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roughly speaking, seamless steel pipe manufacturing process starts with a solid, round steel billet. this billet is then heated to great temperatures and stretched and pulled over a form until it takes the shape of a hollow tube. it is different from the welded pipe which is produced by rolling a sheet of steel into a tube and welding the seam. traditionally, the seam of welded pipes has been viewed as a weak spot, vulnerable to failure and corrosion. the main perceived advantage of seamless pipes is that they don’t have a weld seam. hence the tensile strength of seamless steel pipe is uniform around the entire circumference of pipe. in that regard, seamless pipe can bear higher pressure than the welded steel pipe. today, this type of pipe has been widely used for pipelines around the world.
types and scope of seamless pipes bestar steel can provide:
api spec 5l/5ct | |||
product name | executive standard | dimension (mm) | steel code/ steel grade |
casting | api 5ct | 114-219 x 5.2-22.2 | j55, k55, n80, l80, p110 |
tubing | api 5ct | 48.3-114.3 x 3.2-16 | j55, k55, n80, l80, h40 |
casting | api 5l | 10.3-1200 x 1.0-120 | a, b, x42, x46, x52, psl1 / psl2 |
astm/asme | |||
product name | executive standard | dimension (mm) | steel code/ steel grade |
black and hot-dipped zinc-coated steel pipes seamless | astm a53 | 0.3-1200 x 1.0-150 | gr.a, gr.b, gr.c |
seamless carbon steel for high temperature service | astm a106 | 10.3-1200 x 1.0-150 | gr.b, gr.c |
seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes | astm a179 | 10.3-426 x 1.0-36 | low carbon steel |
seamless carbon steel boiler tubes for high pressure | astm a192 | 10.3-426 x 1.0-36 | low carbon steel |
seamless cold-drawn intermediate alloy steel heat-exchanger and condenser tubes | astm a199 | 10.3-426 x 1.0-36 | t5, t22 |
seamless medium-carbon steel boiler and superheater tubes | astm a210 | 10.3-426 x 1.0-36 | a1, c |
seamless ferritic and austenitic alloy steel boiler, superheater and heat-exchanger tubes | astm a213 | 10.3-426 x 1.0-36 | t5, t5b, t9 , t11, t22 ,t91 |
seamless carbon and alloy steel for mechanical tubing | astm a333 | 1/4″-42″ x sch20-xxs | grade 1, gr.3,gr.6, gr.8 , gr.9 |
seamless cold-drawn carbon steel feedwater heater tubes | astm a556 | 10.3-426 x 1.0-36 | a2, b2 |
for seamless ferritic alloy-steel pipe for high-temperature service | astm a335 | 1/4″-42″ x sch20-xxs | p5, p9 ,p11, p91, p22, p92 |
