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Help CenterHeavy Duty Carbon Steel Plate Q235B S355JR Used for Shipbuilding and Offshore Platform Construction
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Hemaokang Steel (Shandong) Co., Ltd. is proud to present our Heavy Duty Carbon Steel Plate Q235B S355JR, specifically engineered for the demanding environments of shipbuilding and offshore platform construction. As a newly established enterprise in 2025, we have rapidly built a reputation for supplying high-quality steel plates that meet rigorous international standards. Our plates are manufactured with precision, offering exceptional strength, durability, and weldability, making them ideal for structural components in marine and offshore applications. With an annual export value exceeding US$50 million, we serve a global clientele across North America, Europe, Asia, and beyond, ensuring that every shipment reflects our commitment to excellence.
This product is designed to withstand extreme conditions, including high-pressure loads, corrosive seawater, and dynamic forces encountered in marine environments. Whether you are constructing a bulk carrier, an oil tanker, a drilling rig, or a fixed platform, our Q235B and S355JR steel plates provide the mechanical properties required for long-term reliability. Below, we delve into the detailed specifications and advantages of this heavy-duty steel plate.
Key Features & Technical Specifications
- Superior Strength: Q235B offers a minimum yield strength of 235 MPa, while S355JR provides 355 MPa, ensuring robust structural integrity.
- Excellent Weldability: Low carbon content and controlled chemical composition facilitate easy welding without preheating in most cases.
- High Toughness: Suitable for low-temperature service, with Charpy V-notch impact test available upon request (e.g., 27J at -20°C for S355JR).
- Corrosion Resistance: Can be supplied with surface treatments such as pickling, oiling, or galvanizing to enhance resistance to marine environments.
- Dimensional Accuracy: Manufactured to tight tolerances (EN 10029 Class A or B) for consistent fit and easy fabrication.
- Customizable Sizes: Thickness from 6mm to 200mm, width up to 4000mm, length up to 12000mm, with additional options upon request.
- Certified Quality: ISO9001:2015 certified production process ensures traceability and consistent quality.
| Parameter | Q235B (GB/T 700) | S355JR (EN 10025-2) |
|---|---|---|
| Yield Strength (min) | 235 MPa | 355 MPa |
| Tensile Strength | 370-500 MPa | 470-630 MPa |
| Elongation (min) | 26% | 22% |
| Carbon Equivalent (CEV) | ≤0.44% | ≤0.45% |
| Impact Test (optional) | Not required by standard | 27J at -20°C (typical) |
Applications in Shipbuilding and Offshore Platforms
The heavy-duty carbon steel plate Q235B and S355JR are widely used in the following structural components:
- Hull Structures: Shell plates, bulkheads, and deck panels require high strength and fatigue resistance.
- Offshore Jackets and Decks: Legs, braces, and topside modules for fixed platforms and jack-up rigs.
- Piping and Storage Tanks: Pressure-containing components that demand toughness and weldability.
- Marine Equipment: Crane bases, mooring points, and support frames.
Why Choose Hemaokang Steel?
At Hemaokang Steel (Shandong) Co., Ltd., we combine a young, dynamic team with extensive industry experience. Our factory is equipped with advanced production lines, and we maintain strict quality control from raw material inspection to final shipment. With a workforce of 51-100 dedicated employees, we ensure personalized service and fast response times. Our ISO9001 certification guarantees a systematic approach to quality management, while our global logistics network enables timely delivery to any port worldwide.
We have successfully supplied steel plates for projects in shipyards across Europe, the Middle East, and Southeast Asia. Our annual export value of US$50 million to US$100 million reflects the trust our customers place in our products. Whether you require standard sizes or custom dimensions, we are ready to fulfill your order with competitive pricing and reliable lead times.
Contact us today to discuss your specific requirements. Our technical team can provide advice on grade selection, surface treatment, and additional processing such as flame cutting, drilling, or bending. Let Hemaokang Steel be your partner for durable, high-performance steel plates.
Frequently Asked Questions (FAQ)
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What is the difference between Q235B and S355JR?
Q235B is a Chinese standard grade with a minimum yield strength of 235 MPa, suitable for general structural use. S355JR is a European standard grade with higher yield strength (355 MPa) and better toughness, often preferred for offshore structures requiring lower temperature impact resistance. -
Can these plates be used for offshore drilling platforms?
Yes, both grades are suitable for offshore platforms when properly designed. S355JR is commonly used for primary structural members due to its higher strength and impact properties. Additional certification (e.g., DNV, ABS, Lloyd's) can be arranged upon request. -
What surface treatments are available?
Standard options include black (as-rolled), pickled and oiled, or shot-blasted and primed. Galvanizing is also available upon request for corrosion protection. -
Do you provide third-party inspection?
Absolutely. We can arrange inspection by SGS, BV, or other independent agencies at the buyer's request. Our ISO9001 system also supports internal quality checks. -
What is the minimum order quantity (MOQ)?
For standard sizes, MOQ is typically 25 metric tons per size. Custom sizes may have higher MOQ depending on the production setup. We are flexible for trial orders. -
How long does delivery take?
Delivery time depends on the quantity and specifications. For standard plates, it is usually 15-25 days after deposit. Custom orders may require 30-45 days. We work closely with logistics to ensure timely shipment. -
Can you provide material certificates?
Yes, a mill test certificate (MTC) according to EN 10204 Type 3.1 or 3.2 (if required) is provided with each shipment. -
Are these plates suitable for welding with common methods?
Yes, both Q235B and S355JR have good weldability using SMAW, GMAW, SAW, etc. Preheating is generally not required for thicknesses up to 40mm, but we recommend consulting your welding procedure for thicker sections.
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