Graphite Electrodes

Contributing to an Environmentally Friendly Society and Supporting Steel Making

Worldwide Reputation as a Pioneer of Large-Diameter Electrodes

In 1962, SEC CARBON succeeded in commercially producing graphite electrodes with a 24-inch diameter, the world's largest size at that time. Since then, SEC CARBON has built inherent trust as a pioneer of large-diameter electrode production. Our development capability and product quality have been widely recognized not only in Japan but also in the overseas market including the United States, Europe and rapidly growing Asian countries.
Not content with the current situation, however, we continue our efforts to make significant contributions to the industry for energy cost reduction and productivity improvement through our high-quality graphite electrodes.

Technical Supports Proven by Broad Experience

Conducting technical discussions with customers throughout the world, SEC CARBON delivers graphite electrodes with optimum quality for users' needs.

Our indisputable technical support system is also one of the reasons why SEC CARBON has been able to establish the current position in the industry. We not only provide a wide range of products but also we are putting our focus on technical supports so that we can provide electrodes with optimum quality for operational conditions of individual customers.

Overseas Sales Network

Graphite electrodes from SEC CARBON are active in countries all over the world.

Asia
China, Korea, Taiwan, Thailand, Malaysia, Singapore, Indonesia, Philippines, India, Turkey, Iran, Saudi Arabia, Vietnam
Europe
Germany, Italy, Russia, Slovakia, Switzerland, Portugal, Azerbaidzhan
The Americas
USA, Venezuela, Mexico, Argentina
Oceania
Australia
Africa
Egypt
Where are Graphite Electrodes used?
Used as electrodes in Electric Arc Furnaces (EAF) for steelmaking
EAF produces construction materials such as wide flange beams and rebars by melting steel scrap with electricity. The demand for the larger diameter electrodes has been increasing as EAF furnace sizes become larger. SEC CARBON always takes the lead in the development of large size electrodes. Today our electrodes are used in EAFs all over the world.
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Typical Properties

  AC
furnace		 DC
furnace
Nominal
diameter		 mm 150～
250		 300～
400		 450～
800		 450～
800
inch
(reference
value)		 6～
10		 12～16 18～32 18～
32
Grade   Regular
power		 Regular
power		 High
power		 High
power		  
Ash
content %		 0.2
or less		 0.2
or less		 0.2
or less		 0.2
or less		 0.2
or less
Real density
g/cm3		 2.21-
2.24		 2.22-
2.25		 2.22-
2.25		 2.22-
2.25		 2.22-
2.25
Bulk density
g/cm3		 1.58-
1.70		 1.58-
1.70		 1.66-
1.80		 1.65-
1.75		 1.66-
1.75
Total
porosity ％		 23-
29		 23-30 19-26 21-27 21-
26
Bending
strength		 MPa 8.8-
13.7		 7.8-12.7 10.8-18.6 9.8-14.7 9.8-
14.7
(kgf/cm2) 90-
140		 80-130 110-190 100-150 100-
150
Young's
modulus		 GPa 7.8-
11.8		 6.8-10.8 9.8-15.7 8.8-12.7 8.3-
12.7
(kgf/mm2) 800-
1,200		 700-
1,100		 1,000-
1,500		 900-
1,300		 850-
1,300
Specific
resistance
μΩm		 5.5-
7.9		 5.5-7.9 4.3-6.5 4.5-6.0 4.4-
5.5
Coefficient of
thermal expansion
10-6/℃		 1.1-
1.7		 1.1-1.7 0.9-1.7 0.8-1.5 0.8-
1.3

Current Carrying Capacity

Standard Sizes and Weights

Nominal
diameter
mm (inch)		 Electrode Nipple Standard packing
Diameter mm Nominal
length
mm		 Length mm Standard
weight
kg		 Standard
weight
kg		 Package
number		 Total weight
after packing
kg		 Packing dimension
(pallet) mm
width × height × length
Maximum Minimum Maximum Minimum High
power		 Regular
power		 3TPI 4TPI
800（32） 816 810 2,700 2,900 2,550 2,450     128* 1 2,600 820×920×3,200
750（30） 765 761 2,700 2,900 2,550 2,139     108* 1 2,270 770×870×3,200
700（28） 714 710 2,700 2,900 2,550 1,852     85*
72		 2 3,894 1,430×830×3,200
2,400 2,525 2,275 1,572   3,330 1,430×830×2,800
2,100 2,225 1,975 1,410   3,010 1,430×830×2,500
600（24） 613 609 2,700 2,900 2,550 1,382     51*
41		 2 2,880 1,230×720×3,150
2,400 2,525 2,275 1,186   2,490 1,230×720×2,750
2,100 2,225 1,975 1,047   2,210 1,230×720×2,450
550（22） 562 556 2,400 2,525 2,275 986   37 44*
36		 2 2,080 1,120×650×2,750
2,100 2,225 1,975 918   1,940 1,120×650×2,450
1,800 1,900 1,700 752   1,610 1,120×650×2,150
500（20） 511 505 2,400 2,525 2,275 832   35 35*
29		 2 1,740 1,020×590×2,700
2,100 2,225 1,975 730   1,540 1,020×590×2,400
1,800 1,900 1,700 627   1,330 1,020×590×2,100
450（18） 460 454 2,400 2,525 2,275 679   35*
29		 22*
20		 2 1,430 920×540×2,700
2,100 2,225 1,975 597   1,260 920×540×2,400
1,800 1,900 1,700 505   1,080 920×540×2,050
400（16） 409 403 2,400 2,525 2,275 539   22*
21		 18*
16		 2 1,130 820×490×2,700
2,100 2,225 1,975 459 450 970 820×490×2,400
1,800 1,900 1,700 400 385 850 820×490×2,050
350（14） 358 352 2,400 2,525 2,275 417 395 15 12 3 1,300 1,070×440×2,700
2,100 2,225 1,975 362 345 1,140 1,070×440×2,400
1,800 1,900 1,700 312 295 990 1,070×440×2,050
1,500 1,600 1,400 255 241 820 1,070×440×1,750
300（12） 307 302 2,100 2,225 1,975 262 255 8.8 7.5 3 820 920×380×2,250
1,800 1,900 1,700 235 222 690 920×380×1,900
1,500 1,600 1,400 189 180 570 920×380×1,600
250（10） 256 251 1,800 1,900 1,700   156 5.5 4.8 3 650 770×340×1,900
1,500 1,600 1,400   128 400 770×340×1,600
200（8） 205 200 1,800 1,900 1,700   99   2.7 3 310 720×270×1,900
1,500 1,600 1,400   80 250 720×270×1,600
175（7） 179 174 1,500 1,600 1,400   63   1.9 5 330 900×250×1,600
150（6） 154 148 1,500 1,600 1,400   46   1.1 5 240 770×220×1,600
Notes:
1.*Long Nipple
2. Sizes less than 130mm (5 1/8inches) are manufactured upon request.
3. TPI (Thread per inch) is the number of threads per 25.4mm (1 inch).

Standard Dimensions of Taper Thread

  • Nipple Details

    A: Maximum diameter
    B: Effective diameter
    L: Length

  • Socket Details

    B: Effective diameter
    T: Thread length
    S: Depth

  • 4TPI:Thread details
    (Pitch 6.350mm)
  • 3TPI:Thread details
    (Pitch 8.467mm)

4TPI (Pitch 6.350mm)

Thread designation Nipple Socket Effective
diameter
(B)
mm
Maximum
diameter
(A)
mm		 Length
(L)
mm		 Depth
(S)
mm		 Thread
length
(T)
mm
32T4L 431T4L 431.80 635.00 323.50 319.50 428.64
30T4L 406T4L 406.40 609.60 310.80 306.80 403.24
28T4L
28T4		 374T4L
374T4N		 374.65
374.65		 558.80
457.20		 285.40
234.60		 281.40
230.60		 371.49
371.49
24T4L
24T4		 317T4L
317T4N		 317.50
317.50		 457.20
355.60		 234.60
183.80		 230.60
179.80		 314.34
314.34
22T4L
22T4		 298T4L
298T4N		 298.45
298.45		 457.20
355.60		 234.60
183.80		 230.60
179.80		 295.29
295.29
20T4L
20T4L		 269T4L
269T4N		 269.88
269.88		 457.20
355.60		 234.60
183.80		 230.60
179.80		 266.72
266.72
18T4L
18T4		 241T4L
241T4N		 241.30
241.30		 355.60
304.80		 183.80
158.40		 179.80
154.40		 238.14
238.14
16T4L
16T4		 222T4L
222T4N		 222.25
222.25		 355.60
304.80		 183.80
158.40		 179.80
154.40		 219.09
219.09
14T4 203T4N 203.20 254.00 133.00 129.00 200.04
12T4 177T4N 177.80 215.90 114.00 110.00 174.64
10T4 152T4N 152.40 190.50 101.30 97.30 149.24
9T4 139T4N 139.70 177.80 94.90 90.90 135.54
8T4 122T4N 122.24 177.80 94.90 90.90 119.08
7T4 107T4N 107.95 165.10 88.60 84.60 104.79
6T4 92T4N 92.08 139.70 75.90 71.90 88.92

3TPI (Pitch 8.467mm)

Thread designation Nipple Socket Effective
diameter
(B)
mm
Maximum diameter
(A)
mm		 Length
(L)
mm		 Depth
(S)
mm		 Thread length
(T)
mm
22T3 298T3N 298.45 372.60 192.20 188.20 294.24
20T3 298T3N 298.45 372.60 192.20 188.20 294.24
18T3L
18T3		 273T3L
273T3N		 273.05
273.05		 457.20
355.60		 234.60
183.80		 230.60
179.80		 268.84
268.84
16T3L
16T3		 241T3L
241T3N		 241.30
241.30		 355.60
338.70		 183.80
175.30		 179.80
171.30		 237.09
237.09
14T3 215T3N 215.90 304.80 158.40 154.40 211.69
12T3 177T3N 177.16 270.90 141.50 137.50 172.95
10T3 155T3N 155.57 220.00 116.00 112.00 151.36
9T3 139T3N 139.70 203.20 107.80 103.60 135.49
Note:
1. TPI(Thread per inch) is the number of threads per 25.4mm (1 inch).
2. Thread designations and their details are based on JIS R7201.

Product Information

Consultations and inquiries

SEC CARBON,Ltd.

  • Tokyo Office
    7th Floor, Huric-Edobashi Bldg., 2-15-3 Nihonbashi, Chuo-ku, Tokyo, Japan MAP
    103-0027
  • +81-3-3279-0700
  • FAX：+81-3-3279-0711
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