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| How do I recognize hot rolled steel? |
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| sparky961:
--- Quote from: PekkaNF on August 01, 2014, 06:43:54 AM ---I found a piece of "rail" very nice machined steel that is well aged and machined all over. It is pretty damn hard and nothing less than carbide cuts it. Pitty. it would be very close to right size. only to cut length and mill 10 mm out from top (L=300m) before cutting dovetails, grove and holes in it. Pekka --- End quote --- Just kinda jumping in on this one, but depending on the size of this "rail" and the availability of a large heat source you could try annealing it. I've done this with some "hard-as-diamond" parts and they machined like aluminum when I was done. Then you can heat treat as you like, or not at all. |
| PekkaNF:
About the "rail". They are machined all sides. I know that some of them were cast iron/steel something and the hardness was really funny, the machined "skin" was softer and under it it was a lot harder material. This is somewhat smaller item over metre long machined all over, some countersunk holes for bolts and stuff. I should saw off a little piece and give it a try. Maybe I should take a sample to the work and ask someone to measure hardness of it. It should tell a lot. I pickled some steel and what do you know? One piece is machined! I can see machining marks and corners are sharp too. The other piece seems genuine item. "Flakes" have fell off and it has rounded edges as VT pointed out before. Pretty evident when you think of rolling process. So here is the picture. Is it picked enough? Pekka |
| PekkaNF:
Breckfast condiments seem to work wonders! I'm genuinely surprised. One day and mill scale & rust all gone, just a little brushing with nylon brush, wash with pine oil soap, drying and light oiling. I filtered and bottled back the vinegar. Not sure how fast it is spent, but hard to believe that it would do any damage on the plastic drain or on effluent treatment plant. Some easy to separate solids were left. I like this. Some mild chemicals that you can buy from the shop, little time on the tub and done. No sparks, no noise, no obnoxious chemicals or waste to deal with. I trawled selves of two stores for Muriatic acid discuised as toilet bowl cleaner....no luck. All were perfumed detergents. Hardware store had some branded Masonry Cleaner, but a less than 1/2 litre bottle cost way over 20€! But I found some other drain opener PH13 and used it strip paint from cast iron parts. Pekka * Forgot the compulsory piccy! |
| vtsteam:
I imagine the vinegar will work well for a lot more metal than that -- so saving it is a good idea. Try it on some galvanized -- I imagine it will strip that off quickly, too. Also if you can keep it warm it will strip scale faster. |
| PekkaNF:
Went to scrapy and he cut (torch) me pretty close 1m long piece of 80*30 mm HRS. Cost about 23€. Today I found that the "rail" is ductile iron GRP700, stress relived, annealed , hardness 260-320 HB , specified. Pretty good. Problem is that it's peppered with holes leaving maximum of 160mm of usable continous length. So, this is what I need to work with. Pekka |
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