This standard specifies the general technical requirements for commonly used quenching media in heat treatment. This standard applies to three types of media used in the quenching of metal materials and their products: water-based aqueous solutions, oils, and hot baths. This standard does not include quenching media such as metal-containing fluidized beds and gases. JB/T 6955-1993 Technical requirements for commonly used quenching media in heat treatment JB/T6955-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T6955-93
Technical requirements for commonly used quenching media in heat treatment
Published on July 27, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1994
Mechanical Industry Standard of the People's Republic of China
Technical requirements for commonly used quenching media in heat treatment
1 Subject content and scope of application
This standard specifies the general technical requirements for commonly used quenching media in heat treatment. This standard applies to three types of media used in the quenching of metal materials and their products, namely water and aqueous solutions, oil, and hot bath. This standard does not include quenching media such as metal baths, fluidized beds, and gases. 2 Reference standards
GB1919
GB3095
GB8121
GB9449
JB4392
JB4393
JB4406
ZBJ36007
ZBE45003
Industrial sodium hydroxide
Industrial sodium carbonate
Machinery oil
Potassium hydroxide
Atmospheric environment Quality standards
Terminology of heat treatment process materials
Test method for cooling performance of quenching medium
Method for determining the performance of water-soluble organic quenching medium Technical conditions for synthetic quenching agent of polyvinyl alcohol
General provisions of heat treatment safety technology
Salt for heat treatment
Method for determining the cooling performance of quenching oil
3.1 Inorganic aqueous solution quenching medium
Aqueous solutions of different concentrations composed of inorganic salts and alkalis for quenching cooling. 3.2 Organic aqueous solution quenching medium
Aqueous solution composed of organic high molecular polymers and additives for quenching cooling. 3.3 Special quenching oil
Additives are added to mineral oil to provide quenching oil for different heat treatment process requirements. 3.4 Additives
A small amount of substances added to improve the performance of the quenching medium. Classification of commonly used quenching media
Class I: Water and aqueous solutions
Class II: Oil
Inorganic aqueous solutions
Organic aqueous solutions
Machinery oil
Special quenching oil
Approved by the Ministry of Machinery Industry on 1993-07-27
JB/T 695593
Implemented on 1994-07-01
Class III: Hot bath
5 Technical requirements
JB/T6955-93
The raw materials used for quenching media shall comply with the relevant standards and technical conditions. 5.1
5.1.1 Inorganic salts shall comply with the provisions of ZBJ36007; 5.1.2 Alkali shall comply with the provisions of GB210, GB209 and GB1919. 5.1.3 Organic matter shall meet the special technical conditions of the product, such as polyvinyl alcohol synthetic quenching agent concentrate shall meet the provisions of JB4393. 5.1.4 Mechanical oil shall meet the technical conditions of GB443. 5.1.5 Special quenching oil shall meet the enterprise standard of the manufacturer or the special technical conditions of the corresponding product. Raw materials entering the factory must have a certificate of qualification and batch re-inspection shall be carried out when necessary. 5.2 The general technical requirements of commonly used quenching media are shown in Table 1, and their cooling performance is shown in Appendix A (reference). Table 1
Tianjin quenching medium
Water and aqueous solution
Zhangzhou quenching oil
Inorganic aqueous solution
Organic aqueous solution
Machine oil
Special quenching oil
General technical requirements
Clean, flowing (or circulating, stirring); water temperature 20~40C, cooling performance of tap water see Table A1
Select concentration as required; common concentration (5%15%》; high concentration (≥20%, saturated concentration); liquid temperature 20~45C; circulation or stirring; pH value 6.5~8.5; cooling performance of salt and alkali aqueous solution see Table A2
Select concentration according to special product technical conditions and requirements Low concentration, medium concentration, high concentration (depending on the medium) Liquid temperature 20~50C; stirring or circulation pH value 6.5- 8.5 (or as per special regulations); cooling performance of several organic aqueous solutions is shown in Table A3
According to GB443 technical conditions; conventional oil temperature 20~80C; hot oil temperature>100C; circulation or stirring; cooling performance of mechanical oil is shown in Table A5
Select different quenching oils according to process requirements (fast, bright isothermal, vacuum), technical conditions are as per special oil regulations: oil temperature should be lower than the flash point 80~100℃; stirring or circulation; cooling performance is shown in Table A5www.bzxz.net
Use temperature fluctuation range ±20C; select formula according to required bath temperature (see Table A7); nitrate bath fluoride ion ≤0.3%, sulfate ≤0.5% pH value 6.5~8.5 Use temperature fluctuation range ±10: select formula according to requirements (see Table A7) carbonate ≤4%
rate ignition medium should not be used for heat treatment Parts will be seriously rusted. Application range
Carbon structural steel, carbon tool steel, alloy structural steel, vanadium, aluminum alloy, copper alloy, titanium alloy
Carbon structural steel, alloy structural steel, carbon
C tool steel
Carbon structural steel, alloy structural steel, shaft
bearing steel, spring steel, carbon tool steel, alloy tool steel, aluminum alloy
Carbon tool steel (section <5mm), alloy structural steel, alloy tool steel, bearing steel, spring steel, high-speed steel
Carbon structural steel with C content ≥0.45%,
Carbon tool steel, alloy structural steel, alloy tool steel, high-speed steel
Specific technical conditions or process operation procedures for the use of high-temperature ignition medium should be formulated; safe operation of high-temperature ignition medium should comply with JB4406 standard JB/T6955-93
5.2.3 The ignition medium should be non-toxic and odorless, and its impact on the environment should comply with the provisions of GB3095. When toxic media must be used, strict protection and safe operation measures must be taken. 5.2.4 Suspended matter and sediment in the quenching tank should be removed in time. 5.3 Analysis items and analysis cycles are shown in Table 2. Table 2
Fire medium
Aqueous solution
Salt bath, alkali bath
Analysis items
Main component content, concentration, density, viscosity, pH value viscosity (or viscosity ratio), residual carbon increase, moisture, cooling performance
Chloride ion, carbonate, sulfate, water and insoluble content, pH value, component ratio change
Note: ①Analysis items are allowed to be selected or added according to the specific situation of the fire medium. ②Analysis cycle is allowed to be extended or shortened according to actual production conditions. Analysis
JB4392
GB9449
ZBE45003
ZBJ36007
GB1919
Continuous use once a week
Continuous use once for three months
Once every month
After stirring the quenching medium evenly, take an appropriate amount of samples from the representative part or the center of the quenching tank for analysis and testing. 5.3.1
If it does not meet the technical requirements after analysis, it should be adjusted appropriately until it is replaced. 5.3.2
JB/T 695593
Appendix A
Cooling performance of commonly used quenching media
(reference)
According to the test method of GB4994, the cooling performance of several commonly used quenching media was measured. For reference when using quenching media. A1 Water and aqueous solutions
A1.1 The cooling performance of tap water at different temperatures, when stationary and circulating, is shown in Table A1. A1.2 The cooling performance of inorganic salt aqueous solution at 20°C, when stationary, is shown in Table A2. A1.3 Cooling performance of organic aqueous solution at 20℃, static, see Table A3. Physical properties of quenching medium concentrate for preparing aqueous solution, see Table A4. Table A1
Quenching medium
Tap water
Quenching medium
Sodium chloride aqueous solution
Calcium chloride aqueous solution
Sodium carbonate aqueous solution
Sodium hydroxide aqueous solution
Note: According to JB4392 determination method.
Density\
Maximum cooling rate
Temperature
Maximum cooling rate
Temperature
Average cooling rate
(200~300℃)
Average cooling rate
(200~300℃）
Fire medium
Polyvinyl alcohol aqueous solution
CL-1 poly
Ether aqueous solution
903 polyether aqueous solution
Polyacrylic acid
Sodium aqueous solution
Fire medium
(concentrated solution)
Polyvinyl alcohol synthetic quenching agent
CL-1 polyether fire agent
903 polyether fire agent
PAS-1 polyacrylic acid
Sodium fire agent
Light yellow viscous liquid
Yellow viscous liquid
Brown viscous liquid
Light brown viscous liquid
Note: 1) According to the determination method of JB4392.
JB/T6955-93
Maximum cooling rate
Temperature
A2.1 The cooling performance of mechanical oil at different temperatures is shown in Table A5. A2.2. The cooling performance of special quenching oil at different temperatures is shown in Table A5. The physical properties of the oil for testing are shown in Table A6.
MPa·s
Average cooling rate
(200～300）
Refractive index
N15 mechanical oil
N32 mechanical oil
2# ordinary quenching oil
Quick quenching oil
Bright quenching oil
1# graded quenching oil
Vacuum quenching oil
Machine oil
2# ordinary quenching oil
Quick quenching oil
Bright quenching oil
1# graded quenching oil||tt ||Vacuum quenching oil
Salt bath, alkali bath
13.5~16.5
(40℃)
28.8~35.2
(40℃)
<30(40℃)
14(100℃)
37.2(40℃)
24.9(50℃)
JB/T.6955-93
220℃
For the formula and use temperature of salt bath and alkali bath, please see Table A7.6
Maximum cooling rate
Temperature
mgKOH/g
Additional instructions:
JB/T6955--93
Ingredients
45%NaNO,+55%KNO,
50%NaNO,+50%KNO,
75%NaNO,+25%KNO
55%NaNO:+45%NaNO
55%KNO,+45%KNO
50%KNO,+50%NaNO||t t||55%KNO,+45%NaNO,
46%NaNO,+27%NaNO+27%KNO,
75%CaCl,+25%NaCI
30%KCl+20%NaCI+50%BaCl
65%KOH+35%NaOH
80%KOH+20%NaOH-10%H,0
80%NaOH+20%NaNO
This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery. Melting point
This standard was drafted by the Beijing Electromechanical Research Institute of the Ministry of Machinery, and the Second Automobile Manufacturing Plant participated in the drafting. The main drafters of this standard are Yang Shufan and Chen Shoujie. Working temperature
230~550
230~550
280~550
230~550
230~550
150~550
150~550
140~260
540~580
580~800
1703G0
150~300
280~550
People's Republic of China
Mechanical industry standard||t t||Technical requirements for commonly used quenching media in heat treatment
JB/T6955-93
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (PO Box 8144, Beijing
Postal Code 100081)
Copyright reserved
Reproduction is prohibited
Format 880×12301/16 Printing sheet 3/4 Number of words 14,:: First edition May 1994 First edition May 1994, Printing number 00,001-500 Price 6.00 yuan
No. 13990
80%NaOH+20%NaNO
This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery. Melting point
This standard was drafted by the Beijing Electromechanical Research Institute of the Ministry of Machinery, and the Second Automobile Works participated in the drafting. The main drafters of this standard are Yang Shufan and Chen Shoujie. Working temperature
230~550
230~550
280~550
230~550
230~550
150~550
150~550
140~260
540~580
580~800
1703G0
150~300
280~550
People's Republic of China
Mechanical industry standard||t t||Technical requirements for commonly used quenching media in heat treatment
JB/T6955-93
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (PO Box 8144, Beijing
Postal Code 100081)
Copyright reserved
Reproduction is prohibited
Format 880×12301/16 Printing sheet 3/4 Number of words 14,:: First edition May 1994 First edition May 1994, Printing number 00,001-500 Price 6.00 yuan
No. 13990
80%NaOH+20%NaNO
This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery. Melting point
This standard was drafted by the Beijing Electromechanical Research Institute of the Ministry of Machinery, and the Second Automobile Works participated in the drafting. The main drafters of this standard are Yang Shufan and Chen Shoujie. Working temperature
230~550
230~550
280~550
230~550
230~550
150~550
150~550
140~260
540~580
580~800
1703G0
150~300
280~550
People's Republic of China
Mechanical industry standard||t t||Technical requirements for commonly used quenching media in heat treatment
JB/T6955-93
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (PO Box 8144, Beijing
Postal Code 100081)
Copyright reserved
Reproduction is prohibited
Format 880×12301/16 Printing sheet 3/4 Number of words 14,:: First edition May 1994 First edition May 1994, Printing number 00,001-500 Price 6.00 yuan
No. 1399
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