Q345R Steel Plate for Pressure Vessels (GB/T 713)
Q345R Steel Plate Overview
Q345R Steel Plate is a carbon–manganese pressure vessel steel manufactured in accordance with GB/T 713. It is specifically designed for boilers, pressure vessels, and pressure-retaining equipment where material reliability, weldability, and operational safety are critical.
Compared with ordinary structural steel, Q345R steel plate offers more stable mechanical properties, controlled chemical composition, and improved weldability, reducing the risk of brittle fracture under specified service conditions.
I. Q345R is the core pressure vessel steel plate in the Chinese national standard (GB) system, currently standardized as GB/T 713.2-2023. Based on a yield strength of 345MPa, it combines high strength, high toughness, excellent fatigue resistance, impact resistance, and good cold working and welding properties, making it an ideal material for manufacturing medium and low-pressure vessels.
II. Our Core Advantages and Professional Services
**Professional Technical Support, Ensuring Perfect Results**
**Comprehensive Knowledge Base:** Our sales team is proficient in mainstream domestic and international pressure vessel standards. Whether it's the Chinese national standard Q345R, the American ASME standard SA516GR70, or the European standard P355GH, we can provide accurate technical communication.
**Zero Communication Errors:** With solid product knowledge, we can avoid all basic errors during the order technical condition confirmation stage, ensuring the accuracy of your order.**Flexible Customization Capabilities, Meeting Special Needs**
**Standard and Non-Standard:** The Q345R standard does not have mandatory requirements for hardness and high-temperature performance. If your design has such special requirements (e.g., specific hardness, high-temperature mechanical properties, simulated post-weld heat treatment, HIC/SSC hydrogen-induced cracking resistance test, etc.), we support customized production.
**Fast Delivery:** Delivery time is one of our strengths.
**Hot-rolled Products:** Approximately 15 days
**Normalized and Heat-treated Products:** Approximately 30 days
**Precise Weighing Methods, Compliant with National Standards**
We strictly adhere to GB/T standards. The 713 standard differs from EN and ASME standards in its weighing method. We adhere to Class B tolerances in GB/T 709-2016, accurately adding a thickness surcharge to the theoretical weight to ensure fair and compliant settlement and avoid commercial disputes.
III. Stock Resources and Specifications
We have ample stock in various specifications and support custom cutting:
Applications of Q345R Pressure Vessel Steel
Boilers and boiler drums
Pressure vessels and reactors
Heat exchangers and condensers
LPG storage tanks and pressure cylinders
Industrial gas storage and processing equipment
Pressure-retaining shells, heads, and nozzles
Q345R Steel Plate Size Range and Supply Condition
Medium-Thick Plates (Hot Rolled)
| Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|
| 6–36 | 1800 / 2000 / 2200 / 2500 | 1100–12500 |
Medium-Thick Plates (Normalized Heat Treated)
| Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|
| 12–120 | 2000 / 2200 / 2500 | 1100–12500 |
Hot-Rolled Coils
| Thickness (mm) | Width (mm) |
|---|---|
| 5–16 | 1500 / 1800 / 2000 |
Supply Condition: Hot Rolled (HR), Normalized Rolling (NR), Normalized (N), Normalized + Tempered (N+T)
Chemical Composition of Q345R Steel Plate
| C | Si | Mn | Cu | Ni | Cr | Mo | Nb | V | Ti | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ≤0.20 | ≤0.55 | 1.20–1.70 | ≤0.30 | ≤0.30 | ≤0.30 | ≤0.08 | ≤0.050 | ≤0.050 | ≤0.030 | ≤0.025 | ≤0.010 |
Mechanical Properties and Impact Test Requirements
| Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test (0 °C) |
|---|---|---|---|---|
| 3–16 | ≥345 | 510–640 | 21 | ≥34 J |
| >16–36 | ≥325 | 500–630 | 21 | ≥34 J |
| >36–60 | ≥315 | 490–620 | 21 | ≥34 J |
Q345R vs SA516Gr70 vs P355GH – Impact Test Comparison
| Item | Q345R | SA516G70 | P355GH |
|---|---|---|---|
| Material Standard | GB/T 713 | ASTM A516 / ASME SA-516 | EN 10028-2 |
| Impact Test Mandatory | Yes | No (Project dependent) | Yes |
| Specified Test Temperature | 0 °C | Not specified | 0 °C |
| Average Impact Energy | ≥34 J | Project specified | ≥40 J |
| Minimum Single Value | ≥27 J | Project specified | ≥27 J |
Quality Control and Inspection
Mill Test Certificate (EN 10204 3.1)
Chemical composition analysis
Mechanical property testing
Charpy V-Notch impact testing
Ultrasonic testing (UT) upon request
Third-party inspection available
FAQ – Q345R Steel Plate
What is Q345R steel plate used for?
Q345R steel plate is mainly used for boilers, pressure vessels, heat exchangers, reactors, and other pressure-retaining equipment manufactured according to GB/T 713.
Is Q345R equivalent to SA516 Grade 70?
Q345R is not officially equivalent to SA516 Grade 70. Substitution requires design approval and compliance with applicable pressure vessel codes.
Can Q345R be used for low-temperature applications?
Q345R is suitable for normal to moderate low-temperature service. For cryogenic applications, steels such as 16MnDR or 09MnNiDR are recommended.
Does Q345R steel plate require impact testing?
Yes. Impact testing is a mandatory requirement under GB/T 713 for Q345R pressure vessel steel plates.
Can you provide Q345R steel plates with custom sizes?
Yes. We can provide customized Q345R steel plate services according to your actual required dimensions. Custom rolling of steel plates is one of our company's strengths. Maximum thickness can reach 140mm, maximum width can reach 5400mm, and maximum length can reach 15000mm. Delivery time: 10-15 days for hot-rolled steel, 30-35 days for normalized steel.