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Seamless steel pipe 15




Allowable stress of 108x6 seamless steel pipe / gb8163-87 seamless steel pipe under pressure
How is pressure calculated for seamless steel tubes (calculate)? One: Knowing the outside diameter (outer edge diameter) specifications of seamless steel tubes and specifications (wall thicknesses) to find the pressure calculation method (method)
(The tensile strength of different materials of steel pipes is different) Pressure = (wall thickness * 2 * tensile strength of steel pipe materials) / (outer diameter (outer edge diameter) * coefficient) 2: Knowing that seamless pipes are seamless Steel tube outer diameter and pressure to calculate wall thickness (calculate) method: wall thickness = (pressure * outer diameter * coefficient) / (2 * steel pipe material tensile strength) three: steel pipe pressure coefficient expression method: pressure P 7Mpa factor S = 87 <steel pipe pressure P <17.5 factor S = 6 pressure P> 17.5 factor S = 4
Seamless steel tube spot
89 × 4.5-8--18-2095 × 4.5-6-8--16-20102 × 4.5-5--12-14-16-20 108 × 4.5-5-10-12-14-18-20- 22114 × 4.5-5--12-14-18-20121 × 4.5-5--12-14-16-20127 × 4.5-5-10-12-14-16-20133 × 4.5--14-16-18 -20-25-301 (permanent redirect) 40 × 5-6-7-12-14-16-20-22146 × 4.5-6-16-18-20-25-30152 × 4.5-6--16- 18-20-25-30159 × 4.5-6—14-16-22-25-30168 × 8-14-20-25-30-30-35 Permissible stress steel pipe wall thickness (method) has the pipe table number, Three methods of steel wall thickness and tube weight Sch10
S, Sch40
S, Sch80s four grades; 2) Expressed in terms of steel pipe wall thickness China, IS
O. Some Japanese steel pipe standards are adopted. 3) Pipe wall thickness is expressed by the weight of the pipe. It divides the pipe wall thickness into three types: A. B. Standard weight tube, expressed as STD. B. Thick tube, expressed as XS Extra thick pipe, indicated by XXS. B3087 seamless steel pipe is divided into seamless steel pipe for structure according to use; seamless steel pipe for transportation; seamless steel pipe for boiler; high pressure seamless steel pipe for boiler. GB9948 seamless steel pipe seamless steel pipe is expressed as outer diameter, wall thickness, and thickness. Wall seamless steel pipe is mainly used for machining, coal mine, hydraulic steel, etc. For pipes with DN≤250mn, Sch40 is equivalent to STD, for pipes with DN <200mm, Sch80 is equivalent to XS. Supplement: 1. The wall thickness series is indicated by the pipe table number (Sch.). This is stipulated by the American National Standards Association ANSIB36.10 (welded and seamless steel pipe) standard in 1938. The pipe table number (Sch.) Is the ratio of the design pressure to the allowable stress of the material at the design temperature (value obtained by comparing the two numbers) by 1000, and rounded After the value. I.e. Sch. = P / [ó] t × 1000
(1-2-1) In the formula, P—Design pressure, MPa; [ó] t—Allowable stress of material at design temperature, MPa. The pipe number of seamless steel pipe and welded steel pipe can be determined by checking the data (Means). The pipe table numbers in ANSI B36.10 and JIS standards are: Sch10, 20,
30, 40, 60, 80, 100, 120, 140, 160. Stainless steel (stainless acid-resistant steel) pipe in ANSI B36.19 The pipe number is: 5
S, 10
S, 40
S, 80S. GB9948 seamless steel pipe is divided into high pressure seamless steel pipe for fertilizer equipment according to the purpose; seamless steel pipe for geological brick exploration; seamless steel pipe for petroleum brick exploration; seamless steel pipe for petroleum cracking; seamless steel pipe for ships; cold drawn cold rolled precision Seamless steel pipes; various alloy pipes. The tube table number (Sch.) Is not a wall thickness, but a wall thickness series. The actual wall thickness, the same pipe diameter, its thickness varies in different pipe table numbers. The pipe wall thickness of different pipe table numbers is calculated in the United States and Japan using the Barlow formula for calculating the thickness of thin-walled pipes subjected to internal pressure, and takes into account the corrosion margin, thread depth, and negative deviation of wall thickness -12. Determined after 5%, as shown in formulas (1-2-2) and (1-2-3). tB = D0P / 2 [ó] t
(1-2-2) t = [D0 / 2 (1-0.125) × P / [ó] t] +2.54
(1-2-3) where tB and t——represent the theoretical and calculated wall thickness, mmD0——outer pipe diameter (outer edge diameter), mmP——design pressure, MPa [ ó] t——The allowable pressure of the material (Material) at the design temperature (MPa) is the actual wall thickness after calculating the wall thickness and diameter.



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