25*30P type pipe for frame beds, 15*25P cold-rolled steel pipe for furniture

1. **25*30P Pipe for Skeletal Beds** - **Features and Applications**: - **Dimensional Compatibility**: The 25*30P pipe size (assuming 25mm as width, 30mm as height) is well-suited for the skeletal bed frame structure. This size ensures structural integrity without making the bed appear overly cumbersome. In skeletal bed design, the P pipe can serve as the main frame, connecting the legs and cross supports, offering a sleek look with its smaller dimensions. - **Structural Support**: Skeletal beds must bear the weight of both the human body and the mattress. The 25*30P pipe's structure effectively distributes these weights. Its shape and size provide excellent support in both vertical and horizontal directions, preventing bed deformation. - **Manufacturing Process and Quality Requirements**: - **Cold Hardening Process**: For this furniture-grade P pipe, cold hardening enhances the material's strength. During the cold hardening process, the pipe is cold rolled to achieve work hardening, thereby increasing its yield and tensile strength. Generally, the yield strength of the cold-hardened pipe reaches approximately 250-300MPa to meet the bed's support requirements. - **Dimensional Requirements**: Due to its use in skeletal beds, the 25*30P pipe's dimensional accuracy is crucial. The width and height tolerances are typically controlled within ±0.3mm, while wall thickness tolerances are within ±0.1mm. This ensures proper fit between pipe components during assembly, enhancing the bed's stability and overall quality. - **Surface Quality Requirements**: The pipe surface should be smooth and even, free of visible scratches, indentations, or protrusions. This not only ensures aesthetics but also prevents damage to the mattress or injury to the user during use. Additionally, to prevent rust, the pipe surface may undergo some surface treatment, such as galvanizing or plastic coating. 2. **15*25P Cold-Hardened Steel Pipe for Furniture** - **Features and Applications**: - **Application Scenarios in Furniture**: The 15*25P steel pipe (assuming 15mm as width, 25mm as height), due to its smaller size, has multiple applications in furniture manufacturing. It can be used to make the frames of small furniture items like small chairs and coffee tables. In these items, it provides adequate structural support while its cold-hardened characteristics make the furniture more durable. Moreover, the P pipe's shape can be used to conceal wires or as decorative edge elements. - **Advantages of Cold Hardening**: Cold hardening gives the 15*25P steel pipe high strength and good wear resistance. During frequent use, such as chairs' legs being frequently rubbed and pressured, cold-hardened steel can better withstand these external forces, extending the furniture's lifespan. Its yield strength is generally around 200-250MPa, suitable for the load-bearing requirements of small furniture. - **Manufacturing Process and Quality Control**: - **Details of Cold Hardening**: During the cold hardening process, controlling the degree of deformation is critical. For the 15*25P steel pipe, the deformation is typically between 20%-40%, effectively increasing the pipe's hardness and strength without making it overly brittle and affecting its machinability. Deformation can be adjusted by controlling the pressure and speed of the rolling mill rolls. - **Quality Control Points**: Similar to the specialized P pipe for skeletal beds, the 15*25P steel pipe's dimensional requirements are stringent. Width and height tolerances are controlled within ±0.2mm, and wall thickness tolerances within ±0.08mm. In terms of surface quality, the pipe surface should be free of rust, scale, and other defects. After cold hardening, some post-processing may be required, such as polishing, to achieve a surface roughness Ra value of about 0.8-1.6μm, enhancing its aesthetic and corrosion-resistant qualities.