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420J1 is an inexpensive, very corrosion resistant, durable steel with poor edge retention, primarily used in cladding of higher end steels prone to corrosion and rust.

420J1 consists of:

Composition comparison of 420J1, 420J2 and SUS 410.
Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
0.15 12.00-14.00 / 0.09 1.00 / / / 0.04 1.00 0.03 / /