冷拉预应力钢丝技术要求

冷拉预应力钢丝技术要求：

公称直径	允许偏差	抗拉强度不小于	规定非比例伸长应力不小于O_b	最大力下总伸长率不小于 Lo=200mm	弯曲次数次数/180^。弯曲半径不小于		断面收缩率不小于	每210mm扭距的扭转次数不小于（次）	初始应力相当于70%公称抗拉强度时，1000h后应力松懈率不大于
Nominal diameter	Tolerance	Tensile strength no less than	off-proportion extrnsion stress no less than	Elongation no less than Lo=200mm	Bending Test		Reduction of area noless than	Torsion test Times/210mm torque noless than	As initial stress is 70% nominal tensile strength the stress relaxatrin after 1000h hours no more than
Nominal diameter	Tolerance	Tensile strength no less than	off-proportion extrnsion stress no less than	Elongation no less than Lo=200mm	Times/180^。 no less than	Raidus	Reduction of area noless than	Torsion test Times/210mm torque noless than
(mm)	(mm)	(Mpa)	(Mpa)	(%)		(mm)	%	n	r/%
4.00	±0.04	1470	1100	1.5	4	10	35	8	8
5.00	±0.05	1570	1180	1.5	4	15	35	8	8
6.00	±0.05	1670	1250	1.5	5	15	30	7	8
7.00	±0.05	1770	1330	1.5	5	20	30	6	8


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