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YB/T 081-2013Rule for rounding off of numerical values and judgement of testing values for technical standards of metallurgy (English PDF)

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Issued by

Ministry of Industry and Information Technology of PRC

Level / Type

National · Recommended

Issue date

July 14, 2015

Implementation date

January 1, 2016

Scope

YB/T 081-2013 (Rule for rounding off of numerical values and judgement of testing values for technical standards of metallurgy) is available as an English-translated PDF.

YB/T 081-2013 — This standard specifies the shape, dimensions and tolerances, technical requirements, test methods, inspection rules, packaging, marking, storage, transportation and quality certificates of ultra high-power graphite electrodes.

This standard is applicable to ultra high-power graphite electrodes made of needle coke and coal tar pitch as main raw materials, formed by molding, burning, impregnation, graphitization and mechanical processing, and used as the conductive materials for electric furnace.

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Document preview — YB/T 081-2013

National Standard of the People's Republic of China

ICS: 29.050
Classification: Q 51

Issued by: Ministry of Industry and Information Technology of PRC

Foreword...3
1 Scope...4
2 Normative references...4
3 Shape, size and tolerance...5
4 Technical requirements...7
5 Test methods...8
6 Inspection rules...9
7 Packaging, marking, storage, transport and quality certificates...9
Appendix A (Informative) Current load of ultra high power graphite electrode10

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces YB/T 4090-2000 "Ultra high power graphite electrode".

As compared with YB/T 4090-2000, the main technical content changes of this

standard are as follows.

- REVISE the normative references;

- ADD the specifications and length grades;

- MODIFY the dimensions and tolerances;

- MODIFY the supply requirements;

- MODIFY the electrode connection requirements;

- MODIFY the physical and chemical indicators;

- MODIFY the surface quality;

- MODIFY the inspection rules;

- MODIFY the current load.

This standard was proposed by the China Iron and Steel Association.

This standard shall be under the jurisdiction of the National Steel

Standardization Technical Committee (SAC/TC 183).

Drafting organizations of this standard. Jilin Carbon Co., Ltd., China Pingmei

Shenma Group Kaifeng Carbon Co., Ltd., Henan Kefeng Carbon Materials Co.,

Ltd., Shanxi Sim East Sea Carbon Materials Co., Ltd., Metallurgical Industry

Information Standards Institute.

1 Scope

This standard specifies the shape, dimensions and tolerances, technical

requirements, test methods, inspection rules, packaging, marking, storage,

transportation and quality certificates of ultra high-power graphite electrodes.

This standard is applicable to ultra high-power graphite electrodes made of

needle coke and coal tar pitch as main raw materials, formed by molding,

burning, impregnation, graphitization and mechanical processing, and used as

the conductive materials for electric furnace.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this standard.

GB/T 1427 Sampling method for carbon material

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

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

electrodes

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

electrodes

GB/T 3074.4 Method for the determination of the coefficient of thermal

expansion of graphite electrodes

3 Shape, size and tolerance

3.1 The diameter and length of the electrode shall comply with the requirements

of Table 1.

3.2 The allowable deviation of the electrode length shall meet the requirements

of Table 2.

3.4 The electrode joint is conical; the shape and size of the joint are as specified

in Figure 1 and Table 3.

4 Technical requirements

4.1 Electrochemical indicators of electrodes and joints shall meet the

requirements of Table 4.

4.2 Surface quality

Normal diameter

Joint Joint hole Thread pitch

4.2.1 There shall be no more than two peeling off or holes in the surface of the

electrode. The diameter of the defect is 10 mm ~ 20 mm, it is not counted if it is

less than 10 mm, or less than 5 mm when the depth is 5 mm ~ 10 mm.

Table 4

4.2.4 No cracks are allowed on the electrode surface.

4.2.5 The area of the black skin on the surface of the electrode. the width is less

than one tenth of the circumference of the electrode; the length is less than one

third of the length of the electrode.

5 Test methods

5.1 The resistivity is measured in accordance with GB/T 24525.

5.2 The determination of the rupture strength is carried out in accordance with

the provisions of GB/T 3074.1.

5.3 The modulus of elasticity is determined in accordance with the provisions

of GB/T 3074.2.

5.5 The thermal expansion factor is determined in accordance with the

provisions of GB/T 3074.4.

5.6 Determination of ash content is carried out in accordance with the provisions

of GB/T 1429.

5.7 The end surface clearance at the electrode joint is measured 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; the buyer may make

acceptance in accordance with the provisions of this standard.

6.2 Sampling method shall be carried out in accordance with GB/T 1427.

6.3 Batch of thermal expansion coefficient (CTE) and quantity to be sampled

per batch.

6.4 The numerical rounding off is carried out in accordance with the provisions

of GB/T 8170.

7 Packaging, marking, storage, transport and quality certificates

7.1 The finished electrode is marked with a safety line on the surface of the

electrode corresponding to the bottom of the joint.

Appendix A

(Informative)

Current load of ultra high power graphite electrode

A.1 The current load of high power graphite electrodes is recommended to be

in accordance with Table A.1.

YB/T 4090-2015

FERROUS METALLURGY INDUSTRY STANDARD

ICS 29.050

Q 51

Replacing YB/T 4090-2000

Ultra high power graphite electrode

Issued on. JULY 14, 2015

Implemented on. JANUARY 01, 2016

Issued by. Ministry of Industry and Information Technology of PRC

Table of Contents

Foreword... 3

1 Scope... 4

2 Normative references... 4

3 Shape, size and tolerance... 5

4 Technical requirements... 7

5 Test methods... 8

6 Inspection rules... 9

7 Packaging, marking, storage, transport and quality certificates... 9

Appendix A (Informative) Current load of ultra high power graphite electrode 10

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces YB/T 4090-2000 "Ultra high power graphite electrode".

As compared with YB/T 4090-2000, the main technical content changes of this

standard are as follows.

- REVISE the normative references;

- ADD the specifications and length grades;

- MODIFY the dimensions and tolerances;

- MODIFY the supply requirements;

- MODIFY the electrode connection requirements;

- MODIFY the physical and chemical indicators;

- MODIFY the surface quality;

- MODIFY the inspection rules;

- MODIFY the current load.

This standard was proposed by the China Iron and Steel Association.

This standard shall be under the jurisdiction of the National Steel

Standardization Technical Committee (SAC/TC 183).

Drafting organizations of this standard. Jilin Carbon Co., Ltd., China Pingmei

Shenma Group Kaifeng Carbon Co., Ltd., Henan Kefeng Carbon Materials Co.,

Ltd., Shanxi Sim East Sea Carbon Materials Co., Ltd., Metallurgical Industry

Information Standards Institute.

1 Scope

This standard specifies the shape, dimensions and tolerances, technical

requirements, test methods, inspection rules, packaging, marking, storage,

transportation and quality certificates of ultra high-power graphite electrodes.

This standard is applicable to ultra high-power graphite electrodes made of

needle coke and coal tar pitch as main raw materials, formed by molding,

burning, impregnation, graphitization and mechanical processing, and used as

the conductive materials for electric furnace.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this standard.

GB/T 1427 Sampling method for carbon material

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

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

electrodes

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

electrodes

GB/T 3074.4 Method for the determination of the coefficient of thermal

expansion of graphite electrodes

3 Shape, size and tolerance

3.1 The diameter and length of the electrode shall comply with the requirements

of Table 1.

3.2 The allowable deviation of the electrode length shall meet the requirements

of Table 2.

3.4 The electrode joint is conical; the shape and size of the joint are as specified

in Figure 1 and Table 3.

4 Technical requirements

4.1 Electrochemical indicators of electrodes and joints shall meet the

requirements of Table 4.

4.2 Surface quality

Normal diameter

Joint Joint hole Thread pitch

4.2.1 There shall be no more than two peeling off or holes in the surface of the

electrode. The diameter of the defect is 10 mm ~ 20 mm, it is not counted if it is

less than 10 mm, or less than 5 mm when the depth is 5 mm ~ 10 mm.

Table 4

4.2.4 No cracks are allowed on the electrode surface.

4.2.5 The area of the black skin on the surface of the electrode. the width is less

than one tenth of the circumference of the electrode; the length is less than one

third of the length of the electrode.

5 Test methods

5.1 The resistivity is measured in accordance with GB/T 24525.

5.2 The determination of the rupture strength is carried out in accordance with

the provisions of GB/T 3074.1.

5.3 The modulus of elasticity is determined in accordance with the provisions

of GB/T 3074.2.

5.5 The thermal expansion factor is determined in accordance with the

provisions of GB/T 3074.4.

5.6 Determination of ash content is carried out in accordance with the provisions

of GB/T 1429.

5.7 The end surface clearance at the electrode joint is measured 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; the buyer may make

acceptance in accordance with the provisions of this standard.

6.2 Sampling method shall be carried out in accordance with GB/T 1427.

6.3 Batch of thermal expansion coefficient (CTE) and quantity to be sampled

per batch.

6.4 The numerical rounding off is carried out in accordance with the provisions

of GB/T 8170.

7 Packaging, marking, storage, transport and quality certificates

7.1 The finished electrode is marked with a safety line on the surface of the

electrode corresponding to the bottom of the joint.

Appendix A

(Informative)

Current load of ultra high power graphite electrode

A.1 The current load of high power graphite electrodes is recommended to be

in accordance with Table A.1.

......

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.

Referenced standards

Normative references

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