Shandong Liaocheng Polygram Pipe Manufacturing Co. provides you with seamless steel quality inspection methods: 1. Chemical analysis: chemical analysis, instrumental analysis method (C-S-infrared instrument, direct reading spectrometer, zcP etc.). ① infrared C-S instrument: analysis ferroalloy, steel materials, iron and steel in the C, S elements. ② direct reading spectrometer: bulk sample of C, Si, Mn, P, S, Cr, Mo, Ni, Cn, A1, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi ③N-0 instrument: gas content analysis of N, O 2. Pipe geometry and appearance inspection: ① pipe wall thickness check: micrometer, ultrasonic thickness gauge, both ends of less than 8:00 and recorded. ② pipe diameter, ovality check: calipers, vernier caliper, ring gauge, measure the maximum point, minimum point. ③ length of pipe inspection: steel tape, manual, automatic length measurement. ④ pipe bending tests: ruler, level foot (1m), feeler, thin measuring curvature per meter, length of curvature. ⑤ pipe end beveling angles and blunt edges checks: Square, card board. 3. Steel surface quality inspection: 100% ① artificial visual inspection: lighting conditions, standards, experience, identity, steel turning. ② NDT inspection: a ultrasonic testing UT:. More sensitive to a variety of materials uniform surface and internal defects in material cracks. Standard: GB / T 5777-1996 levels:. C5 level b eddy current testing ET :( electromagnetic induction) mainly on the dot (hole shape) defect sensitive. Thick-walled seamless steel high-pressure principle principle thick walled high pressure seamless steel high pressure seamless steel pipe production works. High-pressure boiler cares includes the following steps: Step 1, material preparation; step two, tube heating and rotary piercing; step three, capillary dressing; Step four seamless steel tubes, thermal expansion deformation sizing; Step five, heat treatment; Step Six straightening; step seven, the mill; step eight, correction; Step nine bread type of seamless steel tubes, outer wear; Step 10, flaw detection; 11 steps, then finishing, final inspection and packaging. The present invention can be produced only in the range of a large group from the high-grade alloy seamless steel pipe, and the investment is relatively small, high product quality, high production efficiency, lower production costs. The main production process high pressure boiler steel tube and billet heating, perforated tube, pipe extension, rolling steel pipe, pipe sizing and reducing, cooling and finishing steel or can be said heating hot steel perforated embryos rolled pickling spray head cut cold drawn carbon burning method of manufacturing packaging products of petroleum cracking tube, wherein: Set the rolling stands have multiple rolls to each different configuration of multiple consecutive rolling direction The mandrel mill, after such a manufacturing line for rolling seamless steel pipe, steel pipe wall thickness in the circumferential direction of the multi-point measurement after rolling on, based on the measurement result, at least the control of the core, respectively, end positions of each axis of the final rod mandrel mill rolling mill roll the base station, so uneven wall thickness to a minimum. Alloy seamless steel pipe wall thickness error is relatively large thick hot rolled (extruded seamless pipe) production process round tube → heating → perforation → three-roll rolling, rolling or extrusion → → set off pipe diameter (or minus diameter) → cooling → straightening → hydrostatic test (or testing) → mark → storage seamless steel ingot is made of perforated or solid through the capillary tube, and then by the hot-rolled, cold-rolled or cold call is made. Seamless steel pipe wall thickness specifications mm diameter * number indicates. Hot and cold rolled seamless steel pipe points (written) seamless steel categories. Hot-rolled seamless steel pipe sub-normal, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, steel and other steel and other geological. Hot-rolled seamless pipe diameter is generally greater than 32mm, wall thickness 2.5-200mm, cold-rolled seamless steel pipe at the path can go to 6mm, wall thickness can be 0.25mm, outer diameter thin-walled tube to 5mm thickness less than 0.25mm, cold than hot-rolled high dimensional accuracy. Seamless is 10,20,30,35,45 and other high quality carbon steel 16Mn, 5MnV low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2,40MnB such as structural steel hot-rolled or cold-rolled steel. 10,20 and other low-carbon steel seamless pipe is mainly used for fluid pipes. Seamless 45,40Cr etc. made of carbon steel used to manufacture mechanical parts, such as cars, tractors and the force components. General seamless steel pipes to ensure the strength and flattening test. Hot-rolled steel hot-rolled state or heat treatment delivery; hot-rolled seamless steel triangle, by definition, high temperature rolling ingot type of seamless steel tubes, so small deformation resistance, can achieve a large deformation. The steel rolling, for example, generally slab thickness of about 230mm, and after roughing and finishing, final thickness of 1 ~ 20mm. Meanwhile, due to the small plate thickness ratio, dimensional accuracy requirements are relatively low, flatness problem is not prone to control crown based. Outside the inner circle of six seamless steel pipe, seamless steel pipe, seamless steel pipe shaped by Shandong Liaocheng Steel Pipe Manufacturing Co., Polygram. Shandong Liaocheng Polygram Pipe Manufacturing Co. (www.lcbljgg.com) (www.lcbljgg.com) (www.sdlcblj.com) (www.bljggzz.com) strong, credible, Shandong Liaocheng wire, tubes, plates and other manufacturing equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Polygram pipe into the brilliant and you work for a better future!