Datong Hydraulic

   ST37.4 NBK Hydraulic tubes are made in accordance to DIN 2391 or DIN 2445. It also called as cold drawn precision tube . ST37.4 NBK hydraulic tubes have a NBK finishing, where tubes are normalized, phospated, and oiled inside and outside. ST37.4 Hydraulic tubes  are measured by Outer Diameter (OD) and varies tube thickness (THK). Difference of OD and tube thickness will lead to different working pressure.  There are two type of material grade for hydraulic steel tubes , ST52.4 and ST37.4. ST52.4 is high tensile strength tube means it has higher permissible working pressures by reduced tube wall thickness, and leading to reduced system overall weight. Please refer to chemical composition for ST52.4 and ST37.4 tube material: CHEMICAL COMPOSITIONS OF HYDRAULIC STEEL TUBE MATERIALS Chemical Composition (%) Carbon (C) Silicon (Si) Manganese (Mn) Phosphorus (P) Sulfur (S) E355 (ST52.4) ⩽0.22 ⩽0.55 ⩽1.6 ⩽0.045 ⩽0.045  E235 (ST37.4) ⩽0.17 ⩽0.35 ⩽1.2  ⩽0.045...

  DIN2391   E235 ST37.5 precision steel tube   is produced by   seamless cold drawn , and bright annealed in a controlled atmosphere furnace to keep the surface quality bright and smooth, then galvanized coating the surface. E235 grade or as referred to as EN 1.0308 steel is a non-alloy carbon steel grade. Essentially, E235 is the chemical designation for the English standard. The EN 10294-1 Grade E235 is an unalloyed steel that is well suited for machining without the use of a heat treatment.  E235 ST37.5 precision steel tube is used in a variety of industries, including oil and gas, waterjet cutting, food processing, petrochemical/chemical, and many others for fluid handling.   Oil and gas:  The oil and gas industry has many uses for high pressure stainless steel tubing. In the field, high-pressure tubing is used for down-hole control systems,  hydraulic cylinder  and pneumatic piping, chemical injection modules, vacuum systems, and mu...