300MM diameter 10mm thick q345b sae1518 st52 a52 grade b material black iron seamless round steel tube pipe

1. chemical composition and technicial property

2.  OD: 6MM-800MM

3.  WT: 0.5MM-60MM      

4. Length: 6 meters- 12000 meters         

5. Heat treatment:  Quenched and tempered ; Double Normalized and Tempered; Normalized

6. Cut to order and cut to size, any size is available 

 7. Chemical composition and Mechanical property

2. pipe picture

3. seamless steel pipe grades can be supplied

Seamless Steel pipe grades

4. seamless pipe production procedure and methods:

1. Hot rolled seamless steel pipe 

using hot rolled steel pipe billet to make heating and piercing, elongating, sizing and stranghtening, cooling, finally hollow bars finished, this is the type most commonly used. Because it is hot rolled, so cost is lowest, but it is suit for large quantity, for small quantity, have to make cold drawn or round bar piercing. size: outer diameter 32mm- 499mm, wall thickness 4mm- 80mm

2. Cold drawn seamless steel pipe

 for outer diameter not over than 63.5mm, small size hollow bar, when demanded quantity is under 5 tons, usually make cold drawn hollow bar, using larger size hot rolled hollow bar to draw to the size demanded.

some size can be finished only by one time drawing, but some other sizes might need twice or three times to finish drawing, it takes time, so the cost is higher.

cold drawn size outer diameter 16mm- 63.5mm

3. Hot- expanding seamless steel piper

 For hollow bar sizes are special, not common sizes, have to use smaller thick wall hollow bar to hot expand to be larger size hollow bar, but the technical property for hot-expanded hollow bar will be lower than the original hollow bar. Size: outer diameter over 356mm.

5. seamless pipe detail:

6. seamless steel pipe stock picture:

7. steel pipe fabrication picture

steel pipe tube bending

steel pipe welding

8. name cards