The Composition and Heat Treatment of X12CrNiS188 Steel Grade

The Composition and Heat Treatment of X12CrNiS188 Steel Grade:

Chemical Composition:
– Carbon (C): 0.10% max
– Silicon (Si): 1.00% max
– Manganese (Mn): 1.50% max
– Phosphorus (P): 0.040% max
– Sulfur (S): 0.030% max
– Chromium (Cr): 17.00-19.00%
– Nickel (Ni): 8.00-11.00%
– Sulfur (S): 0.15-0.35%
– Nitrogen (N): 0.11% max

Heat Treatment:
X12CrNiS188 steel grade typically undergoes the following heat treatment process:
1. Annealing: Heating the steel to approximately 800-900°C for a specific period and then slow cooling in the furnace or air. This process helps to relieve internal stress and improve machinability.
2. Hardening: Heating the steel to around 980-1050°C and then rapidly quenching it in oil or water. This step increases the hardness and strength of the steel.
3. Tempering: Reheating the hardened steel to a temperature ranging from 500-700°C and then allowing it to cool in still air. Tempering reduces the brittleness and improves toughness and ductility.

Mechanical Properties:
– Tensile Strength: ≥520 MPa
– Yield Strength: ≥205 MPa
– Elongation: ≥40%
– Hardness: ≤187 HB
– Impact Toughness: ≥27J (at room temperature)
X12CrNiS188 Steel grade
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