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　　Hollow sections Let's see what kind of pipe we want to bend, since it is manual bending, it can not be unlimited any pipe can be. The diameter of the pipe is very important to the wall thickness of the pipe, the most important thing is to choose as far as possible in line with the GB8162 or 8163 seamless steel pipe. The thinner the ASTM A500 Hollow Sections, the easier it is to break, but the thicker the wall, the harder it is to bend, and the hollow sections is easier to bend successfully than the seamed tube. Before bending the steel pipe, we need to prepare some sand and two plugs. First a plug is used to plug one end of the pipe, then fine sand is filled into the pipe, and then a plug is used to plug the other end of the pipe.

　　In this way, when bending, it can ensure that the hollow sections does not shrink and maintain the maximum roundness. When plugging the pipe head, it is best to use steel nails to pin several pits to ensure that the plug does not fall off during bending. And then, before bending, we burn the bending part of hollow sections on the gas stove for a while, making it softer and easier to bend. When burning, turn around to make sure the pipes are soft.

　　How to bend the square tube manually next, we according to the hollow sections to bend the shape and size of the rollers prepared, the wheel fixed on the board, one hand to hold one end of the steel pipe, the other hand to hold the other end, to bend the part of the roller against the force gently bending, you can easily bend into the arc we need. How to bend the steel pipe manually, of course, after bending you will find that, although we have taken a lot of measures, but the ultimate bending of the hollow sections radian than machine bending or casting is still somewhat different.

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