钻 铤一、产品规格 Ф89 Ф105 Ф121 Ф146 Ф159 Ф165 Ф178 Ф203二、产品描述　使用轧制或锻造的AISI4145H铬钼合结钢制造，对化学成分及微量元素的含量进行有效的控制。根据钻铤的外形与材料分为三种形式：　 A型（圆柱式）：用普通合金钢制造，管体横截面内外皆为圆形的钻铤。　B型（螺旋式）：用普通合金钢制造，管体外表面具有螺旋槽的钻铤。　　 C型（无磁式）：用磁导率很低的不锈合金钢制造，管体横截面内外皆为圆形的钻铤。三、主要用途 钻柱的最重要组成部分之一,具有向钻头提供钻进的压力及提高钻柱刚性的作用。Drill Collar SpecificationФ89 Ф105 Ф121 Ф146 Ф159 Ф165 Ф178 Ф203It's made from rolled or forged AISI4145H chrome-molybdenum steel. The content of chemical composition and microelement is controlled effectively throughout the whole process. According to its different figures and materials, it can be divides into three types: Type A (columnar): made from ordinary alloy steel, both inside and outside of the cross section of the pipe are cycloidal.Type B (spiral): made from ordinary alloy steel, with a spiral chute on the outer surface of the pipe Type C (non-magnetic): made from stainless alloy-steel of low magnetic permeability, both inside and outside of the cross section of the pipe are rounded.