Test method for qualified work zone of heat treatment furnace
1 Scope
This document specifies the classification of heat treatment furnaces by temperature uniformity, initial test and periodic test of qualified work zone, test systems, test methods, evaluation of results, recording and reporting, and management requirements.
This document is applicable to determining the qualified work zone of a heat treatment furnace that meets the temperature uniformity requirements within the service temperature range. This document is not applicable to the work zone in the continuous furnaces without fixed process temperature or required temperature uniformity. This document may be used as a reference by other heating equipment
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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/Platinum-6% Rhodium thermocouple wires
GB/T 2614 Nickel-Chromium/Nickel-Silicon thermocouple wires
GB/T 2903 Copper/Copper-Nickel (Constantan) 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 4993 Nickel-Chromium/Copper-Nickel(Constantan) thermocouple wires
GB/T 4994 Iron/Copper-Nickel (Constantan) thermocouple wires
GB/T 5977 Platinum wires for resistance thermometers
GB/T 7232 Terminology of metal heat treatment
GB/T 13324 Terminology of heat treatment equipment
GB/T 16839.1 Thermocouples - Part 1: EMF specifications and tolerances
GB/T 17615 Nickel-Chromium-Silicon/Nickel-Silicon-Magnesium thermocouple wires
GB/T 18404 Mineral insulated metal-sheathed thermocouple cables and thermocouples
GB/T 30825 Pyrometry for heat treatment
JB/T 8901 Sheathed noble metal thermocouple cables
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 7232, GB/T 13324 and GB/T 30825 as well as the following apply.
3.1
process temperature
heating temperature specified by the heat treatment process according to the purpose of workpiece heat treatment and the type of material
3.2
temperature uniformity
uniformity of the temperature within the qualified work zone of the heat treatment furnace, i.e. the maximum deviation of the temperature of each test point within the qualified work zone from the set temperature
Note: It is usually expressed as "±℃".
3.3
qualified work zone
working space in a heating furnace, determined through temperature detection to meet the process temperature and temperature uniformity of heat treatment
3.4
previewed qualified work zone
temperature measurement space assumed in advance according to the structure, control mode and other conditions of the heat treatment furnace before testing in order to determine the qualified work zone of a heat treatment furnace, generally the working space specified by the heat treatment furnace manufacturer or relevant standards
3.5
no load test
test for determining the qualified work zone in the heat treatment furnace without workpieces or substitutes
3.6
load test
test for determining the qualified work zone in the heat treatment furnace with workpieces or substitutes
3.7
initial test
test of the qualified work zone to determine the qualified operating zone, working temperature range and furnace category, for the heat treatment furnaces just put into production, undergoing overhaul or technical transformation, or going through maintenance, change or adjustment during use
3.8
periodic test
regular test of the qualified work zone of heat treatment furnace during use
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification of heat treatment furnaces by temperature uniformity
5 Initial test and periodic test of qualified work zone
6 Test system
7 Test methods
8 Test and evaluation of qualified work zone
9 Record and report
10 Management
Annex A (Informative) Record for test on qualified work zone
Annex B (Informative) Certificate for test on qualified work zone
