Custom Alloy Steel Round Bar Solid Round Bar EN31 EN47 With Heat Treatment

EN18 EN353 EN31 EN47 Steel Round Bar

En 353 steel has carbon content of 0.17% and the most common form of steel as it’s provides material properties that are acceptable for many automobile applications such as heavy duty gear, shaft, pinion, cam shafts, gudgeon pins [1,8]. It is neither externally brittle nor ductile due to its lower carbon content and lower hardness. As the carbon content increases, the metal becomes harder and stronger.

In order to ensure the material of the specimen is done with help of the optical emission spectroscope (OES). The result is obtain from the chemical analysis, carbon – 0.171 %, silicon – 0.3 %, manganese – 0.56 %, phosphorus – 0.012 %, sulphur – 0.13 %, Chromium – 0.953 %, Nickel – 0.989 %, molybdenum – 0.16 % and remaining percentage is iron respectively. A sample of Dia 30 × 10 mm is polished using 60 grit papers and two sparks is introduced on the surface to find the chemical composition of the material. After ensuring the chemical composition, the raw material is machined according to the dimension for various tests [3]

Chemical compostion:

C: 0.2max

Mn: 0.5-1.0

Si: 0.35max

Ni:1.0-1.5

Mo:0.08-0.15

Cr:0.75-1.25

S:0.05max

P:0.05max

Mechanical Properties

Heat treatment:

CARBURISING Pack, salt or gas carburize at 910C, holding for sufficient time to develop the required case depth and carbon content, Slow cool from carburizing temperature and re-heat to 870C, hold until temperature is uniform throughout the section, quench as required in water, oil or air cool.

Hardening quenching Tempering Brinell Rockwell Hardness

840-870 oil 150-200 62-64

Heat treatment Procedure for EN353

CARBURISING Pack, salt or gas carburize at 910C, holding for sufficient time to develop the required case depth and carbon content, Slow cool from carburizing temperature and re-heat to 870C, hold until temperature is uniform throughout the section, quench as required in water, oil or air cool.

Hardness

Vickers hardness measurement is done on the specimen as per the IS 1501-2002 procedures by using Vickers hardness tester (MH6). Hardness measurement is made with 200 g loads, dwell time of 10 seconds and diamond indenter is used for test. The impression is done on the circular faces at the centre of the specimen. The hardness values are taken corresponding to the diagonal length of the indentation. Two samples (i.e. BHT and AHT) and five readings are taken from the each sample from case to core. The average value is calculated from five readings. The hardness values of BHT (case and core) samples are, 193.7 and 201.8 HV respectively. The hardness values of AHT (case and core) samples are 684.5 and 387.8 HV respectively. It is clearly noticed that the base material (BHT) has the low hardness. The AHT specimen has high hardness when compared to the BHT sample .

Analysis

X-Ray Diffractometer is one of the most powerful techniques for material structural analysis. Bruker AXS D8 Advance X-Ray diffractometer fit with vertical goniometers, low and high temperature attachment. The angle range is 360°, the maximum usable angular is 3° to 135° and wavelength is 1.5406 Å. X-ray diffraction analysis is carried out under the following condition: Cu radiation, 40 KV voltage, 35 mA current and maximum angular speed 30°/s. When the x-ray is passed into the substrate and it is reflected back to the detector the angle made by the reflected ray to the substrate is denoted as . The value of is increased by changing the position of specimen by keeping the as reference β, D, ε, ρ are calculated. The different values are obtained by the varying value for certain range.

Tempering

Re-heat to 780C – 820C, hold until temperature is uniform throughout the section, and quench in oil, Temper immediately while still hand warm. Heat to 150C – 200C as required, Soak for 1 – 2 hours per 25mm of section, and cool in still air.

Surface Polish bars