This article was generated by Quantum Sketch s235jr seamless pipe
The s235jr seamless pipe is mainly made of Q235 . This material is generally used to make auto parts and mechanical parts. It has good corrosion resistance and mechanical properties, and has a long service life. The s235jr seamless pipe refers to the steel pipe made of Q235 material, which is improved on the basis of the seamless steel pipe for ordinary fluid transportation. S235jr seamless pipe has the mechanical properties and stable carbide form of high-quality carbon structural steel, while maintaining the strength of the steel pipe and preventing brittle fracture during cold bending. s235jr seamless pipes are widely used in petroleum, chemical, electric power, light industry, textile, food and machinery manufacturing industries, such as refineries, chemical plants, oil wells, etc. S235jr seamless pipe has excellent comprehensive mechanical properties, including: mechanical properties and process properties, high yield strength (tensile strength and yield), good cold work hardening tendency, and smoothness. S235J seamless pipe has good low temperature toughness (impact toughness), hardenability and seizure resistance. S555xnn: 2-2-3-4-6 means the sum of the Arabic numerals at the beginning of the steel number. Steel pipes are generally flat-welded or coiled and then cold-flared with loopers. When the temperature is on. When the temperature is below C , cold expansion can be used; when the temperature is . Thermal expansion should be used when C is above; when it is greater than. Mang inch can use thermal expansion. Flared flanges cannot be used when the end face of the steel pipe has burrs or edges, otherwise the end face will be easily scratched or scratched and the service life of the pipe will be affected.
1. The steel pipe should be subjected to X- ray CT non-destructive testing. The allowable deviation of the outer diameter of the steel pipe is ±2 mm , and the allowable deviation of the wall thickness is ±1.5 mm . If it is unqualified, it should be rejected.
(3) The perforation of the tube blank should be uniform, and the adjacent strip steel should not be damaged. (4) After the steel pipe is pierced, the accumulated water in the pipe should be removed immediately, and the manufacturer should be notified immediately to change the wall thickness. Steel pipe perforation is to cut a seamless pipe into several isosceles triangles with a certain length, then insert the two isosceles triangles into the grooves at the bottom of the pipe in parallel, and then bend 1/4 arcs at both ends made. This process has high productivity and good yield, but requires a large number of blanks with specifications, and requires that the edges of the steel plate and the steel strip are neat and consistent. Therefore, under the conditions of producing small diameter and large length steel pipes. The regulation (6) is adopted for the edge tolerance of the steel strip , that is, the edge line width tolerance is about 20pm . (7) The tube blank cannot be turned over (8) After the steel pipe is pierced, the manufacturer must be notified immediately to change the wall thickness in order to change the production plan and arrange the next process.
- Tube end welding must be inspected by X -ray diffraction and metallographic microscopy.
[ s235jr seamless pipe] Q235L seamless steel pipe (also known as: hot-rolled pipe, cold-drawn pipe). (1) The production process is simple, the cost is low, it is easy to realize mechanization and automation, the production efficiency is high, and the development is rapid; but during cold bending processing, the yield surface is large and the wall thickness is uneven, which affects the effective size of the steel pipe; low strength , Good toughness: the strength is lower than that of Q345D steel pipe. Q235L seamless steel pipe; with high but not strong mechanical strength: when welding, its tensile strength and shear stress can reach 70 MPa and 5 MPa respectively . [S235L seamless steel pipe; also known as: hot-rolled pipe, cold-drawn pipe, precision seamless pipe, etc.;] Q235L seamless steel pipe is divided into two types: hot-rolled and cold-rolled (drawn): Processing and forming, and cold rolling refers to a process formed after cold hardening treatment (such as low temperature tempering, etc.) on hot-rolled tubes that have been hot-formed.
- The chemical composition and mechanical properties of the welding wire and the base metal should be consistent.
[3] Steel pipe specification and its code name: seamless steel pipe [W welded pipe is used for structural pipes], generally used in pipelines such as oil and natural gas transportation, such as oil pipes and fertilizer pipes. Longitudinal welded pipe [straight butt welded pipe for W welding] is a seam welded steel pipe used for conveying fluids. Steel pipes can be divided into round pipes and special-shaped steels according to the shape of the cross-sectional area, and can be divided into straight seam submerged arc welded seamless pipes and spiral seam submerged arc welded seamless pipes according to the shape of the weld. According to the purpose, it can be divided into structural use, special purpose (such as high pressure water delivery, etc.), spiral welded steel pipe and spiral submerged arc welded steel pipe, in addition to high frequency welded pipe and gas cylinder fittings.
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