Synthetic Graphite Electrodes

We are gaining our customers’ trust with high-precision processing.

What’s imperative in production of steel products by electronic furnace: electrodes. Among all, the solving process of scraps requires high-quality synthetic graphite electrodes with endurance against heat and impacts and low electronic registance.
Maruya Industry directly imports materials for synthetic graphite electrodes selected based on rigorous quality standards, precisely processes them at our domestic factories, and finish them up as final products with the high-quality Maruya brand, stably providing high-quality & low-cost products.
Maruya brand is there for high-quality synthetic graphite electrodes with our challenge to seek for higher quality still sustained, backed by the voice of our users.

Processing of synthetic graphite electrodes

Our company is the only maker in Japan specialized in processing of electrodes which imports materials for synthetic graphite electrodes from China / India and engages in cutting-out processing of the materials to make sockets and nipples.

●Applications: DC furnace, AC furnace, LF, etc.
●Size: diameter of 3”-22”, length of 30”-110”
●Advantages: reducing the number of accidents at connection points through high-precision screw processing, abundant inventories, customized processing catering to customers’ needs possible (hollow processing also possible)

Promising high endurance through processing with super-high precision

Our company has realized the reduction of contact resistance at poles and nipples to maintain the quality of synthetic graphite electrodes, stably providing products with attrition suppressed that can even endure intense convulsion.

Standard size of and weight of synthetic graphite electrodes
Nominal diameter External diameter of electrode Length of electrode Weight of electrode Taper nipple weight
diameter times length
inch
MAX
mm
MIN
mm
MAX
mm
MIN
mm
NP
kg
HP
kg
UHP
kg
kg
3x40 77 74 1,050 925 7 - - 0.1
4x40 102 99 1,050 925 13 - - 0.4
4x60 1,550 1,400 20 - -
5x30 131 128 800 675 17 - - 0.7
5x40 1,050 925 22 - -
5x60 1,550 1,400 33 - -
6x60 154 151 1,550 1,400 45 - - 1.1
7x60 179 176 1,550 1,400 59 - - 1.8
8x60 204 201 1,550 1,400 76 - - 2.5
8x72 1,900 1,700 92 - -
9x60 230 227 1,550 1,400 101 - - 3.8
9x72 1,900 1,700 122 - -
10x60 256 251 1,550 1,400 120 - - 5.2
10x72 1,900 1,700 145 - -
12x36 307 302 1,150 1,000 131 - - 8.0
12x60 1,550 1,400 177 190 -
12x72 1,900 1,700 215 230 -
14x60 357 352 1,550 1,400 230 245 - 14.7
14x72 1,900 1,700 287 295 305
14x84 2,225 1,975 - 343 355
14x96 2,525 2,275 - 390 400
16x60 409 403 1,550 1,400 - 310 320 20.6
16x72 1,900 1,700 - 375 395
16x84 2,225 1,975 - - 458
16x96 2,525 2,275 - - 521
18x72 460 454 1,900 1,700 - - 505 21.2

33.2(L)
18x84 2,225 1,975 - - 585
18x96 2,525 2,275 - - 665
20x72 511 505 1,900 1,700 - - 617 29.0

35.2(L)
20x84 2,225 1,975 - - 717
20x96 2,525 2,275 - - 822
22x84 562 556 2,225 1,975 - - 990 35.8
43.4(L)
22x96 2,525 2,275 - - 1,135
24x84 613 607 2,225 1,975 - - 1,040 40.6

48.4(L)
24x96 2,525 2,275 - - 1,190
24x110 2,900 2,550 - - 1,340

24” finished products are of China and India.

Standard size of nipple / socket of synthetic graphite electrodes
Screw nominal diameter Socket(mm) Nipple(mm) Pitch Distance between nipple edge
and socket bottom(mm)
Socket length buffer depth (mm)
3T4 46.04 76.20 6 41.10 6.35 3
4T4 69.85 101.60 6 53.80 6.35 3
5T4 79.38 127.00 6 66.50 6.35 3
6T4 92.08 139.70 6 72.85 6.35 3
7T4 107.95 165.10 6 85.55 6.35 3
8T4 122.24 177.80 6 91.90 6.35 3
9T4 139.70 203.20 6 104.60 6.35 3
10T3 155.57 220.00 10 116.00 8.47 3
10T4 152.40 190.50 10 101.30 6.35 3
12T3 177.16 270.90 10 141.50 8.47 3
12T4 177.80 215.90 10 114.00 6.35 3
14T3 215.90 304.80 10 158.40 8.47 3
14T4 203.20 254.00 10 133.00 6.35 3
14T3L 215.90 355.60 10 183.80 8.47 3
16T3 241.30 338.70 10 175.30 8.47 3
16T4 222.25 304.80 10 158.40 6.35 3
16T3L 241.30 355.60 10 183.80 8.47 3
16T4L 222.25 355.60 10 183.80 6.35 3
18T3 273.05 355.60 10 183.80 8.47 3
18T4 241.30 304.80 10 158.40 6.35 3
18T3L 273.05 457.20 10 234.60 8.47 3
18T4L 241.30 355.60 10 183.80 6.35 3
20T3 298.45 372.50 10 192.20 8.47 3
20T4 269.88 355.60 10 183.80 6.35 3
20T4L 269.88 457.20 10 234.60 6.35 3
22T4 298.45 355.60 10 183.80 6.35 6
22T4L 298.45 457.20 10 234.60 6.35 6
24T4 317.50 355.60 10 183.80 6.35 3
24T4L 317.50 457.20 10 234.60 6.35 3
Detail of screw up-and-down
人造黒鉛電極 ネジ山細部(ピッチ8.47mm)
人造黒鉛電極 ネジ山細部(ピッチ6.35mm)
Electric current capacity of synthetic graphite electrodes
Nominal diameter Maximum electric current(Amp)
inch mm NP HP UHP
8 200 7,000 - -
10 250 10,000 - -
12 300 13,000 17,000 -
14 350 18,000 24,000 36,000
16 400 - 31,000 45,000
18 450 - - 50,000
20 500 - - 61,000
22 550 - - 68,000
24 600 - - 80,000
Main characteristics of synthetic graphite electrodes
Nominal diameterCharacteristics 70~350
3"~14"
400~450
16"~18"
500~600
20"~24"
NP HP UHP NP UHP UHP
Bulk density g/㎝3 Electrode
Nippie
1.58-1.65
1.65-1.75
1.64-1.74
1.72-1.82
1.65-1.74
1.72-1.85
1.64-1.73
1.72-1.82
1.65-1.74
1.73-1.85
1.64-1.71
1.73-1.85
Specific resistance μΩm Electrode
Nippie
8.5-9.0
6.5-7.5
4.5-7.0
4.0-6.0
4.5-6.2
4.0-5.0
5.8-7.0
4.0-6.0
4.5-6.0
3.6-4.5
4.5-6.0
3.6-4.5
Young's modulus Gpa Electrode
Nippie
5.6-10.0
11.0-15.0
7.0-11.0
11.0-16.0
9.0-14.0
12.0-18.0
7.1-10.0
11.0-16.0
9.0-14.0
12.0-20.0
9.0-13.0
12.0-20.0
Resistance against bending Mpa Electrode
Nippie
10.0-12.5
12.0-16.0
11.0-14.5
12.0-17.0
10.5-16.0
17.0-20.0
9.8-14.0
12.0-17.0
9.0-14.0
17.0-22.0
9.0-13.0
17.0-22.0
Thermal expansion coefficient x10-6/℃ Electrode
Nippie
2.2-2.8
2.2-2.8
2.0-2.1
2.0-2.1
0.8-1.5
0.5-1.0
2.0-2.1
2.0-2.1
0.3-1.2
0.1-0.5
0.3-1.2
0.1-0.5
Ash Electrode
Nippie
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下
0.3以下

Imported products

We also deal with finished products for which the cutting-out processing of the materials to make sockets and nipples is already done by Chinese / Indian makers.

人造黒鉛電極 輸入製品の取扱
人造黒鉛電極 輸入製品の取扱

Regenerative processing of broken / damaged electrodes.

We will accept the regenerative processing of electrodes broken / damaged in operation.
Such regenerative processing has both a pattern to cut the length and one to inch down the diameter, with damaged electrodes reusable that would be otherwise scrapped for recarburizer.
*Contact us first as there are some conditions for such regenerative processing.

折損電極の再生加工前
折損電極の再生加工後

Processing for anti-oxidization

We will accept processing for anti-oxidization.
The attrition by oxidization of electrodes will be reduced by coating their surface with anti-oxidization liquid, depending on the situation of your furnace.

  • Attrition by oxidization reduced
  • Unit efficiency increased
  • Unit cost decreased

Electrodes are to be immersed into vacuum impregnation equipment with anti-oxidization liquid to form the anti-oxidization layer on their surface.

Such anti-oxidation is expected to suppress attrition by oxidization of electrodes in arch furnaces with a high oxidization ambience with light work within them or on the furnaces (the effect will differ depending on the situation of your furnace).

酸化防止処理

Special carbon products

We also deal with special carbon products used for graphite crucibles, etc. other than synthetic graphite electrodes.

特殊炭素製品
特殊炭素製品

Inquiry / quote

Don’t hesitate to contact us for inquiries / quotes on our products such as synthetic graphite electrodes (*quotes offered for free).

By phone: +81-93-522-56088, Sales Section。

Company name:
Person in charge:
Mail address:
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HP:http://maruya-corp.co.jp

TEL:+81-93-522-5608
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