Seamless Steel Pipe Introduction:
Standard: DIN 2391, EN 10305-1, EN 10305-4
Steel grade:ST30Al, ST35, ST37, ST37.4, ST45, ST54
Delivery condition: BK, NBK, GBK
Seamless Steel Pipe SURFACE TREATMENTS
1. Bare Tube (No coating): Bright and smooth, Surface Roughness both inner and outer surface  0.2Ra Maximum for special requirement
2. Surface Coating
 A. Silver galvanized
 B. Yellow galvanized
 C. Olive green coated
Layer thickness: 8-20um, Salty Spray Test: 48-150 hours
3.  Black phosphate
Seamless Steel Pipe TEST CERTIFICATIONS
Testing:
All the tubes are checked by Eddy current test and are submitted to a visual and dimensional control before transport.
Tubes are supplied with certificates acc. to EN10204 type 3.1.B: certificates