This standard specifies the shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificate of graphite electrodes. This standard applies to ordinary power graphite electrodes made of high-quality petroleum coke, pitch coke, etc. as the main raw materials, through molding, roasting, graphitization and mechanical processing, and used as conductive materials for arc furnaces. YB/T 4088-2000 Graphite Electrode YB/T4088-2000 Standard download decompression password: www.bzxz.net

YB/T 4088--2000
This standard is revised on the basis of YB/T4088-1992 "Graphite Electrode". This standard is equivalent to IEC60239-1997 "Nominal Dimensions of Cylindrical Graphite Electrodes with Threaded Joint Holes and Joints for Electric Arc Furnaces", and refers to JISR7201--1997 "Artificial Graphite Electrodes" and related samples.
This standard has been revised in the following articles: -Added specifications and length grades,
Added and adjusted the joint size content;
Adjusted the technical indicators;
Put the current load of the electrode in the appendix as a reference indicator. This standard replaces YB/T4088-1992 "Graphite Electrode" from the date of implementation. Appendix A of this standard is the standard appendix, and Appendix B is the reminder appendix. This standard is proposed and managed by the Metallurgical Industry Information Standards Research Institute. The drafting units of this standard are Jilin Carbon Cable Group Co., Ltd., Metallurgical Industry Information Standards Research Institute, and Shijiazhuang South China Carbon Factory. The main drafters of this standard are Gao Bo, Sun Wei, and Zhao Mengzhou. This standard was first issued in December 1992. 120
1 Scope
Ferrous Metal Industry Standard of the People's Republic of China Graphite Electrode
Graphite electrode
YB/T 4088-2000
Replaces YB/T4088—1992
This standard specifies the shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificate of graphite electrodes.
This standard applies to ordinary power graphite electrodes made of high-quality petroleum coke, pitch coke, etc. as the main raw materials, through molding, roasting, graphitization and mechanical processing, and using electric arc furnaces as conductive materials. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1427—1988 Sampling method for carbon materials GB/T1429—1985 Determination method for ash content of carbon materials GB/T3074.1—1982 Determination method for flexural strength of graphite electrode GB/T3074.2—1982 Determination method for elastic modulus of graphite electrode GB/T3074.4—1982 Determination method for coefficient of thermal expansion (CTE) of graphite electrode GB/T8170—1987 Rules for rounding off values
YB/T119-1997 Determination method for bulk density of carbon materials YB/T 120—1997
Determination method for resistivity of carbon materials
YB/T 5212—1993
YB/T 8719—1997
Sonic velocity method
Test for elastic modulus of integral graphite electrode
General provisions for packaging, marking, transportation and quality certification of carbon materials and their products 3 Appearance, size and allowable deviation
The diameter and length of the electrode shall comply with the provisions of Table 1. Table 1
Nominal diameter
Actual diameter
Approved by the State Bureau of Metallurgical Industry on July 26, 2000 Small black skin part
Implementation on December 1, 2000
Nominal diameter
YB/T 4088—2000
Table 1 (end)
Actual diameter
The allowable deviation of the length of the electrode shall comply with the provisions of Table 2. Nominal length
Standard length deviation
3.3 The short length of electrodes allowed in each batch of supply shall not exceed 15%. The minimum length of black skin part
—100
3.4 ​​The electrode joint is conical. The shape and size of the joint shall be in accordance with the provisions of Figure 1 and Table 3. L
1600/1800
1600/1800
1600/1800
1 600/1 800/2 000/2 200
1600/1800/2000/2200
1800/2000/2200/2400
1 800/2 000/2 200/2 400
2000/2200/2400
Short ruler length deviation
Collar slash
Figure 1 Shape and size of electrode joint
3 Joint
YB/T4088-2000
Joint hole
Note: According to the requirements of the buyer and after consultation between the supplier and the buyer, cylindrical and other shapes of joints are allowed. The shape and size of cylindrical joints shall be in accordance with Appendix A (Appendix to the standard)
5 The end face gap at the connection of two electrodes shall not exceed 0.4mm. 3.5
4 Technical requirements
YB/T4088 -2000
The physical and chemical indicators of electrodes and joints shall comply with the provisions of Table 4. The current load can refer to the provisions of Appendix B (Appendix to the prompt). 4.1
Nominal diameter, mm
Resistivity
Flexural strength
Elastic modulus
Volume density
Coefficient of thermal expansion
(100℃～600℃)
Not more than
Not less than
Not more than
Not less than
Not more than
Note: Ash content and coefficient of thermal expansion are reference indicators. 4.2 Surface quality
μn·m
10-6/℃
75~130
150~225
There shall be no more than two pieces of debris or holes on the electrode surface, and their sizes shall not exceed the requirements of Table 5. 4.2.1
75~225
10～20(<10 is not counted）
3~5(<3 is not counted)
250~400bzxz.net
20～40（<20 is not counted）
5～10(<5 is not counted)
4.2.2 Holes and cracks are not allowed on the joints, joint holes and electrode surfaces within 100mm from the bottom of the hole. 250~300
350~500
450~～600
30～50 (<30 not counted)
10～15 (<10 not counted)
4.2.3 For the chipping of the joint and the thread of the joint hole, for the electrode and the joint with a diameter of not less than 250mm, the chipping shall not be more than one place and the length shall not exceed 30mm; for the electrode and the joint with a diameter of not more than 225mm, the chipping shall not be more than one place and the length shall not exceed 20mm. 4.2.4 No transverse cracks are allowed on the electrode surface. Longitudinal cracks with a width of 0.3mm～1.0mm, the length shall not exceed 5% of the circumference of the electrode and shall not exceed two, and longitudinal cracks with a width of less than 0.3mm shall not be counted. 4.2.5 Black skin area on the electrode surface: width is less than one-tenth of the electrode circumference, length is less than one-third of the electrode length 4.3 The physical and chemical indicators and current load requirements of electrodes with diameters of 550mm and 600mm shall be agreed upon by the supply and demand parties. 5 Test methods
5.1 The determination of resistivity shall be carried out in accordance with the provisions of Chapter 6 (on-site determination of graphite electrode products) of YB/T120-1997. 5.1.1 The electrodes shall be measured one by one after processing.
5.1.2 The joints shall be measured one by one on-site after graphitization. 5.2 The determination of flexural strength shall be carried out in accordance with the provisions of GB/T3074.1. 124
YB/T4088-2000
The determination of elastic modulus shall be carried out in accordance with the provisions of GB/T3074.2. The determination of the overall electrode shall be carried out in accordance with the provisions of YB/T5212. 5.3
5.4 The bulk density shall be determined in accordance with the provisions of YB/T119. 5.5 The coefficient of thermal expansion shall be determined in accordance with the provisions of GB/T3074.4. 5.6 The ash content shall be determined in accordance with the provisions of GB/T1429. 5.7
The end face gap at the electrode connection shall be determined using a feeler gauge. 6 Inspection rules
6.1 The quality inspection of the electrode shall be carried out by the supplier's quality supervision and inspection department, and the purchaser may conduct acceptance according to the provisions of this standard. 6.2 The sampling method shall be carried out in accordance with the provisions of GB/T1427. 6.3 The batch size of the coefficient of thermal expansion (CTE) and the number of samples per batch. 6.3.1 Electrodes of the same variety and specification shall be measured at least once a month, and the joints shall be measured once per furnace. 6.3.2 At least 2 samples shall be measured each time, and the measurement results shall be written in the quality certificate for user reference. 6.4 The rounding of values ​​shall be carried out in accordance with the provisions of GB/T8170. 7 Packaging, marking, storage, transportation and quality certificate 7.1 The finished electrode shall be marked with a safety line on the electrode surface corresponding to the bottom of the joint hole. 7.2 The packaging, marking, storage, transportation and quality certification of electrodes and connectors shall comply with the provisions of YB/T 8719. 125
YB/T 4088—2000
Appendix A
(Standard Appendix)
Shapes and dimensions of cylindrical connectors
A1 See Figure A1 and Table A1 for the shapes and dimensions of cylindrical connectors. L
250152.40
300184.20
0.70285.10
0.70375.00
276.00+0.70265.10+0.70172.50297.70
Appendix B
(Suggestive Appendix)
Current load of graphite electrode
B1 The current load of graphite electrode is recommended according to Table B1. Table B1
Nominal diameter, mm
Allowable current load, A
1000~~1 400
1 500~2 400
2200~3400
3000~4500
Connector hole
8. 47 2.372.82
12. 70 3. 674. 23
Current density, A/cm2
Nominal diameter, mm
YB/T 4088-2000
Table B1 (end)
Allowable current load, A
5 000~~6 900
7000~10000
10 000~13 000
13500~18000
18 000~23 500
22 000~~27 000
25 000~32 000
Current density, A/cm2
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