The sale of products implementing national standards: GB / T8162-2008 (structural pipe), GB / T8163-2008 (fluid pipe), GB / T3087-2008 (low pressure boiler pipe), GB / T5310-1995 (high-pressure boiler tube ), GB / T17396-1999 (hydraulic prop tube) GB / T6479-2000 (fertilizer dedicated pipe), GB / T3639-2008 (drawn or cold rolled precision seamless steel tubes) and so on. Over the years, my company, "high quality efficient, compliance heavy reputation" business philosophy and services aim to provide our clients with quality products and service, get all the new and old customers the support and praise. I solemnly promise: In the same quality, to ensure the best quality at the lowest price, best service to thank friends for their support and love, the library does not have the specifications and materials may advance telephone orders, special materials, specifications can also be customized to ensure timely delivery. 1. Identification of shoddy steel precision tubes prone to folding. Folding is formed on the surface of a variety of steel fold, this defect often throughout the product vertical. The reason is due to shoddy manufacturers of folding the pursuit of high efficiency, seamless steel pickling reduction is too large, resulting in the ears, it creates a rolling when folded down, it will crack when folded seamless steel pickling products Bend manufacturers, a large decline in the strength of steel. 2. Shoddy steel exterior often Pock phenomenon. Pock is caused due to a serious groove worn steel surface uneven irregular defects. Due to the pursuit of profit and shoddy steel pipe manufacturers, often the most excessive rolling groove. 3. Shoddy steel surface is easy to produce scarring. There are two reasons: (1). Shoddy steel material uneven impurities. (2). Shoddy material manufacturers guides seamless steel pickling passivation poorly equipped, easy to stick steel, these impurities are prone to scarring after the roll bite. 4. Shoddy steel pipe diameter size fluctuations due; l, steel surface temperature instability of yin and yang. 2, the non-uniform composition of the steel. 3, due to poor equipment, low-intensity ground, rolling big bounce. There will be big changes in the same week 40cr seamless steel pickling, so easy to produce steel discontinuity break. 5 ,. Inferior surface material easy to crack because it is blank billet, billet cooling too, due to the process of thermal stress, cracks, crack 6. After rolling, there is a loose packing. Side of the oval. 40cr pickling seamless steel pipe industry virtues (certified), seamless steel pickling by virtue Liaocheng Industry Co., Ltd. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future. You can also access (www.meidegc.com/supply_details_47225925.html), for more information about the company.