ASTM1018 forged bars , AISI 4145 H MOD , 4142 , 4137H, 4130 , A335 P11 , P22 forgings
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.