High Quality GB Standard Steel Square Bar 26mm-30mm

High Quality GB Standard Steel Square Bar 26mm-30mm System 1

High Quality GB Standard Steel Square Bar 26mm-30mm

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t

Supply Capability:: 10000 m.t/month

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Product Description:

We offer Square Steel Bar with grade Q195 / Q235

Specifications of Square Steel Bar:

-Standard: GB,

-Grade: Q195/Q235 or equivalent.

Chemical Composition:

-Chemical Composition. Q195

Standard	Grade	Element (%)
GB	Q195	C	Mn	S	P	Si
GB	Q195	0.06~0.12	0.25~0.50	≤0.050	≤0.045	≤0.30

-Chemical Composition. Q235

Standard	Grade	Element (%)
GB	Q235B	C	Mn	S	P	Si
GB	Q235B	0.12~0.20	0.30~0.70	≤0.045	≤0.045	≤0.30

Measures and Tolerances of Square Steel Bar:

Section of Square Steel Bar.

(The section of Square Steel Bar)

-The length of a side and the theoretical weight of Square Steel.

Length of a side(a, mm)	Theoretical weight(kg/m)	Length of a side(a, mm)	Theoretical weight(kg/m)
6	0.283	32	8.04
7	0.385	＊33	8.55
8	0.502	34	9.07
9	0.636	＊35	9.62
10	0.785	36	10.17
11	0.950	38	11.24
12	1.13	40	12.56
13	1.33	42	13.85
14	1.54	45	15.90
15	1.77	48	18.09
16	2.01	50	19.63
17	2.27	53	22.05
18	2.54	＊55	23.6
19	2.82	56	24.61
20	3.14	＊58	26.4
21	3.46	60	28.26
22	3.80	63	31.16
＊23	4.15	＊65	33.17
24	4.52	＊68	36.3
25	4.91	79	38.49
26	5.30	75	44.16
＊27	5.72	80	50.24
28	6.15	85	56.72
＊29	6.60	90	63.59
30	7.06	95	70.85
＊31	7.54	100	78.50

Notes:

1, The theoretical weights in the list, base on the density of 7.85 g/cm3.

2, The numbers with ＊mean that they are not regulars or we don’t offer them.

-The allowed tolerance of Square Steel:

Length of a side(mm)	Allowed Tolerance
Length of a side(mm)	Group1	Group2	Group3
5.5～7	±0.20	±0.30	±0.40
7～20	±0.25	±0.35	±0.40
20～30	±0.30	±0.40	±0.50
30～50	±0.40	±0.50	±0.60
60～80	±0.60	±0.70	±0.80
80～110	±0.90	±1.0	±1.1
110～150	±1.2	±1.3	±1.1
150～190	――	――	±2.0
190～250	――	――	±2.5

Usage/Applications of Steel Square Bar:

-The Square Steel is normally used as structure steel.

-Row material for other structure steel like steel angles, channels, I-beams, H-beams, etc…

Packaging & Delivery of Steel Square Bar:

-Packing Detail: The products can be packed in bundles by steel wires.

-Marks:

1, Tag marks: the tag marks will be tied up to each bundle of the products. The information is usually including supplier’s logo and name, product name, made in China, products’ specifications, the painted color and other information requested by customers.

2, Color marks: we will paint both ends of the bundles of these products to make sure that they are more evident. It’s will be more convenient for the customers to distinguish them at the destination port.

-Delivery Detail: 30~45 working days after receive buyer’s T.T. or L/C.

Transportation:

-The products can be delivered by bulk vessel or by container. As for container, products with the length of 6m will be loaded in 20’ container, with 9m or 12m, in 40’ container.

-The maximum quantity of loading of container is 25 tons.

-The products usually are transported to the nearest port from the production place.

Q: How do you use a steel square to measure and mark 281.25-degree angles?: To use a steel square to measure and mark a 281.25-degree angle, you would first align one edge of the square with a reference line. Then, locate the degree markings on the square and find the 281.25-degree mark. Place a mark or draw a line at that point on your work surface to indicate the desired angle.

Q: Can a steel square be used for marking out dovetail joints?: Yes, a steel square can be used for marking out dovetail joints. A steel square is a versatile tool commonly used in woodworking for measuring, marking, and checking the accuracy of right angles. When marking out dovetail joints, precision and accuracy are crucial, and a steel square can provide the necessary reference for ensuring the correct angles and dimensions are achieved. By aligning the square along the edges of the workpiece, it can help guide the marking of the dovetail angles and provide a straight edge for accurate cutting. However, it is important to note that while a steel square can be a useful tool, it is recommended to also use a dovetail marking gauge or a dovetail template to ensure the best results and maintain consistency throughout the project.

Q: What are the common applications of a steel square in metalworking projects?: A versatile tool commonly used in metalworking projects is the steel square, also known as a framing square or carpenter's square. Its primary functions include making accurate measurements, marking straight lines, and checking for squareness and angles. In metalworking projects, the steel square has various applications: 1. Measurement and marking: Metalworkers use the steel square to measure and mark precise dimensions on metal sheets or bars. This ensures accuracy when cutting, drilling, or bending metal pieces. 2. Squareness check: The steel square is crucial for checking if a metal piece or joint is perfectly square. By aligning the square against edges or corners, metalworkers can ensure that their projects are properly squared and aligned. 3. Angle determination: Steel squares come with angle measurements, such as 45 degrees and 90 degrees. Metalworkers use these angles to accurately determine and mark the required angles for cutting, shaping, or welding metal pieces. 4. Layout and design: Steel squares are valuable for layout and design work in metalworking projects. They enable the drawing of parallel lines, perpendicular lines, or creation of right angles for designing metal frames, brackets, or other components. 5. Machinery setup: Precise alignment and positioning are necessary for metalworking machinery. Metalworkers can use the steel square to align machinery components, such as blades, fences, or guides, ensuring they are perpendicular or parallel to the work surface. 6. Welding and fabrication: Steel squares are indispensable for welding and fabrication projects. They aid in aligning and clamping metal pieces together at precise angles, resulting in strong and accurate welds. 7. Flatness check: Metalworkers can use steel squares to check the flatness of metal surfaces. By placing the square against the metal, any gaps or inconsistencies can be easily identified, allowing necessary adjustments to be made. In conclusion, the steel square is an essential tool in metalworking projects. It provides accurate measurements, ensures squareness, determines angles, and assists in layout and design work. Its versatility makes it a must-have for metalworkers of all skill levels.

Q: Can a steel square be used for marking out half-lap joints?: Marking out half-lap joints can be done with a steel square. A steel square, also known as a framing square or carpenter's square, is a versatile woodworking tool used for measuring and marking angles and lines. It consists of a long arm called the blade and a shorter arm called the tongue, which are perpendicular to each other. To mark a half-lap joint with a steel square, the woodworker starts by determining the width of the joint and marking it on one piece of wood's edge. Next, they align the blade of the steel square with the marked line and draw a line across the wood's face. This process is repeated on the other piece of wood that will form the joint, ensuring that the lines align properly for a tight fit. The steel square's accuracy and precision make it ideal for marking out half-lap joints. It allows for consistent and symmetrical lines, resulting in strong and well-fitting joints. However, it's important to note that the steel square is just one tool in the process of creating a half-lap joint. Other tools, such as a saw and chisel, are also necessary to complete the joint.

Q: Can a steel square be used for checking the plumbness of a beam?: Incorrect, a steel square is not suitable for assessing the verticality of a beam. A steel square, also referred to as a framing square, primarily serves the purpose of measuring and marking right angles. It lacks the necessary design and calibration for determining the plumbness of a beam. In order to properly assess the verticality of a beam, it is recommended to utilize either a level or a plumb bob. A level is equipped with a bubble vial that indicates whether a surface is oriented vertically or horizontally, while a plumb bob consists of a weighted string that hangs in a straight line to establish a true vertical reference. These tools are specifically engineered for evaluating plumbness and offer superior accuracy in comparison to a steel square.

Q: Can a steel square be used for checking the squareness of a table?: Indeed, a table's squareness can be evaluated using a steel square. Functioning as a measurement device, a steel square comprises a metal blade complemented by a perpendicular handle. It is frequently employed in carpentry and various other trades to guarantee the presence of right angles and squareness. To assess a table's squareness, one can position the steel square against the table's edges or corners to ascertain if they create impeccable right angles. In the event that the table is square, the steel square's blade ought to flawlessly align with the edges, signifying the table's squareness. Nonetheless, it is crucial to ensure that the steel square itself is accurately manufactured and calibrated to guarantee dependable outcomes.

Q: How do you use a steel square to measure the width of a picture frame?: To measure the width of a picture frame using a steel square, you would place one edge of the square against the inside of the frame, ensuring it is flush with the corner. Then, you can read the measurement off the scale on the square where the other edge aligns with the opposite side of the frame. This will give you an accurate measurement of the frame's width.

Q: How do you use a steel square to find angles for compound bevel cuts?: To use a steel square to find angles for compound bevel cuts, you need to follow a few steps: 1. Understand the concept: Compound bevel cuts involve two angles that need to be set correctly to achieve the desired cut. These angles are typically referred to as the miter angle and the bevel angle. 2. Set the miter angle: The miter angle determines the horizontal angle of the cut. To find this angle, place the steel square against the edge of the workpiece and align it with the desired miter angle. Make sure the long edge of the square is parallel to the edge of the workpiece. 3. Mark the miter angle: Once the steel square is aligned, use a pencil or a marking knife to mark the edge of the workpiece using the long edge of the square as a guide. This mark represents the miter angle for your compound bevel cut. 4. Determine the bevel angle: The bevel angle determines the vertical angle of the cut. To find this angle, place the steel square against the face of the workpiece and align it with the desired bevel angle. Ensure that the short edge of the square is perpendicular to the face of the workpiece. 5. Mark the bevel angle: Once the steel square is aligned, use a pencil or a marking knife to mark the face of the workpiece using the short edge of the square as a guide. This mark represents the bevel angle for your compound bevel cut. 6. Adjust your tools: With the miter and bevel angles marked, you can now adjust your tools accordingly. Depending on the type of compound bevel cut you are making, you may need to adjust the miter gauge on a table saw or the bevel angle on a compound miter saw. 7. Make the cut: Once your tools are properly set, carefully position the workpiece according to the marked angles and make the compound bevel cut, ensuring safety precautions are taken. Remember, practice and precision are key when working with compound bevel cuts. It's always a good idea to double-check your angles and make test cuts on scrap material before working on your final project.

Q: What are some common materials used to make steel squares?: Some common materials used to make steel squares include stainless steel, carbon steel, and alloy steel. Stainless steel is often preferred for its durability and corrosion resistance. Carbon steel is commonly used for its strength and affordability. Alloy steel, which is made by adding other elements such as chromium, manganese, or vanadium to carbon steel, offers improved strength and hardness. These materials are chosen based on the specific requirements of the application and the desired properties of the steel square.

Q: How do you use a steel square for marking stair skirt board angles?: Using a steel square for marking stair skirt board angles is a straightforward process. Here's a step-by-step guide on how to do it: 1. Start by measuring the rise and run of the stairs. The rise is the vertical height between two stair treads, while the run is the horizontal distance from one tread to another. Write down these measurements as they will be crucial for the next steps. 2. Place the steel square against the skirt board, ensuring that the long arm of the square is vertical and aligned with the edge of the board. 3. Determine the angle for the skirt board by referencing the rise and run measurements. For example, if the rise is 7 inches and the run is 10 inches, divide the rise by the run (7/10) to get the decimal value of 0.7. Look for this decimal value on the steel square's rise and run tables, usually located on the inside of the square's body. 4. Once you have located the decimal value on the rise and run tables, find the corresponding number on the blade of the steel square. This number represents the angle at which you need to cut the skirt board. 5. Using a pencil or marking tool, mark the determined angle on the skirt board based on the reference number on the steel square's blade. 6. Double-check your measurements and markings to ensure accuracy before proceeding with cutting or any further steps. By following these steps, you can effectively utilize a steel square to mark stair skirt board angles. It is always important to measure carefully and double-check your calculations to achieve precise and accurate results.

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