15-5 PH | 1.4545 Material Data Sheet

The alloy steel 15-5 PH is characterized by a high yield strength and hardness, moderate corrosion resistance and high wear resistance. The 15-5 PH is one of the most important hardenable steels in its aging stages. It is analytically comparable with the materials 1.4548 or 1.4542 and was developed after the 17-4 PH for better material toughness with less dependence on the mechanical properties of the wall thickness.

On stock in condition H1100 and H1150 enables use in the low temperature range. Excellent impact strength is also given at sub-zero temperatures.

Due to the corrosion resistance and the good mechanical properties, 15-5 PH steel is suitable for use in maritime environments.

15-5 PH is susceptible to crevice corrosion in stagnant sea water, but insensitive to intergranular corrosion.
 

Application:

15-5 PH is used in plant and mechanical engineering, in the chemical industry and in the paper and wood industry. Further areas of application are in medical technology, in the petroleum industry, in shipbuilding, in the offshore area, in the air and. Space travel and in sports and Leisure industry.

If the mechanical properties and corrosion resistance of martensitic steels are insufficient, it is then  used the 15-5 PH.
 

15-5 PH is available in the conditions H1100 and H1150:

H1100: tensile strength Rm: 965-1160 N / mm²; Rp0.2 min. 795 N / mm²; A4 min. 14% longitudinal sample; Z min. 45% longitudinal sample; Kv at -30°C min. 34 joules

H1150: tensile strength Rm: min. 930 N / mm²; Rp0.2 min. 725 N / mm²; A4 min. 16% longitudinal sample; Z min. 50% longitudinal sample; Kv at -30°C min. 41 joules

Some of the special properties of the 15-5 PH are the resistance of the mechanical properties in environments in the low temperature range up to elevated temperatures of 300°C.
 

Forging: The 15-5 PH is forged in a temperature range from 1180°C to 950°C. It is cooled in the air to room temperature to ensure grain refinement.

Welding: Before welding, the condition of the base material must be taken into account to ensure optimal welding conditions. Due to the copper content in a stable form, no hot crack formation is granted. The formation of a notch can result from undercuts or welding defects, which should be avoided.

After welding, the material must be subjected to solution annealing with subsequent aging within a very short period of time in order to prevent stress cracking.

If no subsequent heat treatment is carried out, the mechanical-technological values ​​in the weld seam and in the heat affected zone can differ significantly from the base material.

Corrosion resistance: The 15-5 PH material is suitable for use in maritime environments if the mechanical properties and the corrosion resistance of the martensitic steels are not sufficient.

The combination of the very good mechanical properties and corrosion resistance characterize the material. In standing sea water, 15-5 PH is susceptible to crevice corrosion. Additional protection is necessary for this.

Machining: Machining 15-5 PH is possible in the hardened and solution-annealed condition. Machinability varies depending on the hardness depending on the condition.

Heat treatment

Solution annealing takes place between 1025°C and 1050°C with rapid cooling using water, oil or air. The quenching medium depends on the cross section of the component.

If the material is able to cool to room temperature, a complete transformation from an austenite to a martensite is possible.

Processing:

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.