shock resistant steel

[GIAMMA87]

Good evening,
I hope to find some users who can help me. I find myself having to solve this problem: I have a joke similar to a jammed shelf where at the end it acts a cyclic impulsive force that after some series of cycles broke. the material with which it was built this rod was steel s235jr. I can't act on any parameter as a form or decrease in impulsive force the only changeable parameter is the type of material. My question is simple: with which steel can I build this line?
what I look for is a shock-resistant steel so with high resilience (suppongo), on the net I found many theoretical articles on charpy tests but none of these indicated a list of the best shock-resistant materials. I had thought of a s355j2 or a s355k2 as they have a high resilience already at low temperatures (the working temperature of the bar is that environment) but if you want to push me to some even better material?

ps. I take advantage of it to thank all the users of this site who provide their experiences and their knowledge and give the possibility to us "projectists" to the first weapons of being able to learn so many things.

 

[meccanicamg]

Surely if you have a basic sxxx structural iron you have to pass by force of things to the steels bound by reclamation, where the mechanical characteristics rise a lot. chromium improves hardness and toughness, while nickel improves resilience and fatigue resistance; molybdenum finally reduces the phenomenon of fragility to the discovery. then a 39 hinges It would egregiove the function you requested.

 

[GIAMMA87]

Thank you for the answer,
I have looked around the characteristics of 39crnimo3 and I have seen that the kv factor rises when the tempering temperature increases (as in the figure I attach below). how can I indicate in the design that I would like a finished piece with a high kv?
I'm used to only use structural iron so I'm hard to choose and define the characteristics of a reclaim steel.

 

[meccanicamg]

you must indicate a rectification with a certain rm interval that is the traction breakage load. you can indicate that the goal is to have a kv of tot. however as you can see it is a material that is completely different from s275 and company.

 

[stevie]

Thank you for the answer,
I have looked around the characteristics of 39crnimo3 and I have seen that the kv factor rises when the tempering temperature increases (as in the figure I attach below). how can I indicate in the design that I would like a finished piece with a high kv?
I'm used to only use structural iron so I'm hard to choose and define the characteristics of a reclaim steel.View attachment 49806

you should indicate the treatment parameters, especially the tempering temperature. careful that generally the 39nicrmo3 is already in the reclaimed state. you have to ask for it. it will be your care to get him treated once worked

 

[cacciatorino]

Have you thought about making concrete steel?

 

[MassiVonWeizen]

there are also tool steelshttp://www.ciasacciai.it/prodotti/acciai-da-utensili.html (just to put a technical sheet)

 

[MassiVonWeizen]

a page with multiple types of tool steels including description of use for each http://www.balestrametalli.it/acciai-per-utensili/

 

[antonio_sc]

"qualitatively" you could also evaluate the harmonic steel (depending on the application, loads at stake and other factors)