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Doosan IMGB
Reactor Vessel Upper Shell
In the ‘80s, former IMGB was a significant nuclear components and equipment supplier for the domestic and East-European countries (American/Canadian and Russian standards), but this production ceased.

After almost 20 years, in 2009, based on an important investment plan, Doosan IMGB began the manufacturing of belt and shell forgings with the support and know-how provided by Doosan Heavy Industries & Construction – Forgings & Castings Business Group.

Special attention was paid to staff training. The success of our first forging and the evidence of the high technological progress made in such a short time (three years) after the company was taken over by Doosan encouraged us to believe that Doosan IMGB is capable of coping with the severe requirements of the international market.

Belt & Shell Forgings Typical Shape & Size

Belt & Shell Forgings Typical Shape & Size

1. Ring /Belt Type Forgings As Rough Forged Size:

 DT(mm)HWt
(metricTon)
Min 1,500 250 400 15
Max 6,500 - 1,300 140

1. Ring /Belt Type Forgings As Rough Forged Size:

2. Shell Type Forgings As Rough Forged Size:

 DT(mm)HWt
(metricTon)
Min 1,500 250 1,500 -
Max 6,500 - 3,500 140

At this moment, we have the capacity and capability to produce belt and shell forgings for pressurized and reactor vessels or heat exchangers within the size range above mentioned. The maximum capacity is now of about 40 pieces per year. Materials vary from C-Mn to Mn-Ni-Mo steels as per ASME standards (e.g. grades according to SA508, SA516, SA533). Other belt or shell forgings shapes, dimensions and corresponding weights may be produced after Doosan IMGB – Process Engineering Team assessment for feasibility based on specific drawings and material standards.

Typical Manufacturing & Inspection Operations Sequence of Belt and Shell Forgings

Belt & Shell Forgings Typical Shape & Size

  • Remark:
    Upon request, when feasible and technically reasonable, changes may occur, but the customer shall be charged with the cost of additional operations or supplementary material requirements, if any.

New quality heat treatment facilities have been built especially for nuclear belt and shell forgings production: car-bottom, gas-fired furnace with automatic control (10mWx10mLx6mH, 250metricTon max. load, 1100°C max.temperature) and water-immersion quenching tank (max. 6.5mDia., 8m depth, 200metricTon max. load).

 

Machining is performed on NC vertical lathes: 4xShibaura (max. 6mDia.x3mH, 150metricTon max. load), 1xBerthiez (max. 6mDia.x4mH, 150metricTon max. load), 1xShibaura (max.12mDiax5mH, 400metricTon max. load) other machining facilities are available by outsourcing.