2.2 Batches
Bars shall be submitted for acceptance in batches, each batch shall consist of the same winning combination number, status and specifications.
2.3 Inspection items
Each batch of products should be tested before the delivery of chemical composition, dimensions and deviations, mechanical properties and appearance quality. Bars with a diameter greater than or equal to 20 mm should be made with low magnification, and quenched products should be examined for microstructure.
2.4 sampling
The sampling position and number of bars should meet the requirements of Table 8.
Table 8 Sample location and quantity of bars
Test Item Sample Site Number of Samples Required for Each Lot Sample Article Number of Test Method
Chemical composition at the time of casting (or on the bar)
Mechanical properties Extrusion front cuts 2% of each lot, not less than 2 3.4 4.3
Microstructure Heat Treatment Furnace High Temperature Zone Every Furnace (Batch) 2 3.6 4.5
Cut 2% of each batch at the end of low-power tissue extrusion, not less than 2 3.5 4.4
Overall dimensions - by root 3.3 4.2
Surface quality - by root 3.7 4.6
Note: When chemical composition analysis is performed, the supplier can take any part of the bar during sampling, retesting or arbitration when the casting is stable.
2.5 Determination of test results
2.5.1 When the chemical composition fails, the batch is rejected.
2.5.2 When the dimensions or surface quality fail, the root is judged as unqualified.
2.5.3 When the room temperature tensile mechanical properties are unqualified, the duplicate inspection shall be conducted by taking another double quantity of the sample from the lot (including the unqualified ones), and the lot shall be qualified when the retest is qualified. If the results of the re-inspection are still unsatisfactory, the batch is found to be unqualified, but the supplier is allowed to test one by one or re-heat-treat, sample test, and the qualified person is delivered.
2.5.4 When the microstructure fails, the batch is rejected.
2.5.5 In the low-power organization, the bars that have been shrunk, layered, and coarse-grained are allowed to be cut by the manufacturer for a period of retest until they pass, and the other bars in the lot should be subjected to the above-mentioned three defects. The larger length of the distribution is cut-off or test-by-root, and the qualified person is delivered. When there are other defects, the batch of products is negotiated by both parties.
3 signs, packaging, transportation, storage
3.1 Signs
3.1.1 The following marks shall be marked on the front end of the bars for acceptance inspection (or the following signs shall be affixed):
Inspection of the technical supervision department of the supplier;
The winning combination number;
Supply status
Serial Number.
The packaging box mark of the product shall meet the requirements of GB/T3199.
3.2 Packaging, Transport and Storage
Bars are not oiled and do not pack paper. When the demander requests oiling or padding, it should be specified in the contract. Other packaging, transportation and storage requirements are in accordance with GB/T 3199.
3.3 Quality Certificate
Each batch of bar should be accompanied by a product quality certificate, which states:
Supplier name
product name;
Awards, availability, and specifications
batch number;
Net weight and number of pieces;
The test results of various analysis projects and the marks of the technical supervision department;
This standard number;
Packaging date (or factory date).
4 Content of the contract
The following items should be included in the contract (or purchase order) for ordering the products listed in this standard:
product name;
The winning combination number;
Supply status
specification;
Dimensions and Permissible Deviations (if not specified, they will be supplied at the ordinary level);
Weight (or number of roots);
This standard number;
Select the item (such as coarse-grained ring requirements, layered requirements. If not specified, follow this standard.)
Bars shall be submitted for acceptance in batches, each batch shall consist of the same winning combination number, status and specifications.
2.3 Inspection items
Each batch of products should be tested before the delivery of chemical composition, dimensions and deviations, mechanical properties and appearance quality. Bars with a diameter greater than or equal to 20 mm should be made with low magnification, and quenched products should be examined for microstructure.
2.4 sampling
The sampling position and number of bars should meet the requirements of Table 8.
Table 8 Sample location and quantity of bars
Test Item Sample Site Number of Samples Required for Each Lot Sample Article Number of Test Method
Chemical composition at the time of casting (or on the bar)
Mechanical properties Extrusion front cuts 2% of each lot, not less than 2 3.4 4.3
Microstructure Heat Treatment Furnace High Temperature Zone Every Furnace (Batch) 2 3.6 4.5
Cut 2% of each batch at the end of low-power tissue extrusion, not less than 2 3.5 4.4
Overall dimensions - by root 3.3 4.2
Surface quality - by root 3.7 4.6
Note: When chemical composition analysis is performed, the supplier can take any part of the bar during sampling, retesting or arbitration when the casting is stable.
2.5 Determination of test results
2.5.1 When the chemical composition fails, the batch is rejected.
2.5.2 When the dimensions or surface quality fail, the root is judged as unqualified.
2.5.3 When the room temperature tensile mechanical properties are unqualified, the duplicate inspection shall be conducted by taking another double quantity of the sample from the lot (including the unqualified ones), and the lot shall be qualified when the retest is qualified. If the results of the re-inspection are still unsatisfactory, the batch is found to be unqualified, but the supplier is allowed to test one by one or re-heat-treat, sample test, and the qualified person is delivered.
2.5.4 When the microstructure fails, the batch is rejected.
2.5.5 In the low-power organization, the bars that have been shrunk, layered, and coarse-grained are allowed to be cut by the manufacturer for a period of retest until they pass, and the other bars in the lot should be subjected to the above-mentioned three defects. The larger length of the distribution is cut-off or test-by-root, and the qualified person is delivered. When there are other defects, the batch of products is negotiated by both parties.
3 signs, packaging, transportation, storage
3.1 Signs
3.1.1 The following marks shall be marked on the front end of the bars for acceptance inspection (or the following signs shall be affixed):
Inspection of the technical supervision department of the supplier;
The winning combination number;
Supply status
Serial Number.
The packaging box mark of the product shall meet the requirements of GB/T3199.
3.2 Packaging, Transport and Storage
Bars are not oiled and do not pack paper. When the demander requests oiling or padding, it should be specified in the contract. Other packaging, transportation and storage requirements are in accordance with GB/T 3199.
3.3 Quality Certificate
Each batch of bar should be accompanied by a product quality certificate, which states:
Supplier name
product name;
Awards, availability, and specifications
batch number;
Net weight and number of pieces;
The test results of various analysis projects and the marks of the technical supervision department;
This standard number;
Packaging date (or factory date).
4 Content of the contract
The following items should be included in the contract (or purchase order) for ordering the products listed in this standard:
product name;
The winning combination number;
Supply status
specification;
Dimensions and Permissible Deviations (if not specified, they will be supplied at the ordinary level);
Weight (or number of roots);
This standard number;
Select the item (such as coarse-grained ring requirements, layered requirements. If not specified, follow this standard.)