15mm*1.77kg/m square bar for construction

15mm*1.77kg/m square bar for construction System 1

15mm*1.77kg/m square bar for construction

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 100000 m.t./month

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Product Description:

Hollow Section-Square Tubes

Application:

It is widely used in building, machine, chemical equipment, automobile industrial, container, it is also applied to agriculture and mine machine.

Standard：

ASTM A500, GB6728

Steel grade:

ASTM A500: A, B, C

GB6728：Q195，Q215，Q235，Q345

Size of Pipe:

*Remark: Besides below sizes, we also can arrange production based on requirement of customers

SIZE(mm)	THICKNESS(mm)
10×10	0.6-1.0
12×12	0.6-1.0
16×16	0.6-1.2
19×19	0.6-1.5
20×20	1.6-1.5
25×25	1.0-2.75
30×30	1.0-2.75
32×32	1.0-3.0
38×38	1.0-3.0
40×40	1.0-3.5
50×50	1.0-5.0
60×60	1.0-6.0
63.5×63.5	1.0-6.0
70×70	1.5-6.0
75×75	1.5-6.0
80×80	2.0-6.0
90×90	2.0-6.0
100×100	2.3-6.0
120×120	4.0-6.0
125×125	4.0-6.0
150×150	4.0-8.0
200×200	6.0-12
250×250	6.0-12
300×300	6.0-12
400×400	6.0-12

Standard: ASTM A500

Chemical Composition(%)

Chemical Requirement
	Composition %
	Grade A		Grade B
	Heat	Product	Heat	Product
Element	analysis	analysis	analysis	analysis
Carbon max	0.26	0.3	0.22	0.26
Manganese max	…	…	1.4	1.45
Phosphorus, max	0.035	0.045	0.03	0.04
Sulfur max	0.035	0.045	0.02	0.03
Where an ellipsis (...)appears in this table, there is no requirement
For each reduction of 0.01 percentage point below the specified maximum for carton, and increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.6% by product analysis

Mechanical Properties

Tensile Requirement
	Grade A	Grade B
Tensile strength, min, psi (Mpa)	48000 (400)	70000 (483)
Yield strength, min, psi (Mpa)	36000 (250)	50000 (345)
Elongation in 2 in. (50.8mm), min, %	23	23

GB6728：

Steel Grade

CHEMICAL COMPOSITION

MECHANICAL PROPERTIES

C (%)

Si (%)

(%)

P(%)

Max

S (%)

Max

YS(Mpa)

Min

TS(Mpa)

Min

El (%)

Min

Q195

0.06-0.012

0.3

0.25-0.5

0.45

0.5

195

315

Q215

0.09-0.15

0.3

0.25-0.55

0.45

0.5

215

335

Q235

0.12-0.22

0.3

0.3-0.7

0.45

235

375

Q345

0.20

0.55

1.0-1.6

0.45

345

510

producing of Hollow Section-Square Tubes

Square Welded Hollo Sectio/Welded Rectangle Hollow Section

delivery of Hollow Section-Square Tubes

Q:How do you use a steel square to measure and mark 120-degree angles?: To accurately measure and mark 120-degree angles using a steel square, you can follow the following instructions: 1. Familiarize yourself with the markings on the steel square. Typically, a steel square consists of two arms that meet at a right angle, creating an "L" shape. One arm, known as the blade, is longer than the other arm, called the tongue. Each arm is divided into sections, usually in inches on one side and centimeters on the other. 2. Identify the 90-degree angle on the steel square. This is where the blade and tongue intersect, serving as a reference point for measuring other angles. 3. Position the steel square on the material or surface you want to mark. Ensure that the blade is aligned with one side of the material, forming a perpendicular angle. 4. Rotate the steel square until the tongue aligns with the opposite side of the material. This creates a 90-degree angle between the blade and tongue. 5. To measure and mark a 120-degree angle, you need to further rotate the steel square. Begin by rotating the square in a clockwise direction while maintaining alignment between the blade and the first side of the material. 6. Continue rotating the steel square until the tongue lines up with a marking on the blade that indicates 30 degrees. This will result in a 120-degree angle between the blade and tongue. 7. Once you have correctly aligned the steel square to measure a 120-degree angle, use a pencil or pen to mark the desired point on the material. By following these steps meticulously, you can effectively utilize a steel square to accurately measure and mark 120-degree angles. Remember to recheck your measurements and ensure that the square remains securely in place during the marking process to achieve precise outcomes.

Q:How do you use a steel square to lay out a pyramid shape?: To use a steel square to lay out a pyramid shape, you would follow these steps: 1. Determine the desired dimensions of the base of the pyramid and mark these measurements on the ground or work surface. 2. Place the steel square at one corner of the base and align one edge of the square with the edge of the base. 3. Extend the other leg of the square vertically upwards, keeping it perpendicular to the base. This will mark the height or apex of the pyramid. 4. Measure and mark the same distance along the adjacent side of the base, and then connect this point with the apex mark using a straightedge or a string. 5. Repeat the previous step for the remaining sides of the base, connecting each corner with the apex mark. 6. Once all four sides are marked, connect the corresponding marks on each side to complete the pyramid shape. By using a steel square, you can ensure that the pyramid's base and sides are accurately laid out at right angles to each other, resulting in a properly proportioned pyramid shape.

Q:How do you use a steel square for creating precise spline joints?: To use a steel square for creating precise spline joints, first, measure and mark the desired length on both pieces of wood. Then, align the steel square against the edge of the wood, ensuring it is perpendicular to the surface. Next, draw a line along the edge of the steel square using a pencil or a marking knife. Repeat this process on both pieces of wood. Finally, align the marked lines and cut along them to create precise spline joints.

Q:The steel and wood preservative in the flower is how to connect: Or with the aid of angle steel, angle steel and steel welding, wood preservative and angle connected by bolts.

Q:Can a steel square be used for measuring curved surfaces?: A steel square is not capable of measuring curved surfaces. It is specifically designed for measuring and marking straight lines and right angles. It is composed of a long blade and a shorter tongue that are perpendicular to one another. The straight edges of a steel square make it perfect for tasks like checking corner squareness or marking 90-degree angles. However, its inflexible shape renders it unsuitable for measuring or marking curved surfaces. To measure curves, it would be more suitable to use flexible measuring tools like a flexible tape measure or a contour gauge.

Q:Can a steel square be used for checking the plumbness of poles?: No, a steel square cannot be used for checking the plumbness of poles. A steel square is primarily used for measuring right angles and making straight cuts, whereas checking plumbness requires a level or plumb bob to determine vertical alignment accurately.

Q:How do you use a steel square to determine the angle of a drum sanding cut?: To use a steel square to determine the angle of a drum sanding cut, you will need to follow these steps: 1. Start by setting up the steel square on a flat surface, ensuring that it is perpendicular to the edge of the table or workbench. 2. Place the drum sander on the table, aligning it with the edge of the steel square. 3. Adjust the angle of the drum sander by rotating it until it is parallel to one of the edges of the steel square. 4. Once the drum sander is aligned parallel to the edge of the steel square, measure the angle between the steel square and the drum sander using a protractor or an angle measuring tool. 5. Take note of the angle measurement, as this will be the angle at which you need to set your drum sander for the desired cut. 6. Use the angle measurement to adjust the drum sander accordingly, either by adjusting the table tilt or by using any angle adjustment features available on your specific drum sander model. 7. Double-check the angle by placing the steel square back on the table and aligning it with the drum sander. Ensure that the drum sander is parallel to the edge of the steel square. 8. Once you are confident that the drum sander is set at the desired angle, you can proceed with making your drum sanding cut. It is important to note that using a steel square to determine the angle of a drum sanding cut provides a rough estimate and may not be as accurate as using specialized angle measuring tools. However, it can still be a useful technique for achieving reasonably accurate results in many woodworking tasks.

Q:Can a steel square be used for marking and scribing?: Certainly, a steel square is an excellent tool for marking and scribing purposes. Known as combination squares, these versatile tools are widely used in woodworking, metalworking, and construction. Typically, they consist of a ruler-like blade equipped with a sliding head that can be securely locked at different angles. The steel blade of the square is precisely marked with measurements, enabling accurate marking and layout of lines on a workpiece. These markings serve various purposes, including cutting, drilling, and joining pieces together. Furthermore, the sliding head can be adjusted to different angles, making it valuable for creating angled lines or determining squareness. In addition to marking, a steel square can also be utilized for scribing. Scribing involves drawing a line on a surface that follows the contour or edge of another object. This proves particularly useful when fitting pieces together or transferring measurements from one surface to another. The durability and rigidity of a steel square render it an ideal tool for precise marking and scribing tasks. Its steel construction ensures long-lasting accuracy and reliability, even in demanding work environments. Therefore, a steel square is an indispensable tool for craftsmen and DIY enthusiasts seeking to achieve precise and professional outcomes.

Q:How do you use a steel square to determine the rise and run of stairs?: To determine the rise and run of stairs using a steel square, you can follow these steps: 1. Place the steel square vertically on the edge of a stair tread, aligning the long edge with the riser. 2. Adjust the square until the short leg touches the tread and the long leg aligns with the riser. 3. Read the measurement where the long leg intersects the tread. This is the run of the step. 4. Next, position the square horizontally with the short leg on the tread and the long leg against the riser. 5. Adjust the square until the short leg touches the tread and the long leg aligns with the riser. 6. Read the measurement where the long leg intersects the riser. This is the rise of the step. 7. Repeat these steps for each stair to determine the rise and run of the entire staircase.

Q:How do you use a steel square to lay out a irregular polygon shape?: To use a steel square to lay out an irregular polygon shape, first, ensure that the steel square is clean and free from any rust or debris. Next, identify the angles and sides of the irregular polygon that you need to measure and mark. Place one side of the steel square against the edge of the material you are working with. Align the other side of the steel square with the desired angle of the polygon. Hold the steel square firmly in place, making sure it does not shift during the marking process. Using a pencil or a marking tool, carefully mark along the edge of the steel square to create a straight line. Repeat this process for each angle and side of the irregular polygon that needs to be marked. Once all the necessary lines have been marked, connect the points with a ruler or straightedge to form the shape of the irregular polygon. It is important to note that the accuracy of the layout will depend on the precision of the measurements and the stability of the steel square during the marking process. Regularly check the alignment of the steel square to ensure accurate and consistent results.

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