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Grade Introduction:

EN19 steel bright round bar also known as AMERICAN SAE 4140 round bar. EN 19 Bright Round Bar is a 1% chromium – molybdenum medium hardenability general purpose high tensile steel – generally supplied hardened and tempered in the tensile range of 850 – 1000 Mpa (condition T). All our 4140 Alloy Steel Bar supplied is Ultrasound and MPI inspected. EN19 bright bar is a high quality alloy steel with tensile strength. It is a high quality medium carbon. EN19 black bar is one steel grade in BS 970-1955 standard, which is specification for wrought steels for mechanical and allied engineering purpose. With a combination of good ductility and shock resistance, EN19 bar and en 19 flat bar is suitable for applications with very high loading such as engine gear boxes. EN19 square bar is a popular material in the automotive sector it is possible to machine the material extremely accurately. EN19 hollow bar material is also in demand by Oil & Gas industry. EN19 steel bar is a prime choice because of its high strength. The EN19 rod equivalent grades are AISI 4140 Rod, DIN 1.7225/42crmo4 Bar.

EN19 steel bright round bar is an engineering alloy steel containing chromium and molybdenum. EN19 welding rod comes under the class of low alloy steel. EN19 round bars have high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. EN19 black bars can be heat treated in a number of ways to give it a combination of properties. Oil Quenched & Tempered Hardness is 28-34 HRc. EN19 bright bar Annealing delivery hardness is less than 250HB. En19 round bar has high tensile strength of 850- 1000 Mpa.

Grade Application:

  • Utilized when higher than carbon steel mechanical properties are required
  • Commonly used for axles, drive shafts, crankshaft connecting rods, high tensile bolts, studs, propeller shaft joints, rifle barrels, and induction hardened pins
  • Bolt specification: 9.8 (in condition “T”)
  • Bolt specification: 10.9 (in condition “U”)
  • Gears
  • Pinions
  • Shafts
  • Spindles
  • Oil & Gas Industries

Equivalent grades:

Internal Standard BS Din IS EN Sae/Aisi
EN19 709M40 42CrMo2 40Cr4Mo3 En19 4140

Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.

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Chemical composition:

The following table shows the chemical composition of EN19 steel:

Element C Si Mn P S Cr Mo Fe
Content (%) 0.35-0.45 0.15-0.30 0.50 – 0.80 0.035 0.040 0.90-1.50 0.20-0.40 96.78-97.77

Mechanical Properties:

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
Hardness, Knoop (converted from Brinell hardness) 219 219
Hardness, Rockwell B (converted from Brinell hardness) 92 92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13 13
Hardness, Vickers (converted from Brinell hardness) 207 207
Machinability (based on AISI 1212 as 100 machinability) 65 65


Properties Metric Imperial
Hardness, Brinell 197 197

Heat Treatment:

Steel is heated at 845°C followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C for a long period of time followed by air cooling.


Oil quench from a temperature of 85°C/88°C Celsius.


En19 alloy steel can be tempered at 205 to 649°C depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C(1000°F).

Physical Properties

DENSITY (G/CM 3) 8.08
DENSITY (LB/IN 3) 0.292

Thermal Properties

Average Coefficient of Linear Thermal Expansion (μm/m.K)
Temp. Range °C 20-100 20-200 20-400 20-600
Coefficient 12.2 12.6 13.7 14.6
Electrical Resistivity ( μΩ.m) and Thermal Conductivity (W/m.K)
Temp. Range °C 100 200 400 600
Electrical Resistivity 0.263 0.326 0.4575 0.646
Thermal Conductivity 42.6 42.2 37.7 33.0

Forging Properties:

Forge within the temperature range of 125°C/90°C Celsius.

Stress Relieving:

Annealed: 600-650°c Heat in needed.
Hardened: 500-550°c Heat in needed.


Heat 870°C – 900°C and cool in still air.


Anneal at a temperature of 85°C Celsius and cool steadily.


Density of EN19 Alloy steel material: 7.85kg/cm3


EN19 alloy steel has good machinability in the annealed condition.


EN19 steel can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat treated condition, and post weld heat treatment should be performed.

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