Method for increasing low-temperature impact energy of nuclear reactor pressure vessel steel large-scale thick-wall forged piece
A technology for pressure vessels and nuclear reactors, applied in the field of heat treatment of steel, can solve the problems of deterioration of low-temperature toughness, microstructure differences, etc., and achieve the effects of improving low-temperature impact toughness, good mechanical properties, and high use safety margin value.
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[0060] The method for improving the low-temperature impact energy of large thick-walled forgings of nuclear reactor pressure vessel steel according to the present invention is suitable for thick-walled forgings with a material of SA-508Gr.3Cl.1 steel and a quenched and tempered wall thickness of 200-280mm, including the following steps:
[0061] The first step is to smelt steel ingots;
[0062] The composition of the steel ingot is (in this article, all are mass percentage content):
[0063] C: 0.18~0.20%,
[0064] Mn: 1.40~1.50%,
[0065] P≤0.008%,
[0066] S≤0.005%,
[0067] Si: 0.25~0.40%,
[0068] Ni: 0.80~0.95%,
[0069] Cr≤0.25%,
[0070] Mo: 0.45~0.50%,
[0071] V≤0.05%,
[0072] Al: 0.020~0.030%,
[0073] N: 0.020~0.030%,
[0074] O≤0.003%,
[0075] H≤0.0002%;
[0076] The ASME SA508 / 508M (2004 edition) standard has provisions on the composition of SA-508Gr.3Cl.1, but the specified composition range is too wide, and the hot working characteristics of forgings that fluctuate within its rang...
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