(1)用途用于制造预应力钢丝及钢绞线。
(2)尺寸规格盘条的尺寸规格及允许偏差应在合同中注明,未注明者,应符合GB/T14981中B级的规定。
(3)牌号和化学成分。
预应力钢丝及钢绞线用热轧盘条的牌号和化学成分
牌 号 |
化学成分(质量分数)(%) |
C |
Si |
Mn |
P |
S |
Cu |
72A |
0.70~0.75 |
O.12~0.32 |
0.30~O.60 |
≤O.025 |
≤O.025 |
≤O.20 |
72MnA |
0.70~0.75 |
O.12~O.32 |
0.60~O.90 |
≤O.025 |
≤O.025 |
≤O.20 |
75A |
O.73~O.78 |
O.12~O.32 |
0.30~O.60 |
≤O.025 |
≤0.025 |
≤O.20 |
75MnA |
O.73~O.78 |
O.12~0.32 |
0.60~0.90 |
≤0.025 |
≤0.025 |
≤O.20 |
77A |
O.75~0.80 |
O.12~0.32 |
O.30~0.60 |
≤0.025 |
≤0.025 |
≤O.20 |
77MnA |
0.75~0.80 |
0.12~0.32 |
0.60~0.90 |
≤O.025 |
≤O.025 |
≤0.20 |
80A |
0.78~O.83 |
0.12~O.32 |
O.30~O.60 |
≤O.025 |
≤O.025 |
≤O.20 |
80MnA |
O.78~O.83 |
O.12~O.32 |
0.60~O.90 |
≤O.025 |
≤O.025 |
≤0.20 |
82A |
O.80~O.85 |
0.12~O.32 |
0.30~O.60 |
≤O.025 |
≤O.025 |
≤O.20 |
82MnA |
O.80~O.85 |
O.12~O.32 |
O.60~0.90 |
≤O.025 |
≤O.025 |
≤0.20 |
(4)力学性能。
预应力钢丝及钢绞线用热轧盘条的力学性能
牌 号 |
力学性能 |
抗拉强度ób/MPa |
断面收缩率妒ψ(%) |
抗拉强度ób/MPa |
断面收缩率ψ(%) |
直径8.0~10.0mm |
直径10.5~13.0mm |
72A |
960~1080 |
≥25% |
940~1060 |
≥25% |
72MnA
75A |
990~lllO |
970~1090 |
75MnA
77A |
1020~1140 |
1000~1120 |
77MnA
80A |
1040~1160 |
1020~1140 |
80MnA
82A |
1060~1180 |
1040~1160 |
82MnA |
1080~1200 |
1060~l180 |
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