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Please tell me the mechanical properties of SK5

keyword
SK5
tensilestrength
mechanicalproperties
heaattreatment

Question Marumi

Can you tell me what is the tensile strength of SK5? It is heat-treated, but other details are unknown. I would appreciate it if you could tell me the difference caused by the heat treatment. Thank you.

Answer Tokai Spring

Thank you for your question!
If the spring is made of heat-treated material, the tensile strength will be approximately 1460 to 1700 N/mm^2.
In addition, when the spring is heat-treated after shaping, the tensile strength is determined by the hardness after the heat treatment. Even if there is a difference in the heat treatment method, the tensile strength is determined by the hardness after the heat treatment.

Answer Marumi

Thank you for your answer. Another question, is there no S-N diagram for fatigue stress? I tried to search but I could not find one. Can I use S-N diagrams (JIS B2709) for piano wires, etc.?

Answer Tokai Spring

Hello!
■ Is there no S-N diagram for fatigue stress? → We have reference materials, so it would be greatly appreciated if you could visit the following URL. http://ad104z30zd.smartrelease.jp/consulting/

■ Can I use the S-N diagram (JIS B2709) of piano wire, etc.? →The fatigue strength diagram of JIS B2709 is a diagram of bending stress, so it can be used as a reference to estimate the service life of SK5 disc springs.

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