Some standard content:
Light Industry Standard of the People's Republic of China
Main content and scope of application of H62, H68 ordinary brass plates and strips for watches
QB/T1539-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of H62, H68 ordinary brass plates and strips for watches.
This standard applies to H62, H68 ordinary brass plates and strips for manufacturing watch parts. 2 Reference standards
GB/T4340 Metal Vickers hardness test method GB/T4342 Metal micro-Vickers hardness test method Brass chemical analysis methodbzxz.net
GB/T 5122
GB/T 8888
3 Product classification
Packaging, marking, transportation and storage of heavy non-ferrous metal processing products 3.1 This product can be divided into two categories: plates and strips. 3.1.1 Flat sheets are supplied as plates.
3.1.2 Coiled sheets are supplied as strips.
3.2 Sizes and specifications of plates and strips and their limit deviations 3.2.1 Sizes and specifications of plates and strips and their limit deviations shall be as specified in Tables 1 and 2. Table 1 Basic dimensions Limit deviations Normal precision Higher precision Approved by the Ministry of Light Industry of the People's Republic of China on July 6, 1992 Basic dimensions 80, 85, 90, 95, 100, 105, 110, Limit deviations Basic dimensions 800-1 200 Implementation on March 1, 1993 Basic dimensions Basic dimensions QB/T 15391992
Continued Table 1
Limit Deviation
Ordinary Accuracy
Higher Accuracy
Yutong Sugar Content
Higher Accuracy
Basic Size
95,100,105,
110,115,120
Basic Size
B0.85,90.
95,100,105,
110,115,120
Limit Deviation
Limit Deviation
Basic Size
800~1 200
Basic size
>12000
Basic size
QB/T1539--1992
Continued Table 2
Limit deviation
Ordinary accuracy
Higher accuracy
Basic size
80,85.90,
95,100.105,
110.115,120
Specifications and limit deviations not included in Table 1 and Table 2 can be negotiated between the supply and demand parties. 3.2.2
Limit deviation
Basic size
>6 000
3.2.3The thickness deviation accuracy should be indicated in the contract, otherwise it will be supplied according to ordinary accuracy. 3.2.4 The weight of each batch of deliverable short-size plates shall not exceed 20% of the total weight, and the length shall not be less than 600mm. The weight of the short-size strip shall not exceed 15% of the total weight, and the length shall not be less than 3000mm. 3.3 Supply status of plates and strips
Extra hard (T):
Hard (Y),
Semi-hard (1/2Y, Y);
Soft (M).
3.4 Marking example
Use H62 to make a 0.50mm thick and 100mm wide extra hard strip, and the thickness deviation is a higher precision. Marked as: Strip H62T0.50×100 Higher QB/T15394 Technical requirements
4.1 Chemical composition
The chemical composition of plates and strips shall comply with the provisions of Table 3. Alloy code
60.5~~63. 5
67. 0~70. 0
Note: Impurity content is not used as the basis for assessment, but the supplier must ensure that its total is not greater than the critical value. Impurity element content (not greater than)
4.2 Mechanical properties
QB/T1539—1992
Mechanical properties are based on the Vickers hardness test results and should comply with the provisions of Table 4. Table 4
Alloy code
85~120
75~110
1/2 Hard
110~140
110～140
Note: With the agreement of both parties, plates and strips with other hardness ranges can be supplied. 4.3 Appearance quality
140~160
140～160
4.3.1 The surface of the plate and strip should be smooth and free of cracks, pores, folds, inclusions, green rust, etc. Extra hard
155~175
155~175
4.3.2 Local slight scratches, spots, pits, embossing and other defects are not allowed to exceed half of the limit deviation of the thickness of the plate and strip. 4.3.3 After polishing and pickling, it is not allowed to have oxidation color that cannot be removed, darkening, redness, local slight oil stains and other defects. 4.4 Overall dimensions
4.4.1 The overall geometric dimensions and limit deviations of the plates and strips shall comply with the provisions in Table 1 and Table 2. 4.4.2 Plates and strips should be straight, and their transverse flatness should not exceed 1/100 of the width. 4.4.3 The side straightness of plates and strips should not exceed 4/1000. 4.4.4 Waves that cannot be eliminated after correction are not allowed to exist. The bevel of the head of the plate and strip should not exceed 5/100. 4.5 Surface roughness
Except for the soft state, the surface roughness R. value of plates and strips should not exceed 1.6um, and the surface roughness R. value of the hour, minute, second hand and dial strip should not exceed 0.8um.
4.6 Metallographic structure
The grain size of the soft strip should not exceed 0.055mm. The grain size will only be carried out when the purchaser has requirements and is specified in the contract. 5 Test method
5.1 Chemical composition
The analysis of chemical composition shall be carried out in accordance with the provisions of GB/T5122. 5.2 Mechanical properties
Hardness test is carried out with Vickers hardness tester or micro Vickers hardness tester in accordance with GB/T4340 or GB/T4342. 5.3 Appearance quality
Appearance quality of plates and strips is checked by visual inspection. 5.4 Overall dimensions
Measurement of geometric dimensions and form and position errors of plates and strips. The thickness is measured with a micrometer with an indication accuracy of 0 at 2mm from the edge, and the flatness is measured with a standard plug and a ruler. The side straightness and the head bevel are measured with a ruler and an angle ruler. 5.5 Surface roughness
Surface roughness is measured with a light cutting microscope. 5.6 Crystalline structure
Grain size test is carried out according to the estimation method of average grain size in copper and copper alloys
6 Inspection rules
.
6.1 Inspection and acceptance
6.1.1 The plate and strip shall be inspected and accepted by the supplier's technical supervision department, and the product quality shall be guaranteed to meet the standard requirements. 6.1.2 The buyer must complete the inspection and acceptance within two months from the date of receipt. 242
6.2 Batch
QB/T1539-1992
Plate and strip shall be inspected in batches. Each batch shall consist of materials of the same brand, specification and state, and the batch weight shall not exceed 2t. 6.3 Inspection items
Each batch shall be inspected item by item in accordance with Articles 4.1 to 4.6 of the technical requirements. 6.4 Sampling location and sampling quantity
6.4.1 During the melting and casting process, the supplier shall take one sample from each furnace for chemical composition inspection. 6.4.2 The buyer shall take one sample from each batch of plate and strip for chemical composition inspection. 6.4.3 Hardness test: Randomly select three sheets (rolls) from each batch, and take one sample from each sheet (roll). 6.4.4 The appearance quality and external dimensions of plates and strips shall be inspected sheet by sheet (roll). 6.5 Repeated test
Even if the test result of one sample fails in each test, double samples shall be taken from the batch to retest the unqualified item. If one sample still fails in the retest, the whole batch shall be scrapped or the supplier shall inspect each sheet (roll) and the qualified ones shall be individually batched for acceptance. Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of plates and strips shall be carried out in accordance with the provisions of GB/T8888. Additional remarks:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. This standard is drafted by Shanghai Clock and Watch Copper Material Factory. The main drafters of this standard are Wu Jinrong, Zhu Zhenhua and Gao Beirong. From the date of implementation of this standard, the former Ministry of Light Industry standard QB875--1983 "62 brass, 68 brass strips and belts for watches" will be abolished.
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