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GB/T 22560-2008 English PDF (GBT22560-2008)

GB/T 22560-2008 English PDF (GBT22560-2008)

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GB/T 22560-2008: Gas nitrocarburizing of iron and steel parts

This standard specifies the requirements for common materials, equipment, process, inspection, energy consumption, safety and hygiene for nitrocarburizing of steel parts, in nitrogen and carbon-containing gas media. This standard applies to the gas nitrocarburizing treatment of steel parts.
GB/T 22560-2008
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.200
J 36
Gas nitrocarburizing of iron and steel parts
ISSUED ON: DECEMBER 06, 2008
IMPLEMENTED ON: JUNE 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Process classification code ... 6
5 Parts for nitrocarburizing ... 6
6 Gas nitrocarburizing equipment and process materials ... 8
7 Gas nitrocarburizing treatment ... 9
8 Quality requirements and quality inspection ... 11
9 Specimen inspection and inspection equipment ... 13
10 Energy consumption requirements ... 13
11 Safety, health, labor protection requirements ... 14
12 Product report ... 14
Gas nitrocarburizing of iron and steel parts
1 Scope
This standard specifies the requirements for common materials, equipment, process, inspection, energy consumption, safety and hygiene for
nitrocarburizing of steel parts, in nitrogen and carbon-containing gas media. This standard applies to the gas nitrocarburizing treatment of steel parts. 2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) 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 536-1988 Liquid Anhydrous Ammonia
GB/T 699 Quality carbon structural steels
GB/T 700 Carbon structural steels (GB/T 700-2006, ISO 630:1995, NEQ)
GB/T 1182 Geometrical product specifications (GPS) - Geometrical
tolerancing - Tolerances of form orientation location and run-out (GB/T 1182- 2008, ISO 1101:2004, IDT)
GB/T 1299 Alloy tool steels
GB/T 1348 Spheroidal graphite iron castings
GB/T 3077 Alloy structure steels
GB 3095 Ambient air quality standard
GB/T 7232 Terminology of metal heat treatment
GB/T 8121 The terminology of technological materials for heat treatment GB/T 9439 Grey iron castings
GB/T 9452 Testing method for work zone of heat treatment furnace
GB/T 11354 Determination of nitrided case depth and metallographic
microstructure examination for steel and iron parts
GB/T 12603 Classifications and designations for metal heat treatment
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 17358 Power consumption measurement and testing in heat treating
production
GB/T 19944 Fuel consumption quota and its counting and testing method
for heat treating production
JB/T 6050 Generalization of hardness test for heat treated iron and steel parts
JB/T 9209 Technical requirement of medium for thermo-chemical treatment JB/T 9199 Technical requirements of stop-off paints
JB/T 9218 Non-destructive testing - Penetrant testing
JB/T 10175 Quality control requirement for heat treatment
3 Terms and definitions
The terms and definitions, as established in GB/T 7232, GB/T 8121, GB/T 13324, as well as the following terms and definitions, apply to this standard. 3.1
Parts for nitrocarburizing
Workpieces, which are machined or subjected to appropriate preliminary
heat treatment, in preparation for nitrocarburizing.
3.2
Nitrocarburized parts
The workpiece after gas nitrocarburizing treatment is completed.
3.3
Nitrocarburizing layer
6.1.4 The atmosphere in the furnace can be adjusted. The exhaust gas shall be fully burned.
6.1.5 The furnace shall be equipped with a device to prevent overheating. 6.2 Temperature measurement & control device
6.2.1 The temperature measurement and temperature control device shall
comply with the provisions of JB/T 10175.
6.2.2 The heating chamber of the periodic furnace AND each heating zone of the continuous furnace shall be equipped with its own automatic temperature control and recording device.
6.2.3 Within the predetermined processing temperature range, the total
temperature error, which is indicated by the instrument, shall not exceed ??3 ??C. 6.3 Maintenance of equipment
Equipment shall be regularly repaired, according to requirements, to maintain the normal state of the equipment. It shall keep its maintenance records. 6.4 Commonly used penetrants
The technical indicators of the penetrants shall comply with the provisions of JB/T 9209.
6.4.1 Organic compounds, which contain nitrogen and carbon atoms, such as triethanolamine, formamide, etc., can be used alone or together with other organic compounds.
6.4.2 Use the ammonia as main gas. Add any kind of gas, such as alcohol cracking gas, carbon dioxide, endothermic atmosphere, exothermic
atmosphere. The quality of ammonia gas shall meet the requirements of the first-class products in GB 536-1988.
7 Gas nitrocarburizing treatment
7.1 Preparation before processing
7.1.1 Confirm the technical requirements of the parts for nitrocarburizing, including the nitrocarburized location, the nitrocarburized depth, the surface hardness, the metallographic structure, etc.
7.1.2 Use appropriate methods to remove oil stains and rust spots, on the surface of the parts for nitrocarburizing.
7.1.3 Parts for nitrocarburizing, which is to be subject to partial nitrocarburizing, shall be treated with anti-seepage treatment. The anti-seepage agent shall comply with the provisions of JB/T 9199.
7.1.4 Perform stress relief treatment on slender, thin-walled precise parts for nitrocarburizing. The treatment temperature is generally 20 ??C higher than the nitrocarburizing temperature; it shall be kept for a sufficient time; the anti- oxidation measures shall be taken.
7.1.5 Select process equipment; check piping system, heating equipment, control instruments, etc.
7.1.6 The specimens for testing shall be placed together with the furnace. The material, pretreatment, processing conditions of the specimens shall be the same as the parts for nitrocarburizing.
7.2 Furnace loading
7.2.1 When using the material basket (fixture), it shall check its safety performance in advance; remove oil stains.
7.2.2 The workpiece shall be installed in the effective heating area. Pay attention to the furnace loading method, loading amount, loading position, mutual gap of the workpiece and the specimen; prevent the distortion of the workpiece; ensure a good circulation of the atmosphere in the furnace.
7.3 Gas nitrocarburizing process
7.3.1 The heating rate, nitrocarburizing temperature, atmosphere composition, nitrocarburizing time shall be set and controlled, according to the material and technical requirements of the workpiece.
7.3.2 During the treatment process, attention shall be paid to the fluctuation of furnace temperature and the amount of infiltration agent added; the exhaust speed should be fast after entering the furnace; preheating measures can be taken, if necessary.
7.3.3 The commonly used nitrocarburizing temperature is 520 ??C ~ 570 ??C. 7.3.4 The commonly used nitrocarburizing time is 2 h ~ 4 h.
7.4 Cooling
7.4.1 Oil is usually used as the coolant. Other coolants can also be selected, according to technical requirements.
7.4.2 If the surface color is required, the cooling process after nitrocarburizing shall be carried out, in a nitriding atmosphere or other protective atmosphere.

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