Studded Tubes

Product Specification
Tube OD:	25mm to 273mm	1" to 10" (NPS)
Tube WT:	3.5mm to 28.6mm	0.14" to 1.1"
Tube Length:	28000mm max	92ft max
Stud Diameter:	6.0mm to 25.4mm	0.23" to 1"
Stud Height:	10mm to 35mm	0.40" to 1.38"
Stud Pitch:	8mm to 30mm	0.3" to 1.2"
Stud Shape:	Cylindrical, Elliptical, Lens type
Stud to tube surface angle: Vertical or angular

 

Material
Tube Material:	Carbon Steel: most common grade is SA106Gr.B Stainless Steel: most common grades are TP304, TP316, TP321, TP347, 2205 Alloy Steel: most common grades are T5, T9, T11, T12, T22, T91, P5, P9, P11, P12, P22, P91
Stud Material:	Carbon Steel: most common grade is Q235B Stainless Steel: most common grades are TP304, TP316, TP321, TP347, TP409, TP410, 2205 Alloy Steel: (specification available upon request)

* This table is used as a general guide to our capabilities, please contact us for any other customized cases.

 

Welding Process
The steel studs are automatically resistance welded to the tube, producing high quality forge welds. Our automatic studding machines are capable of handling tube diameters from 38mm to  273mm (1.5" to 10") o/d and stud diameter from 6mm to 25.4mm (0.23" to 1").
The welding process enables the combination of any grades for studs and tube: carbon, alloy, stainless steels and high nickel alloys. Alloy steel pipes are stress-relieved after studding, according to the relevant specifications for the class and grade of steel used.
Production Capacity
Total four PLC automatic ERW studding lines, monthly production capacity is 5000000 studs in total.
The automatic stud feeder was developed by our engineers combining both our large experience manufacturing extended surface and the most modern control technology available in the market. The technology has benefited us with more efficient production and consistent welding quality.
Codes and Standards

1. SH/T 3422-2011 Technical Specification for Stud Tubes of Tubular Heater in Petrochemical Engineering
2. According to Client's Requirements or Technical Agreement if any

Surface Treatment and Protection
Each tube and stud except stainless material will be polished by polishing machine to near bright condition before welding. After welding, the studded tubes will be coated with anti-rust oil for transportation and site storage purpose, normally the coat will provide a period of 3 months prevention, any other coating material for longer prevention is also available as per clients' requirements.