ASTM A672 LSAW Steel Pipe

 

A672 straight seam pipe is an American standard steel pipe made by electric fusion welding for moderate temperature and high-pressure applications. It is commonly used for transporting high-pressure gases, liquids, steam, and other fluids, as well as for conveying gas, natural gas, oil products, and chemicals.

A672 LSAW Welded Pipe Specification

Standard	ASTM A672
Grade	Grade A45,A55,B60,B65,etc.
OD	406-1422.40mm
WT	1.65-40mm
Length	6mtr-20mtr
Ends	Beveled/Threaded Ends
Coating	3PE Coating;3PP Coating;FBE Coating;Epoxy Coating;Special Painting
MOQ	3 Tons

A672 Welded Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Non-Destructive Testing of A672 Straight Seam Steel Pipe

1. Basic Requirements for the Appearance of Straight Seam Steel Pipe Welds
Before performing non-destructive testing on straight seam steel pipes, the weld appearance inspection should meet the following requirements. The appearance and surface quality of the straight weld seams used for pipe joints should generally comply with the following:
- The welding shape should be good, with a width of 2mm covering both sides of the groove. The height of the fillet weld should comply with design specifications, and the shape should transition smoothly.
- Weld Surface:
(1) Cracks, lack of fusion, slag inclusion, and spatter are not allowed.
(2) For steel pipes with a design temperature below -29 degrees Celsius and stainless steel pipes with a high hardening tendency, the weld surface must not have undercut. For other related materials, the undercut depth should be greater than 0.5mm, with the continuous length of the undercut not exceeding 100mm, and the total length of the undercut on both sides of the weld should not exceed 10% of the total weld length.
(3) The weld surface should not be lower than the pipe surface, with the height of the weld reinforcement not exceeding 3mm.
(4) The misalignment of welded joints should not exceed 10% of the wall thickness and should not exceed 2mm.

2. Surface Non-Destructive Testing
The choice of surface non-destructive testing methods for straight seam steel pipes follows these principles: magnetic particle testing is used for ferromagnetic steel pipes, and penetrant testing is used for non-ferromagnetic steel pipes.
For weld joints prone to hot cracks, an important surface non-destructive test should be conducted both after welding and after heat treatment. For weld joints prone to delayed cracking, surface non-destructive testing should be conducted after a certain cooling period.
Surface non-destructive testing should be carried out according to standard requirements. The objects and applications of surface non-destructive testing are generally as follows:
(1) Quality inspection of the pipe's outer surface.
(2) Inspection of surface defects in important butt welds.
(3) Surface defect inspection of important fillet welds.
(4) Surface defect inspection of important socket weld and branch weld joints in crossover tees.
(5) Groove inspection of weld joints with a high hardening tendency.
(6) Inspection of grooves in non-austenitic stainless steel pipes with a design temperature lower than or equal to -29 degrees Celsius.
(7) Inspection of double-sided welds after cleaning.

3. X-ray and Ultrasonic Testing
The main objects of X-ray and ultrasonic testing are the butt joints of straight seam welded steel pipes and the butt joints of welded pipe fittings.
Weld seams that are prone to delayed cracking after welding should undergo X-ray and ultrasonic testing after a certain cooling period. When there are circumferential welds on the main pipe inside the casing, the weld seam should undergo 100% X-ray testing, and only after the test pressure is qualified can hidden operations be performed.
Weld joints covered by reinforcing rings or support pads on the pipeline should undergo 100% radiographic inspection, and only after passing can they be covered again. Scheduled intermediate NDT inspections of weld seams include visual inspection, radiographic inspection, and ultrasonic testing of the surface NDT. Weld seams must be evaluated and passed before further welding.

 

Hot Tags: astm a672 lsaw steel pipe, China astm a672 lsaw steel pipe manufacturers, suppliers, S275JR ERW pipe, 304 Stainless Steel Round Tube, high alloy steel, LSAW welded pipe, ERW welded pipe, heating pipes