What is the equivalent to an HLSL step function in the material editor

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what is the equivalent to an HLSL step function in the material editor.

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The closest to that funtion would be “If” node

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You can use the hlsl step function in the material editor. Make a custom node, make two inputs named x and y. Put:

return step(x,y);

in the Code field.

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Beware though, that the UE4 documentation recommends not to use custom expressions: Custom Material Expressions in Unreal Engine | Unreal Engine 5.2 Documentation

I’d recommend to use either the if node (which at least on HLSL does not mean branching), or to subtract → sign → saturate instead.