igh temperature PWHT softening and production method thereof
A steel plate and fire-shaped technology, which is applied in the field of normalized steel plates for pressure vessel shells, can solve the problems of structural degradation, increased processing and production costs, and unsuitable high-temperature resistant PWHT low-alloy vessel steel plates.
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[0063] The chemical composition of embodiment is shown in Table 1, manufactures according to the following steps:
[0064] TDS molten iron deep desulfurization→converter smelting→LF→RH (Si-Ca wire feeding)→die casting→slab off-line finishing→slab cutting to length→heating→thermomechanical rolling (TMR)→steel stack slow cooling / Pit slow cooling→AUT / MUT→Steel edge trimming, head and tail cutting→Rough shot blasting to remove scale on the steel plate surface→Normalizing heat treatment (N)→Sampling and performance testing (including sample simulation PWHT)→Cut to length steel plate →Surface quality and appearance size, identification and inspection →Factory.
[0065] The technological parameters of the embodiment are shown in Table 2, and the performance parameters are shown in Table 3.
[0066] see figure 1 It can be seen that the structure of the steel plate of the present invention is uniform and fine equiaxed ferrite grains + metamorphic pearlite + granular bainite + a smal...
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