P-type welding pipes for furniture, black annealed P-type pipe sizes, custom P-type pipesHere are some common sizes of black annealed P-trough tubes for furniture use, as well as information on custom-made P-trough tubes: 1. **Common Black Annealed P-Trough Tube Sizes**: - **Small Size Series**: 25×25, 30×50, 35×70, 31×71, 33×72, etc. These small-sized P-trough tubes are commonly used for small furniture components, such as the frames of small tables and chairs, decorative lines on furniture, or support structures for some small storage shelves. - **Medium Size Series**: 40×60, 45×117, 50×90, 60×60, etc. Medium-sized black annealed P-trough tubes are suitable for constructing frames of medium-sized furniture, like some medium-sized sofa frames, coffee table support legs, or bookshelf frames. - **Large Size Series**: For some special large furniture or furniture requiring special structural support, larger size P-trough tubes such as 80×100 and above may be used, but they are relatively less common in the furniture industry. 2. **Custom-Made P-Trough Tubes**: - **Material Selection**: In addition to the common Q235 material, other materials like 45# steel can be chosen based on the specific use environment and requirements of the furniture to meet different strength, hardness, and corrosion resistance needs. - **Size Customization**: Specific side lengths, wall thicknesses, and bending angles can be customized according to the unique design requirements of the furniture. For example, P-trough tubes of appropriate lengths can be custom-made based on the overall dimensions and structural design of the furniture, or special proportioned side lengths can be designed to fit specific furniture shapes. - **Surface Treatment**: Different surface treatment methods can be selected based on the use environment and appearance requirements of the furniture. In addition to black annealing, options include galvanizing, painting, and plastic coating to enhance the corrosion resistance, wear resistance, and aesthetic appeal of the P-trough tubes. - **Processing Technology**: When custom-making P-trough tubes, special processing techniques can be requested from manufacturers, such as drilling holes, cutting slots, or making cuts on the tubes, to facilitate subsequent assembly and connection.