Jul 11 2010
SECO WARWICK Allied has recently commissioned (4) cracked ammonia atmosphere annealing bases with a capacity of 30,240 MTPA for Jindal Stainless, Hissar, India. This installation includes (2) gas-fired heat hoods or bells, (4) annealing bases each with base valve stand, (4) corrugated inner covers, (2) air/water spray cooling, common pressure reducing station for utilities and complete PLC-based control system. This equipment was in addition to (4) existing bases previously installed by SECO WARWICK Allied.
The charge material is hot rolled strip coils of grade 430, 409M, 410, 420J and 439 stainless steel with a maximum outer diameter of 1,800 mm and width range of 900-1300 mm. Each annealing base is designed for a maximum load of 54 MT and reference charge load of 45 MT.
The designed overall stack height is 4,100 mm for 3 coils per batch of maximum width. The coils are stacked using intermediate convectors between each coil. The furnaces are designed for a high temperature, with gas temperature control of 850 deg. C. The thickness of the coil strip to be annealed ranges between 3 - 6 mm.