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Prestressed ultrahigh-strength steel strand and manufacturing method thereof
The invention discloses a prestressed ultrahigh-strength steel strand and a manufacturing method thereof. The steel strand is of a 1 * 19-wire Seal structure, 19 wires are twisted at a time, the 12.5-time lay length is adopted, the diameter of a center wire is 6.20 m, the diameter of a middle-layer wire is 3.05 mm, the diameter of an outer-layer wire is 5.50 mm, the nominal diameter of the steel strand is 21.8 mm, the upper deviation is + 0.40 mm, and the lower deviation is-0.15 mm; the invention relates to the technical field of steel strands. According to the prestressed ultrahigh-strength steel strand and the manufacturing method thereof, the steel strand raw material wire rod subjected to high-carbon and high-alloy matching with offline salt bath heat treatment is adopted, so that the tensile strength of the wire rod is larger than or equal to 1550 MPa, the area shrinkage is larger than or equal to 35%, the sorbite rate is larger than or equal to 97%, the sorbite lamellar spacing is smaller than or equal to 70 nm, the high obdurability index is achieved, the wire breakage rate of later drawing is greatly reduced, and the tensile strength of the steel strand is improved. The performance which is not achieved by a common air-cooled wire rod is achieved, and the requirement for raw materials of the 2230 MPa ultrahigh-strength steel strand is met.
本发明公开了一种预应力超高强钢绞线及其制造方法，钢绞线采用1×19丝西鲁结构，19根丝一次性捻制，采用12.5倍捻距，中心丝的直径为6.20m，中间层丝直径为3.05mm，外层丝直径为5.50mm，钢绞线的公称直径为21.8mm，上偏差为+0.40mm，下偏差为‑0.15mm；本发明涉及钢绞线技术领域。该预应力超高强钢绞线及其制造方法，通过采用经过高碳高合金配合离线盐浴热处理的钢绞线用的原料盘条，使得盘条的抗拉强度≥1550MPa，面缩≥35％，索氏体化率≥97％且索氏体片层间距≤70nm，兼具高的强韧性指标，大大降低了后期拉拔的断丝率，这是一般风冷盘条所不具备的性能，满足了2230MPa超高强钢绞线的原料需求。
Prestressed ultrahigh-strength steel strand and manufacturing method thereof
The invention discloses a prestressed ultrahigh-strength steel strand and a manufacturing method thereof. The steel strand is of a 1 * 19-wire Seal structure, 19 wires are twisted at a time, the 12.5-time lay length is adopted, the diameter of a center wire is 6.20 m, the diameter of a middle-layer wire is 3.05 mm, the diameter of an outer-layer wire is 5.50 mm, the nominal diameter of the steel strand is 21.8 mm, the upper deviation is + 0.40 mm, and the lower deviation is-0.15 mm; the invention relates to the technical field of steel strands. According to the prestressed ultrahigh-strength steel strand and the manufacturing method thereof, the steel strand raw material wire rod subjected to high-carbon and high-alloy matching with offline salt bath heat treatment is adopted, so that the tensile strength of the wire rod is larger than or equal to 1550 MPa, the area shrinkage is larger than or equal to 35%, the sorbite rate is larger than or equal to 97%, the sorbite lamellar spacing is smaller than or equal to 70 nm, the high obdurability index is achieved, the wire breakage rate of later drawing is greatly reduced, and the tensile strength of the steel strand is improved. The performance which is not achieved by a common air-cooled wire rod is achieved, and the requirement for raw materials of the 2230 MPa ultrahigh-strength steel strand is met.
本发明公开了一种预应力超高强钢绞线及其制造方法，钢绞线采用1×19丝西鲁结构，19根丝一次性捻制，采用12.5倍捻距，中心丝的直径为6.20m，中间层丝直径为3.05mm，外层丝直径为5.50mm，钢绞线的公称直径为21.8mm，上偏差为+0.40mm，下偏差为‑0.15mm；本发明涉及钢绞线技术领域。该预应力超高强钢绞线及其制造方法，通过采用经过高碳高合金配合离线盐浴热处理的钢绞线用的原料盘条，使得盘条的抗拉强度≥1550MPa，面缩≥35％，索氏体化率≥97％且索氏体片层间距≤70nm，兼具高的强韧性指标，大大降低了后期拉拔的断丝率，这是一般风冷盘条所不具备的性能，满足了2230MPa超高强钢绞线的原料需求。
Prestressed ultrahigh-strength steel strand and manufacturing method thereof
一种预应力超高强钢绞线及其制造方法
ZHANG FENGHUA (author) / CHANG ZIXIN (author) / HAO XU (author) / ZHAO YU (author)
2024-04-26
Patent
Electronic Resource
Chinese
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