Products Specification
|
Material |
10#,20#,35#,45#,Q235,16Mn,etc. A106B,A53B, |
|
Wall thickness |
2.5~90 |
|
Length |
6m |
|
Standard |
ASTM A106B,A53B DIN ST44,ST35,ST37,ST52 |
|
Surface |
painted or oiled or galvanized or as request |
|
Out Diameter |
21.3~813 |
|
Packing |
In bundle or bulk |
Products Description
Steel pipe sizefor your reference
|
ID |
OD |
Inch |
Wall |
Theorectical |
Pieces |
Executive standard |
|
DN15 |
21.25 |
1/2 |
2.75 |
1.26 |
217 |
GB/T3091-2008 |
|
DN20 |
26.75 |
3/4 |
2.75 |
1.63 |
169 |
GB/T3091-2008 |
|
DN25 |
33.3 |
1 |
3.25 |
2.42 |
127 |
GB/T3091-2008 |
|
DN32 |
42.25 |
1.25 |
3.25 |
3.13 |
91 |
GB/T3091-2008 |
|
DN40 |
48 |
1.5 |
3.5 |
3.84 |
91 |
GB/T3091-2008 |
|
DN50 |
60 |
2 |
3.5 |
4.88 |
61 |
GB/T3091-2008 |
|
DN65 |
75.5 |
2.5 |
3.75 |
6.64 |
37 |
GB/T3091-2008 |
|
DN80 |
88.5 |
3'' |
4 |
8.34 |
37 |
GB/T3091-2008 |
|
DN100 |
114 |
4'' |
4 |
10.85 |
19 |
GB/T3091-2008 |
|
DN125 |
140 |
5'' |
4.5 |
15.04 |
19 |
GB/T3091-2008 |
|
DN150 |
165 |
6'' |
4.5 |
17.81 |
19 |
GB/T3091-2008 |
|
DN200 |
219 |
8'' |
6 |
31.52 |
7 |
GB/T3091-2008 |
Breaking Conventions Through Material Innovation
Q235B welded steel pipe is engineered through deep optimization of its base material. By adding trace alloying elements niobium (Nb) and vanadium (V), the steel's crystal structure is refined, increasing mechanical performance beyond conventional Q235 standards:
Yield Strength: improved from ≥235 MPa to above 270 MPa
Tensile Strength: increased by over 15%
Toughness: maintained at low temperatures, resisting impact at –20°C
Advanced Thermomechanical Controlled Processing (TMCP) further refines grain structure, achieving superior toughness and stable mechanical behavior even under demanding working conditions.
The surface features a nano zinc–aluminum coating, forming a dense barrier that offers twice the corrosion resistance of standard galvanizing, significantly extending service life in harsh environments.
Smart Manufacturing for Superior Quality
Q235B welded steel pipes are produced using a fully digitalized and intelligent manufacturing system:
Digital High-Frequency Welding
Rapid electromagnetic induction heating
Precision roller extrusion ensures full fusion of the weld seam
Welding speed reaches 30 meters/minute
Seam quality matches the mechanical strength of the base material
Intelligent Real-Time Inspection
Multispectral imaging detects surface defects as small as 0.1 mm
Ultrasonic phased-array testing identifies internal flaws from multiple angles
Full production data is uploaded to a cloud system for real-time customer monitoring
These technologies ensure consistent quality and traceable production for every batch.
Superior Performance for Complex Conditions
Q235B welded steel pipe is designed to perform reliably in various challenging environments:
Internal Pressure Resistance: up to 4.5 MPa, suitable for urban secondary water supply and industrial gas pipelines
Enhanced Bend Resistance: deformation under external force is 30% lower than conventional pipes
Corrosion Protection: nano zinc–aluminum coating maintains integrity in humid southern regions and sandy northwestern climates
Reduced Maintenance Costs: long-lasting surface protection minimizes long-term upkeep
Diverse Applications Across Industries
Construction
Ideal for scaffolding, formwork supports, and structural elements-combining high strength, safety, and cost performance.
Municipal Engineering
Used for drainage systems, cable protection pipes, and utility infrastructure. Nano coating ensures durable corrosion resistance against sewage, soil, and moisture.
Agriculture
Suitable for irrigation systems, greenhouse frames, and fertilization pipelines. Resistant to chemical erosion from pesticides and fertilizers.
Light Industry
Widely used in furniture manufacturing, fitness equipment, and mechanical frames due to easy processing and competitive price.
