Q345R Steel Plate: The Ultimate Pressure Vessel Material
Welcome to YUXIN Group – a leading certified supplier and exporter of high-performance Q345R steel plates in China. As the preferred material for pressure vessels, boilers, and petrochemical equipment, our Q345R plates offer superior weldability, high tensile strength, and excellent low-temperature impact toughness.
What is Q345R Steel Plate?
Q345R is a specialized grade of boiler and pressure vessel steel under Chinese Standard GB713. The "R" denotes "Pressure Vessel" (Rongqi). It is a low-alloy steel known for its exceptional resistance to high temperature and high-pressure environments.
While widely used as a cost-effective alternative to ASME SA516 Gr70, Q345R offers unique advantages in yield strength and corrosion resistance for thermal equipment.
Key Equivalent Grades:
China: Q345R (GB713)
International: SA516 Gr70 (ASTM), P355GH (EN), SPV355 (JIS).
Quality Assurance | Fully Certified & Traceable
One-stop steel procurement
Superior Weldability: Our Q345R features an ultra-low carbon equivalent (CEq ≤0.42), reducing or eliminating preheating needs and preventing cold cracks during pressure vessel fabrication.
Zero Internal Defects: Every plate undergoes 100% ultrasonic testing (UT) to ASTM A578 Level C standards, ensuring no laminations, inclusions, or hidden flaws.
True Normalized Structure: We supply genuine normalized Q345R (not as-rolled), guaranteeing uniform mechanical properties across full thickness and excellent low-temperature impact toughness at -20°C.
Q345R vs. Competitors (SA516 Gr70)
| Property | Q345R (China) | SA516 Gr70 (USA) |
|---|---|---|
| Yield Strength (MPa) | ≥345 (for 16mm thick) | ≥260 |
| Tensile Strength | 510-640 | 485-620 |
| Carbon Equivalent | Lower (Better weldability) | Higher |
| Price Point | Cost-effective | Premium |
| Availability | In stock (China mills) | Usually imported |
Applications: Where is Q345R Used?
Boilers
Steam drum and head parts.
Pressure Vessels
LPG tanks, reactors, and storage spheres.
Heat Exchangers
Shell plates for high-temperature transfer.
Petrochemical Plants
Refining towers and hydrocracking reactors.
why choose us?
Our mill-direct supply chain ensures you receive plates that meet stringent international standards. Here is why industry leaders trust our Q345R:
1. Superior Mechanical Properties
High Yield Strength: Ensures safety under extreme internal pressure.
Excellent Weldability: Low carbon equivalent (Ceq) prevents cold cracking during fabrication.
Impact Resistance: Stable performance even in low-temperature environments (0°C to -20°C).
2. Strict Quality Control
100% Ultrasonic Testing (UT) per GB/T 2970.
Third-party inspections allowed (SGS, BV, Lloyds).
Mill Test Certificate (MTC) provided with every shipment, tracing heat numbers.
3. Versatile Specifications
We offer customization to meet your unique project needs.
| Parameter | Details |
|---|---|
| Thickness | 6mm - 200mm |
| Width | 1500mm - 4000mm |
| Length | 6000mm - 18000mm (or as per request) |
| Heat Treatment | Normalized (N), As-rolled, or Tempered |
| Surface Finish | Black, shot blasting, or painted |
Get the quotation within 24 hours
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Global Export & Shipping
We are experienced in exporting Q345R plates to Southeast Asia, Middle East (UAE, Saudi), Africa, Europe, and South America.
Packaging: Export standard (water-proof paper + steel edge protection + steel bundling).
Lead Time: 7-15 days for stock items; 25-30 days for mill production.
Ports: Tianjin, Shanghai, Qingdao.
our Partners
We trusted by
User Evaluation
Project Manager,
Energy Equipment Co., Vietnam
Procurement Officer,
Saudi Arabia
Ahmed Al-Rashid
Procurement Manager, Dubai, UAE
FAQ
01.Is Q345R equivalent to A516 Gr70?
While not identical, Q345R is widely accepted as the Chinese equivalent to SA516 Gr70. Q345R generally has higher yield strength. We can provide a cross-certification if required.
02.Can you provide heat treatment?
03.Do you cut plates to size?
04.What payment terms do you accept?
TT (30% deposit + 70% copy of B/L) or Irrevocable L/C at sight.
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