If both swords are the exact same hardness does it really matter what they are made out of? admittedly I have no knowledge of metals but I can't understand what the difference would be besides possibly flex.
A better question might be why a 1095 sword would have a hardness of 55.
1045 and 1060 (9260 also) in the production market are mostly (but not always) through hardened. This equates to a general hardness of around 55. Differentially hardened steel generally has an edge hardness of around 59 while T10 is advertised at around 62.
If the blade is 1095, it is rare to see it through hardened as most makers differentially harden 1095 and use lower carbon (1045, 1060) for TH.
If the 1095 is DH and has a hardness of only 55, that is pretty soft and a sign that the heat treatment was not in common specs for companies such as Dynasty Forge or Hanwei.
That aside, I don't think there would be too much difference but would really question the spec of 55 for a 1095 blade or any blade of 55 that is DH.
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sbaker, 55 in this case is only the hardness. The temper and durability ("toughness?") also factor in. I'm not exactly sure what difference the higher carbon content would make here. It probably all comes down to the heat treatment.
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Post by Rich McCaughey. (Maz) on Jul 30, 2010 7:26:12 GMT -5
Windlass advertises a handful of their swords as 1095. The amount of carbon in a steel affects how much it can be hardened, but I wonder if how hard it actually becomes is more a function of heat treating technique? Would be great if one of the smiths on the forum would chime in on this.
Post by etiennehamel on Jul 31, 2010 13:21:25 GMT -5
i don't know about the DH ones from darksword armory but almost every model of the standard line are th. the th ones have acid etched hamon and for now i only saw one dh in their site (i'll see one from the elite line in a near future and make a review for it)
if i am not mistaken, the older CAS/Hanwei euros are 1090, and said to be 55HRC. also i believe my jin-shi is likewise. i think the carbon content has alot to do with the ease of heat treat, meaning the lower, such as 1045, is easier to heat treat without critical mistakes, or flaws.
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The last two numbers signify points of carbon present in the steel. In this case 60 and 95 points respectively.
The ammount of carbon present in the steel determines how hard you can make the steel when it is quenched. 1095 will harden to a higher rockwell number than 1060.
When the steel is tempered, that is when the final hardness is determined. You can temper 1095 back to the same hardness as 1060 if you so choose.
Tempering also determines how ductile or flexible your piece will be.
Basically, if you are using 1095 and tempering it to numbers that are easily achievable with 1060, you are just wasting money. 1060 will be cheaper to buy in bar form than 1095 as it is an easier alloy to produce. There may be some advantage in edge retention due to the presence of more carbon in the matrix, but I am not positive on that
This is all in relation to simple carbon steel, and not any 5160, T-10 or other alloys.
This is just a basic view, if you want to get more in depth, I would suggest PMing either Sam Salvati or Dan Davis to get the thorough professional rundown on it. They will be able to explain any and all advantages or disadvantages to you in depth.
Post by Ronin Katana on Aug 1, 2010 12:55:36 GMT -5
Here are some hardness ranges I have experienced during destruction testing.
TH 1045 - 45-50 on the edge 1060 - 48-52 on the edge
DH 1095 - 58-62 on the edge.
The forge I use will not TH 1095, nor will they DH 1060 and below. They have made convincing arguments to me against doing this, and I trust their reasoning. Very few forges will do it.
In my opinion, most vendors are using hardness numbers provided by the forges. This does not mean they are accurate. I've worked with several forges in China, and found one of them to just outright lie about what they were producing. Everything they sent me failed testing.
My advice would be to look at what steel types the top rated companies are using and what numbers they give. There are plenty of videos out there demonstrating use and destruction, as well as reviews here on SBG.