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Grade Introduction:

EN19 Steel is a high-quality engineering alloy steel containing chromium and molybdenum. It falls in a class of low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsion strength. It can be heat treated in a number of ways to give it a combination of properties. EN19 Steel is one steel grade in BS 970-1955 standard, which is the specification for wrought steels for mechanical and allied engineering purposes. Although there is a new version of BS 970-1996 latest edition. And EN19 steel grade is similar to the 709M40 grade in the new version. EN19 Alloy Forging Steel.

Grade Application:

EN19 Alloy steel was originally introduced for use in the machine tool and motor industries for gears, pinions, shafts, spindles, and the like. Later its applications became much more extended and it is now widely used in areas such as the oil and gas industries. EN19 is suitable for applications such as gears, bolts, studs, and a wide variety of applications where a good quality high tensile steel grade is suited.

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, OHNS, D2, D3, H-11, H-13, CW-1, 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 Properties:

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.


En19 alloy steel can be hardened by cold working or heating and quenching.


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 a lower tempering temperature. For example, a tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), and 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
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:

En19 steel is forged at 926 to 1205°C.

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.


EN19 steel is annealed at 872°C followed by slowly cooling in the furnace.


The 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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