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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 specification for wrought steels for mechanical and allied engineering purpose. Although there is new version of BS 970-1996 latest edition. And EN19 steel grade is similar to 709M40 grade in new version.  EN19 Alloy Forging Steel.
 
Grade Application:
EN19 Alloy steel was originally introduced for the 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
 
Hardness:
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.
 
Hardening:
En19 alloy steel can be hardened by cold working or heating and quenching.
 
Tempering:
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
MELTING POINT (°C)
1425
MELTING POINT (°F)
2600
 
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:
En19 steel is forged at 926 to 1205°C. 
 
Stress Reliving:
Annealed: 600-650°c Heat in needed.
Hardened: 500-550°c Heat in needed.
 
Normalizing:
Heat 870°C – 900°C and cool in still air.
 
Annealing:
EN19 steel is annealed at 872°C followed by slowly cooling in the furnace.
 
Density:
Density of EN19 Alloy steel material: 7.85kg/cm3
 
Machinability:
EN19 alloy steel has good machinability in the annealed condition.
 
Welding:
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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