graphite electrode scrap/graphite electrode pieces

graphite electrode scrap/graphite electrode pieces, graphite electrode scrap/graphite electrode pieces,

DESCRIPTION

UHP graphite electrode is used for the recycling of steel in the electric arc furnace industry. Its main ingredient is high-value needle coke which is made from either petroleum or coal tar. Graphite electrodes are finished with a cylinder shape and machined with threaded areas at each end. In this way, the graphite electrodes can be assembled into an electrode column using electrode nipple. In order to meet the requirement of higher work efficiency and lower total cost, large capacity ultra-high power arc furnaces are becoming more and more popular. Because of this, UHP graphite electrodes with diameters of over 500 mm will dominate market.

FEATURE

Withstand large currents, high discharge rate. Good dimension stability, not easy to deform. Resistant to cracking & spalling. High resistance to oxidation and thermal shock. High mechanical strength, low electrical resistance. High machining accuracy, good surface finishing.

APPLICATION

Graphite electrodes are widely used for production of alloy steels, metal and other nonmetallic materials, etc. DC electric arc furnace. AC electric arc furnace. Submerged arc furnace. Ladle furnace.

SPECIFICATION

Table 1: Technical Specification of UHP Graphite Electrode

Dia.	Resistance	Density	Flexure Strength	Elastic Modulus	Ash Content	CTE	Current Load	Current Density
(inch)	(≤, µΩ·m)	(≥, g/cm3)	(≥, MPa)	(≤, GPa)	(≤, %)	(100 °C – 600 °C)	(A)	(A/cm2)
						(≤, 10-6/°C)
10	5.2	1.67	10.5	14	0.3	1.5	8100–12200	20–30
12	5.2	1.70	10.5	14	0.3	1.5	15000–22000	20–30
14	5.2	1.70	10.5	14	0.3	1.5	20000–30000	20–30
16	5.2	1.70	10.5	14	0.3	1.5	25000–40000	19–30
18	5.2	1.70	10.5	14	0.3	1.5	32000–45000	19–27
20	5.2	1.70	11	14	0.3	1.4	38000–55000	18–27
22	5.2	1.72	11	14	0.3	1.4	42000–66000	17–26
24	4.8	1.72	11	14	0.3	1.4	49000–76000	17–26

Table 2: Graphite Electrode Size & Tolerance

Diameter (mm)					Length (mm)
Nominal Diameter		Actual Diameter			Nominal Length	Tolerance	Short Length
(inch)	(mm)	(max.)	(min.)	(rough spot)
10	250	256	251	248	1600/1800	±100	-275
12	300	307	302	299	1600/1800
14	350	357	352	349	1600/1800
16	400	409	403	400	1600/1800/2000/2200
18	450	460	454	451	1600/1800/2000/2200
20	500	511	505	502	1800/2000/2200/2400
22	550	562	556	553	1800/2000/2200/2400
24	600	613	607	604	2000/2200/2400/2700

SURFACE QUALITY

There should be less than two defects or holes on the electrode surface, the maximum size of which is mentioned in the below chart. There should be no transverse crack on the electrode surface. For the longitudinal crack, the length should be less than 5% of the electrode circumference and the width should be 0.3 to 1.0 mm. The width of black area on electrode surface should be less than 1/10 of the electrode circumference and the length should be less than 1/3 of the electrode.

SpecificationDefect Dimension	Nominal Diameter of Graphite Electrode (mm)
	300–400	450–600
Diameter (mm)	20–40	30–50
	(< 20 mm should be negligible)	(< 30 mm should be negligible)
Depth (mm)	5–10	10–15
	(< 5 mm should be negligible)	(< 10 mm should be negligible)