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: structural analysis alloy pipe, 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. Steel pipe manufacturers custody practical tips 1. Select the appropriate venues and steel warehouse storage space or warehouse, should be selected in the clean, smooth drainage area, away from harmful gases or dust in factories and mines. Presence on the ground to clear the weeds and all sorts of things, to keep the steel clean. Not in a warehouse with acid, alkali, salt, cement, steel and other aggressive materials stacked together. Different varieties of steel should be stacked separately, to prevent confusion and prevent contact corrosion. Large steel, rail, steel disgrace, large diameter pipes, forgings, etc. can open dumps. Small steel, wire rod, rebar, the diameter steel wire and wire rope, etc., can be stored for 8162 structural tube material in a well-ventilated shed, but it must be on the thatch underlay. Some small steel, sheet, strip, silicon, or thin-walled steel pipes of small diameter, a variety of cold-rolled, cold-drawn steel and high prices, corrosive metal products, can be stored for storage. Treasury should be selected according to the geographical conditions q345b structure, the normal ordinary enclosed warehouse, that roof with walls, doors and windows tight, with the Treasury ventilation device. Treasury requires attention to ventilation sunny, rainy close attention to moisture, keep proper storage environment. 45 # structural tube, structural tube manufacturers (certified), structural tubes supplied by Polygram Liaocheng Steel Pipe Manufacturing Co., Ltd .. Shandong Liaocheng Polygram Pipe Manufacturing Co. (www.lcbljgg.com) (www.lcbljgg.com) (www.sdlcblj.com) (www.bljggzz.com) Shandong Liaocheng, wire, pipe, plate manufacturing equipment leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Polygram steel leader with the staff warmly welcome all inquiries negotiations to create Polygram steel a better future. You can also access (www.lcbljgg.com/supply_details_43524190.html), for more information about the company.