ASTM1018 forged bars , AISI 4145 H MOD , 4142 , 4137H, 4130 , A335
P11 , P22 forgings
Quality control
6.1 ultrasonic flaw detection (provide test report)
The entire volume of each hollow tube shall be subject to 100%
ultrasonic inspection in accordance with the following conditions,
in accordance with ASTMA388 hollow tube 1/4" flat bottom hole
(defect equivalent).
6.2 surface test (provide test report)
Surface defects of each centralizer shall be detected after the
final heat treatment and machining
The detection method is: magnetic particle detection
Acceptance criteria: no cracks, scars, white spots, folds and other
surface defects, no repair welding allowed.
6.3.1 hardness test
6.3.1. A) hardness (provide test data record report)
(three points are taken at 90° intervals in the circumference of
the small table). The total number of points is 12.
6.3.1. B) perform surface hardness test for each heat treatment
batch and each specification.And record the test results.
6.3.2: grain size: (ASTM112) grain size ≥ grade 5
Inclusion: conforms to ASTME45 (JK)
Coarse: A≤2.5;B 2.0 or less;C 1.5 or less;D 2.0 or less;
6.3.3 tensile test: perform a tensile test for each heat treatment
batch.(sampling and testing shall be confirmed by party a on site)
6.3.4 impact test: three impact tests shall be conducted for each
heat treatment batch.(sampling and testing shall be confirmed by party a on site)
6.4 dimension inspection: dimension inspection shall be carried out
for each centralizer.Inner diameter tolerance +1.6/0mm (according to drawing size
tolerance)
Vii. Marking: mark a. furnace ingot number in this order before
leaving the factory;B. Factory number;C. steel grade.
Viii. Shipping mark: A4 paper shall be printed in color and pasted
on the outer packing surface.
9. Packaging and transportation: a. The product shall be wrapped
with plastic film in the inner layer and covered with colored strip
cloth externally.Use the thick Angle steel frame with a bottom not more than 5mm to
support and fix, rubber gasket at the clamp (for the purpose of
strong and stable packaging), the packaged products should not
swing;B. The product shall be packed to meet the requirements of land,
sea and loading;C. Please indicate the net weight, gross weight and overall
dimensions (length X width X height) of each piece.
