Stainless steel bend is also a type of stainless steel tube, which is mainly to distinguish the shape of the pipe from the shape of the pipe, including the u-tube, the j-type, the s-type pipe, and 90 degree snake-head bend.
The bending of the bent tube is divided into hot and cold, which is mainly used for the hard and variable type of steel pipe, such as the heat of the carbon steel pipe. The cold stewed bend is mainly used for the relatively hard material of the galvanized pipe. When it’s cold, it goes without saying, and it’s just a matter of turning the bending machine into a bend and turning it into a bend.
The process of simmering the heat is much more complex, mainly divided into these steps.
A steel pipe material, the incoming inspection, including chemical element spectrum examination, the tensile strength and impact strength, hardness of materials (can measure brinell and vickers hardness, hardness, etc.) on the Richter scale, learn about its further processing.
Second, the pipeline of blanking, according to the required degree of bent pipe is calculated into straight pipe length blanking, and blanking must have a certain margin, to ensure the machining allowance.
Three, roasted bend, through the intermediate frequency electric heater heat to simmer roasted bend segment to need the number of degrees, again through the simmer bending machine set degree, slowly simmer bending pipe, finally complete the whole segment reserved after simmer bending bends straight pipe length cutting pipe bending.
To get into the process of the next bend pipe, through the lathe, turn the pipe into a slope of about 40 degrees, and remain blunt. Processing is completed, is to examine the bent pipe size, meet the requirements into the bent pipe heat treatment, common (steel tube) is heated to above 500 degrees Celsius, constant temperature and a half hours, then cool air condition. Then, the quality of production is ensured by magnetic particle testing and ultrasonic testing.
Carbon steel: ASTM/ASME A234 WPB, WPC
Alloy: ASTM/ASME A234 WP 1-wp 12-wp 11-wp 1-wp 5-wp91-wp911, 15mo315crmov, 35CrMoV
Stainless steel: ASTM/ASME A403 WP 304-304l-304l-304n-304n
ASTM/ASME A403 WP 316-316l-316316316316316n-316ti
ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low temperature steel: ASTM/ASME A402 WPL3 – WPL 6
High performance steel: ASTM/ASME A860 WPHY 42-462-60-65-70
Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon and drain, PVC, PPR, RFPP (enhanced polypropylene) etc.
It can be divided into two categories: pushing, pressing, forging, casting and so on.
The standards of manufacturing are divided into the national standard, the electric standard, the ship standard, the scale of the scale, the water standard, the standard, the German, the Japanese, the Russian standard, etc.
According to its curvature radius, it can be divided into long radius bend and short radius bend. The radius of a long radius means that the radius of the curvature of the tube is equal to 1.5 times the diameter of the pipe, which is R = 1.5 D. A short radius bend means that the radius of the curvature is equal to the outer diameter of the pipe, which is R = 1.0 D. (D is the diameter of the bend, R is the radius of curvature). If you follow the stress level: there are about a dozen or so, and the standard for the American pipe is the same: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, schaft, XS. Sch80, SCH100, Sch120, Sch140, Sch160, XXS; The most commonly used are STDS and XS.
Besides the above said is only the small diameter pipe bending, if there are any large diameter pipe bending, because there is no such a large diameter seamless pipe, also USES the steel plate round tube of legal system, which will meet the welding, welding according to the different welding materials used in the pipe is also differentiated, after been in straight seam pipe welding is bend pipe into roasted the process.
Source: China Stainless Steel Bend Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)