Surface Defects

Outside surface breaking defects:

the outside surface of each standard steel bar or tube shall be inspected for defects. the preferred methods are either the Ultrasonic (UT) or Magnetic Particle (MT) methods. As an option, other methods (such as eddy current) may be used, providing it can be demonstrated that the system and procedure are capable of detecting indications described in Table A.16.

Inside surface breaking defects:

the inside surface of each tube shall be inspected for defects by the ultrasonic (UT) angle-beam (shear wave) method. this requirement applies only to materials that are identifiable as tubes before heat treatment. Materials that are heat-treated are not considered tubes, for inspection purposes.

Delivery Conditions: forged piece, rough machined (Q&T), finish machined.

Specifications:

-Type: Integral straight or spiral blade stabilizer
-Material: AISI 4145H MOD or Non-magnetic steel
-OD: 6''~28''
-Length: max 9m
-Standard: API SPEC 7-1( or as your requested technical requirement)
-Process: EAF+LF/VD+(ESR)+Forged + Heat treatment + Rough machining
-Surface finishing: Black, Peel, Turned, Polished
-Delivery condition: Hot forged, Heat treatment(Q+T), Rough machining
-Blade: normal 3~4 blades