Introduction Pipes are usually produced by two distinct methods which result in either a welded pipe or a seamless pipe. In both methods, raw material is first cast into ingots. It is then made into a pipe by stretching the steel out into a seamless tube or forcing the edges together and sealing them with a weld. Seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow pipe. The hollow pipe is then extruded through a die and mandrel combination to reduce the outside diameter and to expand the inside diameter. Seamless pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids.
Design Seamless tubes are typically more light weight, and have thinner walls. They are used for bicycles and transporting liquids. Certain pipe characteristics can be controlled during production. For example, the diameter of the pipe is often modified depending how it will be used. The diameter can range from tiny pipes used to make hypodermic needles, to large pipes used to transport gas throughout a city. The wall thickness of the pipe can also be controlled. Often the type of steel will also have an impact on pipe's strength and flexibility. Other controllable characteristics include length, coating material, and end finish.
Click Here to Read About Manufacturing Process of Seamless Pipes Click Here For Steel Seamless & Welded Pipes Price List 17 December 2018 List of Seamless Pipe Manufacturers Applications of Seamless Pipe 1. It can be used for structural applications. 2. It can be found in a wide range of applications such as in oil and gas, refinery, nuclear device, petrochemical, chemical, fertilizer, power, automotive, bearing, mechanical and structural, ship building and boiler industries.
ASTM Standards / Materials Used Product name Casting Tubing Casting
Product name
API SPEC 5L/5CT Executive Dimension Steel code/ Steel grade standard (mm) 114-219 x 5.2API 5CT J55, K55, N80, L80, P110 22.2 48.3-114.3 x API 5CT J55, K55, N80, L80, H40 3.2-16 10.3-1200 x A, B, X42, X46, X52, PSL1 / API 5L 1.0-120 PSL2 ASTM/ASME Executive Dimension
Steel code/ Steel grade
Black and Hot-dipped Zinc-coated Steel Pipes Seamless Seamless Carbon Steel for High Temperature Service Seamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes Seamless Carbon Steel Boiler Tubes for High Pressure Seamless Cold-drawn Intermediate Alloy Steel Heat-Exchanger and Condenser Tubes Seamless Medium-carbon Steel Boiler and Superheater Tubes Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heatexchanger Tubes Seamless Carbon and Alloy Steel for Mechanical Tubing Seamless Cold-drawn Carbon Steel Feedwater Heater Tubes For seamless ferritic alloy-steel pipe for high-temperature service
Product name Seamless Steel Tubes for Elevated Temperature Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements. Seamless steel tubes for pressure purposes
Hydraulic and pneumatic power system, low-voltage circuit, power
standard ASTM A53 ASTM A106
(mm) 0.3-1200 x 1.0-150 10.3-1200 x 1.0-150
ASTM A179
10.3-426 x 1.0-36
Low Carbon Steel
ASTM A192
10.3-426 x 1.0-36
Low Carbon Steel
ASTM A199
10.3-426 x 1.0-36
T5, T22
ASTM A210
10.3-426 x 1.0-36
A1, C
ASTM A213
10.3-426 x 1.0-36
T5, T5b, T9 , T11, T22 ,T91
ASTM A333 ASTM A556 ASTM A335
1/4"-42" x Grade 1, Gr.3,Gr.6, Gr.8 , Gr.9 SCH20-XXS 10.3-426 x A2, B2 1.0-36 1/4"-42" x P5, P9 ,P11, P91, P22, P92 SCH20-XXS
DIN/EN Executive Dimension standard (mm)
GR.A, GR.B, GR.C GR.B, GR.C
Steel code/ Steel grade
DIN 17175
St35.8,St45.8, 10CrMo910, 10-762 x 1.0- 15Mo3, 13CrMo44, 120 STPL340, STB410, STB510, WB36
DIN 1629
13.5-762 x 1.8-120
St37.0, St44.0, St52.0
4.0-60.0 x P235GH TC1, P235GH TC2, 0.5-8 16Mo3 5-7 m manufacturing length EN 10305 13.5-165.1 x St33.2 1.8-4.85 EN 10216
steering, fuel circuit, vibration reduction, and such. Specifies the Seamless steel tubes used 4.0-60.0 x DIN 2391 for Mechanical and Automobile. 0.5-8 13.5-165.1 x Seamless Steel Tubes DIN 2440 1.8-4.85
St35, St45, St52 St33.2
Characteristics/Features 1. Seamless pipe is thought to be able to withstand higher pressure, higher temperatures, higher mechanical stress and a corrosive atmosphere. 2. Hollow pipe is far stiffer per unit weight than solid members. 3. High precision can do small batch production. 4. Smaller diameter. 5. Weldability strong, high compression capability. 6. Steel pipe superior performance, relatively dense metal. 7. Steel Cross area is more complex. 8. High precision cold drawn products, good surface quality. 9. The thicker the wall thickness of the solution, it is really more cost effective and wise, the thinner the wall thickness, and its processing costs ill appreciate sharply. 10. From the process of the product determines its limitations, from the general seamless steel pipe with low accuracy: wall thickness uneven, low brightness tube appearance, fixed length of high cost, and pitting in the appearance of black spots is difficult to bring go; 11. Seamless steel pipe pressure and hydrostatic test is for pressure tube by into the hydrostatic test, which do not maintain the prescribed pressure value not less than 5 seconds, not to disclose, the regular supply hydraulic pressure test is 2.45MPa pressure The pressure test is P = 0.5MPa. 12. The corrosion test: industrial corrosion-resistant steel pipe according to standard regulations or agreement between the corrosion of steel pipe corrosion resistance test, no intergranular corrosion.
13. Seamless Pipes can be cold-drawn or hot rolled. Cold-drawn special-section seamless pipes are widely applied in the industries of petrochemical, boiler, automobile, mechanical, construction.
Advantages of Seamless Pipe 1. Increased Pressure Ratings. Welded seam of steel pipe is the weakest link. However, since the seamless steel pipe has not been welded, it does not have seams, making it equally strong around the entire circumference of the pipe. 2. Uniformity of Shape particularly on heavy wall sections and a lack of weld seams and increased structural integrity. 3. Strength Under Loads 4. There is greater ability to use multi-hole dies for diameter sizes that are smaller. This will decrease cost and increase productivity. There’s also better control of wall thickness.
Standard Pipe Sizes and Dimensions A Table of the Most Common Standard Pipe Sizes Nominal Bore 1/2 inch (DN 15 mm), Outside Diameter 21.34 mm Sch. Sch. Sch.16 Schedule STD XS XXS 5 10 0 Wall Thicknes 1.65 2.11 2.77 3.73 4.78 7.47 s (mm) Internal Diameter 18.04 17.12 15.8 13.9 11.78 6.4 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 3/4 inch (DN 20 mm), Outside Diameter 26.67 mm Sch. Sch. Sch.16 Schedule STD XS XXS 5 10 0 Wall Thicknes 1.65 2.11 2.87 3.91 5.56 7.82 s (mm) Internal Diameter 23.37 22.45 20.93 18.85 15.55 11.03 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS.
Nominal Bore 1 inch (DN 25 mm), Outside Diameter 33.40 mm Sch. Sch. Sch.16 Schedule STD XS XXS 5 10 0 Wall Thicknes 1.65 2.77 3.38 4.55 6.35 9.09 s (mm) Internal Diameter 30.1 27.86 26.64 24.3 20.7 15.22 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 1.5 inch (DN 40 mm), Outside Diameter 48.3 mm Sch. Sch. Sch.16 Schedule STD XS XXS 5 10 0 Wall Thicknes 1.7 2.8 3.7 5.1 7.1 10.2 s (mm) Internal Diameter 45 42.7 40.9 38.1 34 27.9 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 2 inch (DN 50 mm), Outside Diameter 60.3 mm Sch. Sch. Sch.16 Schedule STD XS XXS 5 10 0 Wall Thicknes 1.7 2.8 3.9 5.5 8.7 11.1 s (mm) Internal Diameter 56.9 54.7 52.5 49.3 42.9 38.1 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 3 inch (DN 80 mm), Outside Diameter 88.9 mm Sch. Sch. Sch.16 Schedule STD XS XXS 5 10 0 Wall Thicknes 2.1 3 5.5 7.6 11.1 15.2 s (mm) Internal 84.7 82.9 77.9 73.7 66.7 58.5
Diameter (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 4 inch (DN 100 mm), Outside Diameter 114.3 mm Sch. Sch. Sch.12 Sch.16 Schedule STD XS XXS 5 10 0 0 Wall Thicknes 2.1 3 6 8.6 11.1 13.4 17.1 s (mm) Internal Diameter 110.1 108.3 102.3 97.1 92.1 87.5 80.1 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 5 inch (DN 125 mm), Outside Diameter 141.3 mm Sch. Sch. Sch.12 Sch.16 Schedule STD XS XXS 5 10 0 0 Wall Thicknes 2.8 3.4 6.6 9.5 12.7 15.9 19 s (mm) Internal Diameter 135.7 134.5 128.1 122.3 115.9 109.5 103.2 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 6 inch (DN 150 mm), Outside Diameter 168.3 mm Sch. Sch. Sch.12 Sch.16 Schedule STD XS XXS 5 10 0 0 Wall Thicknes 2.8 3.4 7.1 11 14.3 18.3 22 s (mm) Internal Diameter 162.7 161.5 154.1 146.3 139.7 131.7 124.3 (mm) Schedule 40 has same dimensions as STD. Schedule 80 has same dimensions as XS. Nominal Bore 8 inch (DN 200 mm), Outside Diameter 219.1 mm Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Schedule Sch. 40 Sch. 60 XXS 5 10 20 30 80 100 120 140 160 Wall 2.8 3.8 6.4 7 8.2 10.3 12.7 15.1 18.2 20.6 23 22.2
Thicknes s (mm) Internal Diameter 213.5 211.5 206.3 205.1 202.7 (mm)
198.5
193.7 188.9 182.7 177.9 173.1 174.7
Nominal Bore 10 inch (DN 250 mm), Outside Diameter 273.0 mm Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Schedule Sch. 40 Sch. 60 XXS 5 10 20 30 80 100 120 140 160 Wall Thicknes 3.4 4.2 6.4 7.8 9.3 12.7 15.1 18.2 21.4 25.4 28.6 25.4 s (mm) Internal Diameter 266.2 264.6 260.2 257.4 254.4 247.6 242.8 236.6 230.2 222.2 215.8 222.3 (mm) Nominal Bore 12 inch (DN 300 mm), Outside Diameter 323.9 mm Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Schedule Sch. 30 Sch. 40 5 5 10 20 40 60 80 100 120 140 160 Wall Thicknes 4 4.2 4.6 6.4 8.4 9.5 10.3 14.3 17.5 21.4 25.4 28.6 33.3 s (mm) Internal Diameter 315.9 315.5 314.7 311.1 307.1 304.9 303.3 295.3 228.9 281.1 273.1 266.7 257.3 (mm) Nominal Bore 14 inch (DN 350 mm), Outside Diameter 355.6 mm Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Schedule Sch. 30 Sch. 40 XS 5 10 10 20 60 80 100 120 140 160 Wall Thicknes 4 4.8 6.4 7.9 9.5 11.1 12.7 15.1 19.1 23.8 27.8 31.8 35.7 s (mm) Internal Diameter 347.7 346 342.9 339.8 336.6 333.3 330.2 325.4 317.5 308 300 292.1 284.2 (mm) STD has same dimensions as Schedule 30. Nominal Bore 16 inch (DN 400 mm), Outside Diameter 406.4 mm Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Sch. Schedule Sch. 30 Sch. 40 5 10 10 20 60 80 100 120 140 160 Wall 4.2 4.8 6.4 7.9 9.5 12.7 16.6 21.4 26.2 31 36.5 40.5
Thicknes s (mm) Internal Diameter 398 396.8 393.7 390.6 387.4 381 373.1 363.5 354 344.5 333.4 325.4 (mm) STD has same dimensions as Schedule 30. XS has the same dimensions as Schedule 40.
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