JB/T 4390-1999 High and medium temperature heat treatment salt bath calibrator
Some standard content:
ICS25.200
J36
JB
Machinery Industry Standard of the People's Republic of China
JB/T4390-1999
High and medium temperature heat treatment salt bath calibration Agent
High and medium tempereture salt bath rectifier1999-06-24 released
National Machinery Industry Bureau
Released
Implemented on 2000-01-01
JB /T4390—1999
Foreword
This standard is a revision of JB439087 "High and medium temperature heat treatment salt bath calibrator". The difference between this standard and JB4390 is that the technical content related to a single calibrator in the original standard has been deleted, and editorial modifications have been made to the original standard in accordance with relevant regulations. This standard replaces JB4390-87 from the date of implementation. This standard is proposed and coordinated by the National Heat Treatment Standardization Technical Committee. This standard was drafted by: Chengdu Measuring Tools and Cutting Tools Co., Ltd. The main drafters of this standard: Ke Chuan and Xu Qiming. This standard was first published on April 29, 1987. 1 Scope
Machinery Industry Standard of the People's Republic of China
High and medium temperature heat treatment salt bath rectifier
High and medium temperature salt bath rectifierJB/T.4390—1999
Replaces JB4390—87| |tt||This standard specifies the general requirements, inspection rules, test methods, arbitration methods, packaging markings, storage and transportation of high and medium temperature heat treatment salt bath calibrators.
This standard is applicable to heat treatment high temperature neutral salt bath (working temperature 1000~1350℃) and medium temperature neutral salt bath (working temperature 700~1000℃) calibration agents.
2 Reference standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T 223.1--1981
GB/T 652—1988
GB/T 12661986
GB/T1298—1986
HG/T 2629—1994|| tt||3Definition
Determination of carbon content in steel and alloys
Chemical reagent chloride lock
Chemical reagent sodium chloride
Technical conditions of carbon tool steel| |tt||Chemical reagent octahydrate (hydroxide collar)
This standard adopts the following definitions.
3.1 Salt bath correction agent www.bzxz.net
A mixture of two or more substances that can restore or maintain the heating performance of the salt bath and prevent or reduce the oxidation and decarburization of the workpiece 3.2 Original carbon content
The carbon content of the sample before heating.
3.3 The remaining carbon content shows
the carbon content of the sample after heating.
3.4 ??Decarburization rate
The percentage of the difference between the original carbon content and the remaining carbon content of the sample and the original carbon content of the sample. 4 Requirements
4.1 - General requirements
The salt bath calibrator should have good correction effect, no explosion, no crusting, clear molten salt excitation, good fluidity, easy slag removal, no corrosion and no sticking. The workpiece and the residual salt on the workpiece are easy to clean and other requirements. The amount of toxic emissions during the use of salt bath calibrators should comply with relevant national laws and regulations. National Machinery Industry Bureau approved 2000-01-01 implementation on 1999-06-24
1
4.2 Calibration agent impurity content percentage
Sulfate (SO,)
Total Iron (Fe)
Loss on drying
Carbonate (co,)
Nitrate (NO,)
Note
≤0.5||tt ||≤0.15
≤1.0
≤0.3
Compliance with inspection
JB/T 43901999
1 Calibration containing chlorinated chopsticks and ammonium chloride agent, its weight loss on drying shall be agreed between the supply and demand parties. 2. For calibrators containing calcium silicate, the total amount should not exceed 1.0%. 3. The impurity content test method is formulated by the manufacturer according to the product model. 4.3 The anti-decarburization quality of the calibrator should comply with the requirements in Table 1. surface! Salt bath calibrator quality grading
Calibrator anti-stick carbon quality grading
Grade product
Second grade product
Third grade product
Go| |tt||1 The method of grading calibrators according to anti-decarburization quality shall comply with the provisions of Chapter 6 and Chapter 7. 2. The test results of the decarburization rate of the box slices (△C,) should be rounded to one decimal place. 5 Inspection rules
The decarburization rate of the box slices △C
%
0~ 25.0
25.1~45.0
45.1-65.0
5.1 The calibrator is inspected by the technical inspection department of the manufacturer. Each batch of products leaving the factory should be accompanied by a quality instruction sheet issued by the quality inspection department, which includes: manufacturer name, product name, batch number, quantity, proof that the product meets the requirements of this standard, and this standard number. 5.2 The user shall inspect whether the products received meet the requirements of this standard according to the technical requirements and inspection rules specified in this standard. The test method for testing impurities in the calibrator can be carried out according to the method provided by the manufacturer, or when necessary, it can also be carried out according to the method agreed between the supplier and the buyer. 5.3 Each batch of finished products shall be randomly sampled from 5% of the inner packages; when the number of inner packages is less than 20, samples shall be taken from at least one inner package. In the same batch, if there are different production batch numbers, samples should be taken separately according to the production batch numbers. Divide the sample into quarters and put it into a clean, dry and ground-stoppered wide-mouth bottle. Paste a label on the bottle and indicate: product name, batch number and sampling date, and send it to the inspection department for inspection. 5.4 If any indicator in the inspection result does not meet the requirements of this standard, resampling should be done from twice the amount of packaging. If even one indicator does not meet the requirements of this standard as a result of resampling and verification, the entire batch of products will not be accepted. 5.5 When the supply and demand parties have doubts about product quality, the arbitration unit will make a decision. 6 General test methods for the anti-decarburization quality of calibrators 6.1 Sample (foil)
2
JB/T4390—1999
6.1.1 The thickness of the box sheet raw material is specified to be 0.08 mm±0.01mm, cold-rolled T10 steel strip with a width of 30mm. The chemical composition of materials should comply with the regulations of GB/T1298.
6.1.2 Foil cut from steel belt, length 120mm. 6.1.3 The foil should be flat and smooth, without flash, burrs, rust or oil stains. 6.1.4 Take two box pieces, make a small hole at one end of the length direction, clean them with absolute ethanol and dry them. Pass the wire through the small hole, tie it firmly and tie it to a T-hook for later use. To prevent the foil from floating and fluttering in the salt bath, a weight can be hung on the wire binding the foil. 6.2 Equipment and heating range
6.2.1 The test equipment is a high-temperature neutral salt bath furnace or a medium-temperature neutral salt bath furnace for heat treatment under production conditions. 6.2.2 Foil heating specifications should comply with the requirements in Table 2. Table 2 Foil Heating Specifications
Test Equipment
High Temperature Neutral Salt Bath
Medium Temperature Neutral Salt Bath
6.3 Test Steps
6.3.1 Test The front salt bath should be removed according to the prescribed method. Mixing degree
c
1230 ±10
830 ± 10
time
min
5
20|| tt||6.3.2 Calibrator addition amount for the test: high-temperature salt bath is stipulated as 1% of the weight of dissolved salt; medium-temperature salt bath is stipulated as 0.5% of the weight of dissolved salt. 6.3.3 High-temperature salt bath is stipulated after using the calibrator Conduct the test for 2 hours. For medium-temperature salt bath, it is required to conduct the test 4 hours after using the calibration agent. 6.3.4 Calibrate the temperature of the salt bath with a thermocouple in advance, and then immerse the entire prepared foil into the area where the salt solution usually heats the workpiece. The immersion depth shall be approximately 80mm below the molten salt surface when the upper end of the foil is approximately 80mm below the surface of the molten salt. After the foil is heated according to the heating specifications specified in this standard, take it out and heat it quickly. Carefully remove the box pieces, first wash away the residual salt on the surface with distilled water, then soak it in absolute ethanol, dry it and store it in a desiccator for later use. 6.4 Sample analysis
Cut the two box pieces heated at the same time into pieces, mix them, and then analyze their carbon content according to GB/T223.1. 6.5 Calculation results
The foil decarburization rate 4C (%) is calculated according to formula (1): where: C. —Original carbon content of foil, %; remaining carbon content of C box sheet, %.
7 Arbitration test method 4c for the anti-decarburization quality of calibrators,-Co-c
Co
7.1 The specimen (box piece) should comply with the provisions of 6.1 7.2 Equipment, salt bath preparation and heating specifications
7.2.1 Equipment
The heating vessel is made of 1Cr18Ni9Ti with a thickness of about 5mm, and its internal size is Φ120mm ×340mm. 7.2.2 Salt bath preparation
(-)
3
JB/T4390-1999
7.2.2.1 Salt bath formula and preparation weight should comply with the provisions of Table 3 . Table 3 Formula and preparation weight of salt bath calibrator
Type of salt
Salt for high-mix salt bath
Salt for medium-wet salt solution
Chloride lock| |tt||99.8
69.1
Sodium chloride
30
%
Ferric hydrochloride
0.4||tt| |0.4
Hydrox Jaw
0.7
0.5
Configuration re-recording
kg
12
10|| tt||Note: The technical requirements of hydride (BaCI, ·2H,O), sodium hydride (NaCI) and hydroxide [Ba(OH), 8H,O) should comply with GB/T652, GB/T1266 and HG respectively. /T2629-1994 regulations. Iron hydroxide [Fe(OH),] is a chemical reagent. Put the prepared salt into the heating container, and then pour the heating container into the area where the high-temperature salt bath or medium-temperature salt bath usually heats the workpiece. The immersion depth of the container is about 60mm from the salt bath surface to the upper edge of the container mouth. After the salt in the container melts, add the prepared salt in batches until it is completely melted.
7.2.2.2 The salt bath should be kept warm for 2 hours. The high-temperature salt bath insulation temperature is 1230℃±10℃, and the medium-temperature salt bath insulation temperature is 850℃±10℃. 7.2.3 Foil heating specifications shall be carried out according to the provisions of 6.2.2. 7.3 The test steps shall be carried out according to the provisions of 6.3.2~6.3.4. 7.4 Sample analysis shall be carried out in accordance with the provisions of 6.4. 7.5 Calculation results shall be carried out in accordance with the provisions of 6.5. 8 Packaging, marking, storage and transportation
8.1 The sealing, storage and transportation of products should be packaged in a very reliable way. Under the premise of complying with 8.5, the user shall comply with the relevant provisions of Chapter 5 Inspection Rules when unpacking and inspecting the product within one year after leaving the factory. 8.2 The net weight of each package of calibrator shall not exceed 25k. It should be packaged in reliably sealed small bags, and the net weight of each inner package should be suitable for each usage.
8.3 A quality certificate should be attached to each package, including: manufacturer name, product name, batch number, production date, proof that the net weight product meets the requirements of this standard and this standard number. On the quality certificate of the calibrator, the product anti-decarbonization quality grade should be listed, and a brief description of the product calibration system should be attached. 8.4 The product packaging should be painted with a firm mark, including: manufacturer name, product name, net weight, batch number, model and trademark. 8.5 When storing and transporting products, they should be protected from rain, moisture and contamination by other items.
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