The Steel/ Cast-Iron Melting Module

The aggregate utilized to melt steels and cast irons, the laboratory instruments as well as the equipment utilized to carry out examinations and tests allow a large range of steel castings (parts and ingots) as well as cast-iron castings to be fabricated.

The melting furnaces and laboratory and control equipment permit a large range of steel and cast iron grades to be produced:

Melting Module Equipment:
• Electric  – arc furnaces; capacity: 3t; 5t; 8t.
• Graphite blasting system afferent to the electric furnaces
• Casting ladles for argon barbotage using porous plug
• VODC – equipment (vacuum oxygen decarburization converter) capacity 8t – 12t

Control and laboratory equipment :
• 
Electronic balances afferent to the rolling platforms used for casting
• Electro – Nite – immersion  thermocouples
• X ray fluorescence spectrometer to analyze the chemical composition
• LECO analyzer to  determine the % of C and S
• LECO analyzer to  determine the H2 content
• LECO analyzer to  determine the O2 and N2 content
• Physical and mechanical test laboratory

The VODC equipment was purchased in 1995 f rom the ALD Vacuum Technologies GmbH. This equipment is Available for sale

Treating the liquid steel is performed into a converter blowing oxygen and refining under vacuum (0.5 + 0.8 mbar). Argon barbotage applied simultaneously.

Technological Possible Procedures of the VODC

STEEL: electric – arc furnace; electric furnace+ argon barbotage; electric furnace+ VODC- VD; electric furnace+ VODC- VOD.
CAST IRON: electric furnace+ graphite injection; induction furnace; electric arc furnace+ induction furnace.

ADVANTAGE
– high degree of gas content reduction (H2; N2; O2)
– elimination of impurities
– content less than 0.01 % of S
– low carbon content steel melting
– high degree of chromium regeneration for high alloy steel

Steel for  Castings

Unalloyed steels – according to: SR ISO 3755, STAS 600, ASTM A216 – WCA, WCB, WCC, ASTMA352-LCA, LCB LCC -API600
Low alloy steel and alloy steel – according to: SR /SO 9477, SIAS  1779 ASTM A 487 requirements; 45k, 60k, 75k type steel – API Spec.64; firm standards.
Mn and Mn-Si steel -wear resisting parts rollers gears sprockets bucket teeth, links,  etc.
Cr-Ni-Mo Steel
– highIy stressed parts : drilling  hooks crankshafts ;
– tight parts resisting  pressure values up to  1,050 bar and used  for bodies, covers  and bonnets of valves, etc.
– parts resisting low temperature values of ,-45″C  and-60″c.
– parts resisting to sulphide  stress corrosion under  H2S environments.
Steel  tested in accordance with the NACE – MR – 01- 75 (type 60k) requirements

Stainless steels and alloy steel according to the ASTM A217 requirements CA 15; C5; WC6;WC9 used for  parts working under  environmental conditions  containing high H2S and C02 concentration values.

Refractory steels, for transport gratings and other components utilized under high temperature conditions.

Manganous  steels (Hatfield) 1 2+ 1 4%Mn  • wear resistant parts

Steels for Forging  lngots

Polygonal  ingots of  2,65t  to  8,60t  directly poured  or  poured in syphon, argon – splashed or vacuum treated  steel;  the steel brands cover the range of all carbon steels to the high alloy ones.

Cast Iron
– grey cast iron and grey cast iron of high resistance
– phosphorous alloyed grey cast iron for railway wagons -chromium – alloyed refractory cast iron
– nodular cast iron-SR EN 1563;firm standards
– alloyed grey cast iron for die black
– alloyed grey cast iron resistant to pressure.