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Discussion On Armored Production Technology Of Steel Wire Armored Cable
Mar 09, 2018

Cables requiring greater mechanical strength shall have a armored layer. The most common type of armored cable is: Steel tape armored cable and steel wire armored cable. Steel wire armored cable is divided into coarse steel wire armored cable (commonly used for submarine cables and large outside diameter of power cable and other cables) and fine steel wire armored cable (often used for exploration cables, mine cables and control cables and other cables).


In the domestic cable market, steel tape armored cable occupies a larger share, while in the foreign cable market, the use of steel wire armored cable is more common. The most commonly used steel wire armored cable has steel wire armored power cable and steel wire armored control cable. Steel wire armored cable production, should strictly implement the relevant national standards and international standards (or related technical specifications), to ensure that the armored cable in its use process has a good stable structure and performance. The steel wire armored cable mainly executes the following 2 product standards and 2 related standards:


GB/t 12706-2008 "rated voltage 1kV to 35kV extruded insulated power cable and accessories" (or IEC60502) and GB/T 9330-2008 "plastic insulated control cable"; GB/t 2952-2008 "cable outer layer" and GB/T 3082-2008 " Hot-dip galvanized or hot-dip galvanized-5% aluminum-mixed rare earth alloy coated low carbon steel wirefor armoured cables


First, steel wire armored cable related standards requirements and understanding


gb/t12706-2008 "rated voltage 1kV to 35kV extruded insulated power cables and accessories" (or IEC60502) for steel wire armored power cable standards, this standard for steel wire armored requirements (according to gb/t12706.1-2008):

Material: steel wire shall be galvanized steel wire. In the AC circuit for the single core cable armored should be used non-magnetic materials, non-magnetic wire generally have stainless steel wire, aluminum alloy wire, etc. (gb/t12706.1-2008 12.2).

Wire diameter requirements: steel wire nominal diameter: 0.8 mm,1.25 mm,1.6 mm,2.0 mm,2.5 mm,3.15mm (12.4); The minimum diameter of steel wire is not small gb/t12706.1-2008 diameter t12706.1-2008 16.7.3).

Armored Requirements: steel wire armored should be tight, both adjacent to the gap between the wire is the smallest (standard gb/t12706.1-2008 12.6).

gb/t9330-2008 "Plastic insulated control cable" for steel wire armored control cable Standard, this standard refers to gb/t2952.1-2008 standard and indirect reference GB/T 3082-2008 standard, steel wire armored requirements:

Material: steel wire should be galvanized steel wire (gb/t9330.1-2008 6.6.2).

Wire diameter requirements: steel wire nominal diameter: 0.8 mm,1.25 mm,1.6 mm,2.0 mm,2.5 mm (gb/t9330.1-2008); the tolerance of wire diameter should conform to GB/T 6.6.2 (3082-2008 t9330.1-2008 6.6).

Armored Requirements: steel wire armored by the single layer of steel wire left or double-layer steel wire inner layer right, outer left to wrap on the inner liner, and the sum of the gap between the wire should not exceed the diameter of a wire (gb/t9330.1-2008 6.6.1).


Second, the quality of armored steel wire requirements


Control cable steel wire armored quality should be in line with GB/T 3082-2008 "armored cable with hot dip galvanized or hot dip galvanized-5% aluminum-mixed rare earth alloy coating low carbon steel wire"; The quality of low voltage power cable steel can be referred to GB/T 3082-2008 "armoured cable with hot dip galvanized or hot dip galvanized Aluminum-mixed rare earth alloy coating low carbon steel wire requirements, but you can not follow this standard assessment.

There are two types of coating for armored steel wire: One is galvanized layer, the other is galvanized-5% aluminum-mixed rare earth alloy coating. The daily production of steel wire used in most of the galvanized layer class.

The coating level of steel wire is divided into two groups: Ⅰ Group and Ⅱ Group. Standard, armoured steel wire should be given priority to the following nominal size of steel wire: 0.8 mm,1.25 mm,1.6 mm,2.0 mm,2.5 mm,3.15mm,4.0, mm,5.0 mm,6.0 mm. From the standard provisions, we can see: armored steel wire diameter deviation allowable range is relatively large, and the diameter of steel wire does not include non-metallic corrosion-resistant layer. According to the manufacturer's process Control level, the two sides can negotiate a decision to allow the use of steel wire larger than the specified diameter.

Tensile test, torsion test and winding test of steel wire (see table 1), the test of coating weight test (see table 2) should meet the requirements of GB/T 3082-2008. The technical requirements of the joint, the standard stressed: "Steel wire delivery coil should be composed of a wire, steel wire in the last pull out before allowing welding; "


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