http://www.chinachunkang.com/steel-pipe/ thick wall steel pipe material ASTM A106B, ASTM A53B, ST52, ST37,ST44,ST45,stpg370 Production processRound billet 鈫?heating 鈫?perforating 鈫?three-roll diagonal rolling, continuous rolling or extrusion 鈫?pipe shedding 鈫?sizing (or reducing the diameter of BAI) 鈫?cooling 鈫?straightening 鈫?hydrostatic test (or flaw detection) 鈫?marking 鈫?warehousing Description Seamless steel tubes are generally used It is made of 10, 20, 30, 35, 45 high quality carbon bonded steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled.10, 20 and other low carbon steel manufacturing seamless pipe is mainly used for fluid transport pipelines.45, 40Cr and other medium carbon steel seamless pipe to manufacture mechanical parts, such as cars, tractors stressed parts.Generally use seamless steel tube to ensure the strength and flattening test.Hot rolled steel tubes are delivered in hot rolled or heat treated state;Cold rolling delivered in heat treatment condition. FAQQ: Are you trading company or manufacturer ? A: We are factory. Q: How long is your delivery time? A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity. Q: Do you provide samples ? is it free or extra ? A: Yes, we could offer the sample for free charge but do not pay the cost of freight.Q: What is your terms of payment ? A: Payment=1000USD, 30% T/T in advance ,balance before shippment. Packaging & Delivery Packing: 1. In bundle with strip 2. By PP Woven material and anti-water plastic 3. As the customer's requirment. Port: Tianjin,Shanghai,Guangzhou,Qingdao,etc Lead time: customersSo far we have our customers spreaded in America,Europe, Middle east etc... certificate Mill Test Certificate, C/W Certificate (Calibration Works Certificate) EN 10204 3.1, DIN 50049 3.1, ISO 10474 3.1, NACE MR0103/NACE MR0175/ISO 15156, PED-97/23/EC, AD-2000-WO, with 3.2 certificate duly Certified &Approved by LRS, GL, BV, DNV, ABS, SGS, TUV, RINA, IRS, NORSOK, etc. After sale service Be all promise best quality,competitive price and professional service. 1.Free sample is available. 2.Mill Test Certificate is supplied with shipment. 3.The third party inspection is accepted.China Steel Pipe factory website:http://www.chinachunkang.com/steel-pipe/