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Heat Treatment
1.All castings shall be heat treated either by full annealing,normalizing,normalizing and tempering,or quenching and tempering.Unless otherwise specified in the inquiry,contract,or order,the castings may be heat treated by any of these heat treatments or combination of these heat treatments at the option of the manufacturer.
2.Heat treatment shall be performed after the casings have been allowed to cool below the transformation range.
Charpy Impact Requirements
1.This section is applicable only to grades 165-150L[1140-1035L[,210-180L[1450-1240L],and 260-210L[1795-1450L].
2.The impact properties of each heat,for investment castings,each master heat,shall be determined by testing one set of three Charpy V-notch impact specimens at -40℃ ± 2°F [-40°±1℃].The eergy value of the three specimens shall not be less than shown in Table 3.
3.Test coupons and specimens shall conform to the requirements specified in Section 11.
4.Impact test specimens shall be machined to the form and dimensions shown in Test Methods and Definitions A370,Charpy V-notch specimen,Fig.11 and tested in accordance with those test methods.
Repair by welding
1.Weld repairs shall be inspected to the same quality standards that are used to inspect the castings When castings are are produced with Supplementary Requirements S1 specified,weld repairs shall be inspected by magnetic particle examination to the same standards that are used to inspect the castings.When castings are produced with Supplementary Requirements S2 specified,weld repairs in which the depth of the cavity perpared for repair welding exceeds 20% of the wall thickness or 1 in.[25 mm],whichever is smaller,or in which the cavity prepared for welding is greater than approximately 10 in2.[65 cm2],shall be radiographed to the same standards that are used to inspect the castings.
Retests
If the results of the tensile or charpy tests do not conform to the requirements specified,heat-treated castings may,at manufaturer's option,be reheat treated.Testing after reheat treatment shall consist of the full number of specimens complying with the specification or order.
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