Cold-Rolled Steel Strips for Armored Cables
GB/T4175.1-1984
Introduction
Cold-rolled steel strips which are used to arm electric cables are referred to as armored cables. Armored cables are a type of metal pressed cable, used to increase the mechanical strength and protective functions of an electric cable. Armored cables are characterized by a range of qualities, providing different levels of protection and resistance. GB/T4175.1-1984 specifies the requirements, test methods and evaluation criteria for cold rolled steel strips used for the armor of electric cables.
Scope of Application
GB/T4175.1-1984 applies to the production, inspection and evaluation of cold-rolled steel strips used to arm electric cables. It does not apply to steel strips which have been pre-galvanized or are made of other materials.
Technical Requirements
Steel strips for armored cables should meet the following technical requirements:
1.The type, specification and quantity of steel strips for armored cables should be indicated in the product standards.
2.The steel used for the cold rolled steel strips for the armor of an electric cable should have a mass fraction content of no more than 0.06% phosphorus and no more than 0.05% sulfur.
3.The thickness and cross-sectional area of steel strips for the armor of an electric cable should meet the requirements in Table 1.
Table 1: Cross-sectional area of steel strips for the armor of an electric cable
Type of Steel Strip Cross-sectional Area (mm2) Singlesteel strip 5-20 Double steel strip 20-30 Double steel strip with one greater strength 10-60 Three steel strips 50-90
Table 2: Dimensions of steel strips for the armor of an electric cable
Type of Steel Strip Dimensions (mm) Singlesteel strip 0.50-2.20 Double steel strip 0.50-2.50 Double steel strip with one greater strength 0.50-2.80 Three steel strips 0.50-3.20
4.The yield limit of the steel strips for the armor of an electric cable should be less than 1950N/mm2.
5.The steel strips for the armor of an electric cable should be able to withstand pressure in a radius of 1.7MPa.
6.The cold-rolled steel strips for the armor of an electric cable should have a minimum surface finish of 0.4, with no more than 1.2mm of burr and discard.
7.The width and length of the steel strips for the armor of an electric cable should meet the requirements in Table 3.
Table 3: Width and length of steel strips for the armor of an electric cable
Dimensions (mm) Width of steel strip Length of steel strip 40-40 20-6000 40-50 30-6000 50-50 30-6000 50-60 50-6000
Testing Methods and Evaluation Criteria
GB/T4175.1-1984 specifies the testing methods and evaluation criteria for the steel strips for armored cables. These include:
1.Mechanical Property Testing: Steel strips for the armor of electric cables should be tested for their mechanical properties, including the yield limit, tensile limit and elongation.
2.Metallographic Testing: Steel strips for armored cables should be tested for the metallurgical structure and grain size.
3.Surface Quality Testing: Steel strips for the armor of electric cables should be tested for their surface quality, including burr and discard size.
Conclusion
GB/T4175.1-1984 specifies the requirements, test methods and evaluation criteria for cold rolled steel strips which are used to arm electric cables. It applies to the production, inspection and evaluation of such steel strips, ensuring that they meet the necessary technical requirements.
