Quality Inspection for Lf Graphite Electrodes With Nipples - HP 350mm Graphite Electrode – Hexi

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Quality Inspection for Lf Graphite Electrodes With Nipples - HP 350mm Graphite Electrode – Hexi Detail:

350-3
350-2

HP graphite electrode is mainly made of petroleum coke and needle coke, It is capable of carrying the current density 18-25A/cm2. Generally it is designed for high power electric arc furnace steel-making.

Allowable current load for ultra-high power graphite electrodes
nominal diameter	allowable current		nominal diameter	allowable current
mm	A	A/㎡	mm	A	A/㎡
250	9000～14000	18～25	500	38000～55000	18～27
300	15000～22000	20～30	550	45000～65000	18～27
350	20000～30000	20～30	600	52000～78000	18～27
400	25000～40000	16～24	650	70000～86000	21～25
450	32000～45000	19～27	700	73000～96000	18～24

Ultra high power graphite electrode and joint standard
items		unit	nominal diameter（mm）
items		unit	250～400	450～550	600～700
specific resistance	electrode nipple	μ Ω•m	4.8～5.8 3.4～4.0	4.5～5.6 3.4～3.8	4.5～5.4 3.0～3.6
transverse strength	electrode nipple	MPa	≥12.0 ≥22.0	≥12.0 ≥22.0	≥10.0 ≥24.0
elastic modulus	electrode nipple	GPa	≤13.0 ≤18.0	≤13.0 ≤18.0	≤13.0 ≤20.0
灰分 ash content	electrode nipple	%	≤0.2	≤0.2	≤0.2
bulk density	electrode nipple	g/m³	1.68～1.73 1.78～1.84	1.68～1.72 1.78～1.84	1.68～1.72 1.80～1.86
（C.T.E)	electrode nipple	10℃	≤1.2 ≤1.0	≤1.2 ≤1.0	≤1.2 ≤1.0

mm	A	A/㎡	mm	A	A/㎡
250	9000～14000	18～25	500	38000～55000	18～27
300	15000～22000	20～30	550	45000～65000	18～27
350	20000～30000	20～30	600	52000～78000	18～27
400	25000～40000	16～24	650	70000～86000	21～25
450	32000～45000	19～27	700	73000～96000	18～24

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Graphite Electrode Joint