The answer to this question perhaps has implications on some inconsistencies in the comics, but perhaps I am naïve. If the melting point is too high for these metals, how are they ever forged into weapons/shields or bonded to Wolverine's skeleton? And how are the tubes and instruments used to mold weapons and bond the metal not melting in the process? If the melting point is too low, then how are they so durable and strong? How are Wolverine and his adamantium skeleton able to endure a nuclear explosion from Nitro?

One workaround is that these metals are vibrated rather than melted, such as using Antarctic vibranium or using the technology in Shuri's vibranium mines from the Black Panther movie. But I don't think this would explain the process of binding adamantium to Wolverine's skeleton.

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    i.stack.imgur.com/XMvPi.png - From the Marvel Handbook (Vol. 2) – Valorum Apr 27 '18 at 19:37
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    According to that picture 'it' becomes workable at 1500f... for 8 minutes. And 'it' is a "mixture of certain chemical resins" - it's not an alloy; it's not even metal. It sounds more like an epoxy. Which would make sense, because plenty of epoxy's are harder than steel, and AFAIK you can't un-epoxy epoxy w/o a "molecular rearranger" either. Also, epoxies have a given set time, usually in minutes, depending on the amount of hardener added. And they produce heat themselves while they set, which is required to complete the chemical reaction. – Mazura Apr 28 '18 at 0:53

According to the Official Handbook of the Marvel Universe, vibranium melts at 5,475°F.

Scan of the text, relevant part quoted below

Weapons: Defensor wears a suit composed of vibranium; an extraterrestrial metal brought to earth by a huge meteor and found only in the African kingdom of Wakanda and the Antarctic hidden jungle called the Savage Land. Wakandan vibranium has the ability to absorb all forms of energy in the electromagnetic spectrum, making it impervious to all radiation bombardments. Further, it has an extremely high melting point (5,475° Fahrenheit), making it extremely heat resistant, and an extremely low freezing point (crystallisation temperature of -395.4° F), making its tensile strength extraordinarily high at low temperatures. Vibranium is also able to absorb about 50% of inertial Impact (owing to an unusually tight molecular crystal lattice array in the form of a compound helix), preventing penetration by any ballistic projectile up to large anti-tank weaponry.

As found by @Valorum in the comments adamantium can be worked for a short period of time if it's kept above 1,500° Fahrenheit as stated in the Official Handbook of the Marvel Universe Vol 2. However, it also states it cannot be rearranged once it has solidified again implying that it has a one time melting point of 1,500° F.

Scan of the text, relevant part quoted below

Adamantium is created through the mixing of certain chemical resins whose composition is a United States government secret. For eight minutes after the resins are mixed, the Adamantium can be molded into a particular shape as long as it is kept at a temperature of 1,500 degrees Fahrenheit. After this brief period the process of creating Adamantium is completed. The extremely stable molecular structure of the Adamantium prevents it from being molded further, even if the temperature remains high enough to keep it in liquefied form. Only a device called a Molecular Rearranger can alter the form of hardened Adamantium.

  • I've edited in the quote from the image, in the future can you try and include the text as text with the image if need be but an image of text isn't too useful. I also edited in the answer for Adamantium that was provided in the comments to the question to make this more complete. (Side note: I transcribed the text by hand for both images so I may have some typos along the way). – TheLethalCarrot Dec 19 '18 at 9:46

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