EN19
EN19, also recognized 708M40 in BS 970 standard, is a high-quality alloy steel for general mechanical and engineering purposes. EN19 steel is characterized by its 1% chromium and molybdenum content. It is also regarded as equivalent steel grade to 42CrMo4 steel in EN standard or 4140 steel in ASTM standard. EN19 steel material is known for its excellent combination of toughness, strength, and wear resistance. It is widely used to make components for machinery, automotive parts, gears, shafts, axles, and other applications. The “EN” prefix indicates that EN19 conforms to European standards, and the number “19” specifies a particular steel grade within the EN standards.
1. EN 19 Steel Supply Ability
Otai can supply you both EN 19 steel plate and round bar.
EN19 Round Bar: diameter 8mm – 1500m
EN 19 Steel Plate: thickness 1mm – 50mm x width 200mm – 2500mm
EN19 Steels Square: 20mm – 90mm
Surface Finish: Black, Rough Machined, Turned or as per given requirements.
3. EN19 Chemical Composition
The chemical composition of EN19 steel in BS 970-1955 is
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
| BS 970-1955 | EN19 | 0.35-0.45 | 0.50-0.80 | 0.05 | 0.05 | 0.10-0.35 | 0.90-1.5 | 0.2-0.40 |
while the fourth edition in 1955 has been updated to sixth edition in 1991. The new steel grade for EN19 is 708m40 or 709M40 steel and the chemical composition is as below:
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
| BS 970-1991 | 708M40 | 0.36-0.44 | 0.7-1.0 | 0.035 | 0.035 | 0.1-0.4 | 0.9-1.2 | 0.15-0.25 |
| BS 970-1991 | 709M40 | 0.36-0.44 | 0.7-1.0 | 0.035 | 0.035 | 0.1-0.4 | 0.9-1.2 | 0.25-0.35 |
4. EN 19 Steel Material Mechanical Properties
The mechanical properties of EN 19 alloy steel are as follows:
| Properties | Metric | Imperial |
| Tensile strength | 655 MPa | 95000 psi |
| Yield strength | 415 MPa | 60200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 25.70% | 25.70% |
| Hardness, Brinell | 197 | 197 |
5. Steel EN 19 Heat Treatment and Hardening
EN19 material can be hardened by heat treatment process where it is heated at 845°C, followed by oil quenching. Before the hardening process, it can be normalized by heating at 913°C for an extended duration, followed by air cooling. The oil quenching process is initiated from a temperature of 85°C/88°C Celsius.
Tempering
EN19 alloy steel can be tempered within the range of 205 to 649°C, depending on the desired hardness level. The steel’s hardness can be enhanced by reducing the tempering temperature. For instance, a tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), while a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
Annealing
heat to 680-700°c , then cool in furnace.
Normalising
heat 870°c – 900°c and cool in still air.
Stress relieving
annealed: 600-650°c heat in needed.
hardened: 500-550°c heat in needed.
6. EN19 Alloy Steel Applications and Uses
EN19 alloy steel is highly versatile and used widely for different applications in various industries:
- Axles, drive shafts, and crankshaft connecting rods
- High tensile bolts, studs, and propeller shaft joints
- Rifle barrels and induction hardened pins
- Gears, pinions, shafts, and spindles
- Oil & Gas industries
7. Conclusion
EN 19 alloy steel stands out for its high tensile strength, versatility, and adaptability to various heat treatment processes. Its unique combination of chromium and molybdenum makes it a preferred choice for applications requiring high strength and durability. Whether it’s automotive components, machinery parts, or in the Oil & Gas industry, EN19 material has proven its mettle time and again.
Whether you have demand for EN19 round bar and steel plate, Otai can be your no second supplier. Check with us for EN19 steel price and quotation today.