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High tensile steels as the name suggests are structural steels, developed specially for high yield, fatigue and tensile strengths. These steels also have excellent toughness when tampered. The carbon content defines the strength of this steel type.
High tensile steels are generally used for applications such as axels, shafts, gears, bolts, and drill rods. It contains chromium-molybdenum mixture, which gives it good ductility and shock resistance. High tensile steels come in different grades such as 300M, 4140, 4145H, 4340, 4340, EN25 and EN26. 300m is a low alloy containing steel, which is vacuum melted and has high strength. 4140 is a general purpose high tensile strength steel. 4145H is wear resistant steel with the addition of chromium and molybdenum. The main uses of this steel is drilled collars, and connecting rods. EN 25 is a high tensile steel with high strength and toughness. 4340 is an alternative to EN25 and EN26. EN25 is used for applications in Hydraulic clamps, Drill Shanks, Axels, Rams, Pump shafts and more. It can be hardened by flame and induction hardening techniques. Just like EN25, EN26 is capable of withstanding high surface pressure applications.