Dan Carbon (Shanghai) Company LimitedT e l : +86 (21) 5090 5535F a x : +86 (21) 6877 3975Email: sales@dancarbon.comAdd: Room 507, Building D, Luneng International CenterNo. 209, Guoyao Road, Pudong New AreaChina (Shanghai) Pilot Free Trade Zone, 200126www.dancarbon.com

Liaoning Dan Carbon Group Corporation LimitedDalishu Village, Fengshan Economic DistrictFengcheng Town, Dandong City, Liaoning Province, Chinawww.dantan.cn

LIAONING DAN CARBON GROUP CORPORATION

DAN CARBON（SHANGHAI）COMPANY LIMITED

GRAPHITE ELECTRODES

丹炭Dan Carbon

About DAN CARBON

DAN CARBON was founded in Fengcheng Dandong City Liaoning Province China in 1994，specializing in the field of RP (regular power), HP (high power) and UHP (ultra-high power) graphite electrodes, graphite blocks and special heterogeneous graphite and other carbon products development, production and brand operation, with an annual capacity of 100,000 tons.

Graphite electrodes are made

of mixed needle coke and coal

pitch , to be extruded , baked,

impregnated, graphitized and

machined for use as conductive

material on EAF ( Electric Arc

Furnace) and LF ( Ladle

Furnace) for steelmaking.

In steelmaking process, the EAF

method recycles used iron scrap

by melting at a temperature of

about 1600 ℃ in an electric arc

furnace. Graphite electrodes,

a kind of conductor , are an

essential component in this

kind of furnace.

IEC 60239 Graphite electrodes for electric arc furnaces-Dimensions and designationYB/T 4088 Graphite electrodeYB/T 4089 High power graphite electrodeYB/T 4090 Ultra high power graphite electrode

Standards

Applications

Dan Carbon (Shanghai) Company LimitedEstablished in China (Shanghai) Pilot Free Trade Zone, opening a new chapter of Dan Carbon in international import and export trade.

2020

Liaoning Dan Carbon Group CorporationEstablished as group corporation, forming a group resource sharing and integrated management model.

2019

Fengcheng Baoxin Carbon Co., Ltd.Built a full-process production line for large-scale UHP graphite electrodes of size up to 800 mm with an annual output of 40,000 tons.

2018

Dandong Xinxing Carbon Co., Ltd.Relocated and expanded on the basis of Fengcheng Qunxing Industrial Company , building an annual output of 25,000 tons of graphite electrode project.

Fengcheng Baoshan Carbon Co., Ltd.Due to the limited production area of Dandong Xinxing Carbon Company, the technological was transformed and upgraded , the processes of calcination, mixing, extrusion, baking, pitch impregnation, re-baking and graphitization , were moved and rebuilt, the annual production capacity was expanded to 35,000 tons.

Fengcheng Qunxing Industrial Co., Ltd.Main business scope is the recycled graphite electrodes manufacturing , supplied to fused magnesium smelting furnaces , with an annual production capacity of nearly 10,000 tons.

2006

2004

1994

High current carrying capacity

High resistance to thermal shock

Outstanding flexural strength

High temperature resistance to oxidation

Low modulus of elasticity

Low coefficient of thermal expansion

Features

For AC Furnaces, they require 3 columns of graphite electrodes, and mostly use diameter from 400 to 700 mm (16-28 inch).

For DC Furnaces, they require 1 column of graphite electrodes , and the maximum diameter is up to 800 mm (22-32 inch).

For LF , they have a small capacity than DC Furnaces, and mostly use diameter from 200 to 450 mm (8-18 inch).

1 2

Description

DAN CARBON graphite electrodes are manufactured at three

factories in Fengcheng Dandong City Liaoning Province China.

Fengcheng Baoxin Carbon Co., Ltd. performs all processes from the

raw material to final products, Fengcheng Baoshan Carbon Co., Ltd.

performs the processes of calcination, crushing, screening, grinding,

mixing, kneading, extrusion, baking, pitch impregnation, re-baking

and graphitization, and Dandong Xinxing Carbon Co., Ltd. performs

machining, testing, packing and shipping processes.

Extrusion

Crushing Screening

Kneading

Mixing

The cokes are crushed, grinded, screened,

mixed, and kneaded with binder pitch in

conrolled proportion.

The kneaded materials are

formed into a variety of green

electrodes by using extrusion

press.

Baking & Impregnation

The green electodes are baked,

pitch impregnated and re-baked

as need to improve thermal

stability, mechanical strength

and to give electrical

conductivity.

Graphitization

Treat the baked electrodes

at extremely highly

temperatures to cheange

its structure from

amorphous carbon to

graphite and obtain

excellent material

properties.

Machining

The graphitized electrodes

are machined to exact

dimensions and tolerances,

including the sockets of

electrodes with a threaded

graphite pin joining system.

Testing & Shipping

Strict testing and inspection

are carried out at each

process, only high quality

final products are packed

and shipped to the users.

Calcination

Raw Material

Store each raw material

separately according to

grades and supply

source.

GrindingMixing

Production Flow Chart

3 4

Property

Electrode Diameter

200～300 mm

(8～12 inch)

350～450 mm

(14～18 inch)

500～700 mm

(20～28 inch)

RP HP RP HP UHP RP HP UHP

Bulk Densit g/cm3 1.54～1.62 1.65～1.73 1.54～1.62 1.65～1.73 1.66～1.74 1.54～1.62 1.65～1.73 1.66～1.74

Specific Resistance μ�Ωm 7.0～8.8 5.0～6.2 7.0～8.8 5.0～6.2 4.2～5.8 7.5～9.5 5.3～6.5 4.2～5.8

Flexural Strengt MPa 7.5～9.5 10.5～15.5 7.5～9.5 10.5～15.5 10.5～15.5 6.5～8.5 10.0～15.0 10.0～15.0

Elastic Modulu GPa 6.5～9.0 9.0～12.0 6.5～9.0 9.0～12.0 9.0～13.0 6.5～9.0 9.0～12.0 9.0～13.0

Coefficient ofThermal Expansion ×10-6/°C 2.0～2.4 1.6～1.9 2.0～2.4 1.6～1.9 1.0～1.4 2.0～2.4 1.6～1.9 1.0～1.4

Ash Conten % Less than 0.2 Less than 0.2 Less than 0.2 Less than 0.2 Less than 0.2 Less than 0.2 Less than 0.2 Less than 0.2

Unit

300 (12) 10000 13000 13000 17400 15000 22000 - -

350 (14) 13500 18000 17400 24000 20000 30000 - -

400 (16) 18000 23500 21000 31000 25000 40000 - -

450 (18) 22000 27000 25000 40000 32000 45000 - -

500 (20) 25000 32000 30000 48000 38000 55000 - -

550 (22) 28000 34000 34000 53000 45000 65000 - -

600 (24) 30000 36000 38000 58000 50000 75000 57500 86250

650 (26) 32000 39000 41000 65000 60000 85000 69000 97750

700 (28) 34000 42000 45000 72000 70000 100000 82800 115000

Nominal

DiameterRP HP UHP-ACF UHP-DCF

Min Max Min Max Max Max Min Maxmm (inch)

A A A A A A A A

200 (8) 5000 6900 5500 9000 - - - -

250 (10) 7000 10000 8000 13000 - - - -

Properties

RP HP UHP

Bulk Density g/cm3

1.73 ~1.78 1.77 ~1.82 1.80 ~1.86

Specific Resistance μΩm 4.2 ~5.2 3.4 ~4.4 3.0 ~4.0

Flexural Strength MPa 17 ~22 21 ~26 23 ~32

Elastic Modulus GPa 10 ~16 12 ~18 15 ~21

Coefficient ofThermal Expansion ×10

-6/°C 1.7 ~2.0 1.3 ~1.6 0.9 ~1.2

Property UnitConnecting Pins

Graphite Electrode Properties

Connecting Pin Properties

The electrical resistance per unit length. Electrical resistance does not increase strongly with temperature in electrodes. Up to 1400 °C, the electrical resistance is lower than it was at room temperature.

GB/T 24525 Method for determination of specific resistance of carbon materials

A measurement of the maximum stress which electrodes will withstand before rupture in bending. Higher flexural strength in electrodes will generally result in lower electrodes breakage frequency.

GB/T 3074.1 Method for determination of the flexure strength of graphite electrodes

A measurement of elastic deformation between stress and elongation or compression of electrodesunder external force.

GB/T 3074.2 Method for determination of the elastic modulus of graphite electrodes

A measurement of increase in length per unit length per degree rise in temperature. Lower CTE will give better resistance to thermal shock. CTE compatibility between the electrode and the connecting pin is important for satisfactory performance of the electrode joint.

GB/T 3074.4 Method for determination of the coefficient of thermal expansion of graphite electrodes

A measurement of weight per unit volume. Higher bulk density in electrodes will generally result in improved mechanical properties.

GB/T 24528 Carbon materials – Determination method of the bulk density

Graphite electrodes generally have less than 0.5% impurities, and do not contain elements harmful to steelmaking.

GB/T 1429 Carbon materials – Determination of the ash content

Determination Methods

Current Carrying Capacity

5 6

01

02

03

04

05

06

Major Diameter Pitch Diameter Length Minor Diameter Pitch Diameter Depth

d 1 d 2 l 1 d 3 d 4 l 2

mm (inch) Type T3 mm mm mm mm mm mm

250 155T3N 155.57 151.36 220 147.14 151.36

300 177T3N 177.16 172.95 270.9 168.73 172.95

350 215T3N 215.9 211.69 304.8 207.47 211.69

400 215T3N 215.9 211.69 304.8 207.47 211.69

400 241T3N 241.3 237.09 338.7 232.87 237.09

450 241T3N 241.3 237.09 338.7 232.87 237.09

450 273T3N 273.05 268.84 355.6 264.62 268.84

500 273T3N 273.05 268.84 355.6 264.62 268.84

500 298T3N 298.45 294.24 372.6 290.02 294.24

550

（10）

（12）

（14）

（16）

（16）

（18）

（18）

（20）

（20）

（22） 298T3N 298.45 294.24 372.6 290.02 294.24

116

141.5

158.4

158.4

175.3

175.3

183.8

183.8

192.2

192.2

Nominal

Diameter of

Electrodes

IEC

Designation

of Joint

Pin Socket

200 (8) 205 200 1800 1900 1700 1700 1525

250 (10) 256 251 1800 1900 1700 1700 1525

300 (12) 307 302 1800 1900 1700 1700 1525

350 (14) 357 352

1800 1900 1700 1700 1525

2100 2200 2000 2000 1825

2400 2500 2300 2300 2125

400 (16) 409 403

1800 1900 1700 1700 1525

2100 2200 2000 2000 1825

2400 2500 2300 2300 2125

450 (18) 460 454

1800 1900 1700 1700 1525

2100 2200 2000 2000 1825

2400 2500 2300 2300 2125

500 (20) 511 505

1800 1900 1700 1700 1525

2100 2200 2000 2000 1825

2400 2500 2300 2300 2125

550 (22) 562 556

2100 2300 1950 1950 1800

2400 2600 2250 2250 2100

2700 2900 2550 2550 2400

600 (24) 613 607

2100 2300 1950 1950 1800

2400 2600 2250 2250 2100

2700 2900 2550 2550 2400

650 (26) 663 659

2400 2600 2250 2250 2100

2700 2900 2550 2550 2400

3000 3200 2850 2850 2700

700 (28) 714 710

2400 2600 2250 2250 2100

2700 2900 2550 2550 2400

3000 3200 2850 2850 2700

Nominal

Diameter

Actual Diameter

SpecificationsNominal

Length

Length

Specificationsfor

NormalElectrodes

Actual

Specificationsfor

Short Electrodes

Max Min Max Min Max Min

(inch)mm mm mm mm mm mm mm mm

Actual Length

Diameters and Lengths of Electrodes

Dimensions of Pins and Sockets (T3)Selection

7 8

Notes:

1. A low spot may be accepted only if the diameter measured at the low sport is not more than

3 mm below the min diameter specification.

2. Each shipment contain 5% short electrodes may be accepted unless the acceptable percentage

of short electrodes per delivery is decided by agreement between the supplier and user.

Notes:1.Type T3 is 3 taper threads per inch, pitch 8.47 mm.2.Pin pitch diameter is equal to socket pitch diameter (d2 = d4).3.Socket minor diameter is equal to pitch diameter (d3 = d4 - 4.22).

Nominal

Diameterof

Electrodes

IEC

Designation

of Joint

Pin Socket

Major

Diameter

Pitch

DiameterLength

Minor

Diameter

Pitch

DiameterDepth

mm (inch) TypeT4 mm mm mm mm mm mm

200 (8) 122T4N 122.24 119.08 177.80 115.92 119.08 94.90

250 (10) 152T4N 152.40 149.24 190.50 146.08 149.24 101.30

300 (12) 177T4N 177.80 174.64 215.90 171.48 174.64 114.00

350 (14) 203T4N 203.20 200.04 254.00 196.88 200.04 133.00

400 (16) 222T4N 222.25 219.09 304.80 215.93 219.09 158.40

400 (16) 222T4L 222.25 219.09 355.60 215.93 219.09 183.80

450 (18) 241T4N 241.30 238.14 304.80 234.98 238.14 158.40

450 (18) 241T4L 241.30 238.14 355.60 234.98 238.14 183.80

500 (20) 269T4N 269.88 266.72 355.60 263.56 266.72 183.80

500 (20) 269T4L 269.88 266.72 457.20 263.56 266.72 234.60

550 (22) 298T4N 298.45 295.29 355.60 292.13 295.29 183.80

550 (22) 298T4L 298.45 295.29 457.20 292.13 295.29 234.60

600 (24) 317T4N 317.50 314.34 355.60 311.18 314.34 183.80

600 (24) 317T4L 317.50 314.34 457.20 311.18 314.34 234.60

650 (26) 355T4N 355.60 352.44 457.20 349.28 352.44 234.60

650 (26) 355T4L 355.60 352.44 558.80 349.28 352.44 285.40

700 (28) 374T4N 374.65 371.49 457.20 368.33 371.49 234.60

700 (28) 374T4L 374.65 371.49 558.80 368.33 371.49 285.40

Dimensions of Pins and Sockets (T4)

109

Notes:1.Type T4 is 4 taper threads per inch, pitch 6.35 mm.2.Pin pitch diameter is equal to socket pitch diameter (d2 = d4).3.Socket minor diameter is equal to pitch diameter (d3 = d4-3.16).

Length of pin l1 (-4) 0

Depth of socket l2 -3 (+10)

Length of thread l3 -2 (+8)

Recess of pin l4 0 10

Recess of socket l5 0 4

Pitch diameter of pin d2 (-1) 0

Pitch diameter of socket d4 0 (+0.5)

Dimension

mm mm

Min Max

Tolerances for Sockets and Pins

(tolerance in brackets are informative only)

Tolerances for Sockets and Pins

Designation

Electrodes shall be designated by the nominal diameter, the nominal length and the socket designation.

EXAMPLE 1 Designation ofelectrodes with normal sockets:600 × 2100 × 317T4N

EXAMPLE 2 Designation ofelectrodes with long sockets:700 × 2400 × 374T4L

d1 d2 l1 d3 d4 l2

9 908 2100×1070×470 930

7 1900×1065 580 1110 2100×1065×580 1150

2 1900×850 500 795 2100×850×500 830

3 1900×1260 500 1180 2100×1260×500 1230

2 2200×850 500 890 2400×850×500 920

3 2200×1260 500 1300 2400×1260×500 1345

2 1900×970 550 990 2100×970×550 1035

2 2200×970 550 1100 2400×970×550 1140

2 1900×1070 600 1205 2270×1070×600 1260

2 2200×1070 600 1375 2450×1070×600 1440

2 2200×1170 650 1690 2450×1170×650 1775

2 2500×1170 650 1940 2750×1170×650 2025

600 2100 24×84 2 2200×1270 700 2000 2450×1270×700 2098

600 2400 24×96 2 2500×1270 700 2300 2750×1270×700 2398

600 2700 24×106 2 2920×1270 700 2700 3150×1270×700 2798

650 2400 26×96 2 2620×1360 780 2800 2900×1360×780 3000

650 2700 26×106 2 2920×1360 780 3100 3200×1360×780 3280

700 2400 28×96 2 2780×1460 835 3200 3140×1460×835 3290

700 2700 28×106 2 3080×1460 835 3600 3440×1460×835 3690

3 1900×970 400 685 2050×970×400 710

6 1900×970 700 1370 2100×970×700 1420

×

×

×

×

×

×

×

300 1800 12×72×

3 1900×1100

1900×1070 470×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×

×480 880 2100×1100×480 915

NominalDiameter

of Electrodes×LengthNumbersof

Electrodes

per Crate

ElectrodesElectrodeswith pins

already assembled in sockets

Overall Dimensions Approx.Weight Overall Dimensions Approx.Weight

mm (inch) mm kg mm kg

Dimensions and Weight of Packing

Packing, Marking, Storage and TransportMarking

1、Mark the safety lines on the finished electrode surface beside the socket.

2、The width of the safety lines should be more than 25 mm.

3、Forbid to mark two or more than two safety lines on the same end of the electrode.

4、Labels should be stuck to the finished pins and the shipping mark should be apparently on each package.

Storage

3、Please do not store the electrodes and pins near the place of high temperature to prevent the pitch plugs from melting on account of excessive temperature.

1、Please do not stack the electrodes and the pins directly on the ground. It is recommended to place them on the square timber or iron frame, to prevent the electrodes from being damaged or stuck to the soil; please do not remove the package of the electrodes and pins which are not used temporarily, to prevent dust and debris from falling on the thread or the electrode sockets.

2、Electrodes should be neatly stored in the warehouse, and both sides of the electrodes should be well-padded to prevent slipping. The stacking height of the electrodes is generally not more than 2 meters.

4、The stored electrodes should be protected from rain and moisture. The wetted electrodes should be dried at least 36 hours before use to avoid cracking and oxidation of the electrodes during steelmaking.

Transport

1、Vehicles for transporting electrodes over long distances should be covered with rainproof tarpaulins.

4、When loading and unloading the cases of pins, please handle and put down it gently to prevent the joint colliding and thread damage.

3、In order to protect the end faces and threads of the electrodes, it is not allowed to directly hang the electrodes at both ends with iron hook.

2、When lifting or reloading electrodes, please be careful to prevent the damage caused by the sliding because of the inclination of the electrodes.

11 12

Notes:

1. Electrodes may be packed with pins already assembled in sockets or with pins separately packaged.

2. Electrodes are delivered on wooden crates strapped with steel bands, the threads and end faces being

protected by end caps in order to minimize the risk of damage.

( )

( )

( )

( )

( )

( )

( )

550 2400 22×96× ( )

550 2100 22×84× ( )

500 2100 18×84× ( )

500 1800 18×72× ( )

450 2100 18×84× ( )

450 1800 18×72× ( )

400 2100 16×84× ( )

400 2100 16×84× ( )

400 1800 16×72× ( )

400 1800 16×72× ( )

350×1800 14×72( )

( )

300 1800 12×72× ( )

250 1800 10×72× ( )

200 1800× 8×72( )

Lift the new electrode over the old column, and slowly drop it vertically to avoid any thread damage occurring from shocks.

01

Turn the new electrode with a torque ring. At this time, the lift plug and the electrode rotate down together until the end faces of the two electrodes contact.

02

Tighten the electrode with appropriate torque to lock the electrode.03

Jointing

Maintain protection until graphite lift plug is to be inserted.

Check that socket and end faces are clean and undamaged.

Use only clean and undamaged graphite lift plug.

Carefully insert lift plug into socket.

alternatively place a cushioning material underneath the pin to prevent damage to the threads.When raising the electrode from horizontal to vertical position, leave the pin protection in place or 01

Clean the socket and end faces of the old column as well as of the new electrode with compressed air.02

In the case where some dirt should be removed manually, use a soft brush against the threads. Use of a metallic brush should be avoided.

03

Preparation of Jointing

Preparation of New Electrode for Addition

Handing and Jointing

01

02

03

04

13 14