Galvanized Steel Wire Rope Can Be Used For Advanced Construction And Other Fields
Galvanized Steel Wire Rope monofilament, the provisions of the zinc layer weight, the number and time of copper sulfate test, and indicate the implementation of standards. Such as: GB / T8918-1996, the diameter of 0.55 ~ 0.6mm galvanized monofilament according to Table 3, and respectively GB2973-91 and GB2972-91, GB2973-91 test methods. The Japanese standard JISG3525 only provides zinc layer weight, for the diameter of 0.5 ~ 0.8mm zinc wire according to the requirements listed in Table 4, and according to JISH0401 test method.
Physical property test
(1) mechanical indicators
① total breakage force: refers to the whole rope breaking force, divided into three types: a. Theoretical calculation of breaking force (Fr): equal to the true cross-sectional area of wire rope gm and nominal strength of steel σ2 product: Fr = gmσ2; Breaking tension (Fe): Equal to the sum of the measured breaking force of all the monofilaments in the rope: Fe = Σf; c. Actual breaking force (Fw): Equal to the force when the whole rope is actually pulled off. Fr is listed in the national standard, and Fe or Fw or both are obtained at the time of inspection. This is an important indicator of mechanics. The company is located in:
② monofilament tensile strength: generally refers to the nominal strength, is to determine the actual mechanical properties of the whole rope one of the important basis. The actual strength of monofilament with the difference between the nominal strength, national standards are clearly set, with strict control. If the German standard only allows a certain range of positive, see "7. Common Criteria" (19). The company is located in:
③ monofilament twist, repeated bending, winding or knotting, are plastic and toughness indicators. The whole rope to ensure the mechanical properties have an important role, the general standards are provided. Attention should be paid to the above mechanical indexes. Test items stipulated in different national standards are different. For example, the monofilament requirements of China and Germany are as follows: strength, torsion, repeated bending (knotting); and Japanese standards stipulate: strength, twisting and entanglement. Second, the same size and strength levels of monofilament, smooth and galvanized mechanical specifications are also different, such as the Chinese standard, see "7. Often standard" (2) Listed. (2) Inspection of each mechanical index test, according to the test methods specified in each standard, see "7. Common Criteria" listed. Tables 5 and 6, respectively, for the Chinese and German standards ("7. Common Criteria" (2) (19)] part of the diameter range of single-twisted, repeated bending provisions.
It can be used in the field of advanced construction, ship bundling, towing, strapping and other fields for shipping, offshore oil exploration, aircraft handling and marine fishing, trawling, setting nets and roll nets. Galvanized steel wire rope cord used to be made of sisal and jute, but these materials easily absorb acid, alkali, sea water and other corrosive substances at work, resulting in early corrosion of the inner wire broken wire, polypropylene has been used as a rope core.
The twisting of galvanized steel wire rope and ordinary round wire rope the same, but according to the working conditions of the wire rope, raw steel wire zinc layer thickness has different requirements: Diameter 0.2 ~ 5.0mm special No. I galvanized steel wire rope, plating Thickness can be divided into three groups: thin coating layer of zinc on the amount of 15 ~ 135g / m2, for mild corrosion conditions; in the coating group on the amount of zinc 60 ~ 200g / m2, for medium corrosion conditions; thick galvanized group The amount of zinc 75 ~ 260g / m2, for severe corrosion conditions. To ensure the quality of the wire rope, the galvanized steel wire surface should be smooth, complete, uniform and strong. Zinc layers should not peel or crack when the galvanized wire is helically wound on a mandrel of 5 or 10 times the diameter of the wire. Corrosion resistance of galvanized coating, should also be the appropriate test.