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| Manufacturing technology，microstructural and mechanical properties of ?5.35 mm-2 100 MPa grade hot galvalume steel wire for bridge cable |
| WANG Lin-feng1，2， ZHOU Li-chu1， CHEN Hua-qing2， HU Xian-jun3，
FANG Feng1， JIANG Jian-qing1 |
| （1. School of Materials Science and Engineering， Southeast University， Nanjing 211189， Jiangsu， China；
2. Jiangyin Walsin Steel Cable Co.， Ltd.， Jiangyin 214443， Jiangsu， China； 3. Institute of Research of
Iron and Steel（Shasteel）， Zhangjiagang 215625， Jiangsu， China） |
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Abstract In order to prepare the higher strength grade of bridge cables，the bridge cables use galvanized aluminum wire 2 100 MPa grade hot-dip galvalume steel wires with a diameter of 5.35 mm was developed through the composition design of high carbon steel rod，low damage drawing technology and optimization of hot-dip process. The main composition of designed SWRS92Si steel rod was 0.90%-0.95% C，0.8%-1.1% Si and 0.20%-0.30% Cr. Experimental results showed that the ?5.35 mm-2 100 MPa wire could be manufactured by using ?13 mm-SWRS92Si rod after lead patent. The average interlamellar spacing of pearlite in steel rod was decreased from 120 nm to 90 nm after lead patenting，and rod strength increased by about 260 MPa. After cold drawing，the interlamellar spacing of pearlite in the steel wire was decreased to about 40 nm. Spheroidizing cementite could not observed in the pearlitic wire after hot galvalume. The tensile strength and average elongation of wire were about 2 128 MPa and 5.4%，respectively. The torsion cycles of the wire were about 22，and the torsion fracture was cleavage fracture. Other properties of the wires were met the requirements of Chinese Ministry of transportation standards JT/T 1104—2016.
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Received: 20 July 2018
Published: 15 February 2019
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2019, Vol. 54 
