YB/T 4090-2000 Ultra-high power graphite electrode

This standard specifies the shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificate of ultra-high power graphite electrodes. This standard applies to ultra-high power graphite electrodes made of high-quality needle coke as the main raw material, through molding, roasting, impregnation, graphitization and mechanical processing, and used as the conductive material of the electric arc furnace. YB/T 4090-2000 Ultra-high power graphite electrode YB/T4090-2000 Standard download decompression password: www.bzxz.net

YB/T 4090--2000
This standard is revised on the basis of YB/T4090--1992 "Ultra-high power graphite electrodes". This standard is equivalent to IEC60239-1997 "Nominal dimensions of cylindrical graphite electrodes with threaded joint holes and joints for arc furnaces", and refers to JISR7201--1997 "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 replaces YB/T4090--1992 from the date of implementation. Appendix A of this standard is a prompt appendix.
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 Standard Research Institute, and Lanzhou Carbon Co., Ltd. The main drafters of this standard are Gao Bo, Sun Wei, and Liu Chengquan. This standard was first issued in December 1992. 135
1 Fan Pu
People's Republic of China Ferrous Metal Industry Standard Ultra-high Power Graphite Electrode
Ultra high powr graphite electrodeYB/T 4090—2000
Replaces YB/T4090—1992
This standard specifies the shape, size and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificate of ultra-high power graphite electrodes. This standard applies to ultra-high power graphite electrodes made of high-quality needle coke as the main raw material, through molding, roasting, leaching, graphitization and mechanical processing, and using electric arc furnace as the conductive material. 2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1427---1988 Sampling method for carbonaceous materials GB/T 1429—1985
Determination method for ash content of carbonaceous materials
GB/T 3074. 1--1982
GB/T 3074.2—1982
GB/T 3074. 4—1982
GB/T 8170—-1987
YB/T 119—1997
YB/T 120---1997.
Determination method of flexural strength of graphite electrode
Determination method of elastic modulus of graphite electrode
Determination method of coefficient of thermal expansion (CTE) of graphite electrode-Numerical rounding rules
Determination method of bulk density of carbon material
Determination method of resistivity of carbon material
YB/T 5212—1993
YB/T 8719-—1997
Test for elastic modulus of integral graphite electrode-Sound velocity methodGeneral provisions for packaging, marking, storage, transportation and quality certificate of carbon materials and their products 3 Appearance, dimensions and allowable deviations
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 Metallurgical Industry Bureau on 2000-07-26136
Black skin part is small
1600/1800
1600/1800
1600/1800/2000/2200
1600/1800/2000/2200
1800/2000/2200/2400
1800/2 000/2 200/2 400
2000~12-01 implementation
Nominal diameter
YB/T4090-2000
Table 1 (end)
Actual diameter
The allowable deviation of electrode length shall comply with the provisions of Table 2. Nominal length
Standard length deviation
The short-length electrode allowed in each batch of supply shall not exceed 15%. 3.3
The minimum black skin part
—100
—100
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
3. 834.64
2000/2200/2400
2400/2700
2400/2700
Short ruler length deviation
—100
—150
Collar slash
Connector 3
Figure 1 Shape and size of electrode connector
—275
Collar release line
Connector hole
3. Connector
YB/T 4090--2000
End of Table 3
The end face gap at the electrode connection is not greater than 0.4mm. 3.5
4 Technical requirements
4.1 The physical and chemical indicators of the electrode and connector should comply with the requirements of Table 4. Mesh
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
Not more than
Note: Ash content is a reference indexwww.bzxz.net
10-6/℃
Nominal diameter, mm
300, 350, 400
450, 500
4.2 Surface quality
YB/T4090—2000
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)
450~700
30～50(<30 is not counted)
10～15(<10 is not counted)
4.2.2 Holes and cracks are not allowed on the joint, joint hole and electrode surface within 100mm from the bottom of the hole. 4.2.3 The joint and joint hole thread shall not have more than one piece of chipping, and the length shall not exceed 30mm. mm
4.2.4 Transverse cracks are not allowed on the electrode surface. Longitudinal cracks with a width of 0.3mm~~1.0mm shall not exceed 80mm in length and no more than two; and longitudinal cracks with a width of less than 0.3mm shall not be counted. 4.2.5 The width of the black skin area on the electrode surface is less than one tenth of the electrode circumference; the 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/T120-1997. 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/T 3074.1. 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. 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 in accordance with 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; joints 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. 139
YB/T 4090—2000
Appendix A
(Suggestive Appendix)
Current load of ultra-high power graphite electrodes
The current load of ultra-high power graphite electrodes is recommended to be in accordance with Table A1. Table A1
Nominal diameter, mm
Allowable current load, A
15000~22000
20 000~30 000
25 000~40 000
32 000～45 000
38 000~55000
Current density, A/cm2
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