We supply Q310NQL2 hot-rolled steel plate, a high-performance weathering structural steel. It is alloyed with Cu (≥0.20%), Cr (0.40–0.75%), and Ni (≥0.20%) with precisely controlled composition and rolling processes.
In humid, industrial acid rain, and coastal salt-spray environments, it forms a dense, protective oxide layer that significantly improves corrosion resistance. Its atmospheric corrosion resistance is about 15–20% higher than standard weathering steels (such as SPA-H), and its overall service life in cyclic exposure conditions is about 45% longer than conventional carbon steel.
It is widely used in railway vehicles, shipping containers, and outdoor steel structures exposed to long-term harsh environments.
GNEE has over 18 years of experience in steel manufacturing and export, supplying Q310NQL2 high weathering structural steel plates to railway vehicle manufacturers, container producers, and outdoor infrastructure projects in more than 40 countries worldwide.
We support both large-scale engineering orders and small trial production requests, with a minimum order quantity (MOQ) as low as one piece.
To ensure long-term reliability in harsh wet-dry cycling and atmospheric corrosion environments, our Q310NQL2 hot-rolled steel plates are processed with customized TMCP (Thermo-Mechanical Controlled Processing) and normalizing treatments. Upon request, cyclic salt spray or atmospheric corrosion tests can also be conducted to verify weather resistance performance.
Thickness tolerances are strictly controlled according to standard specifications, and flatness is maintained within 3–5 mm per meter, meeting the stringent requirements of precision laser cutting and automated welding applications.
Furthermore, all Q310NQL2 plates undergo a comprehensive pre-shipment inspection, including 100% mechanical and low-temperature impact testing verification, PMI (Positive Material Identification) chemical analysis, Ultrasonic Testing (UT), and flatness checks.
Products are supplied with EN 10204 3.1 or 3.2 Material Test Certificates (MTC) and fully certified by ISO 9001, SGS, and BV third-party authorities.
Q310NQL2 High Structure Corten Steel Plate Specification
| Item | Specification |
|---|---|
| Product Name | Q310NQL2 High Weathering Structural Steel Plate |
| Material Grade | Q310NQL2 |
| Standard | GB/T 4171 (Weathering Structural Steel Standard) |
| Product Form | Hot Rolled Steel Plate / Steel Sheet |
| Thickness Range | 3.0 mm – 100 mm |
| Width Range | 1000 mm, 1219 mm, 1500 mm, 1800 mm, 2000 mm |
| Length Range | 2000 mm – 12000 mm (customizable) |
| Surface Condition | Hot Rolled, Pickled, Oiled (optional) |
| Manufacturing Process | TMCP (Thermo-Mechanical Controlled Processing), Controlled Rolling & Cooling |
| Delivery Condition | As Rolled / Normalized / Controlled Rolled |
| Weathering Elements | Cu (≥0.20%), Cr (0.40–0.75%), Ni (≥0.20%) |
| Certification | EN 10204 3.1 / 3.2, ISO 9001 |
| Inspection | Chemical Analysis, Mechanical Testing, Ultrasonic Testing (UT), Salt Spray Test (optional) |
| Packaging | Waterproof Paper, Steel Strapping, Wooden Pallets, Export Seaworthy Packing |
Chemical Composition of Q310NQL2 Weathering Steel Plate
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | 0.25 – 0.75 |
| Manganese (Mn) | 0.20 – 0.50 |
| Phosphorus (P) | 0.06 – 0.12 |
| Sulfur (S) | ≤ 0.020 |
| Copper (Cu) | 0.25 – 0.45 |
| Chromium (Cr) | 0.30 – 1.25 |
| Nickel (Ni) | 0.12 – 0.65 |
Mechanical Properties of Q310NQL2 Weathering Steel Plate
| Property | Value |
|---|---|
| Yield Strength (ReH) | ≥ 310 MPa |
| Tensile Strength (Rm) | 440 – 570 MPa |
| Elongation (A) | ≥ 22% |
| Impact Toughness | ≥ 27 J (at 0°C) |
| Elastic Modulus | ~200 GPa |
| Poisson's Ratio | ~0.30 |
| Density | 7.85 g/cm³ |
| Hardness | ≤ 160 HB |
| Corrosion Resistance | 15–20% higher than conventional weathering steel (SPA-H equivalent) |
What is difference between the Q310NQL2 vs SPA-H
Q310NQL2 and SPA-H are both weathering steels, but they differ in strength and standards. Q310NQL2 (GB/T 4171) has a yield strength of ≥310 MPa, while SPA-H (JIS G3125) is typically around ≥355 MPa.
Both contain Cu–Cr–Ni alloy systems for atmospheric corrosion resistance. SPA-H is more widely used in containers and railway vehicles, while Q310NQL2 is commonly used in general structural and export engineering applications.
What is difference between the Q310NQL2 vs ASTM A588 Grade K
Q310NQL2 and ASTM A588 Grade K are both high-strength weathering steels. Q310NQL2 provides a yield strength of ≥310 MPa, while ASTM A588 Grade K offers a higher level of ≥345 MPa.
Both achieve atmospheric corrosion resistance through Cu–Cr–Ni alloying and protective rust layer formation. A588 Grade K is mainly used in bridges and heavy structures in the US market, while Q310NQL2 is more focused on cost-effective structural and transportation projects in global markets.
Applications of Q310NQL2 weathering steels
Recently, Gnee successfully delivered a batch of customized Q310NQL2 high weathering structural steel plates to a domestic transportation equipment manufacturer. The products fully met the customer's requirements in mechanical properties, surface quality, and dimensional accuracy.
Q310NQL2 is a hot-rolled/cold-rolled atmospheric corrosion resistant steel. By adding alloying elements such as Cu, Cr, and Ni, its weathering performance is significantly improved. Its atmospheric corrosion resistance is typically 2–4 times higher than ordinary carbon steel.
In humid, salt spray, and industrial atmospheric environments, it can form a dense protective rust layer, which extends service life by approximately 1.5–2 times (or improves durability by 30–50%), while significantly reducing maintenance and recoating costs. In general engineering practice, the total lifecycle maintenance cost can be reduced by about 20–40%. This material is widely used in railway vehicles, shipping containers, and urban transportation equipment exposed to long-term outdoor service conditions.
Due to its complex alloy system, Q310NQL2 requires strict control of smelting purity, TMCP (Thermo-Mechanical Controlled Processing), and surface quality, which places higher demands on production stability.
To address these technical challenges, Gnee applies strict chemical composition control and refining processes, combined with advanced TMCP controlled rolling and cooling technology to precisely optimize microstructure and cooling paths. Multiple surface inspections and in-process quality control are also implemented to ensure consistent strength, toughness, and weather resistance performance.
If you are looking for high weathering steel materials for railway vehicles, containers, or transportation equipment, Gnee can reliably supply Q310NQL2 high weathering structural steel plates with customized sizes, testing services, and export-standard packaging. Please share your project requirements, and we will provide the most suitable material solution along with a professional quotation and technical support within 24 hours.
Click to get the FOB price for Q310NQL2 steel plate
Q310NQL2 Reference Price
| Product Form | Specification | Price Range (USD/ton) |
|---|---|---|
| Hot Rolled Plate | Q310NQL2 | 650 – 900 |
| Cold Rolled Coil | Q310NQL2 | 700 – 980 |
| Pickled & Oiled Plate | Q310NQL2 | 680 – 950 |
| Export Standard (cut size / tested) | Q310NQL2 | 750 – 1,050 |
Quality Control of Q310NQL2 Weathering Steel
1. Standard Mechanical & Chemical Tests
2. Dimensional & Appearance Inspection
3. Weathering & Performance Related Tests (Optional / Project Based)
4. NDT (Non-Destructive Testing) – if required
Gnee provides one-stop customized processing services for Q310NQL2 weathering steel plates, helping customers reduce processing costs and improve delivery efficiency. Our services are designed to meet the requirements of structural engineering, transportation equipment, and export projects.
We offer precision cutting services, including laser cutting, plasma cutting, and waterjet cutting, ensuring accurate dimensions and clean edges according to customer drawings.
Surface treatment options are available, such as oiling and shot blasting, to improve surface condition and enhance corrosion resistance during transportation and storage.
In addition, heat treatment services such as normalizing can be provided upon request to optimize mechanical properties and ensure stable performance in demanding applications.
All processing services can be customized according to project requirements, supporting flexible sizes, technical standards, and export packaging solutions.
