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Seamless Steel Pipe

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Seamless pipe sizes
1/2” Nominal to 24”O.D. Seamless Pipe

Wall Thicknesses – Schedule 40 up to 4.000”


Standard of carbon seamless steel pipe

ASTM A53 Gr.B Black and hot-dipped zinc-coated steel pipes welded and seamless
ASTM A106 Gr.B Seamless carbon steel for high temperature service
ASTM SA179  Seamless cold-drawn low-carbon steel heat exchanger and condenser tubes
ASTM SA192  Seamless carbon steel boiler tubes for high pressure
ASTM SA210  Seamless Medium-carbon boiler and superheater tubes
ASTM A213 Seamless alloy-steel boiler, superheater, and heat-exchanger tubes
ASTM A333 GR.6 seamless and welded carbon and alloy steel pipe intended for use at low temperatures.
ASTM A335 P9,P11,T22,T91
Seamless ferritic alloy-steel pipe for high-temperature service
ASTM A336 
Alloy steel forgings for pressure and high-temperature parts
ASTM SA519 4140/4130 Seamless carbon for mechanical tubing
API Spec 5CT J55/K55/N80/L80/P110/K55 Seamless steel pipe for casing
API Spec 5L PSL1/PSL2 Gr.b, X42/46/52/56/65/70 Seamless steel pipe for line pipe
DIN 17175 Seamless steel tube for elevated temperture
DN2391  Cold drawn seamless prevision pipe
DIN 1629 
Seamless circular unalloyed steel tubes subject to special requirements



Application of seamless pipe
Low temperature service pipes
Tubes for mechanical and structural
Tubes for fluid transportation
Ship building tubes
Bearing pipes
Line pipes used in sour service
Tubes for pressure services
Pipe for high temperature
Honed tube
Boiler tubes
Heat exchanger tubes
Marine seamless steel pipe
Tubes for mechanical and automobile


Condition on delivery of seamless pipe

Cold-finished/hard (cold-finished as-drawn)
BK
No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.

Cold-finished/soft (lightly cold-worked)
BKW
After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.

Annealed
GBK
After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.

Normalized
NBK
The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.


Manufacturing Process

Billets and coils are delivered to the pipe mill ready to be made into carbon steel pipe. Depending on the capabilities of the pipe mill and the end use of the final product, the casts will be formed into pipe by means of four distinct different manufacturing.Seamless carbon steel pipe has, as its name implies, no longitudinal weld seam. It is, in essence, one solid homogeneous piece of steel. A solid billet is simply heated and then stretched over a series of mandrels until the pipe has achieved its desired diameter and wall thickness.


Cold drawn seamless tube

Cold Drawn Seamless Mechanical Tubing (CDS) is a cold drawn 1026 steel tube. Produced from piercing hot rolled bar stock, the cold drawing process increases the tube's physical properties reducing the cost of machine time. Cold drawn seamless tubing provides a better uniformed OD and ID, enhanced machinability, increased strength, and tighter tolerances compared to hot finish seamless products.


Made from 1026 steel
Meet ASTM A519
Stocked size range: 1.500”OD – 14.000” OD; .250” wall – 1.25” wall
Stocked lengths 17’-24’
Cut to length service available


Hot Finished Seamless Mechanical Tubing (HFS) is a 1020/1026 carbon seamless mechanical steel tube commonly produced from a rotating heated bar and pierced to create a hollow tube. HFS tubing is a cost effective alternative to cold drawn seamless tubing with just a broader tolerance range on the outside diameter (OD) and inside diameter (ID). Hot Finished Seamless mechanical tubing is manufactured to OD and wall dimensions.

HFS tubing is made from 1020/1026 Steel
Meets ASTM A519 & A106 standards
Stocked Size Range: 3.00" OD - 26.000" OD; 0.500" wall - 4.000" wall
Stocked Lengths 17'-40'
Cut to length service available


Packages of seamless pipe

Bundled package

On bundle of steel tube shall be the same in batch number, steel grade and specification.the rest of tubing less than one bundle should be tied into small bundles. The weight of each bundle should be less than 50kg.The max weight cannot exceed 80kg of the bundle If there are special requirements. When the length of the steel tube is greater than or equal to 6m, with at least 8 strapping bands for each bundle, divided into 3 groups and 3-2-3. When the length of the steel tube is less than 6m, and each bundle is tied at least 5 knots and divided into 3 groups, which are 2-1-2.
When the length of the tube is greater than or equal to 3m, and each bundle is tied with at least 3 bands, divided into 3 groups, 1-1-1 showed below

Wooden box package

The wooden box is suitable for cold rolling or cold drawing seamless steel tube, polished hot rolled stainless steel tube. When the outer diameter of steel pipe is greater than or equal 10mm, the maximum weight of the container should be 50kg. When the outer diameter of steel pipe is less than or equal 10mm, the maximum weight of the container should be 30kg.