无磁钻铤采用自主研发的低碳不锈钢，执行API规范及SY/T5144标准，可对螺纹进行冷滚压处理，可加工双台肩螺纹及其它规格的特殊螺纹。
无磁钻铤的尺寸规格
|
钻铤编号
|
外径D
|
内径d
|
长度L mm
|
台肩倒角
直径DF mm
|
弯曲强度比
|
|
mm
|
in
|
mm
|
in
|
|
NC23-31
|
79.4
|
3 1/8
|
31.8
|
1 1/4
|
9150
|
76.2
|
2.57：1
|
|
NC26-35
|
88.9
|
3 1/2
|
38.1
|
1 1/2
|
9150
|
82.9
|
2.42：1
|
|
NC31-41
|
104.8
|
4 1/8
|
50.8
|
2
|
9150或9450
|
100.4
|
2.43：1
|
|
NC35-47
|
120.7
|
4 3/4
|
50.8
|
2
|
9150或9450
|
114.7
|
2.58：1
|
|
NC38-50
|
127.0
|
5
|
57.2
|
2 1/4
|
9150或9450
|
121．0
|
2.38：1
|
|
NC44-60
|
152.4
|
6
|
57.2
|
2 1/4
|
9150或9450
|
144.5
|
2.49:1
|
|
NC44-60
|
152.4
|
6
|
71.4
|
2 13/16
|
9150或9450
|
144.5
|
2.84:1
|
|
NC44-62
|
158.8
|
6 1/4
|
57.2
|
2 1/4
|
9150或9450
|
149.2
|
2.91:1
|
|
NC46-62
|
158.8
|
6 1/4
|
71.4
|
2 13/16
|
9150或9450
|
150.0
|
2.63:1
|
|
NC46-65
|
165.1
|
6 1/2
|
57.2
|
2 1/4
|
9150或9450
|
154.8
|
2.76:1
|
|
NC46-65
|
165.1
|
6 1/2
|
71.4
|
2 13/16
|
9150或9450
|
154.8
|
3.05:1
|
|
NC46-67
|
171.4
|
6 3/4
|
57.2
|
2 1/4
|
9150或9450
|
159.5
|
3.18:1
|
|
NC50-67
|
171.4
|
6 3/4
|
71.4
|
2 13/16
|
9150或9450
|
159.5
|
2.37:1
|
|
NC50-70
|
177.8
|
7
|
57.2
|
2 1/4
|
9150或9450
|
164.7
|
2.54:1
|
|
NC50-70
|
177.8
|
7
|
71.4
|
2 13/16
|
9150或9450
|
164.7
|
2.73:1
|
|
NC50-72
|
184.2
|
7 1/4
|
71.4
|
2 13/16
|
9150或9450
|
169.5
|
3.12:1
|
|
NC56-77
|
196.8
|
7 3/4
|
71.4
|
2 13/16
|
9150或9450
|
185.3
|
2.70:1
|
|
NC56-80
|
203.2
|
8
|
71.4
|
2 13/16
|
9150或9450
|
190.1
|
3.02:1
|
|
6 5/8REG
|
209.6
|
8 1/4
|
71.4
|
2 13/16
|
9150或9450
|
195.7
|
2.93:1
|
|
NC61-90
|
228.6
|
9
|
71.4
|
2 13/16
|
9150或9450
|
212.7
|
3.17:1
|
|
7 5/8REG
|
241.3
|
9 1/2
|
76.2
|
3
|
9150或9450
|
223.8
|
2.81:1
|
|
NC70-97
|
247.6
|
9 3/4
|
76.2
|
3
|
9150或9450
|
232.6
|
2.57:1
|
|
NC70-100
|
254.0
|
10
|
76.2
|
3
|
9150或9450
|
237.3
|
281:1
|
|
8 5/8REG
|
279.4
|
11
|
76.2
|
3
|
9150或9450
|
266.7
|
2.84:1
|
无磁钻铤的主要公差尺寸
|
外径范围
|
外径D
|
内径d
|
长度L
|
台肩倒角直径DF
|
|
|
mm
|
in
|
|
≤88.9
|
≤3 1/2
|
+1.2
0
|
+1.6
0
|
＋152.4
|
±0.4
|
|
＞88.9~114.3
|
＞3 1/2~4 1/2
|
+1.6
0
|
|
＞114.3~139.7
|
＞4 1/2~5 1/2
|
+2.0
0
|
|
＞139.7~165.1
|
＞5 1/2~6 1/2
|
+3.2
0
|
|
＞165.1~215.9
|
＞6 1/2~8 1/2
|
+4.0
0
|
|
＞215.9~241.3
|
＞8 1/2~9 1/2
|
+4.8
0
|
|
＞241.3
|
＞9 1/2
|
+6.4
0
|
无磁钻铤的力学性能
|
外径范围
|
屈服强度
σ0.2
MPa
|
抗拉强度
σb
MPa
|
伸长率
δ4
%
|
|
|
mm
|
in
|
|
79.4~171.4
|
3 1/8~6 3/4
|
≥758
|
≥827
|
≥18
|
|
177.8~279.4
|
7~11
|
≥689
|
≥758
|
≥20
|
|
磁性能（磁场＝1×105/4πA/m）
1. 相对磁导率Ur＜1.010
2. 磁场梯度：ΔB≤0.05μT
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