Description: BBN steel is a well-known steel manufacturer and service provider in China, GB 713 Q345R steel is our superior product, we are favored by customers with high quality, competitive price and excellent service
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram
Chinese National Standard GB 713 | Pressure Vessel Steel | Q = Yield Strength, 345 = 345 MPa Min Yield, R = Pressure Vessel | Compared with Q345 (16Mn): stricter P/S control, higher tensile & elongation, mandatory toughness | The most widely used & highest-consumption pressure-vessel special steel
345 MPa Min YieldGrade name Q345R means 345 MPa minimum yield, delivering higher strength than general Q345 (16Mn) for thicker pressure parts.
Stricter P/S & Mandatory ToughnessPhosphorus and sulfur are limited more strictly than Q345 (16Mn), with mandatory toughness requirements for reliable low-temperature service.
Higher Tensile & ElongationImproved tensile strength and elongation over common low-alloy Q345, with good comprehensive mechanical and processing performance.
01Product Overview & Specifications
GB 713 Q345R is China's national GB 713 special pressure vessel steel plate with a minimum yield strength of 345 MPa. It possesses good comprehensive mechanical properties and processing performance. Compared with common low-alloy high-strength Q345 (16Mn), Q345R adopts stricter control for phosphorus and sulfur content, improved tensile strength, higher elongation and mandatory toughness requirements.
As the most widely used and highest-consumption special steel for pressure vessel manufacturing, Q345R is mainly applied for boilers and various pressure-bearing equipment.
Item
Specification Details
Steel Grade
GB 713 Q345R
Executive Standard
GB 713 — Steel plates for boilers and pressure vessels (China national standard)
Product Form
Steel Plate
Thickness Range
3mm – 150mm
Width Range
1500mm – 4000mm
Length Range
3000mm – 15000mmCustom available
MOQ
1 PC
Delivery Time
Promptly (Stock); Custom production: 10–40 working days
Stock Status
Available
Certification
MTC available, third-party inspection supported
Payment Terms
T/T, L/C At Sight
02Equivalent Steel Grades
Q345R is a dedicated boiler and pressure vessel steel of the China GB 713 standard. The grades below are industry-recognized approximate alternatives for reference; professional technical verification is required before engineering substitution.
Standard System
Approximate Alternative Grade
European EN Standard
P355GH
American ASTM Standard
ASTM A516 Gr70
Japanese JIS Standard
SPV355
Note: Equivalent grades are approximate matches for general pressure-vessel purpose; chemical limits, impact and heat-treatment conditions differ by standard. Verify the design code and project specification before cross-standard substitution.
03Chemical Composition
Chemical composition of GB 713 Q345R (heat / ladle analysis, max % unless noted). Stricter phosphorus and sulfur control than general Q345 (16Mn) ensures stable toughness and weldability.
Element
Max %
Element
Max % / Min %
C (Carbon)
0.20
Mn (Manganese)
1.20 – 1.60
Si (Silicon)
0.55
P (Phosphorus)
0.025
S (Sulfur)
0.015
Al (Aluminium, total min)
0.020
04Mechanical Properties
Yield strength and tensile strength of GB 713 Q345R vary according to plate thickness. Values below are minimum yield and the tensile range per thickness band.
345Yield (≤16mm)Min MPa
510–640Tensile StrengthMPa
3–150 mmThickness RangeFull range
Thickness (mm)
Yield Min (MPa)
Tensile (MPa)
> 3 – ≤ 16
345
510 – 640
> 16 – ≤ 36
325
500 – 630
> 36 – ≤ 60
315
490 – 620
> 60 – ≤ 100
305
480 – 610
> 100 – ≤ 150
285
470 – 600
> 150
265
by agreement
Note: Tensile strength decreases with thickness — 510–640 MPa (≤16mm), 500–630 MPa (>16–36mm), 490–620 MPa (>36–60mm), 480–610 MPa (>60–100mm), 470–600 MPa (>100–150mm). Product thickness range is 3–150mm per GB 713; the >150mm row follows the standard extension and is supplied by agreement. Elongation and low-temperature impact requirements follow GB 713 — confirm the exact grade and thickness with our technical team for your project.
05Typical Application Fields
GB 713 Q345R is the dominant material for manufacturing elevated-temperature boilers and various pressure vessels, widely used in petrochemical, energy and boiler industries.
Reactors
Pressure-bearing reactor shells and vessels for petrochemical and energy plant process systems.
Heat Exchangers
Shells, channel covers and tube sheets for heat exchangers and other thermal equipment.
Storage Tanks
Storage tanks and separators requiring reliable pressure-bearing and welded performance.
Separators & Equipment
Separators, headers and various pressure-bearing equipment components for boiler and vessel manufacturing.
06Supply & Service
We supply full-specification GB 713 Q345R pressure vessel steel plates with complete MTC documents, third-party inspection and customized processing.
1
Full-Size Stock
Q345R plates 3–150mm in stock, promptly shipped.
2
Custom Cutting
Precision cutting to your dimensions, 10–40 working days for custom production.
3
Quality Inspection
Third-party quality inspection and complete MTC documents supported.
4
Global Supply
Stable and reliable steel supply for boiler and pressure vessel manufacturers worldwide.
Full-specification GB 713 Q345R steel plates with complete official MTC documents
Third-party quality inspection and customized cutting service
Flexible delivery cycle with sufficient stock for global project procurement
Stable and reliable supply for boiler and pressure vessel manufacturers
Get Your GB 713 Q345R Quotation Now
Send us your thickness, width & length (or part drawings), quantity and processing requirements. We will reply with stock status, transparent price, delivery time and complete certification documents within 24 hours.
BBN Steel has established a complete set of production and supplier management system processes to ensure the improvement of product quality and better service to users.
Production Control
BBN Steel has established a complete production quality control process to ensure every link from research and development to mass production.
Supplier management
Our supplier selection will consider factors such as health and safety, ethics, environmental protection, price and quality to better serve customers.
Certification & Patent
We have successively won various international authoritative certifications, GB /T19001-ISO9001: 2000 quality management system was implemented.
After sales service
We provide booking space, shipping tracking service and after-sales service, we will always be first-class products and perfect pre-sale and after-sales service.
Get in Touch
Welcome to contact us through online consulting, emails and hotline if you are interested in our company or products. Our staff will reply you within 24 hours.
Address: HIGH-TECH DEVELOPMENT ZONE, ZHENGZHOU, CHINA
