Guide To Chromoly Steel | Materials Talk Series
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- เผยแพร่เมื่อ 15 ก.ย. 2024
- Chromoly Steel is the focus of our first "Materials Talk" video series! This type of cold roll steel is used in everything from bikes, to roll cages and rifle barrels. Chromoly is one of the most common and popular choices in steel types.
Check out our current selection of Alloy Steels here:
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Transcript:
Welcome to the Online Metals “Materials Talk” series
This video focuses on Chromoly, which is an abbreviation for chromium molybdenum steel, generally referred to as 41 series alloy steel.
Chromoly is a range of low alloy steels, commonly used in structures ranging from bicycle frames to flywheel components.
It offers the advantages of high tensile strength and malleability but cannot compete with its lightweight aluminum counterparts in terms of weight and provides less corrosion resistance than stainless steel.
In comparison to standard 1020 steel, Chromoly provides a considerably stronger and more durable product due to its higher yield strength. While it rates high in weldability, it should undergo pre and post weld thermal treatment to avoid cold cracking.
4130 is an alloy that is most commonly seen in structures for bicycle frames and is required for certain racecar roll cages. This product can also be annealed, which softens the material and offers a more malleable form.
4150 is one of the materials accepted for use in M16 rifle and M4 carbine barrels by the United States military. Due to increased carbon content, this material is less prone to fatigue and failure for burst fire.
While Chromoly typically refers to material alloys in the 41 family, 8620 and 4340 alloys share many characteristics with the 41 series alloys.
8620 Chromoly is a triple alloy carburizing steel with good toughness and ductility. It also boasts increased hardness penetration and hardenability, giving it strong core with high case hardness. This means that it will have an excellent strength and durability, but the softer core prevents it from becoming brittle. Used for gears, shafts, and crank shafts.
4340 is a nickel chromium molybdenum alloy, a steel also known for its toughness and ability to attain high strengths in the heat-treated condition. It is good for highly stressed parts.
4340 and 4130 chromoly are both normalized alloy steel but have varying strengths hardness and chemistry.
4340 is commonly referred to as aircraft grade and is used in aircraft landing gear. It is offered in air melt and vacuum melt.
Thank you for watching another Online Metals Video. Please subscribe to our channel and leave a comment below with questions or future video requests!
Thanks for the information! When will the next video be out and what will it be focused on?
No problem, Adam! We are working on aluminum alloys next so we will keep you in the loop. Hoping to get them out in February.
Highly Informative ! Much appreciated & Thanks !
My chromoly chisels are tough like S7 equivalents. Able to hold a good edge.
Is that necessary to post heat treatment of a 21.7mm outer dia 3m thick round tube of Chromoly steel 4130 after the welding procedure?, we will use in our electric motorcycle trellis frame.
I'm curious about the higher grade 4150,4340...(I'm not familiar with the naming conventions) etc alloys and their relation to 4130....tensile strength vs weight and flexibility/rigidity based on the annealing and hardening process.
I have 2 bycicles with cr-mo frame.... it's unbreakable. One is cr-mo 4130.
That is awesome! Thank you for sharing.
I am building metal detecting shovels. A competitor uses aircraft steel. What grade would you suggest. Thanks
That is a great question, where you looking into Chromoly? or are you interested in exploring aircraft steel or aluminum as well. I am no metal detecting shovel specialist, but might be able to lead you in the right direction if you know the distinct features you need.
Online Metals I need a steel that won’t rust and can be heat treated then tempered.
@@DIGOLOGIST our experts are saying that tool steels are going to be the best option (4140, 4130, or O1) we offer. That said, Manganese steel is like the Cadillac of shovel steel because of its strength and abrasion resistance, but we don't stock that currently.
Online Metals thank you I will be in touch in pricing
I've seen many arguments about which steel is better for sockets, CrMo or Cr-V. What is your opinion?
Great question! The answer is either one, once heat treated to similar hardnesses they are practically the same. They have almost identical mechanical properties once hardened. It’s like arguing over which skittle color is better. Other than the color they actually taste exactly the same.
@@onlinemetals Thank you for your reply. Tekton tools agrees with you but there have been heated arguments for years on the forums saying otherwise. Most people believe that CrMo is best, perhaps because it costs more, but I'm sure that there are different qualities of steel and different hardening methods that really determine which is best.
@@onlinemetals tools made of cr-v is more common and it's little cheaper. Professional tools is, in many cases, made from cr-mo.
I'm a sheet metal worker and I want to make a toolbox out of chromoly sheets. I can imagine chromoly sheets being way stronger than heavy mild steel junk I have lying around my house.
Yes sir! Chromoly has a significant strength advantage over mild steel in both tensile strength and yield strength.
are 4118 steel characterized as a chromoly?
Yes, that is a chromoly alloy steel!
can 520 and 4130 chromoly be sanded or polished to look chrome or no?
Hi There, 4130 and 520 can be polished but they won't be quite as bright a s a chrome finish. The steel is darker by nature.
I am looking for a chromoly tube
Head to OnlineMetals.com, we got you!
Great channel! I am a recent subscriber, and really enjoy your summary videos.
I have a suggestion. What are the best alloy candidates for the high temperature liquid floride salt reactors being considered for thorium? I’ve heard that China recently had the first functioning high temperature fluoride salt loop. I’m assuming it’s a high nickel alloy? It should be a very interesting video to research and watch. Thx. R
Thank you, Ralph. Really interesting topic. We will definitely have a deeper discussion on if this makes sense, but really appreciate the request!
A new alloy was approved and is ideal for molten salt reactors: Alloy 617 and is a combination of nickel, chromium, cobalt and molybdenum.
What is much better steel or chromoly?
That would depend on your end goal or use. What is the context?
Vocal fry
Happens to the best of us!
@@onlinemetals Indeed!
His face, it feels like he is mocking me
I can assure you, he most definitely is not. Materials are a complex subject. Hopefully, you gained something valuable from the video.
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