我公司是目前国内最大的无磁钻铤生产企业，也是国内唯一一家具备材料熔炼—锻造—热处理—机械加工—成品生产线且工序完整、工艺可控的规模化生产企业，国内市场占有率达80%左右，曾荣获国家自然科学发明三等奖。我公司生产的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mminmminNC23-3179.43 1/831.81 1/4915076.22.57：1NC26-3588.93 1/238.11 1/2915082.92.42：1NC31-41104.84 1/850.829150或9450100.42.43：1NC35-47120.74 3/450.829150或9450114.72.58：1NC38-50127.0557.22 1/49150或9450121．02.38：1NC44-60152.4657.22 1/49150或9450144.52.49:1NC44-60152.4671.42 13/169150或9450144.52.84:1NC44-62158.86 1/457.22 1/49150或9450149.22.91:1NC46-62158.86 1/471.42 13/169150或9450150.02.63:1NC46-65165.16 1/257.22 1/49150或9450154.82.76:1NC46-65165.16 1/271.42 13/169150或9450154.83.05:1NC46-67171.46 3/457.22 1/49150或9450159.53.18:1NC50-67171.46 3/471.42 13/169150或9450159.52.37:1NC50-70177.8757.22 1/49150或9450164.72.54:1NC50-70177.8771.42 13/169150或9450164.72.73:1NC50-72184.27 1/471.42 13/169150或9450169.53.12:1NC56-77196.87 3/471.42 13/169150或9450185.32.70:1NC56-80203.2871.42 13/169150或9450190.13.02:16 5/8REG209.68 1/471.42 13/169150或9450195.72.93:1NC61-90228.6971.42 13/169150或9450212.73.17:17 5/8REG241.39 1/276.239150或9450223.82.81:1NC70-97247.69 3/476.239150或9450232.62.57:1NC70-100254.01076.239150或9450237.3281:18 5/8REG279.41176.239150或9450266.72.84:1        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 mmin≤88.9≤3 1/2+1.20+1.60＋152.4±0.4＞88.9~114.3＞3 1/2~4 1/2+1.60＞114.3~139.7＞4 1/2~5 1/2+2.00＞139.7~165.1＞5 1/2~6 1/2+3.20＞165.1~215.9＞6 1/2~8 1/2+4.00＞215.9~241.3＞8 1/2~9 1/2+4.80＞241.3＞9 1/2+6.40  无磁钻铤的力学性能 外径范围屈服强度σ0.2MPa抗拉强度σbMPa伸长率δ4% mmin79.4~171.43 1/8~6 3/4≥758≥827≥18177.8~279.47~11≥689≥758≥20  磁性能（磁场＝1×105/4πA/m）1.      相对磁导率Ur＜1.0102.      磁场梯度：ΔB≤0.05μT