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.
– 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.
– 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.
– 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.