ASTM B283:19 pdf download

ASTM B283:2019 pdf download.Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed).
S 1. Supplementary Requirements S I, S2, and S4 of ASTM B2491B249M shall apply.
S2. Identification Marking—Individual forgings shall be marked with the producer’s name or trademark, this ASTM specification number, the UNS number, and the heat number or serial number. The method and location of marking shall be in accordance with MIL-STD-792. If approved by the purchaser, the forgings may be bundled or boxed and each bundle or box provided with a metal or oil-proof tag showing the above in format ion.
S2.1 Sampling—The lot size, portion size, and selection of sample pieces shall be as follows:
1. Lot Size—For forgings weighing 250 lbs 1114 kg] or less, a lot shall he 2(XX) lbs [909 kg] or less, and shall consist of forgings of the same design and alloy forged from the same material heat and heat treated at the same time. For forgings exceeding 250 lbs [114 kg], each individual forging shall constitute a lot.
S2.2 Portion Size—For forgings less than 250 lbs 1114 kg], two forgings per lot shall be selected for tensile testing. Tensile tests shall be performed on each forging over 250 lbs LI 14 kg].
S2.3 chemical Analysis—If heat identification is required, one sample for chemical analysis shall be taken for each heat at the time of pouring or from semifinished or finished product.
S2.4 Tensile Thsting—The tensile specimens shall be taken from integral forging prolongations or shall be removed from the forgings by trepanning. Alternatively, samples may be taken from separately forged test bars of the same heat as the forgings in the lot provided the wall thickness and amount of working for the test bar are equivalent to those for the forgings. The axis of the tensile specimen shall be located at any point midway between the center and the surface of solid forgings and at any point midway between the inner and outer surfaces of the wall of hollow forgings, and shall be parallel to the direction of greatest grain flow to the greatest extent possible.
S2.5 Liquid Penetrant Inspection—When specified by the purchaser, each piece of each lot shall be inspected in accordance with NAVSEA T9074-AS-GIB-l01/271.
S2.6 Ultrasonic Inspection—When specified by the purchaser. each piece of each lot shall be inspected.
1. General Requirements—Ultrasonic testing shall be performed in accordance with NAVSEA T9074-AS-GIB- 101/271. Acoustic compatibility between the production material and the calibration standard material shall he within 75 %. If the acoustic compatibility is within 25 %, no gain compensation is required for the examination. If the acoustic compatibility difference is bctwecn 25 and 75 %, a change in the gain or dB controls shall be accomplished to compensate for the differences in acoustic compatibility. This method cannot be used if the ultrasonic noise level exceeds 50 % of the rejection value.
S3. Calibration.