ASTM A372 A372M-20,Standard Specification for Carbon and Alloy Steel Forgings for Thin-Walled Pressure Vessels.
ASTM A372 A372M-20 covers relatively thin-walled forgings (including gas bottles) for pressure vessel use.
Magnetic Particle Examination
All quenched and tempered forgings shall be subject to magnetic particle examination after heat treatment. The methods used shall be in accordance with Practice A275/A275M.
Only direct current or rectified alternating (full or halfwave) current shall be used as the electric power source for any of the magnetizing methods.
The forgings shall be free from linear indications indicative of cracks. In case of doubt as to the type of condition giving rise to linear magnetic particle indications, they may b einspected for Type II indications referenced in Reference Photographs E433 when inspected by the liquid penetrant method in accordance with Practice E165/E165M.Alternatively, some other suitable method for classifying the indications may be used as agreed upon between the manufacturer and the purchaser.
Workmanship
If the thickness of a portion of the wall of a forging is less than that specified, the forgings may be accepted by the purchaser, provided that such irregularity will not require lowering the allowable working pressure below that for which the forging was designed.
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