Posted in | Steels

High Strength Engineering Steel - EN19T (709M40T)

EN19T (709M40T) is a bright drawn engineering steel from Thames Stockholders which is ideal for a range of commercial applications where high load strength and high tensile strength are a necessity. Gaining from added molybdenum, EN19T not only provides high tensile strength but also high shock and load tolerance features. Delivered in the ‘T’ condition, the steel's tensile strength performance can be as high as 1000 N/mm².


EN19T (709M40T) can be machined to fine dimensional tolerances and is thus extremely suitable in the manufacture of precision components. Machinability of the steel is usually good though the product is harder to machine than free machining engineering steels. A superior-quality appearance can also be attained by using carbide tipped tools.

EN19T (709M40T) exhibits good resistance to wear and ductility – the grade can also be nitride or flame induction hardened to maximize the wear and abrasion features of the material. This can result in a case hardness of 50 HRC or greater. EN19T is also ideal for use in extreme temperature applications while providing reasonable impact properties in low-temperature atmospheres.

Other Characteristics

EN19T (709M40T) is categorized as a low alloy chromium molybdenum through-hardening steel. In contrast to the majority of engineering steels, EN19T does provide reasonable corrosion resistance. As a result of the materials’ high tensile strength, EN19T is ideal for high-load applications such as gearboxes. Originally, EN19T was developed and launched particularly for the automotive and machine tool market. However, now it attracts a much wider customer base, spreading into new market areas such as petrochemical, oil, and gas. EN19T (709M40T) is beneficial to any commercial application where strength is a vital consideration.

EN19T (709M40T) is manufactured to much tighter sectional tolerances than general mild steel. This produces a flatter, straighter material with a much more consistent cross structure and this consistency will help to lower machining costs. EN19T is supplied in a wide variety of sizes which often nullifies the need for customers to machine the material down.


EN19T (709M40T) is an in-demand engineering steel for high strength applications and thus has a wide market base. Examples include:

  • Automotive and oil and gas sector applications
  • Axles, gearboxes, and crankshafts
  • Propeller shaft joints, rifle barrels
  • Gears, connecting rods
  • High tensile bolts, fasteners, and studs

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