TUBE SQUARE

Tianjin Lefin Industrial Co., Ltd is one of the most experienced manufacturers and suppliers of tube square in China. Please feel free to buy high quality tube square from our factory. Good service and reasonable price are available.

Tube Square also we can call Square pipe Square pipe, Cold Formed Square Hollow Sections.

Square tube can be used for a wide variety of applications in industry, construction,high-rise buliding furniture, equipment ship build and agricultural industry. You can use both static and dynamic.

Available sizes between 19 x 19 mm and 300 x 300 mm, up to 1200X1200mm thicknesses between 1.5 and 16mm up to 60mm

Length can be customized.
Surface: Self color,

               Painted,

               Galvanized,

               FBE coated,

Technical features square tube:

Delivery Standards as:
EN 10210,
EN 10219,
ASTM A500,

AS 1163,

JIS G3466,

Should you have any inquires,pls feel free to contact with us!
Elva
Mob/Wechat/Whatsapp:008615122519420
Email:elvazhao@lefinsteel.com

1. Appearance inspection
During the appearance inspection, the surface of the square rectangular pipe needs to be carefully observed to check whether there are obvious depressions, bulges, wrinkles, wear or cracks, etc., to ensure that the surface of the pipe body is smooth and does not affect its use.

2. Dimensional inspection

When performing dimensional inspection, you need to use measuring tools such as rulers and calipers to measure the length, width, height and wall thickness of the square tube to check whether it meets the specified standards and ensure that it is not restricted by size when used.

(1) Steel pipe wall thickness inspection: micrometer, ultrasonic thickness gauge, no less than 8 points at both ends and record.
(2) Steel pipe outer diameter and ovality inspection: calliper gauges, vernier calipers, and ring gauges to measure large and small points.
(3) Steel pipe length inspection: steel tape, manual, automatic length measurement.
(4) Inspection of bending degree of steel pipe: ruler, level ruler (1m), feeler gauge, and thin line to measure bending degree per meter and full length bending degree.

(5) Inspection of Radius

3. Incision inspection
For the incisions of galvanized square and rectangular tubes, it is necessary to check whether they are flat and smooth, and there must be no burrs, cracks or peeling, etc. to ensure that the quality of the incisions can affect the service life of the square and rectangular pipes.

4. Weld inspection
When inspecting the welding process, it is necessary to observe whether the welds at the welding position are uniform and firm, as well as whether there are any bad marks, etc. to ensure that the welding quality meets the standard requirements and does not affect the use of square and rectangular pipes.

5. Zinc layer inspection (if galvanized type Tube Square) 
The outside of galvanized square and rectangular tubes is coated with a zinc layer, which needs to be inspected to determine the uniformity of the distribution of the zinc layer and whether the thickness of the zinc layer meets national standards to ensure the rust-proof and anti-corrosion properties of galvanized square and rectangular tubes.
 

To sum up, the inspection of galvanized square and rectangular tubes mainly includes appearance, size, incision, weld and zinc layer. Through inspection, the quality of galvanized square and rectangular tubes can be ensured and the safety of use can be ensured. At the same time, it is also recommended that users choose qualified manufacturers when purchasing square and rectangular tubes and request quality guarantee certificates to ensure that they purchase square and rectangular pipe products that meet the standards.