These sheets have a softened temper which is also known as annealed so they can be easily formed into shape and then heat treated for spring properties.
Blued steel sheet.
There are several different techniques and each one has its own particular uses.
The blued finish ranged from a deep gun blue to almost a gray depending on manufacturer.
I have seen alot of this type of steel as jacketing on stationary engines and turbines.
Bluing steel is the process of oxidizing the surface of the metal to protect it from rust.
Technically speaking bluing is more or less a conversion of red iron oxide fe2o3 to black iron oxide fe3o4.
It was often assembled using nickel lated steel strips and round head screws.
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The steel is also used for producing great police flashlight with awesome durability.
That type of blued sheet metal had a special finish that hasn t been equalled since.
The name of the process actually comes from the blue black appearance of the black iron oxide.
Bluing is a passivation process in which steel is partially protected against rust and is named after the blue black appearance of the resulting protective finish.
C1095 blue temper spring steel sheets 002 to 062 thickness 002 to 062 thickness x 1 2 inch to 12 3 8 widths length in inches 24 to 2100 inches rockwell c48 c51 c1095 spring steel bars and sheets blue temper.
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Before any bluing process the metal must be prepared.
The most commonly used are cold bluing and hot bluing but rust bluing was the standard for many years.