Contact Platform Support
Help CenterSquare Steel & SHS Square Tube，Q235B / SS400、Q345B / Q355B、20#、45#
Related Products
-
Steel Channel & U Channel Bar，5#、6.3#、8#、10#、12.6#、14#、16#、18#、20#、25#、30#、40#NegotiableMOQ: 5 Metric Tons -
Steel Wire Rope & Prestressed Steel Strand / PC Strand，1720MPa、1860MPa、1960MPaNegotiableMOQ: 5 Metric Tons
-
Steel Round Bar & Hot Rolled Solid Round Bar，Q235B / A36 / S235JR、10#、20#、SAE1010、1020、35#、45#、C45、S45C、SAE1045、42CrMo / 42CrMo4、35CrMoNegotiableMOQ: 5 Metric Tons
-
Silicon Steel & Electrical Steel，35WW300, 50WW400, 50WW600, 50WW800, 65WW1300, 23QG085, 27QG100, 30QG120, 35QG135NegotiableMOQ: 5 Metric Tons
-
Steel Billet & Low Carbon Wire Rod Billet，Q235B, Q195, S235JR, 35#, 45#, C45, S45C, 40Cr, 42CrMo, GCr15NegotiableMOQ: 5 Metric Tons
1. Product Overview
Square steel tube is a kind of cold-formed hollow structural steel with square hollow cross-section. It is one of the most widely used structural profiles in steel structure and machinery industries. Featuring flat surface, high bending resistance, easy connection and neat appearance, square tubes can be cut, welded, bent, punched and hot-dip galvanized. Sufficient stock is available, delivery time: 5–7 days, shipped from Tianjin Port.
2. Product Classification & Features
2.1 ERW Welded Square Tube (Main Stream)
Standard: GB/T 6728, GB/T 6725Manufactured by high-frequency welding process. Advantages: cost-effective, full specifications, smooth surface and straightness. Widely used for factory frames, guardrails, supports and photovoltaic brackets.
2.2 Seamless Square Tube (High Strength Industrial Grade)
Formed by hot rolling and cold drawing without welding seam. Features high pressure resistance, no welding stress, high impact resistance and no cracking. Suitable for heavy-duty machinery, high-pressure structural parts and precision load-bearing frames.
2.3 Hot-Dip Galvanized Square Tube (Anti-Corrosion Grade)
Treated by hot-dip galvanizing process with uniform zinc coating. Excellent rust-proof and weather resistance, no need for painting. Ideal for outdoor projects, municipal works and long-term exposed steel structures.
3. Main Material Grades
Q235B / SS400: General purpose, good welding performance for common structures.
Q345B / Q355B: High strength low alloy steel for heavy-load and large-span structures.
20# / 45#: High-quality carbon steel for precision mechanical parts and equipment frames.
4. Specifications
Size range: 20×20mm – 600×600mm
Wall thickness: 0.8mm – 25mm
Standard length: 6m / 9m / 12m, customized cutting available
Surface quality: no cracks, no delamination, smooth weld and flat end face.
5. Executive Standards
GB/T 6728, GB/T 6725, ASTM A500, EN10219, JIS G3466.Mill test certificate and SGS third-party inspection are available.
6. Core Advantages
High bending strength, stable load-bearing capacity, easy installation and processing, high dimensional accuracy, optional anti-corrosion treatment, complete specifications and stable export supply.
7. Applications
Steel structure buildings, factory frames, municipal guardrails, photovoltaic supports, mechanical equipment frames, engineering structural parts, storage racks and construction decoration projects.
8. Packaging & Trade Terms
Packed with steel strips and waterproof film for sea transportation. Shipped from Tianjin Port. Lead time: 5–7 days for stock goods, 10–15 days for customized sizes. Payment: 30% TT advance, balance before shipment. Quality guaranteed with free return for defective products.
Send Inquiry to This Supplier
You May Also Like
-
Square Steel & Square Steel Tube，Q195, Q235B / S235JR, A500 Grade B、Q355B / S355JR, A500 Grade C、20#, 45#NegotiableMOQ: 5 Metric Tons
-
Steel Channel & Hot Rolled U Channel Steel，Q235B / A36 / S235JR、Q355B / A572 Gr50 / S355JR、Q390B, Q420BNegotiableMOQ: 5 Metric Tons
-
Steel Wire Rope & PC Strand，GB/T 5224, ASTM A416, EN 10138NegotiableMOQ: 5 Metric Tons
-
Steel Round Bar & Round Bar，10#、20#、35#、45#、Q195、Q215、20Cr、40Cr、20CrMo、35CrMo、42CrMoNegotiableMOQ: 5 Metric Tons
-
Silicon Steel & Silicon Steel Coil，30Q120、30Q130、27Q110、27Q120、35WW230、35WW250、35WW300、35WW360、35WW440NegotiableMOQ: 5 Metric Tons
-
Steel Billet & Mild Steel Billet，Q195、Q215、Q235、Q355、Q390、Q420、Q460、10#、20#、35#、45#NegotiableMOQ: 5 Metric Tons
-
Square Steel & Square Pipe / Square Tube，Q195、Q215、Q235B、Q355B/C/D/E、20#、45#、40CrNegotiableMOQ: 5 Metric Tons
-
Channel Steel & Steel Channel，5#、6.3#、8#、10#、12.6#、14#a/b、16#a/b、18#a/b、20#a/b、25#a/b/c、30#a/b/c、40#a/b/cNegotiableMOQ: 5 Metric Tons
-
Steel Wire Rope & Prestressed Steel Strand，1570MPa、1720MPa、1770MPa、1860MPa、1960MPa、2000MPa、2100MPa、LWRNegotiableMOQ: 5 Metric Tons
-
Steel Round Bar & Round Steel Bar，Q195、Q235B、Q355B、10#、20#、35#、45#、27SiMn、40Cr、42CrMo、20CrMnTiNegotiableMOQ: 5 Metric Tons
