Steel is the main building material for bridge construction. It combines many advantages such as light weight, high strength, good plasticity and toughness, superior seismic resistance, high degree of industrial assembly, significant comprehensive economic benefits, beautiful appearance, and compliance with green buildings. Highly favored by architects and structural engineers, it is widely used in various types of buildings. So what items do steel need to be tested for? These inspection contents below have been organized and quickly collected
Physical properties: Experimental testing of physical performance indicators in the performance inspection of metal plastic processing products, mainly including magnetic properties, density, elastic modulus, thermal expansion coefficient, resistance value, etc Chemical properties: intergranular corrosion experiment, antioxidant performance experiment, atmospheric corrosion experiment, full immersion, inter immersion corrosion experiment, etc Electrical performance: magnetic property measurement, density measurement, elastic modulus measurement, expansion coefficient measurement, resistivity measurement, etc Process performance: hardenability experiment, welding performance experiment, cutting performance experiment, wear experiment, metal bending experiment, metal repeated bending experiment, metal wire repeated bending experiment, metal wire torsion experiment, metal wire winding experiment, metal fracture experiment, metal cupping experiment, etc
Tensile performance: hardness index (specified non proportional elongation stress, specified total elongation stress, specified residual elongation stress, yield point, tensile strength), plastic index (elongation rate; section elongation rate), high-temperature creep test (creep speed, endurance strength limit, endurance elongation after fracture, endurance section shrinkage rate), etc Hardness: Brinell hardness, Rockwell hardness, Vickers hardness, microhardness, Shore hardness, etc Chemical composition: Analysis of the content of C, S, P, Mn, Si, Cr, Ni elements Macroscopic inspection: Determination of microstructure and macroscopic defects of killed steel, continuous cast steel, and boiling steel, acid immersion test, tower shaped hairline acid immersion test, sulfur imprinting test, fracture inspection, etc
Metallographic inspection: Metallographic microscope detection of decarburization depth (GB/T224-1987), grain size detection, detection of non-metallic inclusions in steel, chemical composition segregation detection in steel, etc Non destructive testing: ultrasonic testing, magnetic testing, radiographic testing, specification and size testing, surface defect testing, etc Impact experiments: high and low temperature impact experiments, multiple impact experiments, etc
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