ASTM A588 is the premier choice for projects requiring both high yield strength and exceptional atmospheric corrosion resistance. Often referred to as weathering steel, the A588 HSLA steel plate is a specific type of high strength low alloy steel plate designed primarily for use in welded bridges and buildings where savings in weight or added durability are important.
As a professional High Strength Steel Plate Manufacturer, GNEE provides premium A588 plates that form a protective, rust-like patina when exposed to the elements, eliminating the need for painting and reducing lifetime maintenance costs.
Who is GNEE? Your Trusted High Strength Steel Plate Manufacturer
GNEE Steel is a world-class high strength steel plate manufacturer and one of the most reliable heavy structural steel plate suppliers in the global market. With a factory footprint that spans thousands of square meters, we specialize in the production and distribution of hot rolled high strength steel plate.
Our state-of-the-art workshop utilizes precision rolling and heat treatment processes to ensure every structural steel plate meets the rigorous requirements of ASTM A588. Whether you are searching for high strength steel plate for construction or specialized high strength steel plate for engineering machinery, GNEE delivers certified quality directly from our warehouse to your site.
What is A588 HSLA Steel Plate?
ASTM A588 is a High-Strength Low-Alloy (HSLA) structural steel specification with improved atmospheric corrosion resistance for structural shapes such as angles, channel and beams, as well as steel plate and bars.
As a leading High Strength Steel Plate Manufacturer, we produce A588 in four main grades: A, B, C, and K.
The primary advantage of this HSLA steel plate is its "weathering" ability. Unlike standard carbon steel, A588 develops a protective oxide layer that inhibits further corrosion, making it an ideal high strength steel plate for construction in outdoor environments.
Chemical Composition of A588 High Strength Low Alloy Steel Plate
The unique corrosion resistance of A588 comes from its specific alloying elements, including Copper, Chromium, and Nickel. Below is the chemical breakdown for the most common grades provided by GNEE, your expert heavy structural steel plate suppliers.
A588 Chemical Composition Table (%)
| Grade | Carbon (C) | Manganese (Mn) | Silicon (Si) | Copper (Cu) | Chromium (Cr) | Nickel (Ni) | Vanadium (V) |
| A588 Grade A | 0.19 max | 0.80–1.25 | 0.30–0.65 | 0.25–0.40 | 0.40–0.65 | 0.40 max | 0.02–0.10 |
| A588 Grade B | 0.20 max | 0.75–1.35 | 0.15–0.50 | 0.20–0.40 | 0.40–0.70 | 0.50 max | 0.01–0.10 |
| A588 Grade C | 0.15 max | 0.80–1.35 | 0.15–0.40 | 0.20–0.50 | 0.30–0.50 | 0.25–0.50 | 0.01–0.10 |
| A588 Grade K | 0.17 max | 0.50–1.20 | 0.25–0.50 | 0.30–0.50 | 0.40–0.70 | 0.40 max | 0.01–0.10 |
Mechanical Properties of A588 Structural Steel Plate
A588 is prized not just for its chemistry, but for its physical performance. It is a true high tensile steel plate, offering a minimum yield strength of 50,000 psi (345 MPa) for thicknesses up to 4 inches.
A588 Mechanical Performance Table
| Property | Value (Up to 4" / 100mm Thickness) | Value (4" to 8" Thickness) |
| Yield Strength (min) | 50 ksi (345 MPa) | 42–46 ksi |
| Tensile Strength (min) | 70 ksi (485 MPa) | 63–67 ksi |
| Elongation in 2" (min) | 21% | 21% |
| Elongation in 8" (min) | 18% | --- |
As a high strength steel plate manufacturer, GNEE ensures that all hot rolled high strength steel plate undergoes tensile and bend tests to guarantee these values.
ASTM A588 steel has a yield strength of at least 50,000 psi (340,000 kPa) and an ultimate tensile strength of 70,000 psi (480,000 kPa) for all rolled shapes and thicknesses up to 4 inches (100 mm) Yield strength of at least 46,000 psi (320,000 kPa) and an ultimate tensile strength of at least 67,000 psi (460,000 kPa) for 4-5 inches (102-127 mm) thick plate;
and at least 67,000 psi (460,000 kPa) for 5-8 inches (127-203 mm) thick plate.
Yield strength of at least 46,000 psi (320,000 kPa) and ultimate tensile strength of at least 67,000 psi (460,000 kPa) for 4-5 inch (102-203 mm) thick steel plates; yield strength of at least 42,000 psi (290,000 kPa) and ultimate tensile strength of at least 63,000 psi (430,000 kPa) for 5-8 inch (127-203 mm) thick steel plates.
Similar material of weathering-resistant steel
The main atmospheric corrosion-resisting steel grades are: Corten A, Corten B; ASTM A588; ASTM A242; EN10025-5 EN10155 S235J0W, S235J2W, S355J0WP, S355J2WP, S355J0W; TBT1979 09CuPCrNi-A, 05CuPCrNi, GBT4171 Q355GNH, Q235NH, Q295NH, Q355NH; JIS G3125 SPA-H, SPA-C; and so on.
Supplementary Requirements
Supplementary requirements shall not apply unless specified in the order or contract. Standardized supplementary requirements for use at the option of the purchaser are listed in Specification A6/A6M. Those that are considered suitable for use with this specification are listed:
S2. Product Analysis
S3. Simulated Post-Weld Heat Treatment of Mechanical Test Coupons.
S5. Charpy V-Norch Impact Test
S6. Drop-Weight Test for material 0.625 in 16mm and over in Thickness.
S8. Ultrasonic Examination.
S15. Reducion of Area Measurement.
S18. Maximum Tensile Strength
S30. Charpy V-Notch Impact Test for Structual Shapes Alternate Core Location and
S32. Single Heat Bundles
One-Stop Weathering Steel Fabrication Services
Our Core Processing Capabilities
Precision Laser Cutting & Hollow Carving
Using high-power CNC laser and plasma machines, we can cut complex geometric patterns, decorative screens, and custom profiles according to your CAD/DWG files with millimeter precision and clean edges.
Bending, Drilling & Welding
From heavy-duty structural drilling to precise angle folding and full-penetration welding, our in-house engineers prepare the plates exactly as your project demands, saving your local fabricators days of work.
Accelerated Pre-Weathering / Rapid Rusting
Can't wait 6 to 12 months for nature to do its job? We utilize eco-friendly chemical treatments to instantly generate that beautiful, rich orange-brown rust patina in our factory. Your steel arrives looking perfectly aged on day one.
Rust Sealing & Surface Curing
Are you worried about rust stains bleeding onto your concrete or marble floors? We apply a specialized transparent curing sealer to lock in the rust layer. This stops the rust from transferring or washing off in the rain, ensuring a clean and maintenance-free architectural finish.
Advantages of Using A588 High Strength Steel Plate for Construction
Why do engineers and architects choose A588 over other HSLA steel plate options?
- Corrosion Resistance: It is roughly four times more resistant to atmospheric corrosion than plain carbon steel.
- Maintenance Savings: Because it doesn't require painting, it significantly reduces long-term maintenance costs for bridges and towers.
- High Strength-to-Weight Ratio: As a high strength structural steel plate, it allows for thinner sections, reducing the overall weight of the structure.
- Aesthetic Appeal: The natural patina is often desired for architectural projects like sculptures and building facades.
Common Applications: High Strength Steel Plate for Engineering Machinery and Bridges
A588 is versatile. While it is the "bridge steel" of choice, its durability makes it an excellent high strength steel plate for engineering machinery and heavy transport.
- Bridges and Highways: Used for girders, trusses, and pylons where salt and moisture are prevalent.
- High Strength Steel Plate for Cranes: Used in mobile crane components that are exposed to outdoor weather conditions.
- High Tensile Steel Plate for Trailers: Specifically for heavy-duty trailers used in mining or logging.
- Industrial Structures: Used in smokestacks, transmission towers, and storage tanks.
Comparison: A588 vs. A572 and Equivalent Grades
In the world of structural steel plate, A588 is frequently compared to A572. While both are high strength low alloy steel plates with 50ksi yield strength, A572 lacks the weathering elements (Copper and Chromium) found in A588.
Grade Equivalents
- Corten B: A588 Grade B is often considered the equivalent to the proprietary Corten B.
- EN 10025-5: S355J2W is the closest European equivalent to A588.
- ISO 630-4: S355W is the international standard equivalent.
FAQ
Does A588 steel plate need to be painted?
No. A588 is designed to be used in its unpainted condition. The protective rust layer prevents further degradation.
Can GNEE provide custom sizes?
Yes, as a high strength steel plate manufacturer, we offer custom cutting, drilling, and grinding to your project specifications.
What is the maximum thickness available?
GNEE supplies A588 hot rolled high strength steel plate up to 8 inches (200mm) thick.
What is A588 steel equivalent to?
Corten A steel plate
The ASTM A588 grade A plate is equivalent to Corten A steel plate. ASTM A242 plate is equivalent to Corten B.
What is A588 steel material?
A588 is a type of weathering steel that's renowned for its exceptional corrosion resistance. With its unique ability to form a protective rust-like surface, it eliminates the need for additional coatings, reducing maintenance costs. ASTM A588 is also referred to as Corten® and covers structural shapes, plate, and bar.
What is the difference between A36 and A588 steel?
While A36 typically requires a coating like galvanization for corrosion resistance, A588 steel is known as a "weathering steel" because it forms a copper-enhanced patina that can improve corrosion resistance without requiring a separate coating. These properties generally come with a higher price tag than A36.
What is the difference between A588 and A572 50?
A588 steel weathering plate offers all the advantages of ASTM A572-50. But, it is produced with elevated levels of copper to add advanced corrosion resistance and longer life in applications where element exposure is a crucial factor.
What is the difference between Grade A and B in A588?
Choose Grade A if the design prioritizes weldability and higher silicon content is acceptable. Choose Grade B for slightly thicker sections or when higher manganese content might improve formability or impact toughness.
Why Choose GNEE as Your Heavy Structural Steel Plate Suppliers?
Choosing GNEE means choosing reliability. We are not just traders; we are heavy structural steel plate suppliers with deep technical knowledge.
- Full Traceability: Every plate comes with a Mill Test Certificate (MTC) according to EN 10204 3.1.
- Processing Power: We offer shot blasting, priming, and precision CNC cutting.
- Global Logistics: We have decades of experience shipping high strength steel plate to North America, Europe, and Southeast Asia.
Conclusion: Get Your A588 High Strength Steel Plate Quote Today
In the demanding world of infrastructure, ASTM A588 stands out as the premier high strength structural steel plate for longevity and performance. Its unique weathering properties combined with high yield strength make it the smart choice for any outdoor application.
Whether you are building a bridge, a crane, or an industrial facility, GNEE is the high strength steel plate manufacturer you can trust to deliver excellence.
Stop worrying about corrosion and start building for the future.
Contact GNEE today for a Free Consultation and Quote on A588 HSLA steel plate. Our experts are ready to provide the technical support and competitive pricing you need.
high strength low alloy steel plate Products image
GNEE group team photo
GNEE group customer visit
GNEE Group participates in foreign steel exhibitions
We have enough A588 HSLA Steel Plate in stock, and we can also customize it according to your needs.
Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.
GNEE STEEL PROCESSING
1.CTL & SL SERVICE (141 SETS)
Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.
CTL FACILITIES
Max Length:16500mm
Max Width:2200mm
Max Thickness:25.4mm
Max Yield Strength:1500Mpa
SL FACILITIES
Max Width:2200mm
Max Thickness:18mm
Max slit Quantity:31
Max Yield Strength:1200Mpa
2.CUTTING SERVICE
GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.
Laser Cutting Machine
Max Cutting Length:40,000mm
Max Width:4,600mm
Max Thickness:100mm
Flame Cutting Machine
Max Cutting Length:40,000mm
Max Width:8,000mm
Max Thickness:500mm
Plasmas Cutting Machine
Max Cutting Length:30,000mm
Max Width:5,000mm
Max Thickness:100mm
Water-jet Cutting
Max Cutting Length:12,000mm
Max Width:4,010mm
Max Thickness:250mm
3.FORMING SERVICE
Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm
Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm
Expert in Bending High-Strength & Wear-Resistant Steels
Punching Machine
Max Width:3,070mm
Max Thickness:8mm
Max Pressure:250t
BEVELING SERVICE
GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.
Milling：
Max Cutting Length:18,000mm
Max Width:4500mm
Max Thickness:120mm
Beveling:
Max Length:16,000mm
Max Thickness:80mm
MACHINING SERVICE
GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.
Gantry Type Boring & Milling Maching Center
Max Length:48000mm
Max Width:12500mm
Max Height:8000mm
Max Diameter:10500mm
Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm
MMulti-hole Drilling Equipment
Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm
Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m
Vertical Lathe
Max Height:6,000mm
Max Diametar:φ22,00mm
Automated Edge Milling Machine
The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.
It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.
Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.
Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons
This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.
- Processing Accuracy
Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;
Width accuracy: ±1mm;
Diagonal accuracy: ±2mm;
Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.
- Processing Efficiency
The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.
HEAT TREATMENT
Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t
Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head
Case : Steel Plates Supply for 100,000m³ Full Containment Ammonia Storage Tank Project
GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.
One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.
Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production
Project Materials and Technical Requirements
The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.
Key technical specifications include:
- Material grades: P355NL2 and P275NL2 (Normalized)
- Yield strength: Standard minimum / Maximum limited to 390 MPa
- Hardness: ≤ 225 HBW in base material
- Impact testing: Charpy-V notch test at -50°C, minimum 27J
- Certification: EN 10204 3.1 certificate, with optional 3.2 certification
These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.
Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.
Project Plate Quantities and Thickness Distribution
The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:
P355NL2 – Inner & Outer Tank Shell Plates
- Lower shell courses: 50 mm thickness – approx. 2,000 tons
- Middle shell courses: 25 mm thickness – approx. 1,400 tons
- Upper shell courses: 10 mm thickness – approx. 500 tons
P275NL2 – Tank Bottom Plates
- Thickness: 10–15 mm – approx. 750 tons
P275NL2 – Suspended Roof Structure
- Thickness: 5–8 mm – approx. 180 tons
S275JR – Outer Roof (Ambient Structure)
- Thickness: 10 mm – approx. 450 tons
To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.
Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.
GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.
| TYPE | GRADE | SPECIFICATIONS |
| Carbon Steel / Low Alloy Coil | Q235A/B/C/D/Q355B(Q345B)/C/D/E/SS400/SAPH400-C/ASTMA283Grade C |
0.7~2.0*1250/1500mm*C 2.3~19.5*1250/1500/1800/2000mm*C |
| Medium Heavy Plate | Q235B/Q355B(Q345B)/C/D/E | 6.0-200x150mm-4000mmxL |
| Vessel Plate |
Q245R/Q345R/HP295/SA516MGR485/SA516GR70/P355NL2/P275NL2/ S275JR//SPV490/ASTM A537 Class 1/Class 2 |
2.5-120x1500mm-3000mmxL |
| High Strength Steel |
510L/610L/700L/750L/BS600MCK4/BS700MCK2/BS700MCK4/ BS960E/BWELDY700QL2/L4/BWELDY960QL4/HG60D/70D/785D/ Q460D/Q550D/690D/690E/TQ600MCD/TQ700MCD/S700MCD/ WYS600/700/STRENX700MCE/Q490E/Q490D |
1.2-60x 1500mm-2500mmxL |
| Patterned Steel | HQ235A|B | 1.2-60x 1500mm-2500mmxL |
| Wear-resistance Steel |
NM360/400/450/500/NM300TP/400TP/450TP/ ABREX400/450/500/B-HARD450XKY/ CREUSABRO4800/8000/EH C400LE/450LE/500LE/ |
3.0-50x1250mm-3300mmxL |
| Cold Rolled Coil | DC01/RECC/REDT/SPCC/ST12 | 0.5-3.0x1250mm-1500mmxC |
| Galvanized Plate | DC51D+AZ/DC51D+Z/DX51D+Z/SGH340+Z275/Z275/Z120/S350GD+ZM275 | 0.45-3.0x1250mm-1500mmxC |
| Pickled Coil | DD11/SPHC | 2.0-6.0x1500xC |
Stainless Steel Material and Surface Specifications
| TYPE | GRADE | THICKNESS | SURFACE |
| Austenitic | 304/304H/304L/304J1 | 0.25-150mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 321 | 0.4-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 316/316L/317L/316Ti | 0.3-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 201(J1/J2/J5) | 0.35-12mm | 2B/NO.1/1D |
| Ferrite | 430 | 0.4-3.0mm | 2B/BA/NO.4/8K/SB/HL |
| Ultra Pure Ferrite | 443 | 0.4-2.0mm | 2B |
| Ultra Pure Ferrite | 436L/439/444/441 | 0.5-3.0mm | 2B/2D |
Special Steel / Nickel Base Alloy
| TYPE | GRADE | GRADE (ASTM) | GRADE (EN) | THICKNESS |
| Heat-resistant Steel | 309S | S30908 | 1.4833 | 0.5-40mm |
| Heat-resistant Steel | 310S | S31008 | 1.4845 | 0.5-40mm |
| Duplex Stainless Steel | 2101 | S32101 | 1.4162 | 1.5-50mm |
| Duplex Stainless Steel | 2304 | S32304 | 1.4362 | 3.0-50mm |
| Duplex Stainless Steel | 2205 | S32205/S31803 | 1.4462 | 0.5-60mm |
| Duplex Stainless Steel | 2507 | S32750 | 1.4410 | 1.0-60mm |
| Super Austenitic-Steel | 904L | N08904 | 1.4539 | 0.6-50mm |
| Super Austenitic-Steel | 254SMO | S31254 | 1.4547 | 0.5-50mm |
| Super Austenitic-Steel | 1.4529 | N08926 | 1.4529 | 0.5-50mm |
| Super Austenitic-Steel | AL-6XN | N08367 | 1.4478 | 0.5-50mm |
| Nickel Base Alloy | Alloy 31 | N08031 | 1.4562 | 1.0-50mm |
| Nickel Base Alloy | 800 | N08800 | 1.4876 | 0.8-50mm |
| Nickel Base Alloy | 800H | N08810 | 1.4958 | 0.8-50mm |
| Nickel Base Alloy | 800HT | N08811 | 1.4959 | 0.8-50mm |
| Nickel Base Alloy | Alloy 28 | N08028 | 1.4563 | 1.0-20mm |
| Nickel Base Alloy | Alloy 20 | N08020 | 2.4660 | 1.0-20mm |
| Nickel Base Alloy | 825 | N08825 | 2.4858 | 0.8-40mm |
| Nickel Base Alloy | C276 | N10276 | 2.4819 | 0.5-50mm |
| Nickel Base Alloy | C22 | N06022 | 2.4602 | 1.0-50mm |
| Nickel Base Alloy | 625 | N06625 | 2.4856 | 0.8-20mm |
| Nickel Base Alloy | 400 | N04400 | 2.4360 | 1.0-20mm |
| Nickel Base Alloy | 600 | N06600 | 2.4816 | 1.0-50mm |
| Nickel Base Alloy | Pure Ni 201 | N02201 | 2.4061 | 0.5-20mm |
| Titanium | TA1 | Gr.1 | Class 1 | 0.5-50mm |
| Titanium | TA2 | Gr.2 | Class 2 | 0.5-50mm |
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