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8Cr13MoV consists of:

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
0.80 13.00 / / 0.40 0.15 0.20 / 0.02 0.50 0.01 / 0.10

Some information from Sal posted on the Spyderco forum:

The steel in the byrds is 8Cr13MoV.

When we first began designing the byrd line and working with the makers, we asked the makers what was the best steel available in China. They said 440C. We requested 440C.

As is my anal retentive, obsessive-compulsive nature, I'm always testing. On the first run, the edge retension was quite good, lock strength was heavy duty range, lock reliability was excellent. Then I analyzed the steel in the first run. Chemistry didn't match 440C. "Something about Chinese 440C".

We communicated with the foundry. Their analysis matched ours. I said we cannot call this 440C in the USA if it is not the same chemistry as 440C in the USA. The name of the steel in China is 8Cr13MoV. .8 Carbon, 13 Chrome, less than 1. moly with vanadium.

It is a good steel and tests in a range with Aichi's AUS-8.

byrd models are made from and will be marked 8Cr13MoV.

It is interesting to note that 95% of all knives sold are sold to people that don't know one steel is different from another. Here on this forum we seem to have many that do. I'm impressed.