Q235q to Q420q Bridge Steel Plate: Chinese Standard Structural Steel for Bridge Construction

Overview

Q235q, Q345q, Q370q, and Q420q bridge steel plates are high-performance structural steels designed for bridge engineering applications. These plates follow China’s GB/T 714 standard, featuring excellent strength, weldability, and low-temperature toughness, making them ideal for various types of highway and railway bridge structures.

At CJM, we offer a complete range of bridge steel grades, available in multiple thicknesses and widths, with fast delivery and mill certification. Our large inventory and export expertise ensure global customers receive reliable steel solutions tailored for critical infrastructure projects.

Common Grades & Designations

• Q235qC / Q235qD
• Q345qC / Q345qD / Q345qE
• Q370qD
• Q420qD / Q420qE

Each grade is available in Z-direction (Z15, Z25, Z35) upon request for enhanced lamellar tearing resistance.

Product Size Range

Specification	Range
Thickness	6 mm – 120 mm
Width	1500 mm – 3200 mm
Length	6000 mm – 18000 mm
Delivery Condition	Hot Rolled, Normalized, TMCP
Standard	GB/T 714

Chemical Composition (Typical, %)

Grade	C	Si	Mn	P (max)	S (max)
Q235qC	≤0.20	≤0.35	0.35–0.80	0.035	0.035
Q345qD	≤0.20	≤0.50	1.00–1.60	0.030	0.030
Q370qD	≤0.22	≤0.55	1.10–1.70	0.030	0.030
Q420qE	≤0.22	≤0.60	1.30–1.80	0.025	0.025

Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Test
Q235qC	≥235	370–500	≥22	–
Q345qD	≥345	470–630	≥20	-20°C
Q370qD	≥370	490–660	≥18	-20°C
Q420qE	≥420	570–720	≥17	-40°C

Note: Impact test values refer to Charpy V-notch transverse samples.

Typical Applications

• Highway and railway bridge decks
• Main girders, arches, and trusses
• Cantilever and suspension bridge sections
• Steel box girders and longitudinal stiffeners
• Bridge towers and substructures

Why Choose Our Bridge Steel Plate & Coil?

1. Customization: We offer customized sizes and specific steel grades tailored to meet the unique demands of your project.
2. High Quality: Our products adhere to strict international standards, ensuring exceptional quality and performance.
3. Global Delivery: With efficient logistics, we deliver to key markets across Southeast Asia, Middle East, Africa, Europe, America, and India.

Packaging & Shipping for Bridge Steel Plate & Coil

We understand that the safe and secure delivery of your Bridge Steel Plates and Bridge Steel Coils is crucial. To ensure your products arrive in perfect condition, we use durable and industry-standard packaging methods that protect them during transport.

• Packaging Options:
  • Steel plates are carefully wrapped and packed with protective materials to avoid damage during handling.
  • Steel coils are securely strapped and wrapped in heavy-duty plastic or corrosion-resistant material to ensure they are protected from environmental factors during transit.
• Packaging Features:
  • Waterproof Wrapping: To protect against moisture and corrosion.
  • Reinforced Pallets: For easy handling and to prevent deformation.
  • Custom Packaging: Tailored packaging solutions are available for specific needs, ensuring optimal protection.

CJM offers fast and efficient shipping to major international markets, and work with trusted logistics partners to guarantee timely delivery and minimize any risk of delay. Our dedicated support team is available to answer any shipping-related inquiries.

Shipping time and cost depend on your location and the order volume. Please contact us for detailed quotes and estimated delivery times for your specific project.

Ready to Start Your Project?

Contact us today for more information on our Bridge Steel Plate and Bridge Steel Coil solutions. We offer competitive pricing and tailored support to meet your project’s specific requirements.

Q: What is your company’s main products/services?

A: We are a professional manufacturer for Carbon Steel, Alloy Steel and Profile products. We have the experience of steel business for more than 10 years and our products are exported to Mid East,South America,Southeast Asia,Africa,South and East Asia etc.

Q: Can I go to your factory for a visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What are your terms of payment?

A: 30% T/T deposite and 70% balance before shipment.

Q: What is your delivery time?

A: For stocks,we could transport the goods to loading port within 7 days after we received the deposit; For production,it usually takes about 15-30 days after receiving the deposit.

Q: Do you provide samples? Are they free or paid?

A: Samples are available for free,but the courier freight will be covered by customer account.

Q: Do you accept the third party inspection?

A:Yes, we fully accept ‌third-party inspections.

Q: Why should I buy from you not from other suppliers?

A: Integrating the superior resources of China’s steel industry, we provide customers with high-quality steel products at preferential prices, and can ensure that the goods are delivered to customers in a timely manner.

Q:How can you guarantee quality?

A: Always a pre-production sample before mass production;Always 100% inspected before shipment