GB/T 30824-2014 PDF English
US$430.00 · In stock · Download in 9 secondsGB/T 30824-2014: Testing method for temperature uniformity of gas heat treatment furnace 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 30824-2014 | English | 430 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Testing method for temperature uniformity of gas heat treatment furnace
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 30824-2014
GB/T 30824-2014: Testing method for temperature uniformity of gas heat treatment furnace---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/GBT30824-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.200
J 36
Testing method for temperature uniformity of gas heat
treatment furnace
Issued on. JUNE 24, 2014
Implemented on. DECEMBER 31, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification of gas heat treatment furnaces... 6
5 Implementation conditions and test cycle... 6
6 Test device... 8
7 Test methods... 11
8 Evaluation of temperature uniformity of the effective heating zone... 19
9 Test records and test reports... 20
10 Management... 20
Appendix A (Informative) Gas heat treatment furnace effective heating zone
temperature uniformity test record form... 22
Appendix B (Informative) Effective heating zone temperature uniformity test certificate
... 25
Bibliography... 26
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard shall be under the jurisdiction of National Technical Committee on Heat
Treatment of Standardization Administration of China (SAC/TC 75).
Main drafting organizations of this Standard. Inner Mongolia First Machinery Group
Co., Ltd. Measurement and Testing Center, Beijing Research Institute of Mechanical &
Electrical Technology, Jiangsu Fengdong Thermal Technology Co., Ltd.
Organizations that participate in the drafting of this Standard. Changzhou Keheng
Furnace Industry Co., Ltd., Xi’an Flit Heat Treatment Co., Ltd.
Main drafters of this Standard. Liu Junping, Xu Yueming, Han Boqun, Shi Yue’e, Nie
Yinglan, Song Xia, Tang Cunhu, Yang Hongfei, Li Xianjun, Zhang Hongzhi, Li
Shengjun, Gao Suheng, Li Qiao.
Testing method for temperature uniformity of gas heat
treatment furnace
1 Scope
This Standard specifies the implementation conditions and test cycle, test device, test
methods, and evaluation of temperature uniformity of the effective heating zone of gas
heat treatment furnaces.
This Standard applies to gas heat treatment furnaces heated by direct combustion gas
in the furnace, including cycle (intermittent) and continuous heat treatment furnaces.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1598, Platinum-10%Rhodium/Platinum thermocouple wires - Platinum-
13%Rhodium/Platinum thermocouple wires - Platinum-30%Rhodium/Platinem-
6%Rhodium thermocouple wires
GB/T 2614, Nickel-Chromium/Nickel-Silicon thermocouple wires
GB/T 4989, Extension and compensating cables for thermocouples
GB/T 4990, Alloy wires of extension and compensating cables for thermocouples
GB/T 7232, Terminology of metal heat treatment
GB/T 9452, Testing method for working zone of heat treatment furnace
GB/T 13324, Terminology of heat treatment equipment
GB/T 17615, Nickel-Chromium-Silicon/Nickel-Silicon-Magnesium thermocouple
wires
GB/T 18404, Mineral insulated metal-sheathed thermocouple cables and
thermocouples
3 Terms and definitions
Terms and definitions given in GB/T 9452, GB/T 7232 and GB/T13324, as well as the
following, are applicable to this document.
3.1
temperature control system error
An offset to the temperature measurement results produced by the temperature control
system composed of temperature sensors, extension and compensating cables, display
adjustment instruments, etc. Its value is the algebraic sum of the errors of temperature
sensors, extension and compensating cables, display adjustment instruments and other
components.
3.2
maximum permit error
The allowable error limits of measuring instruments and measuring systems specified
in technical specifications and standards.
4 Classification of gas heat treatment furnaces
Gas heat treatment furnaces are divided into five categories according to the
temperature uniformity of the effective heating zone.
5 Implementation conditions and test cycle
5.1 Implementation conditions
To determine whether the temperature uniformity of the effective heating zone of the
gas heat treatment furnace complies with the provisions of the heat treatment process
document, any of the following methods shall be used.
5.2 Test cycle
5.2.1 The temperature uniformity test cycle of the gas heat treatment furnace and the
calibration cycle of the temperature control instrument are shown in Table 2.
6 Test device
6.1 Composition and connection method
The test device consists of thermocouples, extension and compensating cables, test
instruments (or computers), transfer switches and temperature measurement frames.
The wiring diagram of the test device is shown in Figure 1.
6.5 Transfer switch
For signal switching between channels, the parasitic potential shall be tested regularly,
and the test cycle shall not exceed 1 year. The parasitic potential of a transfer switch
connected to base metal thermocouples with graduation numbers such as K, N, and E
shall not exceed 4 μV.
6.6 Temperature measurement frame
The size and shape of the bracket or frame used to fix the thermocouple depends on the
test method.
7 Test methods
7.1 Test requirements
7.1.1 The gas heat treatment furnace shall realize automatic temperature control, and
the qualified test status shall be able to be reproduced in the production process.
7.1.5 During the no-load test, the measuring ends of the test thermocouples distributed
near the burner and flue shall be protected with protective covers. It is also
recommended to add protective covers to the measuring ends of test thermocouples
distributed in other locations to reduce the impact of temperature fluctuations on the
test results.
7.1.6 The gas heat treatment furnace shall be heated at the heating rate specified by the
process. The furnace temperature shall not rise above the test temperature and then drop
to the test temperature.
7.1.7 During the test process, all parameters of the furnace shall reflect the normal
production operation process of the equipment.
7.2 Determination of test temperature
7.2.1 Initial test
Select the lowest and highest temperature points of the operating temperature range. If
the operating temperature range exceeds 330 °C, temperature test points shall be added
so that the test temperature interval is no greater than 330 °C.
7.3 Determination of number and location of test points
7.3.1 Test methods and applicable objects
7.3.1.1 The test methods are classified into fixed test point method and moving test
point method according to the state of the thermocouple during the test process. Where
the thermocouple position is fixed during the test, it is called the fixed test point method,
also known as the volume method;
7.3.1.2 The volume method is applicable to cyclic (box-type, pit-type) gas heat
treatment furnaces and continuous heat treatment furnaces which can be hardly realized
by the moving test point method;
7.3.2 Determination of number and location of test points of volume method
7.3.3 Determination of number and location of test points of unit volume method
A unit volume is the volume of pallets, frames, etc. loaded according to the rated loading
capacity. The number and location of test points of the unit volume method are
determined according to the size of the unit volume, and the distribution of test points
shall be able to reflect the temperature distribution within the unit volume. The
determination method is as follows.
7.4 Test sequence and method
7.4.1 Check the test instruments, test thermocouples, extension and compensating
cables, transfer switches, etc. of the test system, which shall be within the validity
period of the calibration.
7.4.6 Record all test data truthfully in Appendix A.
7.5.7 During the no-load test of the pulse burner heat treatment furnace, the minimum
or maximum temperature fluctuation at the same test point cannot be greater than 2
times the temperature uniformity; each reading shall be the average temperature of one
pulse cycle.
7.5.8 The maximum deviation between the actual temperature at each test point and the
set value is the temperature uniformity of the effective heating zone of the heat
treatment furnace under test.
8 Evaluation of temperature uniformity of the effective heating zone
8.1 Based on the temperature uniformity of the effective heating zone, compare Table
1 to evaluate the heat treatment furnace category.
9 Test records and test reports
Test records and test reports shall include the following content (see Appendix A and
Appendix B).
10 Management
10.1 All test records of temperature uniformity testing shall be stored in files according
to the management system of each unit.
10.2 A test report or inspection report shall be issued for the uniformity test of the
effective heating zone of the gas heat treatment furnace. If the test is qualified, the next
test date shall be listed, and a mark of conformity shall be issued. The mark of
conformity shall be hung in a conspicuous position of the heat treatment furnace.
10.3 Gas heat treatment furnaces that have exceeded the specified validity period shall
be stopped from use.
10.4 After the effective heating zone test is passed, the insertion depth of the
temperature control thermocouple shall be clearly marked and must not be moved until
the next test, otherwise the test shall be repeated.
......
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 30824-2014 be delivered?Answer: The full copy PDF of English version of GB/T 30824-2014 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 30824-2014_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 30824-2014_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 30824-2014 -- 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 30824-2014?A step-by-step guide to download PDF of GB/T 30824-2014_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 30824-2014".
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
|