This part of GB/T 25020 specifies the technical requirements, inspection rules, test methods, markings, factory certificates, storage and transportation requirements for steel pillars of electrified railway contact network. This section is applicable to the contact grid steel pillars (hereinafter referred to as grid steel pillars) of electrified railways, and is not suitable for passenger dedicated lines. The same type of contact grid structure steel pillars used in urban rail transit can refer to this section for implementation. 2 Normative References: The clauses in the following documents are referred to in this part of GB/T 25020 and become the clauses of this part. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions do not apply to this section. However, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this section. GB/T 41 Hexagon Nuts, Grade C (GB/T 41-2000, eqv ISO 40341999, GB/T 95 Plain Washers, Grade C (GB/T 95-2002, eqv ISO 7091:2000) GB/T 97.1 Plain Washers, Grade A (GB/T 97.1-2002, eqv ISO 7089; 2000) GB/T 470 Zinc Ingots (GB/T 470-2008, ISO 752; 2004, MOD) GB/T 700-2006 Carbon Structural Steels (ISO 630; 1995, NEQ) GB/T 1591 Low Alloy High Strength Structural Steel GB/T 2694-2003 Technical Conditions for Manufacturing Transmission Line Towers GB/T 3098.1 Mechanical Properties of Fasteners, Bolts, Screws, and Studs (GB/T 3098.1-2000, idt ISO 898-1999) GB/T 3098,2 Mechanical Properties of Fasteners, Nut Coarse Thread (GB/T 3098,2-2000, idt ISO 898-21992) GB/T 5117 Carbon Steel Electrodes GB/T 5118 Low Alloy Steel Electrodes GB/T 5293 Carbon Steel Welding Wires and Fluxes 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