Carbon Steel Square Tube
Flexible Shape Options – Square tubes include both square and rectangular profiles, offering versatile solutions for applications that require equal or unequal side lengths.
Efficient and Reliable Production Process – Manufactured from processed steel strips that are flattened, welded into round tubes, and then shaped into squares, the production ensures consistent quality and accurate dimensions.
Multiple Manufacturing Methods – Available in hot-rolled seamless, cold-drawn seamless, extruded seamless, and welded varieties, square tubes can be tailored to different performance requirements and industrial uses.
Customizable Lengths for Practical Use – After shaping, the tubes can be cut to the required sizes, providing flexibility to meet specific project demands and reducing the need for additional processing.
Square tube is a general term for square and rectangular tubes, meaning steel tubes with equal or unequal side lengths. It's made by processing steel strips into coils. Generally, the strips are unpacked, flattened, coiled, and welded to form round tubes. These round tubes are then rolled into square tubes and cut to the required length.
Square tubes are categorized by production process: hot-rolled seamless square tubes, cold-drawn seamless square tubes, extruded seamless square tubes, and welded square tubes.
Square tubes are categorized by material: plain carbon steel square tubes and low-alloy square tubes.
1. Plain carbon steel is categorized into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.
2. Low-alloy steel is categorized into: Q345, 16Mn, Q390, ST52-3, etc.
Square tubes are categorized by cross-sectional shape:
Simple cross-section square tubes: square square tubes and rectangular square tubes.
Square tubes with complex cross-sections: flower-shaped square tubes, open-shaped square tubes, corrugated square tubes, and special-shaped square tubes.
Grade | Level | Chemical composition,% | Deoxygenation method | ||||
C | Mn | Si | S | P | |||
No greater than | |||||||
Q195 | - | 0.06~0.12 | 0.25~0.50 | 0.30 | 0.050 | 0.045 | F、b、Z |
Q215 | A | 0.09~0.15 | 0.25~0.55 | 0.30 | 0.050 | 0.045 | F、b、Z |
B | 0.045 | ||||||
Q235 | A | 0.14~0. 22 | 0.30~0.65 | 0.30 | 0.050 | 0.045 | F、b、Z |
B | 0.12~0.20 | 0.30~0.70 | 0.045 | ||||
C | ≤ 0.18 | 0.35~0.80 | 0.040 | 0.040 | Z | ||
D | ≤ 0.17 | 0.035 | 0.035 | TZ | |||
Q255 | A | 0.18~0.28 | 0.40~0.70 | 0.30 | 0.050 | 0.045 | F、b、Z |
B | 0.045 | ||||||
Q275 | - | 0.28~0.38 | 0.50~0.80 | 0.35 | 0.050 | 0.045 | b、Z |
Carbon steel pipes can be simply divided into: low carbon steel pipes, medium carbon steel pipes, high carbon steel pipes; hot rolled steel pipes, cold rolled steel pipes; welded steel pipes, straight seam steel pipes, etc. Carbon steel pipes are generally used in fire protection systems, shipbuilding, construction, machinery, oil and natural gas transportation
