... high tensile strength 4. small size & big size PC Steel Wire Description:Stress-relieved, low relaxation, high tensile strength, pre- ... stressing steel wire for pre-cast pre-stressed concrete Specification:Diameter: 3. ... 3, 9.4, 10.0 mm Raw Material: High carbon steel wire rod grade SWRH77B, SWRH82B Standard: ASTM A421, ASTM A648, BS5896, ...