From September 1, 2018, "General Technical Conditions for Steel Wire Ropes" GB/T 20118-2017 replaced "Round Strand Steel Wire Ropes" GB 1102-74. Comparing the above two steel wire rope standards, we found the following differences.
1. Different nominal tensile strengths
In GB 1102-74, the nominal tensile strength of steel wire is divided into 5 levels: 140kg/mm2, 155kg/mm2, 170kg/mm2, 185kg/mm2, 200kg/mm2; in GB/T 20118-2017, the nominal tensile strength of steel wire Divided into 3 levels: 1570N/mm2, 1770N/mm2, 1960N/mm2.
2. The term “sum of wire breaking tensile force” is no longer used.
The term "sum of breaking tension of steel wires" in GB 1102-74 is no longer used due to changes in steel wire rope standards. Instead, the term "minimum breaking tension of steel wire ropes" is used.
3. No more multiplying by the "conversion factor"
Due to changes in steel wire rope standards, "minimum breaking tension of steel wire rope" replaces "sum of breaking tension of steel wire", therefore, it is no longer multiplied by the conversion factor.
4. Series changes in wire rope diameter
In GB 1102-74, some diameters of the 6×37 steel wire rope no longer exist in GB/T 20118-2017, and steel wire ropes with other diameters have been added.
5. Different methods of marking wire ropes
Previous: Wire rope 6×37-15.0-170-light-right hand GB 1102-74
Now: 15 6×37M-FC 1770 U sZ GB/T 20118-2017
