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GB/T 30824-2014 PDF English

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GB/T 30824-2014: Testing method for temperature uniformity of gas heat treatment furnace
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GB/T 30824-2014: Testing method for temperature uniformity of gas heat treatment furnace

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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.
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