How does Angel Sword make the toughest, high-hardness swords in the world?
It's a strong claim, and one that we back up with solid scientific data. Here's how we do it...
Start with a tough steel
We use S7 for our Bright Knight swords, which has toughness characteristics that exceed other steels commonly used for blades such as L6, O1,and 10-series steels. (Note: Our Techno-Wootz Damascus steel is superior to S7, but with patents pending no more details on steel specifics can be provided at this time. None the less, testing on the finished product has been completed and you can view the report on our Web site.) Here's a comparison of the toughness of S7 compared with other steels:
(Figures from Crucible Steel, except S7 with Therma-Cycle Treatment)
Understand the Science – Steel Hardness and Toughness
There are many ways to measure the hardness of a material. We use the Rockwell method, a standard employed by many engineers around the world. As the chart above indicates, S7 steel has a Rockwell Hardness of HRC57. This is consistent with testing performed at the Angel Sword forge after we have heat treated our swords.
The properties of any steel can be altered during the heat treat, for better or worse, depending on the skill of the smith. This includes the toughness of a steel. Toughness is measured by determining how much energy the steel will absorb. Using a tightly controlled, high quality heat treat, S7 will have a toughness – as measured by a Charpy Impact Test – of 125 ft. lbs. Angel Sword, however, employs a superior, patented heat treating process that significantly improves toughness. Using our patented Therma-Cycle technology, our S7 has a toughness of more than 250 ft. lbs.
Review the Performance
We have put treated blades through destruction testing - you can see the video on our Web site. The blades in these demos have a hardness of RC57. We have also used our swords in a world-record tameshigiri cutting demonstration, an example of the extreme performance we achieve with our swords.
The benefit of this combination of high hardness and toughness is that it allows us to refine the edge geometry of our swords. With only hardness, a sword with an aggressive edge geometry will be sharp but it will also be more prone to chipping under stress. With just the equivalent toughness, such an aggressive edge will bend on impact. Only with both high hardness and toughness can we create an edge that delivers the extreme performance of an Angel Sword.
That's how Angel Sword makes the toughest, high-hardness swords in the world!
Last updated Nov. 9, 2007 | Report Problems or Issues Using Our Site
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