The difference between seamless steel pipe and ordinary steel pipe

- Feb 23, 2021-

Seam steel pipes are divided into cold-drawn and hot-rolled, but the surface has not been treated. There are several types of 

Seam steel pipes are divided into cold-drawn and hot-rolled, but the surface has not been treated. There are several types of seamless steel pipes. 

In terms of its material and implementation standards, the materials include ordinary pipes and alloy pipes. 

seamless steel pipe

The implementation standards are

  1. For seamless steel pipe: GB8162-99 

2. Ground seam steel pipe for conveying fluid: GB8163-99 

3. Seamless steel pipe for boiler: GB3087-1999 

4. High pressure seamless pipe for boiler: GB5310-95 (ST45.8-ⅲ type) 

5. High-pressure seamless steel pipe for fertilizer equipment: GB6479-1999 

6. Seamless steel pipe for geological drilling: YB235-70 

7. Seamless steel pipe for petroleum drilling: YB528-65 

8. Seamless steel pipe for petroleum cracking: GB9948-88 

9 , Petroleum drill collar special seamless pipe: YB691-70 

10. Seamless steel pipe for automobile axle shaft: GB3088-1999 

11. Seamless steel pipe for ship: GB5312-1999 

12. Cold drawn cold-rolled precision seamless steel pipe: GB3639-1999 

13. Various alloy pipes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo steel pipes are divided into seamless steel pipes and welded steel pipes according to different production processes. Seamless steel pipes are seamless steel pipes made by perforating steel ingots, tube blanks or steel bars; welded pipes are made by welding hot-rolled or cold-rolled steel plates and steel strip coils, and can be welded longitudinally or spirally.


Product Description
MaterialQ195, Q235, Q345; ASTM A53 GrA,GrB; STKM11,ST37,ST52, 16Mn,etc.
Wall Thickness0.7MM~30MM
LengthLength:Single random length/Double random length
5m-14m,5.8m,6m,10m-12m,12m or as customer's actual reques
StandardJIS G3466, EN 10219, GB/T 3094-2000, GB/T 6728-2002
GradeGrade A, Grade B, Grade C
Section ShapeSquare, Rectangular, Round,
TechniqueSpiral Steel Pipe
PackingBundle, or with all kinds of colors PVC or as your requirements
EndsPlain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc.
MOQ1 Tons, more quantity price will be lower
Surface Treatment1. Galvanized
2. PVC,Black and color painting
3. Transparent oil,anti-rust oil
4. According to clients requirement
Product Application:1. Fence, greenhouse, door pipe,greenhouse
2. Low pressure liquid, water, gas, oil, line pipe
3. For both indoor and outdoor the building construction
4. Widely used in scaffolding construction which is much cheaper and convenient
OriginShandong OF China
CertificatesAPI ISO9001-2008,SGS.BV
Delivery TimeUsually within 10-45 days after receipt of advance payment
Packing&Delivery

1).20ft GP:5898mm(Length)x2352mm(Width)x2393mm(High)

    20 Feet Container:Load about 26 tons steel pipe, length under 5.8 meter.

2).40ft GP:12032mm(Length)x2352mm(Width)x2393mm(High)

    40 Feet Container: Load about 26 tons steel pipe, length under 11.8 meter.

3).40ft HC:12032mm(Lengh)x2352mm(Width)x2698mm(High)

    Bulk Vessel: Special length over 12meter, big quantity products, sea freight is cheap.

4) Lead Time: within 10-25 workdays normally
5) Packing: Standard seaworthy packing or as per your request .(as pictures)

Production ProcessOur certification

Our company has established good relations with other domestic steel mills, like wusteel, baosteel, ansteel, and  also have cooperation with foreign steel mill, We have our own quality management systems, strictly control purchases, produce, sales, warehouse and transport processes.

Customer Visit

Our high quality materials and products are widely used in construction equipment, handling equipment,  coal mining, power plant, cement plant, construction machinery, steel construction, container, ship, iron art etc.

Our products have been highly praised by our clients from Europe, America, the Middle East, African and Southeast Asia. We will offer competitive products and comprehensive service to customers.