BRISK STEEL FOCUS ON PRODUCE AND SUPPLY HOLLOW SECTION AND STEEL PIPE
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About UsBrisk Steel Group is a leading manufacturer and distributor of steel structures, steel tubes and pipes in diverse fields such as infrastructure and construction industry, machinery industry, new energy projects ect.
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ProductsIt is a large steel structural company from design, manufacturing to erection with the certificate of First Grade Qualification of Professional Contracting of Steel Structure.we are dedicated to manufacturing square, rectangular, circular hollow sections,weld steel pipe,GI pipe and LSAW Pipe for bridge and steel structural products like warehouse, automated parking system, electricity tower and ect. to satisfy customers' needs for different products.
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BLOGCustomers choose and trust us not only because of our stable quality but also pre-sales service and post-sales service along with the products. Each of our employee dealing with clients is a product expert, who will answer clients' questions professionally with great patience and provide clients with excellent customized solutions based on each client's requirement.
Add：Daqiuzhuang Industrial Area,Jinghai County,Tianjin,China
Tel：08618322290777
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BLACK SQUARE TUBE
- Commodity name： BLACK SQUARE TUBE
keyword：
Details
- 产品描述
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Common Standards for Black Square Tube
The most widely adopted standards in global trade include Chinese standard (GB/T 700 Q235B / Q355B), American standard (ASTM A500 Grade B/C), and European standard (EN 10219 S235JRH / S355J0H / S355J2H). These three grades cover most conventional industrial and civil usage scenarios.
Chemical Element Composition Comparison
- Chemical composition determines the weldability, corrosion resistance and processing performance of black square tubes. The key controlled elements include Carbon (C), Manganese (Mn), Phosphorus (P) and Sulfur (S); low P and S content ensures low impurity and stable steel quality.
Standard & Grade
Carbon (C) ≤
Manganese (Mn)
Phosphorus (P) ≤
Sulfur (S) ≤
Characteristic
GB Q235B
0.22%
0.30% - 1.40%
0.045%
0.045%
Balanced composition, good plasticity
ASTM A500 Gr.B
0.26%
0.70% - 1.10%
0.040%
0.040%
Strict impurity control
ASTM A500 Gr.C
0.20%
0.80% - 1.35%
0.040%
0.040%
Higher manganese for better strength
EN 10219 S235JRH
0.17%
0.40% - 1.20%
0.035%
0.035%
Low carbon, excellent weldability
EN 10219 S355J0H
0.22% 1.60% 0.035% 0.035% High strength, 0℃ impact resistance
EN 10219 S355J2H 0.22% 1.60% 0.030% 0.030% Low-temperature toughness (-20℃)
Physical & Mechanical Properties Comparison
- Physical mechanical properties are core indicators for engineering selection, including yield strength, tensile strength, elongation and hardness, which directly determine the bearing capacity and bending resistance of square tubes.
Standard & Grade
Yield Strength (MPa) ≥
Tensile Strength (MPa)
Elongation (%) ≥
Hardness (HRB)
Physical Advantage
GB Q235B
235
370 - 500
26
70 - 85
Easy cutting & bending
ASTM A500 Gr.B
290
400 - 550
21
75 - 88
High structural stability
ASTM A500 Gr.C
345
450 - 580
19
80 - 90
Ultra-high bearing strength
EN 10219 S235JRH
235
360 - 510
27
68 - 82
Tough & crack-resistant
EN 10219 S355J0H
355
470 – 630
20
85 - 95
High load capacity, 0℃ impact test
EN 10219 S355J2H
355
470 – 630
20
85 - 95
Excellent low-temperature (-20℃) toughness
Additional General Physical Parameters
- Density: 7.85 g/cm³ (universal for all carbon steel black square tubes)
- Surface Feature: Black oxide layer, no galvanized coating, anti-rust oil for protection
- Size Range: 10×10mm - 1200×1200mm; wall thickness 0.5mm - 50mm; customizable length (1-18m)
- Tolerance: Wall thickness tolerance ±8%~±10%, flat and smooth tube wall
Grade Selection Suggestion for Purchase
- General civil construction & low-load frame: Choose GB Q235B or EN S235JR, cost-effective and easy processing.
- European standard high-strength structure: Select EN S355J0H (0°C impact) and S355J2H (-20°C impact), ideal for cold region and heavy-duty engineering.
- American standard engineering & medium-load structure: Choose ASTM A500 Grade B, stable performance for export.
- Heavy-load mechanical support & high-strength framework: Choose ASTM A500 Grade C for higher yield strength.
Brisk Steel Factory
Core Advantage
Brisk Steel Group is rooted in a culture of "technology as the backbone, quality as the soul, and customers as the heart." Through relentless innovation, global expansion, and a commitment to responsibility, we strive to become a trusted global partner and a technological benchmark in the steel manufacturing industry.
Craftsmanship with Precision
We adhere to a rigorous quality control system that spans the entire production process—from raw material procurement and manufacturing to product delivery—ensuring the highest standards of excellence.
Innovation-Driven Technological Leadership
We prioritize R&D and technological advancement, integrating cutting-edge production lines (e.g., JCOE large-diameter LSAW pipe production) and expert teams from countries like Germany and the Netherlands to maintain our position at the forefront of the industry.
Globalization and Open Collaboration
Actively engaging in the global supply chain, we have obtained international certifications such as CE marking, enabling our products and services to reach worldwide markets.
Professional Team and Talent Empowerment
We value the recruitment and development of technical talent, building an international and professional team that drives continuous growth.
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