Description: BBN steel is a well-known steel manufacturer and service provider in China, Q235B steel plate,GB/T700 Q235B carbon structure steel plate is our superior product, we are favored by customers with high quality, competitive price and excellent service
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Yield Strength 235 MPa (≤16mm), stepping down to 185 MPa by thickness | Tensile 370–500 MPa | A36 / SS400 / S235JR Equivalent | EN 10204 3.1/3.2 MTC & Multi-standard UT
Carbon Structural SteelQ235B per GB/T 700 — the most widely used carbon structural steel for welded structures, general fabrication and construction.
Thickness-based StrengthYield 235 MPa for thin plates, stepping down to 185 MPa for heavy plates; tensile fixed at 370–500 MPa across all thicknesses.
Verified QualityEN 10204 3.1/3.2 mill certificates and UT to GB/T2970, JB4730, EN 10160, ASTM A435/A577/A578 on request.
01Product Overview & Execution Standards
GB/T 700 Q235B is a carbon structural steel manufactured per the Chinese national standard GB/T 700. As a professional manufacturer and exporter, we supply Q235B steel plates and coils for welded structures, general engineering fabrication, building construction and machinery manufacturing worldwide.
Q235B delivers a yield strength of 235 MPa (for plates ≤16mm, stepping down with thickness) and a fixed tensile range of 370–500 MPa, with a room-temperature (20°C) V-notch impact requirement for Grade B. It is the Chinese equivalent of ASTM A36, JIS SS400 and EN 10025-2 S235JR, enabling flexible material replacement for cross-standard projects.
Item
Specification Details
Steel Grade
GB/T 700 Q235B
Executive Standard
GB/T 700 (China); ASTM, JIS, EN, DIN, BS also applicable
Steel Category
Carbon Structural Steel
Product Types
Steel Plate, Steel Coil (sections & profiles on request)
Welded structures, building & construction, machinery, general fabrication
Lead Time
Stock & custom; confirmed per inquiry and order quantity
Custom Service
Cutting, welding and processing per client drawings
02Mechanical Properties
Per GB/T 700, Q235B yield strength decreases with increasing plate thickness, while the tensile strength remains a fixed 370–500 MPa band for every thickness specification.
≥235 MPaYield (≤16mm)≈34 ksi
370–500 MPaTensile Strengthall thicknesses
20°CImpact TestGrade B requirement
185 MPaYield (>150mm)thick plate min
Steel Thickness (mm)
Min Yield Strength (MPa)
Tensile Strength (MPa)
≤16
235
370–500
>16 – ≤40
225
370–500
>40 – ≤60
215
370–500
>60 – ≤100
215
370–500
>100 – ≤150
195
370–500
>150
185
370–500
Note: Values are minimum yield strength per GB/T 700; the tensile range is a fixed band for all thickness specifications. A 20°C V-notch impact test applies to Grade B. For critical projects, confirm detailed requirements against the mill test certificate.
03Chemical Composition
Controlled carbon structural chemistry per GB/T 700 (heat analysis, maximum values) — low carbon for good weldability and formability.
Element
C
Si
Mn
P
S
Max % (Heat Analysis)
≤0.20
≤0.35
≤1.40
≤0.045
≤0.045
Note: Values are specified maxima (heat analysis) per GB/T 700. The low-carbon, moderate-manganese design gives Q235B excellent weldability and formability for structural fabrication, while strict element control is available for high-standard projects.
04Equivalent International Steel Grades
GB/T 700 Q235B corresponds to the following mainstream international grades, supporting flexible material substitution for global procurement and cross-standard construction.
Standard Region
Standard
Equivalent Grade
United States
ASTM A36
A36
Japan
JIS G3101
SS400
Europe
EN 10025-2
S235JR
China (same standard)
GB/T 700
Q235A (no impact test)
Q235B vs ASTM A36: Q235B yield is 235 MPa (≤16mm) vs A36 250 MPa; Q235B tensile 370–500 MPa vs A36 400–550 MPa. Both are general-purpose structural carbon steels with good weldability — select per project standard and impact requirements.
05Product Forms & Sizes
Q235B is supplied mainly as hot-rolled steel plate and coil, with section steel and profiles available on request.
01
Q235B Steel Plate
Hot-rolled carbon structural steel plate for welded structures, building frames, machinery bases and general fabrication. Covers a wide thickness range from thin gauge to heavy plate, with cut-to-size service available.
02
Q235B Steel Coil
Hot-rolled coil for continuous forming, welded tubes, roll-formed sections and general structural use. Can be cut to length or slit to strip per client requirement.
Typical sizes: plate thickness 6–300mm, width up to 3000–4500mm and length up to 12000mm (longer on request); coil thickness commonly 1.5–25mm. Exact sizes and tolerances are confirmed against mill capacity and your order.
06Quality Assurance & Service
From mill inspection to export — strict chemical control, custom processing, certified MTC and multi-standard UT for customers worldwide.
01
Custom Cutting & Welding
Cutting, edge preparation and welding processing per client drawings and technical requirements, including prefabricated parts and assemblies.
02
Strict Chemical Control
Strict control of chemical element composition during production, especially for high-standard projects with tighter element limits and full traceability.
03
Certified Mill Test Certificates
Official mill test certificates (MTC) issued in compliance with EN 10204 3.1 / 3.2, with full heat analysis and mechanical test records.
04
Multi-standard UT Inspection
Ultrasonic testing (UT) performed to customer-specified standards: GB/T2970, JB4730, EN 10160, ASTM A435, ASTM A577, ASTM A578.
Custom cutting and welding processing per client requirements
Strict control of chemical composition for high-standard projects
Mill test certificates per EN 10204 3.1 / 3.2
UT to GB/T2970 / JB4730 / EN 10160 / ASTM A435 / A577 / A578
Competitive factory price with fast and reliable global delivery
Technical support and factory visits welcome for customers worldwide
Get Your Q235B Steel Official Quotation
Send us your product type, size specification (or part drawings), quantity and processing requirements. We will reply with the latest stock status, competitive factory price and technical support within 24 hours. Customers from all over the world are welcome to visit our factory.
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
