When designing bridges and heavy load-bearing structures, strength, durability, and safety are non-negotiable. NAXTRA 70 plates—a quenched and tempered high-yield structural steel—deliver remarkable tensile strength (≈ 690 MPa) and toughness even in extreme environments, making them an essential choice for infrastructure and industrial construction.
What Are NAXTRA 70 High-Yield Steel Plates?
NAXTRA 70 plates are steel grades produced under the EN 10025-6 standard, featuring a complex alloy and quench-and-temper treatment that enhances bending, welding, and impact resistance. These plates are engineered for outstanding performance in heavily stressed applications.
Common aliases and equivalent grades include:
- S690QL
- Dillimax 690T
- JFE HITEN 780 LE
- Weldox 700
Key Applications in Bridges & Load-Bearing Structures
NAXTRA 70 plates are trusted for:
- Bridge deck slabs and support girders needing high fatigue resistance
- Structural beams and trusses in heavy infrastructures
- Transport load-bearing chassis for trailers and trailers
- Infrastructure requiring leaner design, maximizing payload and reducing material use
- Cold-climate structures, benefiting from impact-tested toughness at –40 °C and beyond(alloysteelplates.com)
Common Structural Engineering Questions
Structural designers often ask:
- How does NAXTRA 70 perform under fatigue loading compared to ordinary structural steel?
- Is it weldable for on-site steel erection and field connections?
- What are the standard sizes and test certifications available?
- Can it enable lightweight, yet stronger structural design for bridges and load-bearing frames?
This blog will explore those questions and illustrate how Champak Industries delivers NAXTRA 70 plates tailored to infrastructure and industrial structural applications.
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Technical Standards and Equivalent Grades
NAXTRA 70 conforms to stringent high-yield steel standards like:
- EN 10025-6 S690QL
- ASTM A514 / A517
- Weldox 700 / Dillimax 690T
- JFE HITEN 780LE
These equivalencies ensure global material compatibility, whether you’re building European-standard bridges or custom load-bearing structures for international tenders.
Champak Industries sources genuine NAXTRA 70 plates that come with:
- EN 10204 3.1 / 3.2 certification
- Ultrasonic tested (UT) reports
- Charpy V-notch impact test (CVN) results up to –40°C
- CE marking and weldability certifications
Thickness Range, Dimensions & Plate Sizes
Champak Industries offers flexible inventory options:
- Thickness: 6 mm to 150 mm
- Width: Up to 2500 mm
- Length: Custom cut to 12000 mm or longer
- Tolerance: As per EN 10029 / ASTM A6 standards
These plates can be supplied as rolled, normalized, or Q+T depending on your load-bearing design needs.
Fabrication, Welding, and Bending Advice
Despite their high strength, NAXTRA 70 plates are engineered for ease of fabrication. With proper preheating and low-hydrogen electrodes:
- Welding is clean and crack-resistant
- Plates exhibit excellent bendability without micro-cracking
- CNC plasma cutting and forming are supported
- Ideal for modular steel bridge segments and heavy-load frames
Champak Industries can also guide you on low-temperature welding, edge prepping, and machining conditions suitable for structural bridge projects.
Advantages of Buying from Champak Industries
Why structural consultants, fabricators, and EPC contractors trust us:
- Ready stock of NAXTRA 70 plates in multiple sizes
- Immediate dispatch from our Mumbai and Gujarat yards
- Custom cutting and profile machining services
- Export to 20+ countries with marine-grade packaging
- All plates tested to EN 10160, EN 10025-6, and DNV/ABS norms
Similar High-Yield Plate Grades Available
We supply a full range of high-tensile alternatives for bridge and infrastructure work:
You can compare these with NAXTRA 70 based on strength-to-weight ratio, availability, and project-specific certifications.
Ready to Ship NAXTRA 70 Plates from Stock
Our Q+T high-yield plates are kept in export-ready condition. We support:
- Bulk orders for long-span bridges
- Small tonnage supply for retrofitting
- Engineering assistance for grade selection
💬 Connect via Contact Us for instant stock status or material matching.
Global Export Support and Secure Packaging
Champak Industries is a trusted NAXTRA 70 plate exporter to infrastructure contractors, fabricators, and EPC companies across:
- UAE, Saudi Arabia, Qatar, Oman (GCC projects)
- Vietnam, Indonesia, Philippines (bridge retrofitting)
- South Africa, Kenya, Nigeria (rail and highway overpasses)
- USA, Europe, Australia (modular steel construction)
We ensure:
- Export seaworthy packaging with end caps, wooden crates, and rust preventive coating
- Third-party inspection reports on request (Lloyds, DNV, TUV)
- Hassle-free port clearance and documentation support
When to Choose NAXTRA 70
Choose NAXTRA 70 when your application needs:
- High load-bearing strength with low plate weight
- Superior notch toughness and weldability
- Plate performance in dynamic stress environments
- Applications like bridge arches, crane girders, telescopic arms, outriggers, and modular bridge systems
Compared to other Q+T plates, NAXTRA 70 provides:
- Up to 30–40% weight savings in structural design
- Easier processing in automated welding lines
- Consistent performance in cold regions and seismic zones
Certifications, Quality Reports, and Testing
Every plate from Champak Industries is supplied with:
- Mill Test Certificate (MTC) EN 10204 3.1 / 3.2
- Charpy Impact Test Report
- CE and PED Compliance
- Ultrasonic Test Report (Level B or C)
- Chemical + Mechanical Test Reports
We ensure full traceability, batch certification, and compliance with ISO 9001:2015 standards.
Request Pricing, Stock, and Technical Datasheet
📩 Looking for competitive NAXTRA 70 plate prices or live stock availability?
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- 📞 Call our steel expert team for urgent project dispatch
- 📥 Download full technical datasheet or request dimensional drawings
🔒 100% verified Q+T material | 🔧 Custom cutting available | 🌍 Worldwide shipping
FAQs
Q1. What is NAXTRA 70 steel used for?
It’s used in bridge decks, crane structures, lifting booms, and heavy-load structural designs.
Q2. What is the tensile strength of NAXTRA 70 plates?
Tensile strength typically ranges between 900–1100 MPa, depending on thickness.
Q3. Are NAXTRA 70 plates weldable?
Yes, they support both MIG and SAW welding with proper preheat.
Q4. Can NAXTRA 70 be used in seismic zone structures?
Yes, its notch toughness and fatigue resistance make it ideal for dynamic stress areas.
Q5. Is NAXTRA 70 equivalent to S690QL?
Yes, both are high-yield Q+T plates with similar mechanical performance.
Q6. What is the difference between NAXTRA 70 and Weldox 700?
Both offer similar yield strength, but Weldox may offer enhanced bendability in some grades.
Q7. Where can I buy NAXTRA 70 plates in India?
From Champak Industries, a leading stockist and exporter.
Q8. Are test certificates provided for NAXTRA 70?
Yes, including MTC, ultrasonic, and impact test reports.
Q9. What sizes are available in NAXTRA 70?
Thicknesses from 6 mm to 150 mm, widths up to 2500 mm, and lengths to 12000 mm.
Q10. Is it suitable for bridge launching girders?
Yes, it is often selected for launching gantries and telescopic cranes.
Q11. What is the hardness of NAXTRA 70?
Typically around 250–300 HB, depending on section.
Q12. Can it be cut via plasma or laser?
Yes, both plasma and laser cutting are suitable.
Q13. Is NAXTRA 70 impact tested at low temperatures?
Yes, generally tested at –40°C as per EN 10025-6 standards.
Q14. Is it available in pre-cut sizes?
Yes, Champak Industries offers custom cutting and profiling.
Q15. What’s the delivery timeline for NAXTRA 70 exports?
Typically ready stock is dispatched in 2–4 working days, export shipping in 7–14 days depending on location.
