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@kay
According to sheldon brown, it's comparable to slx tubing...
"The material [022] is virtually identical to Columbus SP/SL/SLX. The top range of tubes were seamless double-butted and the finish quality [as delivered to the builder] was much higher than Columbus. The tubing gauge of the 022 is 0.9/0.6 mm, exactly the same as Columbus SP. It's called "022" because the frame tube set weighs 2.2 kilos. The same material drawn thinner to 0.8/0.5 mm is called "019" because it weighs 1.9 kilos, just like Columbus SL. Many builders, then and now, mix gauges so a small frame might be all 019 but a 56 would have 022 chainstays and downtube for example."
http://sheldonbrown.com/japan.html