GB/T 20492-2019Zinc-5% aluminum-mixed mischmetal alloy - coated steel wire and steel wire strand (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 20492-2006 "Zinc-5% aluminum-mixed rare earth alloy coated steel wire, steel strand", and GB/T 20492- Compared with.2006, the main technical changes are as follows:

--- Removed the mechanical properties of galvanized steel wire at various levels under the C-grade coating of steel wire (see Table 4 to Table 8, Table 4 of the 2006 edition);

--- Removed the weight of the C grade coating in the steel coating (see Table 2, Table 5 of the 2006 edition);

--- Removed the weight of the D grade coating in the steel wire coating for steel strands (see Table 16, Table 13 of the 2006 edition);

--- Increased the minimum breaking tensile test method for steel strands. by testing the sum of the breaking tension of the stranded steel wire in the strand Calculate the minimum breaking force of the strand (see 15.10);

--- Added 4 grade strength and 5 grade strength galvanized steel wire, and specified its performance parameters (see Table 7 and Table 8);

---Modified the winding test mandrel diameter of the 3-stage strength galvanized steel wire with the nominal diameter in the range of 2.75mm~5.50mm 5D changed to 4D (see Table 6, Table 4 of the 2006 edition);

--- Revised the strength code in the "Modeling Method for Galvanized Steel Wire Product Types for Overhead Stranded Wires", using "Class 1, Class 2, Class 3, Class 4 and Level 5" (see Table 4 to Table 8, Table 4 of the 2006 edition);

---Order content, test methods, packaging, signs, quality certificates have been detailed in accordance with China's national conditions (see Chapter 4, Chapter 8, Chapter 11, Chapter 15, Chapter 18).

1 Scope

This standard specifies the zinc-5% aluminum-mixed rare earth alloy coated steel wire (hereinafter referred to as steel wire), steel strand (hereinafter referred to as steel strand) Class, order content, technical requirements, test methods, inspection rules, packaging, marking and quality certificates.

This standard is applicable to the manufacture of steel wire for overhead stranded wire; suitable for overhead power ground wire, communication cable, hanger, suspension, tethering and fixed objects Steel strands used. The alloy coating product is suitable for applications requiring corrosion resistance and tensile strength.

Note: The technical specifications of steel wire are specified in Chapters 3 to 9 of this standard. The technical specifications of steel strands are specified in Chapters 10 to 16.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 228.1 tensile testing of metallic materials - Part 1

GB/T 239.1 Metallic materials and wires - Part 1

GB/T 701 low carbon steel hot rolled strip

GB/T 1839 steel product galvanized layer quality test method

General provisions of GB/T 2103 wire inspection, packaging, marking and quality certificate

GB/T 2104 General provisions for wire rope packaging, marking and quality certificates

GB/T 2972 galvanized steel wire zinc layer copper sulfate test method

GB/T 2976 metal material wire winding test method

GB/T 4354 high quality carbon steel hot rolled wire rod

GB/T 8358 wire rope actual breaking tensile force determination method

GB/T 21839 Test method for steel for prestressed concrete

GB/T 24242.2 Non-alloy steel wire rods for yarns - Part 2: General purpose wire rods

Numerical correction of YB/T 081 metallurgical technical standard and determination of test value

YB/T 5357 steel wire zinc or zinc-5% aluminum alloy

YS/T 310 alloy ingot for hot dip galvanizing

3 Wire classification