1.8515 Steel

Steel name: 1.8515
Diagram No.: 1100
DIN designation: 31CrMo12
Mat.No. (Wr.Nr.) designation: 1.8515
Chemical composition in weight %: 0.28-0.35% C, <0.40% Si, 0.40-0.70% Mn, <0.025% P, <0.035% S, 2.80-3.30% Cr, 0.30-0.50% Mo
Steel group: Nitriding steel
Applications: Al-free nitriding steel grade for relatively low nitriding hardnesses and relatively great nitriding depths. Suitable for gear wheels, cylinders, drills, connecting rods, shafts, extruders, guides, straightening rolls, thread gauges.
Comment: The legend: Pre-treatment: 920 C, 30 min/air. Hardening: 900 C, 30 min/oil. Heat treatment cross-section: 15 mm dia.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 870 930oC/oil/polymeer, water
Tempering: See the diagram

Diagram Tempering Temperature - Mechanical Properties

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