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Nick
Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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That's quite a complex question. We use Hardox / Bisalloy because its cheaper than the alternatives and has near to ideal properties for bots, plus there is no extra expense for heat treating. In the US, they still use S7 steel for weapons, although their builders are moving towards wear steel for the same reasons as we have.
Wear steel is designed to be both hard and tough, while other steel can be made much harder, they will also have less toughness and shock resistance. S7 is a speciality steel that can be heat treated to higher hardness than wear steel but still has reasonable toughness - in fact 'impact resistance' is its key selling feature and its used for industrial punching and cutting operations.
With wear steels, you are stuck with the pre-set hardness and toughness, while with S7 or that 65MN you can adjust the properties in the heat treating process. If the parts are treated at lower temperatures, annealed for different times and cooled at different rates, then you can have parts that are a bit softer but much tougher. That can make a huge difference as long as the heat treatment place knows what they are doing. I found that for my S7 parts, reducing the hardness From Rc 50 to Rc 45 made a huge difference between shattering and just chipping a bit.
I worry that your 65MN spring steel will be too brittle at the hardness needed to stay sharp against other steel. There should be a Chinese steel equivalent to S7; you want an impact resistant steel meant for heavy duty punching or die forming operations. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
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Tue Jul 11, 2017 9:35 pm |
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