Unveiling the Composition and Heat Treatment of X12CrMoS17 Steel Grade

The chemical composition of X12CrMoS17 steel grade is as follows:

– Carbon (C): 0.09 – 0.15%
– Silicon (Si): max 0.80%
– Manganese (Mn): max 1.00%
– Phosphorus (P): max 0.040%
– Sulfur (S): 0.26 – 0.35%
– Chromium (Cr): 0.80 – 1.25%
– Molybdenum (Mo): 0.15 – 0.30%
– Nickel (Ni): max 0.30%
– Copper (Cu): max 0.30%

The heat treatment of X12CrMoS17 steel grade involves the following steps:

1. Preheat: Heat the steel slowly to a temperature of 650 – 850°C (1202 – 1562°F) and hold it at this temperature for a sufficient period of time for uniform heating.

2. Austenize: Increase the temperature to 900 – 1050°C (1652 – 1922°F) and hold the steel at this temperature for a specific duration. This allows the steel to transform into austenite.

3. Quenching: Rapidly cool the steel by immersing it in a quenching medium such as water, oil, or air. The choice of quenching medium depends on the desired hardness and mechanical properties.

4. Tempering: Reheat the quenched steel to a temperature of 150 – 260°C (302 – 500°F) and hold it at this temperature for a specific period of time. This step helps to improve the toughness and reduce brittleness.

The mechanical properties of X12CrMoS17 steel grade after heat treatment are:

– Yield strength: 390 – 430 MPa
– Tensile strength: 590 – 790 MPa
– Elongation: 15 – 20%
– Reduction in area: 40 – 50%
– Hardness: 180 – 220 HB

These properties may vary depending on the specific heat treatment conditions and the size and shape of the steel component. It is essential to follow the recommended heat treatment procedure to obtain the desired mechanical properties.
X12CrMoS17 Steel grade
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