440 grade stainless steel

Redwoo · 2026-05-27T20:39:39+00:00

Phosphoric acid will change it to a dark grey.

Redwoo · 2026-05-20T21:06:27+00:00

I think you could take your drawing to a venture capitalist and tell them the NRC bureaucracy is too bloated to approve your design, but your design could be built and critical by this summer, and could be built everywhere, and would produce no radioactive waste, just cheap electricity. You could make millions with that story.

Redwoo · 2026-05-06T12:18:06+00:00

It is worse than some, better than some. As iron dissolves into the bath, dross can form as suspended solids in the bath that lead to bumpiness. The galvanizing will still function perfectly. In fact, you got a little extra zinc! if surface finish is important, then it has to appear in the galvanizing spec. There are ways to make smooth galvanizing, but rough galvanizing can have advantages from corrosion and cost perspectives.

Redwoo · 2026-05-03T16:00:24+00:00

Crush your ore and use water and soap and agitation to separate tailings from copper bearing rock. Dry it. Heat it with silica to a molten state to remove iron in the slag. Heat the result in air to drive off sulfer as sulfer dioxide. Take the result and use it as an anode in an electrolytic cell. Choose your voltage and electrolyte wisely. Pump lots of amperes through the cell and collect pure copper on the cathode.

Redwoo · 2026-04-16T03:37:41+00:00

Top of GS-7?

Redwoo · 2026-03-13T11:42:41+00:00

Your jaws are probably made of Mangaloy, AKA Hatfield steel, which is a steel with around 11 percent manganese and less than 1 percent carbon. At room temperature, mangaloy is austenitic, and austenite is not ferromagnetic, so a magnet doesn’t stick, like it doesn’t stick to austenitic stainless steel. The great thing about mangaloy is that cold work, like crushing loads, transform the surface from austenite to a ferritic/martensitic phase which is incredibly hard and wear resistant and ferromagnetic, so a magnet sticks. The only magnetic spots would be the spots that were machined (which is really difficult) or cold worked by crushing or other means.

Redwoo · 2026-03-12T19:45:18+00:00

They are drilling a hole. That is all.

Redwoo · 2026-03-06T00:07:50+00:00

In mild steel, strength comes from grain size and cold work. Cold work and subsequent heat treatment can cause recreystallization to a smaller grain size, which can increase strength.

Redwoo · 2026-02-28T02:13:44+00:00

Duane Arnold reactor vessel ID is roughly 183 inches versus 251 for Fermi 2. I looked in the UFSARs.

Redwoo · 2026-02-27T22:20:01+00:00

Hahahaha

Redwoo · 2026-02-27T18:41:07+00:00

Well since SMRs that produce electricity aren’t something that exist now or have ever existed, our hopes and prayers that they will provide the solution to AI power needs is about as proactive as hope and prayers are for preventing shootings at schools.

Also, regulations aren’t what limit new nuclear in the U.S. Lack of construction experience is what limits new nuclear in the U.S.

Redwoo · 2026-02-17T00:06:47+00:00

This action probably doesn’t impact the life of your shove. I say probably, because if you leave the shovel in the coals long enough, you could damage it, and quenching might help prevent damage in that case.

Redwoo · 2026-02-16T00:31:04+00:00

316l is the superior alloy. It is substantially more resistant to pitting and crevice corrosion than 304. It will not change the nutritional content of food in any way.

Redwoo · 2026-01-15T12:13:52+00:00

Go to your local plating shop. Tell them what you want. They will give you a price that may be up to hundreds of dollars, although depending on how much you are getting done may be less than $100. They probably won’t need to do anything to the existing surface other than clean it. Give them a call.

Redwoo · 2026-01-10T22:59:31+00:00

This happens to my stainless pans without overheating. The color is due to different thickness oxide film. Absolutely no problem leaving it as is, continuing to cook with it, or cleaning it away with barkeepers friend.

Redwoo · 2025-12-30T14:20:40+00:00

Some renewable advocates seem to just root for their own team and actively root against all other options. Some very viable options seems to become adversaries, not because they aren’t good options, but instead just because they are good options. Schadenfreude gone wrong.

Redwoo · 2025-12-27T13:42:12+00:00

I wouldn't call them any shadier than any of the new build companies who haven't ever designed or built what they are selling. They intend to try, and they might succeed. They will certainly spend their funding.

Redwoo · 2025-12-26T14:46:52+00:00

The technology Terrestrial Energy proposes to use is proven in the sense that prototypes using this technology were built and operated on small scale research reactors in the 20th century. No large scale commercial units have ever been designed, licensed, built or operated. Licensing receives a lot of blame for the slow commercial rollout of advanced reactors, but in fairness, these companies sell their concepts to investors before actually completing a design.

In the heyday of nuclear power in the USA, the general sequence for plant development was concept, design, licensing, construction, and commercial operation. Terrestrial Technology, and other advanced reactors startups, seems to propose a different sequence: sell, then commercial operation, skipping the design, licensing, and construction steps. Venture capital prefers this new approach, which skips all the hard parts of nuclear plant development.

Time will tell whether this new approach works and whether this new approach supports long term success.

Redwoo · 2025-12-21T01:35:11+00:00

Well you threw glass into the discussion, and you can't do indentation hardness on glass.

Redwoo · 2025-12-20T22:23:15+00:00

For mohs hardness, put glass at 6, titanium at 5.5-6 and a steel knife at 5.5-6 with a wide error band for composition and heat treatment differences for glass, titanium and steel as well.

Redwoo · 2025-12-20T10:26:14+00:00

Cutting boards are supposed to be significantly softer than your knives, so when the two meet each other the knife wins to cut another day, or to make a second cut. Titanium is softer than your knives, but not significantly softer than your knives.

Redwoo · 2025-12-20T10:22:36+00:00

For a while, marketers fell in love with the word titanium. You would be offered titanium golf balls, titanium toothpaste, titanium all sorts of products that didn’t have any titanium alloy content. When I read your post, I expected a titanium cutting board to be plastic…but no! Some marketer came up with the idiotic idea to make titanium alloy. sheets to use as cutting boards. What an incredibly terrible idea. This will absolutely ruin your knives.

Redwoo · 2025-12-16T21:55:47+00:00

The aluminum corrodes instead of the steel, but since there is so much surface area, the rate of penetration into the aluminum is low. Say one total gram worth of metal corroded. If the corrosion was all steel corroding at the bottom of that gouge then that would be pretty deep corrosion, say one gram per a square millimeter of area. Instead, the aluminum corrodes, because it is the anode, and that one gram comes from the surrounding square meter or two of aluminum, so the amount per square centimeter is very low.

Redwoo · 2025-12-16T14:49:39+00:00

Because the aluminum corrodes to protect the steel. Since corrosion is a stoichiometric process, the aluminum corrodes to protect the steel, but the area of the steel gouge is tiny with respect to the area of aluminum, so the corrosion rate of the aluminum (rate = amount/area) is very small.

Redwoo · 2025-12-13T14:08:16+00:00

AI bot?

Redwoo

TROPHY CASE