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Helppp..rust spots on HAP40
- Thread starter ltn369
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- Jul 6, 2009
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- 11,689
These are posts from BF members that I copied in order to give you more info on HAP40. (bearfacedkiller and surfingringo)
" I have used my HAP Delica on a ton of fruit and put it in my pocket all covered in fruit juice many times and while it is developing a patina it hasn't rusted at all. It has developed a patina faster than either of my M4 blades though so I would agree that it seems a little less stainless than M4. I have had it out on the ice for a day of icefishing and it was used to gut a few Mackinaws and it didn't stain at all."
"After six hours sitting in the gunnel bathing in saltwater there was a significant amount of corrosion on the exposed hap40. By the time I got to the house there was even some minor pitting that would not fully come out with flitz. Before doing this testing my feeling was that this steel was slightly less corrosion resistant than m4 and this test confirmed that for me. "
" I have used my HAP Delica on a ton of fruit and put it in my pocket all covered in fruit juice many times and while it is developing a patina it hasn't rusted at all. It has developed a patina faster than either of my M4 blades though so I would agree that it seems a little less stainless than M4. I have had it out on the ice for a day of icefishing and it was used to gut a few Mackinaws and it didn't stain at all."
"After six hours sitting in the gunnel bathing in saltwater there was a significant amount of corrosion on the exposed hap40. By the time I got to the house there was even some minor pitting that would not fully come out with flitz. Before doing this testing my feeling was that this steel was slightly less corrosion resistant than m4 and this test confirmed that for me. "
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- Apr 12, 2009
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Carbon content is pretty high in that steel, about 30% higher than 1095, for example. Aside from adding hardening potential and wear-resistance (in combining with carbide-forming elements), carbon tends to act as a catalyst for oxidation/corrosion in steel, so I'd expect it to patina pretty fast, with the steel not having enough chromium to offset it. No defect or warranty issue there, as steel of this type should pretty much be expected to oxidize, with black oxide 'patina' or red rust, or more likely both to some degree at times. So long as you don't let it get entirely out of hand by neglect, there's little reason to worry.
That aside, those spots look, at least in the pics shown, like simple patina (black oxide), and not destructive red rust. To make sure, you can rub the spots with a white pencil eraser and look for red/brown coloration coming off. If you don't see that, don't worry about the spots. And even then, if you do see some red/brown, just scrub it with some baking soda, which will dislodge most/all of the rust, and the black/grey patina will remain. Then keep it clean & dry after each use and oil it if you think you need to.
David
That aside, those spots look, at least in the pics shown, like simple patina (black oxide), and not destructive red rust. To make sure, you can rub the spots with a white pencil eraser and look for red/brown coloration coming off. If you don't see that, don't worry about the spots. And even then, if you do see some red/brown, just scrub it with some baking soda, which will dislodge most/all of the rust, and the black/grey patina will remain. Then keep it clean & dry after each use and oil it if you think you need to.
David
Last edited:
Jason B.
Knifemaker / Craftsman / Service Provider
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- Jun 13, 2007
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Return it? Warranty?
You are kidding right? You really expect someone to cover your neglect of a knife and swap it out for a new one?
Rust happens when you don't use the knife enough or leave fluids on the blade for an extended period of time. To remove rust you must use abrasive methods such as polishing compounds or fine Scotch Brite. There are chemical options but they get expensive and are best used by experienced professionals.
You are kidding right? You really expect someone to cover your neglect of a knife and swap it out for a new one?
Rust happens when you don't use the knife enough or leave fluids on the blade for an extended period of time. To remove rust you must use abrasive methods such as polishing compounds or fine Scotch Brite. There are chemical options but they get expensive and are best used by experienced professionals.
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You can try to remove them with metal polish (flitz or other). I also clean my non stainless blades with mineral oil in the evening to make sure I've gotten everything off of them. My hap40 endura is pretty beat up but has not rusted or developed much of a patina. To be fair, I cut dry stuff for the most part. Although, it is exposed to a lot of sweat on work days.
Jason B.
Knifemaker / Craftsman / Service Provider
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- Jun 13, 2007
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- 11,181
Well, you let it rust so some level of neglect is present. Thinking the factory would replace it is just absurd though. You are the one coming here asking for advice, I don't sugar coat the truth and sometimes the truth hurts.
To remove the rust follow the above methods, to prevent rust keep the blade clean and dry or coat in mineral oil.
To remove the rust follow the above methods, to prevent rust keep the blade clean and dry or coat in mineral oil.
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Ha bad luck for you, that's pretty harsh! I had a lot of light scratches on it with a few darker spots but nothing like this, and I use it a lot for cutting fresh veggies in the garden. And I mostly used to just throw it under the tap to wash it and air dry haha
I removed as much sctaches as possible with a light cloth buffing with some green compound and oil on it, and darker spots disappeard, and it was like the knife was drinking the oil.
As you can see, lot of scratches but no spots. 3 month daily use.
I removed as much sctaches as possible with a light cloth buffing with some green compound and oil on it, and darker spots disappeard, and it was like the knife was drinking the oil.
As you can see, lot of scratches but no spots. 3 month daily use.
- Joined
- Feb 21, 2009
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- 301
JB...it is your assumption that I was seeking a replacement. My warranty question was about getting it serviced and pehaps rust remove. I am more familiar w Bechmade where they sharpen the knives and do a nice job cleaning it.
As for the knife, I took the advice of using an eraser. No red stuff came off so no concern about destructive or deep rust. I then used some toothpaste with the eraser to polish the affected area. Most of the rust color came out but dark black spots remain.
My knives/fine watches are users. I don't mind character marks. Just disappointed that W the result of this first use.
Sent from my iPhone using Tapatalk
As for the knife, I took the advice of using an eraser. No red stuff came off so no concern about destructive or deep rust. I then used some toothpaste with the eraser to polish the affected area. Most of the rust color came out but dark black spots remain.
My knives/fine watches are users. I don't mind character marks. Just disappointed that W the result of this first use.
Sent from my iPhone using Tapatalk
91bravo
Gold Member
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- Jun 29, 2008
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That's not rust, that's just patina. Perfectly normal and that's to be expected of a knife steel like hap40. If you plan on using it, then expect for stains to appear. If you're looking to keep a shiny blade with low maintenance, then perhaps hap40 is not for you.....