What’s the application? Larger choppers or an axe?
For those that don’t know:
Charpy impact toughness testing is a method used to determine the toughness of materials, specifically how much energy a material can absorb before fracturing. The test is particularly common in the evaluation of steel.
S5 @ 57HRC
Here are the approximate Charpy V-notch (CVN) impact toughness figures for S5 steel at 57 HRC:
• At Room Temperature (around 20°C or 68°F): The Charpy V-notch impact energy is typically around 40 to 60 ft-lb (54 to 81 J).
• At Lower Temperatures (e.g., -40°C or -40°F): The impact energy tends to decrease, but S5 steel at 57 HRC can still show impact toughness values around 20 to 40 ft-lb (27 to 54 J).
View attachment 2633240
K600 @ 57 HRC:
• At Room Temperature (around 20°C or 68°F): The Charpy V-notch impact energy for K600 steel at 57 HRC typically ranges from 15 to 30 ft-lb (20 to 41 J).
• At Lower Temperatures (e.g., -40°C or -40°F): The impact toughness may decrease slightly, with values typically around 10 to 20 ft-lb (14 to 27 J).
300M @ 57 HRC:
• At Room Temperature (around 20°C or 68°F): The Charpy V-notch impact energy for 300M steel at 57 HRC is typically in the range of 10 to 20 ft-lb (14 to 27 J). This represents a significant drop in toughness due to the high hardness level.
• At Lower Temperatures (e.g., -40°C or -40°F): The impact energy decreases further, possibly falling to around 5 to 10 ft-lb (7 to 14 J).
Ztuff @ 55 HRC
• At Room Temperature (around 20°C or 68°F): At 55 HRC, Z-Tuff steel is likely to have a Charpy V-notch impact energy in the range of 60 to 100 ft-lb (81 to 135 J). This higher toughness is typical for tool steels engineered to endure heavy impacts and shocks.
• At Lower Temperatures (e.g., -40°C or -40°F): Even at low temperatures, Z-Tuff steel at 55 HRC would likely retain significant toughness, with impact energy values around 40 to 70 ft-lb (54 to 95 J).
Ztuff @ 57 HRC
• At Room Temperature (around 20°C or 68°F): Z-Tuff steel at 57 HRC likely has a Charpy V-notch impact energy in the range of 50 to 80 ft-lb (68 to 108 J). Despite the higher hardness, it still maintains significant toughness, characteristic of its design.
• At Lower Temperatures (e.g., -40°C or -40°F): The impact energy may decrease somewhat, with values likely around 30 to 60 ft-lb (41 to 81 J), still providing excellent performance in colder environments.
This makes Z-Tuff steel at 57 HRC an excellent choice for applications where both edge retention and high toughness are required, such as heavy-duty knives or impact-resistant tools.
That’s all the info I could find. These are general figures but if you contact the manufacturers, they have much more specific info. Hope it helps.
