1.7218 (25CrMo4) Material Data Sheet

The material 1.7218 is a chrome-molybdenum alloyed tempering steel with good welding properties. Due to its chemical composition, it is suitable for tempering and due to the very good toughness has good tensile strengths, which is why it is used primarily for components in which these characteristics are very important.
 

The 1.7218 it is also known under the classification AISI 4130.

Application areas

The material 1.7218 is a very versatile material for various components, for example: in the automotive industry and aircraft construction. For parts requiring high toughness, for example: Turbine parts, axles and steering knuckles.

1. Quenched and tempered
2. Soft annealed

Heat treatment

The material 1.7218 is at 1100°C - 850°C warm unshaped and then slowly cooled.

Normalized annealing: normalizing takes place at temperatures between 860°C - 900°C. Following by cooling in the air.

Soft annealing: the soft annealing of material grade 1.7218 takes place at 680°C - 720°C with subsequent, slow cooling.

Hardening: due to its chemical composition, the 25CrMo4 is well suited for hardening. Hardening can be carried out at temperatures of 840°C - 870°C, followed by quenching in water. Furthermore, curing at 850°C - 880°C is possible, followed by quenching in oil or aqueous polymer solution.

Tempering: with a holding time of at least one hour, the tempering can take place at temperatures between 540°C - 680°C. The subsequent cooling takes place in the air.

Processing
 

Welding: 1.7218 can be welded by all common methods.

Physical Properties:

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The processing with the saw is a mechanical processing of the material, which results in a significantly lower unintended deformation and increased hardness for the existing structure, such as the thermal cutting.

Thus, the machined workpiece has a homogeneous structure even at the edge, which does not change in the continuation of the material.

This circumstance allows immediate finishing of the workpiece with milling or drilling . So it is not necessary to anneal the material or make a similar operation beforehand.