This part of GB/T 25020 specifies the product classification, technical requirements, inspection methods, inspection rules, markings and factory certificates, storage and transportation of square steel pipe pillars for electrified railway contact network. This section is applicable to square steel pipe pillars (hereinafter referred to as square steel pipe pillars) for electrified railway overhead contact systems. Similar square steel pipe pillars for overhead contact systems used in urban rail transit can refer to this section for implementation. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T470 Zinc Ingot GB/T 700 Carbon Structural Steel GB/T 709 Hot Rolled Steel Plate and Strip - Dimensions, Appearance Weights and Permissible Deviations GB/T1591 Low Alloy High Strength Structural Steels GB/T 2694 Technical Conditions for Manufacturing Transmission Line Towers GB/T3181 Paint Film Color Standards GB/T 4956 Measurement of Coating Thickness on Magnetic Substrates GB/T 5117 Magnetic Methods GB/T 5117 Non alloy and Fine Grain Steel Electrodes GB/T5118 Hot Strength Steel Electrodes GB/T5210 Paints and Varnishes Pulling Adhesion Test GB/T 5293 Carbon Steel Welding Wires and Fluxes for Submerged Arc Welding GB/T8110 Carbon Steel for Gas Shielded Arc Welding Low alloy welding wire GB/T 9286 Cross cut test for paint and varnish film GB/T 9761 Visual comparison of paint and varnish GB/T 11374 Non destructive measurement of coating thickness for thermal spraying GB/T 12470 Low alloy steel welding wire and flux for submerged arc welding
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