Who has the stainless steel seamless pipe specification sheet?

Stainless steel seamless pipe specification table is as follows

Stainless steel seamless pipe is a kind of long steel with hollow section and no seam around it. The thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the higher the processing cost.

The technology of this product determines its limited performance. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low brightness inside and outside the pipe, high length cost, and pits and black spots inside and outside the pipe are not easy to remove; Its detection and shaping must be done offline. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.

kind

Stainless steel pipes are divided into hot rolling, hot extrusion and cold drawing (rolling) according to rolling methods.

According to the different metallographic structure of stainless steel, it can be divided into semi-ferritic semi-martensitic stainless steel seamless tube, martensitic stainless steel seamless tube, austenitic stainless steel seamless tube and austenitic-ferritic stainless steel seamless tube.

Specification and appearance quality

A. According to GB 14975-2002 Seamless Stainless Steel Pipe, the usual steel pipe length (indefinite length) is 1.5 ~ 10m for hot-rolled steel pipe and 1m for hot-extruded steel pipe. The wall thickness of cold-drawn (rolled) steel pipe is 0.5 ~1.0 ~ 7m; ， 1.0 ~ 7m； If the wall thickness is greater than 1.0mm, it is 1.5 ~ 8m.

B, 45 kinds of hot-rolled (hot-extruded) steel pipes with diameters of 54 ~ 480mm * * * * 36 species with wall thickness of 4.5 ~ 45 mm * * *. 65 kinds of cold-drawn (rolled) steel pipes with diameters of 6 ~ 200mm * * *; The wall thickness is 0.5 ~ 2 1mm * * * 39 kinds.

C. There shall be no cracks, folds, cracks, cracks, rolling injuries, delamination and scarring on the inner and outer surfaces of steel pipes. These defects shall be completely removed (except for pipes used for mechanical processing), and the thickness and outer diameter of the removed rear wall shall not exceed negative deviation. Other minor surface defects not exceeding the allowable negative deviation may not be removed.

D, the allowable depth of the straight line. Hot-rolled and hot-extruded steel pipes with a diameter less than or equal to 140mm should not be greater than 5% of the nominal wall thickness, and the maximum depth should not be greater than 0.5mm；; Cold-drawn (rolled) steel pipes should not be greater than 4% of the nominal wall thickness, and the maximum depth should not be greater than 0.3 mm. ..

E, steel pipe ends should be cut into right angles, and deburring.

Manufacturing technology of stainless steel seamless steel pipe

1. Hot rolling (extrusion of seamless steel tube): round tube blank → heating → piercing → three-roll skew rolling, continuous rolling or extrusion → tube stripping → sizing (or reducing) → cooling → straightening → hydrostatic test (or flaw detection) → marking → warehousing.

The raw material for rolling seamless pipes is a round tube blank, which is cut by a cutting machine to a length of about 1 m and sent to a furnace by a conveyor belt for heating. The billet is heated in the furnace at a temperature of about 1200℃. The fuel is hydrogen or acetylene. Temperature control in the furnace is a key problem. After the round tube blank is discharged from the furnace, it should be perforated by a pressure piercer. The common piercer is the cone roller piercer, which has the advantages of high production efficiency, good product quality, large aperture expansion, and can pierce a variety of steel grades. After piercing, the round tube blank is continuously rolled by three rollers, continuously rolled or extruded. After extrusion, remove the tube and measure the size. The sizing machine rotates the cone drill bit to the billet at high speed to punch holes, thus forming the steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit of the sizing machine. After sizing, the steel pipe enters the cooling tower and is cooled by spraying water. After cooling, the steel pipe will be straightened. The straightened steel pipe is sent to a metal flaw detector (or hydrostatic test) by a conveyor belt for internal flaw detection. If there are cracks and bubbles in the steel pipe, they will be detected. After the quality inspection, steel pipes have to undergo strict manual selection. After quality inspection, steel pipes should be painted with number, specification and production batch number. And hoisted into the warehouse with a crane.

2. Cold-drawn (rolled) seamless steel tube: round tube blank → heating → piercing → upsetting → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → tube blank → heat treatment → straightening → hydrostatic test (flaw detection) → marking → warehousing.

The rolling method of cold-drawn (rolled) seamless steel pipe is more complicated than hot-rolled (extruded) seamless steel pipe. The first three steps of their production process are basically the same. The difference begins with the fourth step. After the round tube blank is hollowed out, upsetting annealing should be carried out. After annealing, use special acidic liquid for pickling. After pickling, coat with oil. Followed by multi-pass cold drawing (cold rolling) and re-blank tube, as well as special heat treatment. It will straighten after heat treatment.