(57) The method of manufacturing a long-life heat-resisting low alloy steel welded component,
with which creep damages do not easily occur in the heat affected zone. The manufacturing
method includes the steps of subjecting a base metal containing, at % by weight, C:
0.15% or less, Si: 0.5% or less, Mn: 0.3 to 0.8%, Cr: 1.9 to 2.6%, Mo: 0.87 to 1.20%,
and a balance of iron and unavoidable impurities, to a hot working (S3), to a heat
treatment (S5), and then to a welding (S8). In this method the base metal is normalized
(S2) once or more times before the welding (S8) in addition to the hot working (S3).
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