QB/T 3773-1999 Epoxy phenolic type coated tin (or chrome) steel sheet
Some standard content:
Classification number: Y70
Light Industry Standard of the People's Republic of China
OB/T3773-1999
Epoxy phenolic type coated
Tin (or chrome) plate
Published on April 21, 1999
State Bureau of Light Industry
Implemented on April 21, 1999
QB713773-1999
This standard is the original national standard GB8230-1987 "Epoxy phenolic type coated (or chrome) plate", which was re-issued by the Light Industry Bureau in 1999 with the standard number QB/T3773-1999. The standard is issued by the National Food Standardization Center of the State Administration of Light Industry of China. This standard is the responsibility of the China Food Industry Research Institute. Light Industry Standard of the People's Republic of China
Forged (shear cone chrome) steel sheet (or FCcs) coated with the epoxy-phenol type coating QB/T3773-1999
This standard is the general specification for epoxy-phenol type coating (or other primer coating) coated (or cast) steel sheet. This standard should be used in conjunction with the corresponding aluminum (or aluminum) steel sheet technical standards and product instructions. If necessary, certain tests that both parties consider necessary should be carried out to verify the characteristics of the steel sheet used. The production method of the products involved in this standard is the authority of the manufacturer: the use method of the product is the authority of the user, and both parties should communicate with each other. 1 Technical requirements
1.1 Appearance quality requirements
1. 1.1 The coating should be smooth and flat, with a consistent color, no glaze and no rust. No glaze or scorch is a serious defect.
1.1.2 The coating is allowed to have a scratch that penetrates the film. On an area of 712mm×508mm, the length of the scratch should not exceed 25cm. If it exceeds 500nm, it is a serious defect.
1.7.3 On an area of 712mm×508mm, the coating is allowed to have less than three areas (<50mm×50mm) with less than 5 impurity points of 1mm in length.
If there are more than 5 impurity points in the above areas, it is a serious defect. 1.1.4 On the surface of 712mm×506mm, there are no more than three air pockets with a diameter less than 2mm. In the lower area (50mm×50mm), each area contains no more than 10 air bubbles with a diameter less than 1mm and greater than 0.2mm. If there are more than 5 air bubbles in the above air-limited areas, it is a serious defect. 1.1.5 The upper edge along the printing direction should not exceed 3mm. The right side should not exceed 2mm. If the upper and lower edges exceed 5mm, it is a serious defect.
1.1.6 There is a small amount of damage to the frame. There is a serious defect.
1.1.7 The coating is not allowed to be piled up and the color band is not dense. It is a production defect. 1.t. When leaving a blank for printing, the error of the position and width of the blank band should not exceed 1.0mm, otherwise it is a serious defect. 1.1.9 For products with dimensions exceeding 712mm×508mm, the thickness should be increased in proportion to the above requirements. 1.2 Physical and chemical indicators
t. 2.1 Thickness
The coating thickness is expressed in coating disc (g/m\). According to the following classification thickness classification
Approved by the State Bureau of Light Industry on 1999-21
Dyeing film quantity. g/m
5. 5~-8. 0
3. 0 -~4. 0
To the whole board. g/mt
Implemented on 1999-04-21
QB/T3773-—1999
For specific purposes, thickness specifications other than those specified in the above table may be used by agreement. 1.2.2 Xie Jianli
Class A products should not be inferior to V!
Class B products shall not be inferior to [forging
Class C products shall not be inferior to ■ domain,
1.2.3 Strength resistance
The average value of Class A products shall not be lower than Class I: The average value of Class B products shall not be lower than Class I. 1.2.4 Acid corrosion resistance
No peeling, discoloration, or whitening after the test. 1.2-5 Sparse corrosion resistance
After the test, there are no obvious sulfur spots, no peeling, 1.2.6 Impact resistance
After the test, there are no dense corrosion points.
1.2.7 Folding resistance
After the test, there shall be no cracks when observed with a 10° magnifying glass. 1.2.8 Category C products are limited to the four indicators mentioned in 1.2.3~1.2.7. 1.3 The inspection of various technical requirements shall be included in the order contract. When there are special technical requirements (whether appearance or physical and chemical indicators), they shall be included in the order contract after the two parties have agreed. 2 Test method
2.1 Appearance inspection method
Experienced personnel shall use visual inspection. In case of doubt, 5~10 times magnifying glass can be used for inspection. 2-2 Test piece cutting
Test pieces for physical and chemical inspection shall be cut from the designated parts as shown in 1 on the designated sample sheets with a knife. In the figure, the area within 25mm from the edge cannot be used for inspection.
2.3 Determination of film removal
2.3.1 Cut three 50mm×50mm test pieces from the designated parts. Clean with acetone, dry by self-heating, and measure with an analytical balance to the 10th decimal place.
2.3.2 After heating to 90~95℃ with 3%~5% RH, use the test piece as the electrode and stainless steel as the resistor, and use 4~~6V DC to strip the film. After stripping, use a small rod to gently wrap the film until it is completely stripped, and quickly wash it with water to dry it. After this process, the thin target surface plate will be free of strain.
2.3.3 After cooling, weigh the stripped test piece again, and measure the value to the decimal place. 2.3.4 Subtract the second weighing value from the first weighing value, and then multiply it by 400 to get the number of film (g/mL). The film coating amount of the test piece should be the arithmetic average of the two test pieces.
2.4 Adhesion force determination
2.4.1 Load a 110mm×25m Use three test pieces of 70-100 mm in length and 10 mm in diameter on a scribe line with a pitch of 1.5 mm. Or use a small blade, a multi-edged tool and a ruler to scratch a grid pattern with a pitch of 1.0 mm. The number of scratches on each side should be 6 to 11. Use a brush to remove chips. In this operation, the blade width of the knife is 50 to 100 mm. The scratch should penetrate the membrane. 2.4.2 Withdraw 80~100mm of the full-length tape with a width of 15mm and a bonding strength of 15±2g/mm from the required surface, immediately stick it on the polyester strip, press it firmly with the first joint skin, and leave a small section as a support. 2
QB/T3773—1999
1-Measurement of recording volume (50alm×5Gmm), 2-Measurement of adhesion (110mm×25mm), 3-Measurement of acid value (50mm×50mm), 4-Measurement of degradation resistance (100mm×250m), 5-Measurement of resistance (10%mm×25mm) 6-Measurement of disturbance (100mm×10mm), 7-Measurement of resistance (320mm×25mm, 8-Measurement of penetration (50mm×5Dmm), 9-Test of secondary porosity (50m m×50mm) 2.4.3 The method for measuring the adhesive force of adhesive tape is as follows. Fix the adhesive tape on a freely rotatable shaft, then cut the tape 100m long and hang a small code plate, gently put the weight in the plate, when the weight of the weight is just enough to make the adhesive peel off from the base, and its separation speed is an average speed of 1mm/s, the suspension at this time is the total adhesive force of the tape. Therefore, the adhesive force can be calculated by the following formula: Adhesion force (g/lm) = total suspension weight (g)/tape width (mm) Note: For adhesive tapes, those with qualified adhesive force can be used. 2.4.4 Quickly tear off the tape from the film, and stick the torn tape on the back of the test piece. According to the amount of the film torn off, determine the level of adhesion of the test piece: 2.4. 5
1 level coating does not fall off completely
1 level coating exposure does not exceed 10%,
【 level coating exposure does not exceed 25%"
N level coating exposure does not exceed 50%,
Y level coating exposure does not exceed 75%+
M level coating exposure does not exceed 90%,
2.4.6 The arithmetic average of the three pieces is the adhesion level of the sample. 2.5 Corrosion resistance test
2.5.1 Three 50mm×50mm test pieces from the designated position are welded on the surface, and the back and corners are sealed with beeswax 2.5.2. Next, the reverse formula is used to prepare the proposed corrosion filtration: citric acid (analytical grade) 50g
sodium nitrate (analytical grade) 137mg
vitamin C (analytical grade) 500mg
add water to 1000mL
. For some specific products, other media can be used after verification by both parties. Q/T 37731999
2.5.3 Add the newly prepared simulated corrosion solution into the test pool, and immerse the test piece in the filter. Use a 44×10mm stainless electrode as the cathode and the test piece as the anode. Connect a 15V direct current power supply and filter the corrosion for 1 hour. Remove the test piece, wash it and observe the size and distribution of the corrosion spots.
2.54 According to the corrosion status, grade it according to the following standards: 0: No corrosion spots at all
1: At most 10 small spots with a length of 1mm and 5 spots with a length of 2mm; 2: At most 30 small spots with a length of 1mm and 10 spots with a length of 2mm; 3: There are a few, relatively comprehensive small spots; 4: There are complete and dense small spots, 1~3 large spots with a diameter of more than 4mm; 2. 5.5 The arithmetic half-mean of the three test pieces is used to determine the corrosion resistance of the sample. 2.6 Acid corrosion test 2.6.1 Two 100mm×25mm test pieces hidden from the designated position are repeatedly separated into blocks with a spacing of 3mm. Then they are placed in a special seal (2.9×1%mm) filled with 400mL of 5% (for Class A products) acetic acid solution (for Class B products). In order to ensure the consistency of the test strength, 16 test pieces should be installed in the upper container. 2-6.2 Place the test sealer in a high-pressure container and raise the plate for about 15 minutes until the temperature reaches 121℃ (about 1 gauge pressure). After 31mia, reduce the pressure and take out the sample. Wash and straighten it. Observe the dehumidification and color change of the sample. 2.7.1 Two 10 cm × 25 mm test pieces cut from the designated parts are stacked into a square with a spacing of 3 mm and placed in a special sealed container (72.9 × 109 mm) containing 400 mL of 1% sodium hydroxide (analytical grade, containing water) adjusted to pH 5.5-6.0 by lactic acid. To ensure the test intensity, there should be 16 test pieces in the above container. 2.7.2 Place the test container in the commercial container, heat it for 15 minutes to a temperature of 121°C (about 1°C) for 30 minutes, then cool it down, take out the sample, wash it, straighten it, and observe the film release and color change of the sample. 2.8 Impact test
2.8.1 From the designated location, the test piece will be punched into two pieces with a diameter of ~9m. With the consent of the party, it can also be tested by seam arrangement.
2.8.2 The can is 50% immersed in alkaline copper solution. After 30 minutes, take it out and wash it, and observe the corrosion condition.2.9 New test
Two pieces of 10mm×25mm test pieces from the designated location will be bent 180% around a stainless steel cylinder with a diameter of 2mm2.10 Standard test
After the supply and demand parties agree, in addition to the above-mentioned tests, the product can also add transmittance and porosity tests. 2.10.1 The permeability test method is as follows: five pieces of 50mm×50mm test pieces are taken out, and the back is welded with equal wire +, and then the ridge, edge and corner are sealed with beeswax to ensure that the test can only penetrate the micropores of the coating film to the substrate. 2.10.2 Place the above test piece and the stainless steel electrode of size X×10mm in the test cell of contact with the liquid specified in 2.6.2 at the same time. 2-10.3 After soaking for 24 hours, disconnect the electrode with a sound, and measure the capacitance and dielectric loss tangent of the film at a frequency of 1000Hz (about 100mV). The dielectric penetration value (C) represents the permeability of the coating, and the dielectric loss tangent (t) represents the leakage condition of the film. Under control, the leakage voltage value (R) of the film can be calculated: K=Exigs
or: R——electric capacitance value, R/25cm*C——capacitance μF/25cm*
C and the values are directly read, and the arithmetic average of the three samples after removing the minimum and maximum measured values represents the capacitance and dielectric loss tangent of the sample. The capacitance value of product A QB/T3773—1999
should be less than 0.10μF/25cm and the dielectric loss tangent should be less than 1. The capacitance value of product B should be less than 0.25+F/25cm+ dielectric loss tangent should be less than 1.5
2.10.5 The method for determining the cross-sectional area capacitance value is as follows: 1-5.1 Prepare a test piece with a stainless steel electrode of type 1×10trm, connected to the two poles of a 15V, 51mA current power supply, and an ammeter is connected in series in the circuit. 2-10.6 Insert the sample and the inductor that have been energized into a mixed solution of copper sulfate (1.5%) and 1% acetic acid, and read the current value immediately.
The larger the above-mentioned voltage is, the more through holes there are. As a reference value, the average value of the voltage of the three test pieces should be below 10mA for Class A products and below 3mA for Class B products.
3 Inspection rules
3.1 Sample sampling method and quantity
3.1.1 In order to verify the representativeness of the description, several packages of products of the same specification delivered weekly should be called a batch, and every 20 packages should be randomly divided into several full batch groups. The remainder of less than 20 packages should also be counted as a batch. 3.1.2 One package is randomly selected from each batch for inspection. When the batch is less than 20 packages, two packages should be selected for control inspection. 3-1.3 For each package to be inspected, 7 samples should be randomly and continuously selected from the upper, middle and lower positions, for a total of 21 samples, one of which is subjected to enhanced inspection, and the other 20 samples are used for appearance inspection. 3-2 The 20 packages from the oil inspection package shall be inspected for appearance. When the number of unqualified packages is less than 4, it shall be determined as the appearance inspection package of the cargo group represented by the inspection package is qualified. 3.3 When the number of unqualified packages is equal to or more than 4, another package shall be selected from the cargo group for inspection. At the same time, the package with qualified packages shall be determined as qualified for appearance inspection. If there is a package that does not meet the standards, it shall be judged as unqualified for appearance inspection of the cargo group. 3-4 When the cargo is less than 20 packages, both packages shall be inspected. If there is a package that does not meet the standards, it shall be re-inspected according to 3.2. 3.5 The selected package shall be inspected for physical and chemical inspection. When all items are passed, it shall be determined as qualified for physical and chemical inspection of the cargo group. 3.6 If some items of physical and chemical inspection are unqualified, another package shall be taken from the inspection package for re-inspection. If all items are passed, the whole set of goods is judged as qualified; if not, one sheet should be taken from the other two packages of the other set of goods, and tested again. At this time, if all items of physical and chemical tests of the two sheets are passed, the whole set of goods is judged as qualified; if any one of them is unqualified, the physical and chemical test of the whole set of goods is judged as unqualified. 3. If both the chemical and visual inspections are qualified, the whole set of goods will be judged as authentic, and the chemical inspection will be qualified. If the appearance inspection is defective, the whole set of goods will be judged as a substandard product. If the physical and chemical inspection is unqualified or the appearance inspection is defective, the whole set of goods will be judged as defective. 3.8 Plating pot (or link) > Thin steel plate itself may have defects: such as spots, pitting, white spots, waterlogging, etc., which should not be considered as problems with printing depth. 4. Packaging, transportation, storage
4.1 The packaging of the product should be firmly tied to the transportation, and the original packaging should be used as much as possible. 4. The product should be protected from moisture and other harmful environments during transportation. 4.3 When delivering the product, the parcel should have a product inspection form, and each parcel should be affixed with a product factory form. The format and filling are as shown in 5
QE/T 3773—1999
Factory product inspection list
Product name
Substrate production class
Substrate specifications
Appearance style
Acid resistance
Carbon impact
Product name
Except for waist density (g/m*)
External quality
Same (batch)
China, agent
0.23X712X505.||t t||560015
Production date
Coating source
Inspection result
Factory product delivery list
865015
Film thickness 1g/ut)
Corrosion resistance (flange)
Death positionbZxz.net
Board production standard
Substrate specification
Physical and chemical properties
Product number 1
Other decoration
1985. 9.1.
Haizhou Oil Polymer Factory
China, Wuhan Iron and Steel
0.23X712x503
4.4, under the normal circumstances, both parties in the supply chain shall conduct their own inspections. When there is a dispute between the two parties, they shall jointly conduct arbitration, or entrust the National Food Quality Inspection Center to conduct the inspection.
Additional notes:
This standard is proposed by the Ministry of Light Industry of the People's Republic of China and is under the jurisdiction of the Northern Food Fermentation Industry Scientific Research Institute of the Light Industry of the People's Republic of China.4. Under normal circumstances, both parties in the supply chain shall conduct their own inspections on product quality. When there is a dispute, they may jointly conduct arbitration, or entrust the National Food Quality Inspection Center to conduct the inspection.
Additional notes:
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is under the jurisdiction of the Northern Food Fermentation Industry Scientific Research Institute of the Light Industry of the People's Republic of China.
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