High Temperature Resistant Slag Pot Casting Ladle Slag Transfer Container
Materials
The pot body is made of cast steel DICAST, a ZTIC brand for castings: the material is similar to A27/A 27M grade 65-35 (April 2003), BS 3100 A1/A2 (January 1991) or DIN 17182 grade GS 20Mn5 (May 1992). DICAST is a fully killed steel, vacuum degassed and machined to a fine grain structure with increased toughness and elongation.
Except for supplying the trunnion forgings and designing the moulds, all other processes are carried out in the company's in-house foundry.
Molding is carried out separately in modular sandboxes using a resin-bonded sand mould process.
Trunns, if present, are preferably cast: they are usually made from steel S355 J2G3, but can also be supplied as cast or hot-fitted trunnions. Melting is carried out in an oxygen steelmaking plant (two 180 ton BOF converters); the ladle capacity allows a continuous bottom pouring process with permanently controlled pouring speed. Metal composition analysis is checked with a computer-connected spectrometer.
Heat treatment
Each casting pot undergoes a composite quality heat treatment (annealing) aimed at grain refinement and stress relief, namely:
- Heating to a temperature above AR3, austenitizing at about 915°C and controlled cooling in the furnace
- Holding between 600°C - 630°C and cooling to 300°C in the furnace for furnace cleaning and finishing
The inner surface is specially treated to completely remove surface defects that could cause slag adhesion. In addition, the castings are shot peened for descaling and the outside is additionally coated for transportation.
The surface quality results from the manufacturer's comprehensive practices and complies with the requirements of MSS SP-55-1996 (Method for visual assessment of surface irregularities).
Quality Assurance
The manufacturing process follows the provisions of the implemented ISO 9001: 2000 quality system.
Standard documentation ensures full traceability of each process step:
Manufacturer test certificate in accordance with DIN EN 10.204 § 3.1, including chemical composition, mechanical properties and non-destructive testing;
Dimensional inspection, with "as-built" sketch;
High-quality heat treatment records;
Documentation required by Machinery Directive 2006/42/EC (where applicable).
Product Parameters
Manufacturing
Except the supply of the forgings for trunnions and the engineering of the pattern, all further operations
are carried-out at the in-house foundry plant. |
Moulding
the castings are manufactured in a workman-like manner as required in the China standard DIN EN
1599-1: August 1997, ruling the delivery conditions ofcastings. The moulding is individually carried
out within a modular flask by using a sand preparation based on resin bonding. |
Trunnions
the trunnions - when any - are preferably cast-in:they are as a rule manufactured from the steel
material S355 J2G3 to DIN EN 10250-2: December1999 and forged as per DIN 7527 February 1975.
Cast-on or hot-fitted trunnions can be also provided. |
Melting
the melting is carried out in the oxygen steel plant ( 2 off 180 t BOF converters ); the ladle capacity
allows a continuous bottom pouring process the speed of which is permanently controlled. The metal
analysis is checked by using a computer linked spectrograph. |
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