This standard specifies the classification, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of continuous hot-dip galvanized steel strip with a width of less than 700mm. This standard is applicable to cold-rolled continuous hot-dip galvanized steel strip with a width of less than 700mm and a thickness of 0.25mm to 2.50mm. GB/T 15392-1994 Continuous hot-dip galvanized steel strip with a width of less than 700mm GB/T15392-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Continual hot-dip zinc-coated steel stripswith width less than 700 mm1 Subject content and scope of application
GB/T 15392-94
This standard specifies the classification, size, appearance, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of continuous hot-dip galvanized steel strips with width less than 70 tM (hereinafter referred to as steel strips). This standard is applicable to cold-rolled continuous hot-dip galvanized steel strips with a width of less than 700 mm and a thickness of 0.25 mm~2.50 mm. 2 Reference standards
GB 228
GB 247
GB1839
Metal extension tensile test method
Metal bending test method
General provisions for acceptance, packaging, marking and quality certificate of steel plates and steel strips Method for determination of zinc layer weight of galvanized steel plates (strips) GB2975
GB 4156
GB6397
3 Classification
Sampling provisions for mechanical and process properties tests of steel materials Metal cupping test method (thickness 0.2~2 mm) Metal tensile test specimens
The classification and symbols of steel strips shall be in accordance with the provisions of Table 1. Table 1
Classification method
According to processing performance
Approved by the State Bureau of Technical Supervision on December 22, 1994
General use
Machine-made bite
Ultra-deep drawing and aging resistance
Implemented on October 1, 1995
Classification method
According to layer weight
According to surface structure
According to surface quality
According to dimensional accuracy
According to surface treatment
4 Size and shape
Zinc-iron alloy
4. 1 The nominal size of the belt shall be as specified in Table 2. GB/T 15392—94
Continued Table 1
Normal zinc flower
Small zinc flower
Bright zinc flower
Zinc-iron alloy
Ordinary precision
Higher sugar content
Acid quenching
Chromic acid passivation and oiling
Inner diameter of coil
GB/T15392—94
0. 25 - 0. 50
200-~150
Note: If the purchaser has special requirements, it shall be in accordance with the agreement between the supply and demand parties. 4.2 The allowable deviation of the thickness of the strip shall be in accordance with the provisions of Table 3. Table 3
Nominal size
10-~≤.700
Allowable thickness deviation
Nominal thicknesswww.bzxz.net
250~700
±11
Nominal width
.o. 04
250～2.700
=0, 06
0. 5 ~2. 5
400~610
The maximum allowable thickness deviation within 30m of the head and end of the steel strip shall not exceed 50% of the value specified in Table 3. The maximum allowable deviation of the thickness within 20m of the weld zone of the steel strip shall not exceed 100% of the value specified in Table 3, mm
>250~700
. 0. 10
According to the requirements of the purchaser, when supplying the middle specification steel strip with nominal thickness in Table 3, the allowable deviation of its thickness shall be the same as the provisions of the adjacent small size. Upon agreement between the supply and demand parties, steel strips with negative thickness deviation can be provided, and the tolerance band remains unchanged. 4.3 The allowable deviation of the width of the steel strip shall be in accordance with the provisions of Table 1. 0. 25
Nominal bending
GB/T15392-94
: 125
4.4 The maximum value of the sickle bend of the steel strip shall be in accordance with the provisions of Table 5. Table 5
Nominal roughness
4.5 Roughness of steel strip According to the provisions of Table 6,
4.6 Marking example
Maximum value of sickle bend
Allowable deviation of width
Maximum value of roughness
0. 70~1. 2
Measuring length
0. 7U-~1. 2
The weight of zinc layer is 275g/m, the processing performance is structural type, the surface structure is normal zinc flower, the surface treatment is oiling, the dimensional accuracy is ordinary accuracy, the minimum size is 0.50mm×400mm, the steel strip is marked as: Strip 275 JG-ZP-0. 50X400-GB/T 15392±-94 I Technical requirements
5.1 Brand and chemical composition
The brand and chemical composition shall be selected by the supplier. Chemical composition can be provided when required by the purchaser; the purchaser can also specify the brand after agreement between the supply and demand parties.
5.2 Performance
The performance of steel strip shall be in accordance with the provisions of Table 7 and Table 8. Zinc
180° bending test
d-bending center diameter
2-sample thickness
GB/T15392-94
Tensile strength
270-500
270--380
270380
Bending point Φ
Elongation 8
Cupping test
See Table 4|| tt||See Table 4
180″Cold test
t-Bending center diameter
a-Sample thickness
Nominal thickness
GB/T15392-94
Cupping test Punching depth, not less than
Processing performance
Note: According to the requirements of the purchaser, when making strips with intermediate specifications of nominal thickness in Table 8, the punching depth shall be in accordance with the provisions of the adjacent small size, 5. 2. 1
When the zinc layer is bent, the zinc layer is not allowed to fall off beyond 5㎡m from the edge of the specimen, but cracks that do not expose the steel base are allowed. When the steel base is cold-bent, cracks and delamination are not allowed to appear at the bending part of the specimen. For 3JG steel strip, the tensile strength meter is for reference, and the minimum tensile strength value can be agreed upon by the supplier and the buyer. 5.2. 3
1 For steel strips with a thickness greater than 2.0mm, the punching depth of the cupping test can be agreed upon by the supplier and the buyer. 5.2.4
5CS After the strip is polished by the supplier, it is guaranteed that no slip line will be generated during deep drawing within six months. 5.2.5
6SC After the strip is polished by the supplier, it is guaranteed that no slip line will be generated during deep drawing within eight days. 5.2. 6
5.3 Weight of zinc layer
The weight of zinc layer shall be in accordance with the provisions of Table 9,
Type of layer
Zinc-iron alloy
GB/T 1539294
The average value of two-point test
(double-sided) shall not be less than
5.3.1001 The weight of zinc layer is less than 100g/m2, and the specific weight shall be agreed upon by the supply and demand parties. 85
Minimum value of three-point test
5.3.2 If the demand party has no specific requirements for the weight of zinc layer, except for the zinc-iron alloy bond layer which is supplied at 120g/m2, the others shall be supplied at 275g/m2. 5.3.3 Upon agreement between the supply and demand parties, 5.4 Surface requirements
5.4.1 The surface structure of the zinc layer shall be in accordance with the provisions of Table 10. Table 10
Surface structure
Normal zinc flower
Small zinc flower
Light zinc flower
Zinc-iron alloy
Zinc flower obtained by crystallization at the normal belt cooling rate is specially controlled. The size of the zinc flower is smaller than the normal zinc flower. The small zinc flower is subjected to light finishing treatment
The bond layer on the base metal is composed of zinc-iron alloy,Especially zinc spangle, generally dull
The surface quality of the strip shall be in accordance with the provisions of Table 11.
·General use
Suitable for painting and other uses where normal zinc spangle cannot meet the requirements. For deep drawing and deep drawing processing with high surface finish requirements.
Suitable for certain uses of direct painting, no pretreatment is required before painting (except for cleaning of the positive strip).
Steel strips are allowed to have individual abnormal parts. When required by the purchaser, the names of defects recorded in the production process can be provided for reference. Surface structure
Bright zinc flower
Normal zinc flower
Small zinc flower
Iron alloy
Zinc layer brand
GE/T15392-94
Surface quality
Appearance is uniform, without any surface defects. Slight scratches, indentations, and uneven zinc flowers are allowed. Small corrosion points, uneven zinc flower spots, slight scratches and indentations, small salt treatment defects, small zinc particles and zinc scars are allowed.
In addition to the surface defects allowed, edge cracks not larger than 1mm, local slight zinc layer undulations, slight folds and width not larger than 20mm are also allowed. mm Slightly galvanized thick edge and slight pitting due to the original plate
Uniform color, slight scratches, indentations and chromate spots are allowed. Uneven color and slight scratches, indentations and chromate spots are allowed. Note: Except for special agreements between the supply and demand parties, the instrument shall inspect one side. 5.4.3 The combination of processing performance and surface structure shall be in accordance with the provisions of Table 12. When the demand party has no requirements for the surface structure, it shall be supplied according to normal zinc spangles. Table 12
Surface structure
Processing performance
Normal zinc spangles
Small zinc spangles
Bright zinc spangles
Ferroalloys
Note: The symbol △ in the table indicates that there is a product.
5.4.4 Surface treatment is divided into chromic acid passivation, oiling and chromic acid passivation plus oiling. The demand party can choose one of the three surface treatment methods and indicate it in the contract. If the purchaser has no requirements, the goods shall be supplied after chromic acid passivation treatment. 6 Test methods
GB/T15392-94
6.1 The inspection items for each batch of steel strips shall be in accordance with the provisions of Table 13. Table 13
Processing properties
Note: The symbol √ in the table indicates a mandatory item: 6.2 The test methods for steel strips shall be in accordance with the provisions of Table 11. Inspection Items
Weight of zinc layer
Detailed method
GR2975
GB 6397 Sample P9
GB2975
GB2975
Test method
GB4156
GB1839
GB 232
Weight of zinc layer
Test after zinc layer removal
Test after zinc layer removal
Specimen width 80+5mm
Area of ​​each specimen 50 cms
6.3 The thickness of the steel strip is measured with a ruler or caliper. The width, bend and unevenness are measured with a sample, caliper or ruler. 6.4 The appearance of the steel strip is inspected with the naked eye.
6.5 The measurement method of the camber of the steel strip shall be as specified in Figure 1. Wet length
6.6 When checking the unevenness of the steel strip, place the steel strip on the platform and measure the shortest distance between the steel strip and the platform. 6.7 Thickness measurement position: for steel strips with a width greater than 40mm, the distance from the edge shall not be less than 20mm; for steel strips with a width less than 40mm, the measurement shall be made in the middle of the steel strip. 7 Inspection rules
7.1 The steel strips shall be inspected in batches, and each batch shall consist of steel strips of the same grade, size, zinc layer weight, performance, surface structure, and surface quality. 5% (but not less than 5 rolls) of each batch of steel strips shall be selected, and samples shall be cut from the head or tail of the selected steel strip rolls to inspect the performance.
7.2 Sampling location for steel strip performance test: For steel strips with a width greater than 340 mm, the sampling shall be carried out in accordance with the provisions of Figure 2. For steel strips with a width less than 340 mm, the sampling shall be carried out along the rolling direction of the steel strip, and the spacing between the samples shall not be less than 200 mm. 50
Square spacing
1—Steel base pulling test: 2—Steel base ling test 13—Zinc layer bending test 4—Copper base cupping test 5. Zinc layer weight test 7.3 Re-inspection and other acceptance rules for steel strips shall be in accordance with the provisions of GB247. 8 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel strips shall be in accordance with the provisions of GB 247. Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was jointly developed by the Information Standards Research Institute of the Ministry of Metallurgical Industry. This standard was drafted by Harbin Strip Steel Plant and the Information Standards Research Institute of the Ministry of Metallurgical Industry. The main drafters of this standard were Feng Chunfu and Huang Dong. This standard level mark
GB/T15392-·94I
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