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GB/T 34882-2017 English PDF (GBT34882-2017)

GB/T 34882-2017 English PDF (GBT34882-2017)

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GB/T 34882-2017: Induction hardening and tempering of iron and steel parts

This Standard specifies the basic requirements for quality control, safety and health and labor protection of induction hardening and tempering of the surface of iron and steel parts. This Standard applies to induction hardening and tempering of the surface of iron and steel parts and the heat treatment process of induction hardening.
GB/T 34882-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.200
J 36
Induction hardening and
tempering of iron and steel parts
ISSUED ON. NOVEMBER 01, 2017
IMPLEMENTED ON. MAY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
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 ... 6
4 Induction hardening and tempering process code ... 6
5 Workpiece to be processed ... 7
6 Induction hardening and tempering equipment ... 10
7 Induction hardening and tempering process and operation ... 13
8 Quality requirements and inspection ... 15
9 Quality acceptance ... 17
10 Safety and health and labor protection requirements ... 18
11 Energy consumption and environmental protection requirements ... 18
12 Product report ... 18
Induction hardening and
tempering of iron and steel parts
1 Scope
This Standard specifies the basic requirements for quality control, safety and health and labor protection of induction hardening and tempering of the surface of iron and steel parts.
This Standard applies to induction hardening and tempering of the surface of iron and steel parts and the heat treatment process of induction hardening. 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 230.1 Metallic materials - Rockwell hardness test - Part 1. Test method (scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 699 Quality carbon structure steels
GB/T 1182 Geometrical Product Specifications (GPS) - Geometrical
tolerancing - Tolerances of form, orientation, location and run-out
GB/T 1220 Stainless steel bars
GB/T 1221 Heat-resistant steel bars
GB/T 1222 Spring steels
GB/T 1298 Carbon tool steels
GB/T 1299 Tool and mould steels
GB/T 1348 Spheroidal graphite iron castings
GB/T 3077 Alloy structure steels
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1. Test method GB/T 4341.1 Metallic materials - Shore hardness test - Part 1. Test method GB/T 5216 Structural steel with specified hardenability bands
GB/T 5617 Determination of effective depth of hardening after induction or flame hardening of steel
GB/T 6967 Martensitic stainless steel castings for general engineering
application
GB/T 7232 Terminology of metal heat treatment
GB/T 8121 The terminology of technological materials of heat treatment
GB 8702 Controlling limits for electromagnetic environment
GB/T 9439 Grey iron castings
GB/T 9440 Malleable iron castings
GB/T 9452 Testing method for working zone of heat treatment furnace
GB/T 10201 Regulations of proper usage of electricity in heat treatment industry
GB/T 11352 Carbon steel castings for general engineering purpose
GB/T 12603 Classifications and designations for metal heat treatment
GB/T 13314 General specifications of forged steel work rolls for cold rolling GB/T 13324 Terminology of heat treatment equipment
GB 15735 Requirements for the safety and health in production process of metal heat treatment
GB/T 15822.1 Non-destructive testing - Magnetic particle testing - Part 1. General principles
GB/T 16923 Normalizing and annealing of steel parts
GB/T 17358 Power consumption, measurement, and testing in heat treating production
GB/T 18254 High-carbon chromium bearing steel
GB/T 18449.1 Metallic materials - Knoop hardness test - Part 1. Test method GB/Z 18718 Energy saving directives for heat treatment
GB/T 19944 Fuel consumption calculation and measurement method in heat
treating production
GB/T 30822 Environmental protection technical requirements for heat
treatment industry
GB/T 32541 Quality control system for heat treatment
JB/T 3593 Heat treated sintered iron-based structural materials
JB/T 4120 Heavy forged alloy steel backup rolls
JB/T 6955 The specification of quenching medium for heat treatment
JB/T 9204 Metallographic examination of induction hardened steel parts
JB/T 9205 Metallographic examination of pearlitic graphite cast iron parts induction hardened
JB/T 9218 Non-destructive testing - Test method for penetrant testing
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 7232, GB/T 8121, GB/T 13324, GB/T 9452, GB/T 16923 and the following apply. 3.1
induction hardening and tempering
For the purpose of all or part of surface hardening of iron and steel parts, it is heated by induction heating to a temperature above Ac3 or Ac1 point, and cooled with a suitable cooling medium (quenching); then to adjust the hardness and increase the toughness, it is heated in a tempering furnace or by induction heating to a suitable temperature below Ac1 point and then cooled (tempering). 3.2
distortion
Relative to the workpiece to be processed, change in form or size of the workpiece after heat treatment.
4 Induction hardening and tempering process code
The surface induction hardening and tempering process code of iron and steel 7 Induction hardening and tempering process and
operation
7.1 Workpiece to be processed
Check and confirm the material, status, form, size and appearance of the workpiece to be processed according to the requirements of 5.2. The surface of the workpiece to be processed shall have no scale, burrs or oil stains which may affect the induction heating quenching and tempering. Descaling,
deburring and washing if necessary.
7.2 Induction hardening and tempering equipment
7.2.1 Check and confirm that the induction power supply is in the power-on state, no abnormal alarm, the cooling water flows normally, and it is in the heating standby state.
7.2.2 Set the temperature of the equipment?€?s cooling water tank, confirm that the cooling water flow in each part is normal and no leakage. Set the
temperature of the quenching liquid tank according to the established heat treatment process; the quenching liquid pipeline system shall be no leakage; confirm the no-load quenching liquid flow by manual switch or button.
7.2.3 Check that the control and operating system is in the power-on state, no abnormal alarm.
7.2.4 Check the operation of the operating mechanism of each part of the equipment in manual mode.
7.2.5 According to the established heat treatment process, through the control and operating system interface of the equipment, preset the program
corresponding to the workpiece to be processed, including necessary
parameters and steps such as quenching heating and tempering heating output power or output voltage value, quenching and tempering heating time, location or displacement parameters, quenching cooling time, tempering cooling time, each action step.
7.3 Sensors and coolers
7.3.1 Select appropriate sensor and cooler for the workpiece to be processed and install.
7.3.2 Check and confirm if the sensor is deformed, damaged, and the state of the magnetizer meets the processing requirements.
7.6.2 When selecting the induction heating tempering method, use the
tempering sensor and cooler corresponding to the workpiece to be processed, select the corresponding program, and operate according to the same
procedure as specified in 7.5.
7.6.3 When selecting the tempering furnace method, according to the
established heat treatment process, set the tempering heating temperature and holding time before tempering.
7.6.4 According to the technical requirements of the workpiece, tempering is sometimes omitted. In the case of omitting tempering or using induction tempering, in order to avoid defects such as cracks in the workpiece, it shall be processed according to the material, form, processing conditions, etc. of the workpiece.
7.7 Straightening
After heat treatment, the workpiece to be straightened shall ensure that the residual stress generated by straightening does not hinder the subsequent machining and use, and if necessary, carry out the stress relief treatment. The stress relief treatment shall ensure the performance of the workpiece.
7.8 Record
Record the processing process according to the provisions and process
requirements, and keep it in a safe place. This shall be recorded if tempering is omitted.
8 Quality requirements and inspection
8.1 Appearance
The surface of the processed workpiece shall not have microcracks, melts, burns caused by induction hardening, and scratches and bumps that affect use. The appearance inspection shall be carried out by visual inspection and the crack shall be inspected according to any method specified in GB/T 15822.1 or JB/T 9218.
8.2 Surface hardness
The inspection of the surface hardness of the processed workpiece may be carried out according to the provisions of GB/T 230.1, GB/T 4340.1, GB/T 4341.1, GB/T 18449.1, using appropriate hardness tester. The hardness
deviation value shall comply with the allowable range listed in Table 9, Table 10 and Table 11. Table 11 shall comply with the provisions of JB/T 4120, and it is only applicable to certain large workpieces.

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