The production process of general seamless steel pipes can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is generally more complicated than that of hot rolling. The tube billet must first be subjected to three-roll continuous rolling, and then it must be processed after extrusion. In the sizing test, if the surface does not respond to cracks, the pipe will be cut by a cutting machine and cut into a blank of about one meter in length. Then enter the annealing process. Annealing needs to be pickled with acidic liquid. When pickling, pay attention to whether there is a lot of blistering on the surface. If there is a lot of blistering, it means that the quality of the steel pipe does not meet the response standard. In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes. Much rough, without too many burrs. The delivery state of hot-rolled seamless steel pipes is generally delivered after heat treatment in the hot-rolled state. After the quality inspection, the hot-rolled seamless steel pipe must be strictly hand-selected by the staff. After the quality inspection, the surface must be oiled, and then followed by multiple cold drawing experiments. After the hot rolling treatment, the piercing experiment must be carried out. , If the perforation diameter is too large, straightening should be carried out. After straightening, it is transported by the conveyor to the flaw detector for flaw detection experiment. Finally, the label is attached, the specifications are arranged, and then placed in the warehouse.
Seamless steel tube weight formula
[(Outer diameter-Wall thickness)*Wall thickness]*0.02466=kg/m (weight per meter)
Quality requirements for seamless steel pipes
A) Seamless steel pipe
1. Uses: Seamless steel pipe is a kind of economic section steel, which has a very important position in the national economy. It is widely used in petroleum, chemical industry, boilers, power stations, ships, machinery manufacturing, automobiles, aviation, aerospace, energy, geology, construction and Various departments such as military industry.
①According to the shape of the section: circular section tube, special-shaped section tube
②According to material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite pipe
③According to the connection mode: threaded connection pipe, welding pipe
④According to the production method: hot rolled (extruded, topped, expanded) tube, cold rolled (drawn) tube
⑤According to purpose: boiler pipe, oil well pipe, line pipe, structural pipe, fertilizer pipe…
3. Production processes
①Main production process of hot-rolled seamless steel pipe (△main inspection process):
Tube billet preparation and inspection △→tube billet heating→perforation→tube rolling→pipe reheating→fixed (reduced) diameter→heat treatment△→finished pipe straightening→finishing→inspection△(non-destructive, physical and chemical, bench inspection)
②Main production process of cold rolled (drawn) seamless steel pipe:
Blank preparation → pickling and lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection
ASTM A53 pipe is US petroleum pipeline standard pipe. The pipe is widely used in the extraction of oil, gas, water field. The end can be flat, threaded, coupling, socket connection.
Type of ASTM A53 Steel Pipes
F: Furnace and butt welded with continuous welded grade A
E: ERW pipe with Grade A & B
Specifications of ASTM A53 Steel Pipes
Specifications of ASTM A53 Steel Pipes
|SMLS ASTM A53 Pipe||Grade A||Grade B|
|Tensile Strength, min, psi||48,000||60,000|
|ASTM A53 SMLS Pipe||C max %||Mn max %||P max %||S max %|
|Grade A||Grade B||Grade A||Grade B||Grade A||Grade B||Grade A||Grade B||Grade A||Grade B||Grade A||Grade B||Grade A||Grade B||Grade A||Grade B|
ASTM A53 Grade B Pipe available sizes
|Pipes Size||Schedule||Wall Thickness||Weight/ft||OD||ID|
ASTM A53 pipe schedule chart
|Nominal||Pipes size||OD mm||Schedule 20||Schedule 30||Schedule STD||Schedule 40||Schedule 60||Schedule Extra||Strong (XS)|
Carbon Steel A53 Grade B Pipe Equivalent Grades
- Equivalent Standard: EN 10216-2, DIN 17175, BS 3602 Part I, NF A 49-215, NBR 6321
- Equivalent Material:8, 1020, 410, 1.0405, HFS 430, TU 42-c
Equivalent Piping connection for SA 53 Gr.B
|Material||Pipes||Fttg||Flg||Valves||Bolts & Nuts|
|Carbon Steel||A53 Gr A||A234 Gr WPA||A105||A216 Gr WCB||A193 Gr B7|
A194 Gr 2H
|A53 Gr B||A234 Gr WPB||A105||A216 Gr WCB|
|A53 Gr C||A234 Gr WPC||A105||A216 Gr WCB|
Steel Pipe End Finish
There are five common type of metal pipe end finishes;
- Threaded and Coupled
- Threaded without Coupling
- Plain End – Cut Square
- Beveled for Welding – 30 deg bevel
- Grooved End – Cut or rolled for mechanical coupling
A 53 is a general steel pipe spec which covers galvanized pipe and black pipe. It is available in Type S (seamless), Type E (ERW, electric resistance welded longitudinal seam), and Type F (furnace welded).
A106 Gr. B is intended for high temperature service (up to 750 Deg F). It just applies to seamless steel pipe with killed steel. Pipe of NPS 1 1/2” and under may be either hot finished or cold drawn. Unless specified, pipe on and over NPS 2″ shall be furnished hot finished, while A53 and API 5L are not.
API 5L Gr. B (PSL-1) is mainly developed for Line pipes used in conveying gas, oil, and water in oil and gas industry. Either seamless steel pipe or welded pipe is OK.