Grade EN19

EN19 steel, also known as AISI 4140 or 1.7225, is a high-tensile chromium–molybdenum alloy steel widely used in engineering and automotive industries. It is known for its excellent combination of strength, toughness, wear resistance, and fatigue performance, making it ideal for components subjected to high stress and heavy loads. Compared to EN8 and EN9, EN19 offers significantly improved mechanical properties and durability.

One of the key advantages of EN19 is its exceptional toughness and fatigue resistance, allowing it to perform reliably under cyclic loading, torsional stress, and shock conditions. This makes it a preferred material for critical components such as shafts, gears, and fasteners that must withstand repeated stress without failure.

Tool Steel

EN19 also exhibits excellent hardenability, enabling it to achieve a wide range of hardness levels through heat treatment. It can reach 40–50 HRC after hardening and tempering, and even higher surface hardness (above 55 HRC) through induction hardening. This flexibility allows engineers to tailor the material properties according to specific application requirements.

Due to its balanced performance and cost-effectiveness, EN19 is often selected as an alternative to higher alloy steels like EN24 when extremely high strength is not required. Its versatility makes it suitable for a wide range of industries including automotive, oil & gas, construction, and heavy machinery.

Key Properties

  • High Tensile Strength: Offers 850–1000 MPa in normalized condition and higher after heat treatment.
  • Exceptional Toughness & Fatigue Resistance: Ideal for components under cyclic loading, shock, and torsional stress.
  • Excellent Hardenability: Achieves 40–50 HRC after heat treatment and 55+ HRC surface hardness via induction hardening.
  • Good Machinability: Easily machinable in normalized and tempered conditions.
  • Good Wear Resistance: Suitable for heavy-duty mechanical applications.
  • Moderate Weldability: Requires preheating (200–300°C) and post-weld heat treatment.

Common Applications

  • High-strength shafts, gear shafts, and spline shafts
  • Studs, bolts, and high-tensile fasteners
  • Crankshafts, camshafts, and connecting rods
  • Machine tool spindles
  • Axles, driveshafts, and propeller shafts
  • Gears, pinions, and couplings
  • Rock drilling and downhole tools
  • Mandrels, rams, and press components
  • Load-bearing industrial machinery parts

PUROHIT STEEL is a trusted name in the tool steel industry, with humble beginnings dating back to 1965 and over three decades of expertise in delivering high-quality materials and solutions. Today, the group operates multiple well-established units, maintaining a vast inventory ranging from hot work and cold work tool steels to specialized materials. Known for reliability and strong technical support, PUROHIT STEEL caters to the diverse requirements of small, medium, and large-scale industries. The company specializes in manufacturing moulds and tooling components using premium grades such as Grade EN19 which is ideal for applications including injection moulds (medium to large size), blow moulds, low-pressure die-casting dies, automotive moulds, tooling plates, extrusion dies, machine parts, shafts, and general tooling components. With a focus on quality, performance, and precision, PUROHIT STEEL continues to deliver durable and efficient tooling solutions.