METHOD FOR COMPLEX THERMAL PROCESSING OF LARGE-SIZED FORGED PIECES Russian patent published in 2004 - IPC

FIELD: thermal processing of large-sized forged pieces and blanks for reactor casings of water-cooled nuclear power plants, petroleum-chemical reactors and other large-sized equipment.

SUBSTANCE: method involves thermal processing of large-sized forged pieces and blanks having weight of up to 250 t from Cr-Mo-V composition steels and steels of said composition with admixtures of Ni in an amount of ~ 2% for preventing development of defects, such as flakes and cracks, and providing for required strength and plasticity level, as well as for reducing level of initial critical fraility temperature T_cf and reducing of critical fraility temperature shift as a result of radiation ΔTf owing to elimination of large-sized and differently sized grains resulting from multiple heating procedures and different forging reduction ratios during plastic deformation; providing fine-grained tempered bainite-martensite structures of homogeneous section.

EFFECT: improved quality of steel structure resulting in increased service life, power and safety level of large-sized equipment manufactured from such steel.

2 dwg, 1 tbl