Characteristics and Applications of ASTM4140 Precision Bright Seamless Steel Pipe
Hit：112026-01-21 16:43:48
Characteristics and Applications of ASTM4140 Precision Bright Seamless Steel Pipe
Machinery such as automobiles and mechanical parts have high requirements for the accuracy and smoothness of steel pipes. Precision steel pipe users are not just those who require high precision and smoothness. Due to the high precision of precision bright pipes and the ability to maintain tolerances of 2-8 threads, many mechanical processing users are gradually transforming seamless steel pipes or round steel into precision bright pipes in order to save labor, material, and time losses. This material is mainly used for producing pneumatic or hydraulic components such as cylinders and oil cylinders, and is widely used in mechanical manufacturing, automotive industry, aerospace, medical equipment, and energy industries. The product implementation standards include GB/T3639, DIN2391-94/C, etc. Common materials include carbon steel (10 #, 20 #, 45 #), alloy steel (Q345b, 40Cr), and St35 (E235) series [1-3]. The production process includes processes such as heating the tube blank, perforation, rolling the tube, sizing and straightening, heat treatment, and non-destructive testing. Some enterprises use oxygen free annealing technology to improve surface quality. The industry development trend focuses on the development of higher precision, thinner and thicker products, as well as the upgrading of intelligent production. Precision tubes, also known as precision seamless steel pipes or welded pipes, are high-precision steel pipe materials mainly composed of carbon, silicon, manganese, sulfur, phosphorus, and chromium. It is made of high-quality carbon steel through precision rolling, non oxidizing bright heat treatment (NBK state), cold rolling, cold drawing and other processes. The inner and outer walls have high precision (outer diameter tolerance ± 0.05- ± 0.1mm, wall thickness tolerance within ± 0.05mm) and high smoothness (surface roughness Ra value 0.8-1.6 μ m), and can withstand high pressure without deformation during cold bending.
