric corrosion resistance. It has a minimum yield strength of 65 ksi (450 MPa) and is primarily intended for tubular structures, poles and other suitable outdoor applications.
Is ASTM A871 Grade 65 Type 1 Corten steel?
ASTM A871 Grade 65 Type 1 is a weathering steel and is often described commercially as Corten steel. Technically, ASTM A871 is a material specification, while COR-TEN is a registered trademark.
Does A871 Grade 65 require painting?
Painting may not be required in suitable environments with alternating wet and dry exposure. Coatings should be considered for continuously wet, buried, heavily polluted or marine chloride environments.
What is the difference between Type 1 and Grade 65?
Grade 65 identifies the 65 ksi minimum yield-strength level. Type 1 identifies the required chemical-composition route. Both designations are needed when ordering ASTM A871 Grade 65 Type 1 plate.
Can ASTM A871 Grade 65 Type 1 be welded?
Yes. It can be welded using qualified structural welding procedures. Consumable strength, hydrogen control, preheating and weathering compatibility should be selected according to plate thickness and joint requirements.
Order ASTM A871 Grade 65 Type 1 Steel Plate
Gnee Steel supplies ASTM A871 Grade 65 Type 1 structural steel plate for transmission poles, lighting poles, tubular structures and outdoor industrial projects. Available services include cutting, bending, rolling, drilling, welding, pre-weathering, inspection, export packing and international shipping.
Please provide the required thickness, width, length, quantity, drawings, inspection certificate and destination port for a quotation.
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