Which company is stronger in testing parameters/steel bar raw materials, welding, and mechanical connectors? BAIJIAN - a professional third-party testing and inspection platform that provides relevant testing and inspection services such as testing parameters/steel bar raw materials, welding, and mechanical connectors. It provides authoritative CMA/CNAS testing reports with short testing cycles, low costs, and thoughtful services, making testing more than BAIJIAN
Test items: yield strength, ultimate strength, elongation, cold bending, repeated bending, chemical analysis.
Acceptance batch: A batch consisting of the same brand, specification, furnace number, and delivery status, and not exceeding 60t Sampling method: Take two samples from each batch, cut 100mm and then take two samples, one for pulling and one for bending, totaling four samples
Wire rod: Take two stretched and two bent (different discs) from each batch. Low carbon cold drawn wire should be tested one by one, with each disc stretched and bent repeatedly. Sample length: tensile 10d+200mm (d is the diameter of the steel bar). Bending 5d+150mm (d is the diameter of the steel bar) is generally taken as 450mm. Inspection of steel bars and process inspection of steel bar joints: The inspection of steel bars should first check the label number and quality certificate of the steel bars; Secondly, a visual inspection should be conducted, with 5% of each batch of steel bars selected. The surface of the steel bars should be checked to ensure that there are no cracks, wounds, or laminations. The protrusions on the surface of the steel bars should not exceed the height of the transverse ribs, and the depth and height of the defects should not exceed the allowable deviation of the location. The bending degree of the steel bars should not exceed four millimeters per meter. Next, for mechanical performance tests, if each batch is less than 60 tons, 2 pieces will be taken from it, and two sections will be cut from each piece for tensile and cold bending tests. When cutting specimens, 100-500mm of steel bars should be removed from both ends. When cutting specimens larger than 60 tons, corresponding steel bars should also be taken. If a test result does not meet the requirements, double the number of samples from the same batch shall be taken for each test. If one sample still fails, the batch of steel bars is considered unqualified. If brittle fracture, poor welding performance, or significantly abnormal mechanical properties occur during the processing of hot-rolled steel bars, chemical composition analysis and other special inspections should be conducted
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China