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Colour Code
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BS970:
(1955)
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Amendment
(1970)
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Description
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Engineering Steels
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Blue
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-
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-
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General engineering bright steel
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Green
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En1A
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220M07
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Super freecutting bright steel
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Magenta
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En1A
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220M07
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Leadbearing freecutting bright steel
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Red/Blue
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En3B
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070M20
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"20" carbon bright steel
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Black/Yellow
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En5A
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080A27
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"27" carbon bright steel
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Red/Yellow
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En6
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080M30
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Medium tensile bright steel
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Red/Yellow
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En6A
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080M30
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Bright drawn carbon steel
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Yellow
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En8
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080M40
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"0" carbon bright steel, normalised
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Yellow/Green
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En8M
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212M36
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"40" carbon freecutting bright steel
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Yellow/Blue
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En9
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070M55
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"55" carbon bright steel
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Black/Green
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En14A
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150M19
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"19" carbon manganese steel
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White
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En16
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605M36
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Manganese molybdenum bright steel
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Yellow/White
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En19T
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709M40
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1% chromium molybdenum bright steel
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White/Blue
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En24
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817M40
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1.5% nickel chromium molybdenum steel
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Green/Blue
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En31
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535A99
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1% carbon chromium steel
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Red
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En32
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045M10
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Case-hardening bright steel
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Red/Brown
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En32M
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210M15
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Case-hardening freecutting bright steel
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White/Green
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En33
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-
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3% nickel case-hardening steel
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White/Green/Red
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En34
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665M17
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1.75% nickel molybdenum case-hardening steel
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White/Red
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En36
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665M13
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3.25% nickel chromium case-hardening bright steel
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Black/Red
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En40B
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722M24
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3% chromium molybdenum nitriding steel
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Red/Green
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En202
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214M15
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Case-hardening manganese semi-freecutting steel
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Yellow/Green
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En351
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635M15
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0.75% nickel chromium case-hardening steel
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Stainless Steels
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Brown
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En56AM
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416S41
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Martensitic freecutting stainless steel
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Brown/Black
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En57
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441S49
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Martensitic chromium nickel freecutting steel
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Brown/Green
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En58AM
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303S41
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Austenitic freecutting stainless steel
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Brown/Yellow
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En58B
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321S20
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Austenitic stainless steel, Ti stabilised
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Brown/Blue
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En58JM
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326S36
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Austenitic freecutting stainless steel
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Brown/Black/Red
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-
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-
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High chromium-nickel corrosion resisting steel
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Tool Steels
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Blue/Silver
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BS4659
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B01
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Oil hardening tool steel
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Green/Silver
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BS4659
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BD3
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High carbon high chromium alloy tool steel
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Silver
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BS4659
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BT1
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18% tungsten high speed steel
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The above codings are those used by ferrous metal suppliers such as McCreadys, and may not necessarily be industry standard. They should therefore only be used as a guide.
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