T45-R46-T45 MM Extension Drill Rod

Code No.: MF-T45-R46-T45-L700
Type: MM
Thread: T45-T45
Length: 3050mm , 3660mm ,6095mm
Shape: Round

Product details

Threaded drill rods (heavy-duty rock drilling tools ) are slender rod systems consisting of a connecting Coupling Sleeve, Drill Rod, and Drill Bit connected by threads. Under the high frequency, high impact energy, torque, and thrust of rock drills, they withstand various combined stresses including tension, compression, torsion, and bending.

They also endure the abrasion and corrosion of working media such as rock, rock powder, and mining water in rotating and impact environments. Furthermore, the stress values fluctuate greatly depending on the drilling conditions, making drill bits, and drill rod for hydraulic drilling rigs among the most demanding and easily damaged components in service. Threaded drill rods, MF rod , Speed Rod , Extension Rod , Drifter Rod Hex type , are primarily made of hollow steel grades such as 35SiMnMoV, 20CrMnTi, and 23CrNi3Mo.

T45-RD46-T45 MM Extension Drill Rod

Drill Steel Round

It is common practice to bump up the drive end of Extension drill steel for added strength at the rock drill end to accommodate larger diameter and shank adapters. Drill steel of rock drilling tools is available in many standard lengths to match the drill feeds on a multitude of available drifting jumbos. A rock drill bit diameter closer to the steel diameter can be used since the coupling does not enter the hole, this enhances flushing and hole accuracy.

With Hexagon body from 25mm to 38mm (1”-1 1/2”) and Round body from 32mm to 51mm(1 1/4”-2”). Lengths 610mm to 6096mm(2’-20’). Avaliable with all popular international thread forms.

Hollow steel is a specialized steel with a complex manufacturing process and is an essential raw material for manufacturing drill rods. It not only has strict requirements for the steel's performance and quality indicators, but its quality also directly affects the service life of the drill rod . Strict regulations govern the product's geometric dimensions, yield strength, tensile strength, impact toughness, surface quality, decarburization, and microstructure.

Large steel mills generally do not produce drill rod steel; instead, drill rod manufacturers purchase steel from specialized steel companies and roll it into various types of hollow steel . Most drill rod processing plants in China purchase pre-processed hollow steel from drill rod manufacturers for threading, taper machining, heat treatment, and other processing.

T45 MM ROD 700MM

MM Extension Drill Rod with T45 Thread

Most are produced using two rolling processes: 1) Mechanically drilled cored strip hot rolling, using square billets as raw material, with core holes drilled and cored bars rolled. 2) Hot piercing-cored strip reduction-hot rolling (hot drawing) method. Round steel bars are used as raw material, rolled into hexagonal and round hollow steel products.

Initially, based on China's resource conditions, new production processes were developed for silicon-manganese-molybdenum alloy hollow steels 55SiMnMo, 35SiMnMoV, and 40MnMoV. Subsequently, steel grades such as 40SiMnCrMoV and 22Si2MnCrNi2Mo were designed. Recently, research has been conducted on the cleanliness, inclusions, and heat treatment of 23CrNi3Mo drill bit steel. Tapered drill rods supplied to high-end markets in Europe and America are generally manufactured using 23CrNi3Mo hollow steel.

Our country has conducted extensive research and development on steel grades for heavy-duty top hammer drilling tools, as well as rolling, heat treatment, upsetting, friction welding, threading and other processing technologies, energy transfer, and mechanical analysis of drilling tool matching. This has narrowed the gap between our country's heavy-duty top hammer drilling tools and high quality reign products, and has developed into the leading product with the most varieties, the most complete specifications, the largest quantity, and the best economic benefits among drilling tool products.

The advantages of drilling with M/M extension drill steel include: easy handling, quicker uncoupling, tighter connections and the

potential to drill straighter holes.

MF/MM Extension Drill Rods