This standard specifies the shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificate of high-power graphite electrodes. This standard applies to high-power graphite electrodes made of high-quality petroleum coke, needle coke, etc. as the main raw materials, through molding, roasting, impregnation, graphitization and mechanical processing, and used as the conductive material of the electric arc furnace. YB/T 4089-2000 High-power graphite electrode YB/T4089-2000 Standard download decompression password: www.bzxz.net

YB/T 4089--2000
This standard is revised on the basis of YB/T4089-1992 "High Power Graphite Electrode". This standard is equivalent to IEC60239-1997 "Nominal Dimensions of Cylindrical Graphite Electrodes with Threaded Joint Holes and Joints for Electric Isolation Furnaces", and refers to JISR72011997 "Artificial Graphite Electrodes" and related samples. This revision of this standard has modified the following provisions: added specifications and length grades;
added and adjusted the joint size content;
adjusted the technical indicators;
put the current load of the electrode as a reference indicator in the appendix. This standard is recommended to replace Appendix A of YB/T4089-1992 from the date of implementation.
This standard is proposed and managed by the Metallurgical Industry Information Standard Research Institute. The drafting units of this standard are: Jilin Carbon Group Co., Ltd., Metallurgical Industry Information Standards Research Institute, Shijiazhuang South China Carbon Factory, Henan Sanli Carbon Products Co., Ltd.
The main drafters of this standard are: Gao Bo, Sun Wei, Zhao Mengzhou, Hou Xiuqing. This standard was first issued in December 1992. 128
People's Republic of China Ferrous Metal Industry Standard High Power Graphite Electrode
High power graphite electrodeYB/T 4089—2000
Replaces YB/T4089—1992
This standard specifies the shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificate of high power graphite electrodes. This standard applies to high power graphite electrodes made of high-quality petroleum coke, needle coke, etc. as the main raw materials, through molding, roasting, diffusion, graphitization and mechanical processing, and using electric arc furnace as the conductive material. Cited 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 materialsGB/T3074.1—1982 Determination method for flexural strength of graphite electrodeDetermination method for elastic modulus of graphite electrode
GB/T 3074.2—-1982bZxz.net
GB/T3074.4-1982 Determination method for coefficient of thermal expansion (CTE) of graphite electrodeGB/T 8170--1987
YB/T 119—1997
YB/T 120—1997
Rules for rounding off values
Determination method for bulk density of carbon materials
Determination method for resistivity of carbon materials
YB/T 5212—1993
YB/T 8719.--1997
Test for elastic modulus of integral graphite electrode
Sound velocity method
General provisions for packaging, marking, storage, transportation and quality certificate of carbon materials and their products 3 Appearance, size and allowable deviation
The diameter and length of the electrode shall conform to the provisions of Table 1. Table 1
Nominal diameter
Approved by the State Metallurgical Industry Bureau on July 26, 2000
Minimum black skin part
1600/1800
1600/1800
Implemented on December 1, 2000
Nominal diameter
YB/T4089--2000
Table 1 (end)
Actual diameter
The allowable deviation of electrode length shall comply with the provisions of Table 2. Nominal length
Standard length deviation
3.3 The allowable short-length electrode in each batch of supply shall not exceed 15%. Table 2
—100
The smallest black part
3.4 ​​The electrode joint is conical, and the shape and size of the joint shall comply with the provisions of Figure 1 and Table 3. L
Dun slash
≤Joint 3
3.831.641901
Shape and size of electrode joint
Length
1600/1800/2000/2200
1600/1800/2000/2200
1 800/2 000/2 200/2 400
1800/2000/2200/2400
2000/2200/2400
2400/2700
2400/2700
Short ruler length deviation
—275
Inclined line
3 Connection
YB/T 4089--2000
The end face gap between two electrodes shall not exceed 0.4mm. 3.5
4 Technical requirements
4.1 The physical and chemical indicators of electrodes and joints shall comply with the requirements of Table 4. 0
Connector hole
234:60
Resistivity
Flexural strength
Elastic modulus
Volume density
Coefficient of thermal expansion
Not greater than
Not less than
, not greater than
Not less than
Not greater than
(100℃~600℃)|| tt||Not more than
Note: Ash content is the Xin test index
4.2 Surface quality
YB/T4089—-2000
μa·m
10-/℃
Nominal diameter
200~400
4.2.1 There shall be no more than two pieces of debris or holes on the electrode surface, and their sizes shall comply with the requirements of Table 5. Table 5
200~400
20~40(<20 is not counted)
5~10(<5 is not counted)
Nominal diameter
450, 500
450~700
30~50(<30 is not counted)
10~15(<10 is not counted)
The joint, joint hole and the electrode surface within 100mm from the bottom of the hole are not allowed to have pores and cracks. 4.2.2
The thread of the joint and the joint hole shall not fall off in more than one place and the length shall not exceed 30mm. 4.2.4 Transverse cracks are not allowed on the electrode surface. The longitudinal cracks with a width of 0.3mm~1.0mm shall not exceed 5% of the electrode circumference and shall not exceed two, and the 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 a diameter of 550mm~700mm shall be agreed upon by the supply and demand parties. 5 Test method
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) in YB/T 120-1997. 5.1.1 The electrodes shall be measured on-site one by one after processing. 5.1.2 The joints shall be measured on-site one by one after graphitization. 5.2 The determination of flexural strength shall be carried out in accordance with the provisions of GB/T3074.1. 5.3 The determination of elastic modulus shall be carried out in accordance with the provisions of GB/T3074.2, and the determination of the integral electrode shall be carried out in accordance with the provisions of YB/T5212. 5.4 The determination of volume density shall be carried out in accordance with the provisions of YB/T119. 5.5 The determination of thermal expansion coefficient shall be carried out 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 joint shall be determined using a feeler gauge. 132
6 Inspection and testing
YB/T4089—2000
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 to be taken in each batch. 6.3.1 Electrodes of the same variety and specification shall be measured at least once a month; the joint shall be measured once per furnace. 6.3.2 No less than 2 samples shall be measured each time, and the measurement results shall be written in the quality certificate. 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/T8719. 133
YB/T4089—2000
Appendix A
(Suggestive Appendix)
Current load of high-power graphite electrodes
The current load of high-power graphite electrodes is recommended to be in accordance with Table A1. Table A1
Nominal diameter, mm
Allowable current load, A
5500~9000
6 500~10 000
8000~13000
1300017400
17400~~24000
21 00031 000
25 000~40 000
30000~48000
Current density, A/cm
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