How about this? Different variations possible (see below). Textures 
courtesy of Xplo Eristotle.

//start code
// Metal textures by Xplo Eristotle

// RUST
#declare XE_rust =
texture {
	pigment
		{
		granite
		color_map
			{
			[ 0.0 rgb <0.809995, 0.299123, 0.113405>*.8 ]
			[ 0.4 rgb <0.209995, 0.096941, 0.031510>*1.2 ]
			[ 0.6 rgb <0.209995, 0.096941, 0.031510>*1.2 ]
			[ 1.0 rgb <0.569986, 0.052720, 0.005707>*.9 ]
			}
		scale .5
		turbulence 1
		}
	normal { wrinkles }
}
	
// IRON
#declare XE_iron =
texture {
	pigment { color rgb <0.25, 0.25, 0.25> }
	normal { granite .3  scale .2 }
	finish { roughness .01 specular .5 reflection .05 diffuse .8 }
}
	
// IRON WITH RUST FLAKES (TdG)
#declare XE_iron_2 =
texture {
	pigment {
	  marble
	  pigment_map {
	    [0.00 color rgb <0.25, 0.25, 0.25>]
	    [0.20 color rgb <0.30, 0.30, 0.30>]
	    [0.45 color rgb <0.809995, 0.299123, 0.113405>*0.8]
	    [0.50 color rgb <0.25, 0.25, 0.25>]
	    [0.65 color rgb <0.23, 0.23, 0.23>]
	    [0.90 color rgb <0.24, 0.24, 0.24>]
	    [1.00 color rgb <0.25, 0.25, 0.25>]
	  }
	  scale 0.2
	  warp {turbulence 0.5}
	}
	normal {granite 0.3  scale 0.2}
	finish {
	  roughness 0.01
	  specular 0.5
	  reflection 0.05
	  diffuse 0.8
	}
}
	
// RUSTY IRON
#declare XE_rusty_iron =
texture {
	bozo
	texture_map
		{
		[ 0.0 XE_rust ]
		[ 1.0 XE_iron ]
		}
	turbulence 1
	omega .3
	lambda 4
	warp { turbulence 1 }
}
	
// STEEL
#declare XE_steel =
texture {
	pigment { color rgb <0.5, 0.5, 0.5> }
	normal { wrinkles .02 scale .1 }
	finish
		{
		roughness .001
		specular 1
		diffuse .2
		reflection .5
		}
}
	
// RUSTY STEEL
#declare XE_rusty_steel =
texture {
	bozo
	texture_map
		{
		[ 0.0 XE_rust ]
		[ 0.2 XE_rust ]
		[ 0.5 XE_iron ]
		[ 0.6 XE_steel ]
		[ 1.0 XE_steel ]
		}
	turbulence 1
	omega .6
	lambda 4
	warp { turbulence 1 }
}
//end code

Thomas

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