PRODUCTS

Cast and pig iron

Ferroalloys

Graphite and graphite electrodes

• Graphite electrodes dia 100
• Graphite electrodes dia 150
• Graphite electrodes dia 200
• Graphite electrodes dia 250
• Graphite electrodes dia 300
• Graphite electrodes dia 75
• Graphite foundry black GLS1
• Graphite silver casting GL1

Modifiers for steel and cast iron

Non-ferrous metals

Graphite electrodes EG/RP with a diameter of 250 mm and nipples for them are made on the basis of petroleum and needle cokes and coal tar pitches. These products are used in arc steelmaking furnaces, refining, ferroalloy furnaces, ore thermal and other electrical installations.

The technology for manufacturing graphite electrodes includes the preparation of raw materials - crushing and calcination, mixing fillers with pitch and molding, firing, impregnation, graphitization and mechanical processing. For the production of pressed blanks, extrusion and vibration molding methods are used.

Electrodes are produced with a diameter of 75-600 mm and a length of up to 2400 mm. There are sockets at both ends of the electrode with cylindrical or conical thread for screwing in the nipple. The nipple is necessary for extending the electrode as it is consumed during the steelmaking process.

Each electrode is equipped with a nipple. At customer's request, nipples can be supplied separately from electrodes or in addition to the kit.
Electrodes with a diameter of 250 mm and nipples for them are made with conical threads.
In order to eliminate the unwinding of the conical nipple connection during vibration of the electrodes in the furnace, the nipples to electrodes can be made with grooves and equipped with locking plugs or locking paste.

Technical characteristics	Unit	Typical values for electrode	Typical values for nipple
Diameter Diameter	mm	250	-
Volume density Apparent density	g/cm3	1.58	1.67
Content of ash impurities Ash content	%	0.5	0.3
Electrical resistance Electrical resistance	µOhm•m	8.0	7.0
Thermal coefficient of linear expansion, (20-520)°C CTE coefficient	10-6 •1/°С	2.8	2.7
Mechanical bending strength limit Bending Strength	MPa	10.2	14.2
Elasticity modulus (Young's) Modulus of elasticity	GPa	9.1	12.0

ГОСТ 57613-2017 (387 Кб)

Metallurgical company "Mitra" LLC offers from stock Graphite electrodes dia 250 at a negotiated price.