GB/T 24525-2009 PDF English
US$90.00 · In stock · Download in 9 secondsGB/T 24525-2009: Method for determination of specific resistance of carbon materials Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 24525-2009 | English | 90 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Method for determination of specific resistance of carbon materials
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 24525-2009
GB/T 24525-2009: Method for determination of specific resistance of carbon materials---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT24525-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.050
Q 52
Method for Determination of
Specific Resistance of Carbon Materials
Issued on: OCTOBER 30, 2009
Implemented on: MAY 1, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Determination of Test Body in Lab ... 5
5 On-Site Determination of Graphite Electrode Products ... 7
6 Allowable Error ... 9
7 Test Report ... 9
Foreword
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel.
Drafting organizations of this Standard. Sinosteel Jilin Carbon Co., Ltd., and China
Metallurgical Information and Standardization Research Institute.
Chief drafting staffs of this Standard. Wang Jun, Guo Rongyao, Kang Jian, and Cui
Guowei.
Method for Determination of
Specific Resistance of Carbon Materials
1 Scope
This Standard specifies the principle, apparatus, test procedures and allowable error
for the determination of specific resistance of carbon materials.
This Standard is applicable to the determination of specific resistance of carbon
products and graphite products at room temperature.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 1427 Sample Method of Carbon Material
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and
Judgement of Limiting Values
3 Principle
The specific resistance represents a property of the material, which is the amount of
resistance when current passing the material. It numerically equals to the resistance
value of the conductor with length (L) of 1m and sectional area (S) of 1m2, which is
expressed by ρ. The following formula can be obtained as per Ohm’s Law and the
characteristics of the conductor.
Where.
ρ – Specific resistance of conductor, in µΩm;
Figure 3 Diagram of Testing System of Specific Resistance Tester
5.3.4 Clamp the test body on the test bench; press the current button, so that current
passes the extrusion axial of test body, then read the specific resistance value.
5.3.5 When measuring the current, the test body temperature may raise; therefore,
the measuring time is required to be as short as possible (not exceed 1 min); current
density is lower than 1 A/cm2; so that the change of specific resistance caused by heat
is no more than ±0.5%.
6 Allowable Error
The allowable error when measuring the specific resistance of carbon materials shall
be 2%.
7 Test Report
The test report shall contain the following contents.
a) Entrusting organization;
b) Specimen number, name and specification;
c) Individual and average value of the test result;
d) Potential contact spacing;
e) Current value at the time of measurement;
f) Testing organization;
g) Auditors;
h) Test date.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 24525-2009 be delivered?Answer: The full copy PDF of English version of GB/T 24525-2009 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 24525-2009_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 24525-2009_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 24525-2009 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB/T 24525-2009?A step-by-step guide to download PDF of GB/T 24525-2009_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 24525-2009".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|