Some standard content:
ICS25.200
Machinery Industry Standard of the People's Republic of China
JB/T9210—1999
Vacuum heat treatment
Vacuum heat treatment
1999-06-24 Issued
National Machinery Industry Standard
2000-01-01 Implementation
JB/T9210-199V
This standard is a revision of ZDJ36.015—90 <Vacuum heat treatment>. This standard has some changes from ZBJ36015-90 in the following technical contents: The temperature deviation of the effective heating zone of vacuum furnace and vacuum tempering furnace shall not exceed ±10% to ±59%; The temperature deviation of the effective heating zone of vacuum annealing furnace shall not exceed ±15% to ±10%; The insulation resistance of the heating element of vacuum furnace and vacuum annealing furnace to ground shall be greater than 2k, and that of tempering furnace shall be greater than 500k; The insulation resistance of the heating element of vacuum furnace, tempering furnace and annealing furnace to ground shall be greater than 2k; Editorial changes have been made according to relevant regulations.
This standard replaces ZBJ36015-90 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Heat Treatment Standardization. The responsible drafting unit of this standard is Shanghai Machinery Manufacturing Technology Research Institute. The main drafters of this standard are Zhou Hengyue and Mei Zhijie. This standard was first issued on April 19, 1990. 1. National Machinery Industry Standard of the People's Republic of China Vacuum Heat Treatment Vacuum heat treatment JB/9210-1999 7BJ3603-90 This standard specifies the special requirements for vacuum heat treatment equipment, commonly used metal materials for vacuum heat treatment, the process and basic parameters of vacuum heat treatment.
This standard applies to vacuum back annealing, vacuum annealing, re-annealing, heat treatment and aging of low-carbon products.
The following standards contain provisions that constitute the provisions of this standard through reference in this standard. When this standard was published, the titles shown are valid. All standards will be revised. It is not possible to use the latest version of the standard when using the standards. GBT 230-. 1991
GE/T 23I:1984
GET 1818--1994
GB/T4340—1984bZxz.net
GR.T 10066.1.-1988
GB/T 10067.1—19B8
CB/T 10067.4—1988
GB 15735--1995
3 Common materials for vacuum heat treatment
Metal Rockwell hardness test method
Metal Brinell hardness test method
Metal surface Rockwell hardness test method
Metal Vickers hardness test method
Test methods for electric heating equipment General part
Basic technical conditions for electric heating equipment General part Basic technical conditions for electric heating equipment Indirect resistance furnace Metal potential treatment process safety and health requirements Alloy: tool steel, high temperature tool steel, bearing steel, heat resistant alloy, high temperature alloy, titanium alloy, precision alloy, etc. 4 Equipment
4.1 The technical parameters of vacuum heat treatment resistance furnace shall comply with the relevant provisions of GD/T10067.1&GB/T10067.4 4.2 Test items GD/T10066. 7. Test or check by the method specified in the relevant clauses: 4.3 The vacuum rate of the furnace, the vacuum tempering furnace, and the vacuum annealing furnace shall be effective. If the temperature deviation in the hot zone does not exceed ±5, the vacuum source shall be able to adjust, brake, control and record. 4.4 The vacuum degree of the furnace shall meet the relevant requirements of the process, and the vacuum leakage rate shall not be greater than [×10Pa: (,,) when the furnace is fully dry. 4.5 The vacuum furnace, the vacuum tempering furnace and the vacuum annealing furnace shall have a suction resistance to the ground of the heating element greater than 2k1. 4.6 The pressure of the cooling water shall be greater than 0.2MPa or determined according to the requirements of the connection, and the flow rate shall be adjustable, and sudden water cut-off is not allowed. 4: Between the gas source for air cooling and the furnace, there shall be a corresponding high-altitude pressure gauge that can accurately indicate the gas pressure and adjust the gas pressure. The pipe shall meet the requirements of the theory.
Approved by Beijing Machinery Industry Bureau on June 24, 1999, 2000-01-01 Zhang Dong
JB/192!0-1999
4.8 The purity of the cooling gas should be able to meet the requirements of the process. Steel should use 99.995% pure gas, and the remaining gas should use 9999% pure nitrogen or silver. Alloy should use 99.995% pure gas*1. 4.9 The transmission mechanism in the furnace should be stable and reliable, the operation should be accurate, and the opening and closing of the gate should be flexible. The kerosene should meet the requirements of the quality of the empty pole and the light height of the empty pole, and the product should not be deteriorated: the following is not strictly controlled to cause other harmful effects. The kerosene should be equipped with heating and stirring feeding, and the 4.11 point empty tempering should be equipped with a quick cooling device. 4.12 The vacuum heat treatment furnace should be in vacuum or filled state when not in use. 4.13 The vacuum heat treatment furnace should be inspected and maintained regularly and records should be kept. 5 Process
5.1 Preparation before treatment
5.11 The new part number, technical requirements, pre-heat treatment status and heat treatment specifications should be specified: 5.1.1 The parts and heat treatment equipment should be inspected: the workpiece should be free of chain damage, rust and other unacceptable surface defects, and the equipment should be in a good condition
5.1.3 The workpiece and fire tools should be cleaned and dried. 5.2 Loading the furnace
The workpiece should be placed in the effective heating zone of the furnace, and the correct loading method should be adopted according to the characteristics of spot heating. 5.3 Heating
After the workpiece is put into the furnace, wait until the air pressure reaches a certain value, generally 6.67Pa, then the piece can be heated. During the heating process, pay attention to the degassing condition and adjust the heating speed accordingly.
5.4 Preheating
. The workpiece should be preheated before reaching the predetermined heating temperature. When the preset heating temperature is 1000~1100℃, 800℃-preheating is generally used; when the preset heating temperature is between 1200℃ and 1.50℃, workpieces with simple shapes can be preheated once at 50℃, and workpieces with complex shapes can be preheated twice at 500~600℃ or preheated twice at 850℃, or preheated twice at 5.5℃. [The heating temperature of vacuum annealing is generally the lower limit of that of salt bath furnace and gas furnace. The heating temperature of vacuum annealing, point vacuum annealing and point vacuum solid solution aging is generally the same as the heating temperature of conventional treatment. 5.5.2 Vacuum heating and holding time - generally 3~5 times longer than that of salt furnace, and 1 time longer than that of air furnace: vacuum tempering heating holding time is slightly longer than that of air furnace, but 1~2 times longer than that of salt furnace: vacuum annealing heating holding time is generally 1 time longer than that of air furnace
5.5.3 Based on the material and heating temperature of the workpiece, the vacuum degree of heating is controlled by filling with high-purity nitrogen. When steel is heated below 90U, the vacuum degree is generally 1.3.1×10! When the temperature is between 900 and 1100%, the vacuum is about 13.3-1.33P; when the temperature is between 1100 and 1300%, the vacuum is about 13.3-663P8: 5.5.4 When the vacuum reaches a certain vacuum (about 0.135P), add pure nitrogen gas about 6.6×10*P to the furnace and gradually reduce the pressure with wind until the tempering is over. 5.6
5.6. Degas the furnace fully and heat appropriately when necessary. During the fire, the gas should be filled (high purity nitrogen or hydrogen 1 to 5.3×10T2, etc., and the kerosene should be stirred. JB/T9210-1999 5.6.2 According to the process requirements, use the core gas source or negative gas. When the positive gas is used, avoid using 2×10-6×10 high purity gas: when the negative gas is used, introduce 79×10~9.1×10Pa of negative pure gas to reduce the fire. The positive/negative gas method is used after the fire is completely heated. 5.6.4 Annealing method During the heat treatment, cool according to the process requirements. During the cooling process, the vacuum pump should be continuously drawn until the steam is completely exhausted. 5.7 Exit and exhaust treatment 5. 1. 1 Cold state,
S.7.2 Oil removal treatment is carried out in the furnace, 5 Correction
When the deformation of the workpiece exceeds the technical specification, the correct correction method should be used to correct it to meet the specified requirements. 6 Quality inspection
After the treatment, the workpiece should be inspected with the naked eye to ensure that there are no scratches, no obvious oxidation color, etc.2 Hardening
Mechanical inspection and supervision of the 5-63 alloy group specified in GBT230, GBT231, GB1818, UB/T4340! For parts with requirements for microstructure, inspection shall be carried out according to the regulations. 6.4 Deformation
The deformation of the parent should be within the scope of the technical requirements of the operation. The safety technology
shall be carried out according to the provisions of G15735.
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