What Are High Yield Plates and Why Are They Crucial for Structural Engineering?
High Yield Plates are a category of high-strength structural steel sheets engineered to support exceptionally heavy loads over extended spans — without compromising on safety, flexibility, or durability. These plates are known for their superior yield strength, typically ranging from 500 MPa to over 1100 MPa, which allows them to absorb intense pressure and stress in critical load-bearing applications.
In long-span structures like bridges, airport terminals, crane arms, offshore platforms, and industrial warehouses, High Yield Steel Plates ensure load efficiency, material economy, and lighter structural weight, reducing both construction time and cost.
At Champak Industries, we specialize in supplying globally trusted high-yield plates including S1100QL, S690QL, S550MC, NAXTRA 70, and other performance-driven grades — tailored for industrial engineering challenges.
Key Applications of High Yield Plates in Long-Span Components
Buyers and engineers across industries rely on high yield structural plates to build components such as:
- Bridge Girders and Trusses
- Crane Booms and Derrick Structures
- Offshore Oil Rigs and FPSO Modules
- Transmission Towers and Wind Turbine Frames
- Excavator Arms and Mining Equipment
- Space Frames for Industrial Warehouses
- Aircraft Hangars and Large Logistic Hubs
Their lighter weight-to-strength ratio allows more efficient structural design without adding unnecessary bulk — a key factor in dynamic load environments.
Mechanical Strength and Structural Performance of High Yield Grades
The standout feature of High Yield Steel Plates is their elevated yield stress. For example, S1100QL plates can handle stresses over 1100 MPa, making them ideal for extreme fatigue resistance, bending, and welding performance in aggressive conditions.
Key mechanical characteristics of high-yield grades include:
- Yield Strength: 550–1100 MPa+
- Tensile Strength: High ductility under dynamic loads
- Toughness: Excellent Charpy impact values, even at low temperatures
- Formability: Cold bending and fabrication friendly
- Fatigue Resistance: Ideal for repetitive-load structural elements
Chemical Composition and Metallurgical Stability
While exact chemistry varies by grade, high-yield plates like S1100QL and S690QL are typically alloyed with:
- Carbon (C) – for base hardness
- Manganese (Mn) – to boost tensile strength
- Nickel (Ni), Chromium (Cr), and Molybdenum (Mo) – for improved toughness, corrosion resistance, and quenching response
- Boron (B) – in ultra-high-strength grades to enhance hardenability
Advanced heat treatment such as quenched and tempered processes further refine the microstructure, giving these plates their legendary strength and performance reliability.
Global Standards and Equivalent Grades for High Yield Plates
High Yield Steel Plates conform to several globally accepted standards that ensure mechanical consistency, safety, and fabrication quality. Common equivalents include:
- EN 10025-6: S690QL, S890QL, S960QL, S1100QL
- ASTM A514: High-yield quenched and tempered alloy steel
- Dillimax 690T / 890T / 1100T
- JFE HITEN 780LE / 1180
- NAXTRA 70 / 100
- Strenx® Series by SSAB
These plates meet stringent test criteria for tensile properties, impact resistance, weldability, and dimensional tolerances.
Plate Thickness, Widths, and Dimensional Range
At Champak Industries, our inventory includes high yield plates in a wide range of thicknesses, widths, and custom cuts:
- Thickness: 4 mm to 150 mm
- Width: 1000 mm to 3000 mm
- Length: Up to 12 meters or as per client requirement
- Custom Cutting: Plasma, Laser, Oxy-Cutting available
- Tolerances: As per EN 10029, ASTM A6, or buyer-specified standards
Buyers can request cut-to-length, profiled, or CNC-shaped plates for immediate fabrication.
Weldability, Machining, and Forming Properties
One of the reasons high-yield plates are preferred is their excellent weldability and workability:
- Welding Compatibility: Suitable for GMAW, SMAW, SAW processes
- Cold Bending: Excellent for forming without cracking
- Low Preheat Requirements: Reduces welding complexity
- Machining Performance: Easy drilling, shearing, and plasma cutting
Proper welding guidelines must be followed for thicker sections or ultra-high-strength grades (e.g., S1100QL).
Why Engineers and Structural Designers Prefer High Yield Steel Plates
✔ Weight Reduction: Lighter designs with same or better strength
✔ High Fatigue Resistance: Withstands cyclic loads in bridges, cranes
✔ Cost Savings: Less material used = lower fabrication & transport cost
✔ Optimized Designs: Enables architectural and engineering creativity
✔ Improved Sustainability: Less raw steel = lower carbon footprint
For long-span infrastructure or mobile lifting equipment, these plates offer unmatched performance-to-weight ratios.
Why Choose Champak Industries as Your High Yield Plate Supplier?
Champak Industries is a trusted supplier of S690QL, S550MC, NAXTRA 70, S1100QL, and other high-yield steels. Here’s why global buyers rely on us:
- ✅ Direct sourcing from reputed mills in Europe, Japan & Korea
- ✅ In-house cutting, testing, and documentation services
- ✅ Material traceability with MTC, EN 10204 3.1/3.2 certification
- ✅ Fast turnaround and global shipping support
- ✅ Decades of expertise in industrial-grade steel solutions
Our client base includes infra builders, EPC contractors, OEMs, bridge fabricators, and heavy machinery manufacturers.
Related High Yield Grades Supplied
We maintain ready stock of:
- EN 10025-6 S690QL / S890QL / S960QL / S1100QL
- Dillimax 690T / 890T / 1100T
- NAXTRA 70, 100, 120
- Strenx® 700 / 900 / 1100
- JFE HITEN 780LE / 1180
- ASTM A514 / A517 High Strength Grades
Each grade is supplied with proper markings, third-party inspection support, and export packaging on request.
Export Destinations and Packaging Support for Global Projects
Champak Industries proudly supplies high yield steel plates to global clients involved in infrastructure and heavy engineering:
📦 Countries We Export To:
- UAE, Saudi Arabia, Qatar, Oman, Kuwait
- Vietnam, Malaysia, Indonesia, South Korea
- South Africa, Kenya, Nigeria, Egypt
- USA, Canada, Mexico, Brazil
- Germany, France, Italy, Spain
📦 Packaging Solutions:
- Seaworthy wooden pallets & steel strip bundles
- Water-resistant wrapping + rust-preventive coating
- Steel identification marking with heat number traceability
- 100% compliance with ISPM 15, SGS, BV, TUV standards
Bulk shipments are containerized and tagged as per project or EPC contractor’s specifications.
How to Select the Right High Yield Plate Grade?
Here’s a simplified selection chart to help you choose:
| Application | Recommended Grade | Key Property Focus |
|---|---|---|
| Bridge & Structural Girders | S690QL, NAXTRA 70 | High load-bearing, weldable |
| Cranes & Lifting Equipment | S1100QL, Dillimax 1100T | Ultra-high strength & formability |
| Construction Machinery | S550MC, JFE HITEN 780LE | Toughness + fatigue resistance |
| Offshore / Marine Use | S690QL + NACE | Corrosion + strength |
| Lightweight Vehicle Frames | S700MC, Strenx 700 | Weight reduction + ductility |
🛠️ Still unsure? Contact our team to help you match your load, fatigue, and forming requirements with the right plate.
Certifications and Mill Test Reports
Champak Industries ensures 100% traceability and compliance with all industry norms:
✅ EN 10204 3.1 / 3.2 Mill Test Certificates
✅ Third-party inspection by Lloyd’s, BV, SGS, TUV, DNV
✅ ISO 9001:2015 certified quality system
✅ CE marking and PED compliance (if required)
✅ Dimensional and ultrasonic test reports upon request
We also assist buyers with import documentation, LC support, and regulatory clearance as required for export orders.
Request a Price Quote or Technical Datasheet
🔎 Looking to source High Yield Structural Steel Plates for your next project?
📥 Get in touch with our application engineers to:
- Receive updated pricing with MoQ & lead time
- Request technical data sheets and welding advice
- Get help in plate selection based on project load, span, or forming requirement
- Request bulk order pricing with cutting/tolerance options
📧 Request a Quote Now »
📞 Or call us for custom sizing, export orders, or mill traceability needs
15 FAQs with Answers
- What are high yield steel plates used for?
High yield steel plates are used in construction, heavy machinery, bridges, cranes, and other structures where high load-bearing capacity is needed with reduced weight. - Which grade of high strength steel is used in bridge fabrication?
Grades like S690QL, NAXTRA 70, and S700MC are commonly used for bridge components due to their strength-to-weight ratio and weldability. - Is S690QL stronger than mild steel?
Yes, S690QL is much stronger than mild steel. It offers a minimum yield strength of 690 MPa compared to around 250 MPa for mild steel. - What is the tensile strength of EN 10025-6 S1100QL?
EN 10025-6 S1100QL has a tensile strength between 1200–1500 MPa, making it one of the strongest quenched and tempered plates available. - Can high yield plates be welded easily?
Yes, most high yield plates like S690QL and S550MC can be welded using standard welding procedures, though preheating and post-weld care may be required based on thickness. - Which is better: S690QL or JFE HITEN 780LE?
Both are high-performance plates. S690QL is used in general construction, while JFE HITEN 780LE offers excellent toughness and is often used in automotive and heavy machinery. - Are NAXTRA plates good for load-bearing structures?
Yes, NAXTRA 70 and NAXTRA 100 are ideal for structural components under high stress, such as bridges, frames, and lifting arms. - Do high strength plates reduce weight in designs?
Absolutely. Using high yield plates allows engineers to reduce the thickness of components without compromising strength — leading to lighter and more efficient structures. - Can these plates be used in cold climates or sub-zero conditions?
Yes. Grades like S690QL and S890QL come with impact-tested variants (like S690QL1) that perform reliably in low-temperature environments. - What is the price per ton of high yield plates in India?
Prices vary by grade, thickness, and market conditions, but generally range from ₹90 to ₹150 per kg. For exact pricing, it’s best to request a quote. - Are Strenx or Dillimax plates available from Champak Industries?
Yes, Champak Industries supplies alternatives to Strenx and Dillimax including S1100QL, Dillimax 690T, and JFE HITEN 780LE. - How are high yield plates packed for export shipments?
Plates are packed in seaworthy bundles with rust-proof wrapping, edge protection, and wooden skids, ensuring safe delivery worldwide. - What is the difference between high tensile and high yield plates?
High tensile relates to resistance to breaking under tension, while high yield refers to the stress point where permanent deformation begins. Both are important in structural performance. - Do you offer plasma or waterjet cutting for S1100QL?
Yes. Champak Industries offers CNC plasma, laser, and waterjet cutting services with close tolerance for high-strength plates like S1100QL. - 15. Can I get third-party inspection reports with delivery?
Yes, third-party inspections by Lloyd’s, SGS, TUV, BV, or customer-nominated agencies are available upon request with full documentation.
