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For sale is about 36 lbs of 4140 tool steel. These are remnants from a closing factory. Its owner told me that it is 4140. Since I got it for free, I see no reason why he would lie to me. It has a silvery appearance, not as dull as mild steel. SATISFACTION GUARANTEE: If you do not like this steel, return it via priority mail ($8.10 flat rate) and I refund your entire purchase, you would only lose return shipping.