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  1. #1
    x37
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    Reynolds 520 versus 4130

    Which is the better steel for a frame: Reynolds 520 or Reynolds 4130? Thanks.

  2. #2
    THE Materials Oracle Falanx's Avatar
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    Same alloy
    "While my father fought for you, I learnt. While my father glorified your petty administration, I learnt. While he longed every day for our line, Adunís line, to be restored, I learnt. He sent me away to bring the Dark Templar back when the time was right!
    "And you tell me that I cannot do this? That I cannot feel the weight of the universe?
    "Damn you, Tellan! Aldaris killed my father!"

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    x37
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    Quote Originally Posted by Falanx
    Same alloy
    Good to know. If the alloy is the same, though, what's the difference between 520 and 4130?

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    Decrepit Member Scooper's Avatar
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    520 is the proprietary designation for a range of butted frame tubes made by Reynolds using a chromium molybdenum steel alloy similar to the AISI 4130 standard.

    Other manufacturers also make butted frame tubes of AISI 4130 chromium molybdenum alloy.

    The raw material used for Reynolds 520 is essentially 4130, so the difference between 520 and 4130 is that 520 refers to the finished tube sets from Reynolds, while 4130 is simply a steel alloy that other manufacturers use to make their own tube sets competing with Reynolds 520.
    Last edited by Scooper; 12-17-06 at 10:29 PM.
    - Stan

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    Senior Member DannoXYZ's Avatar
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    Kleenex vs. tissue-paper
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  6. #6
    THE Materials Oracle Falanx's Avatar
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    Quote Originally Posted by Scooper
    520 is the proprietary designation for a range of butted frame tubes made by Reynolds using a chromium molybdenum steel alloy similar to the AISI 4130 standard.

    Other manufacturers also make butted frame tubes of AISI 4130 chromium molybdenum alloy.

    The raw material used for Reynolds 520 is essentially 4130, so the difference between 520 and 4130 is that 520 refers to the finished tube sets from Reynolds, while 4130 is simply a steel alloy that other manufacturers use to make their own tube sets competing with Reynolds 520.
    Not just similar, but actually 4130.

    Here's a quick inside tip for people wondering about exotic, custom compositions of steel. They don't exist. Unless you go to a welding filler rod manufacturer like ESAB, well, infact, only ESAB really, or have a custom 100lb heat made in a research department's electric melting facility, you won't get a 200 tonne steel mill to make you a damned thing that isn't an internationally accepted, standardised steel. They do this for various reasons:

    1.) No-one but you wants it

    2.) It's not a standardised steel, so no-one has any idea how to heat-treat it (They like to work from fifty year old Jominy tables). So no-one but you wants it

    3.) It's mechincal properties, fracture behaviour and - most important to contruction - welding behaviour are unknown so no-one but you wants it.

    See a pattern?

    Even the brand new Reynolds 953 is in fact disguised Carpenter Custom 455, which is a thirty-year old standard precipitation hardenable 455-grade stainless steel.
    "While my father fought for you, I learnt. While my father glorified your petty administration, I learnt. While he longed every day for our line, Adunís line, to be restored, I learnt. He sent me away to bring the Dark Templar back when the time was right!
    "And you tell me that I cannot do this? That I cannot feel the weight of the universe?
    "Damn you, Tellan! Aldaris killed my father!"

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    Decrepit Member Scooper's Avatar
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    Quote Originally Posted by Falanx
    Not just similar, but actually 4130.
    Thanks, Falanx. I thought so, but decided to hedge a little.
    - Stan

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    Quote Originally Posted by Falanx
    Not just similar, but actually 4130.

    Here's a quick inside tip for people wondering about exotic, custom compositions of steel. They don't exist. Unless you go to a welding filler rod manufacturer like ESAB, well, infact, only ESAB really, or have a custom 100lb heat made in a research department's electric melting facility, you won't get a 200 tonne steel mill to make you a damned thing that isn't an internationally accepted, standardised steel. They do this for various reasons:

    1.) No-one but you wants it

    2.) It's not a standardised steel, so no-one has any idea how to heat-treat it (They like to work from fifty year old Jominy tables). So no-one but you wants it

    3.) It's mechincal properties, fracture behaviour and - most important to contruction - welding behaviour are unknown so no-one but you wants it.

    See a pattern?

    Even the brand new Reynolds 953 is in fact disguised Carpenter Custom 455, which is a thirty-year old standard precipitation hardenable 455-grade stainless steel.
    what the hell?! i wish i knew stuff.

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    x37
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    Thanks for the education, Falanx.

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    <Chief Wiggum voice>That's some nice thinking, there, Falanx</Chief Wiggum voice>

    Wish I knew things like this too!!

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    Prefers Cicero cooker's Avatar
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    Quote Originally Posted by vinnydelnegro
    what the hell?! i wish i knew stuff.
    check it out.

    Quote Originally Posted by Falanx
    Studied materials engineering at Birmingham University, to BEng. Followed up with a MPhil centred on oxide defects in Ductile Iron. Specialises in ferrous metallurgy, casting technology,

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    Quote Originally Posted by x37 View Post
    Which is the better steel for a frame: Reynolds 520 or Reynolds 4130? Thanks.
    Here's an article that may help. Someone else asked the question in another thread.

    http://www.brightspoke.com/c/underst...materials.html

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    Have bike, will travel Barrettscv's Avatar
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    In terms of overall tensile strength, here is the order from strongest to weakest of common bike tubing steels.

    1. Heat-treated air hardened steel
    (Reynolds 853, Columbus Foco, TrueTemper OXPlatinum)*

    2. Heat-treated CrMo(Tange Prestige HT, TrueTemper Verus HT Reynolds 725)

    3. Cold-drawn air hardened steel
    (Reynolds 631)*

    4. Cold-drawn 4130 CrMo(Reynolds 525, TrueTemper Verus, Tange Prestige/Infinity)

    5. High tensile steel(cheap dept. store bikes, cheaper bike shop bikes)

    * Air-hardened steels actually gain strength in the weld area after welding, but not along the whole tube.
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    Decrepit Member Scooper's Avatar
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    Six year old zombie thread.
    - Stan

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    THE Materials Oracle Falanx's Avatar
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    Frames....frames....
    "While my father fought for you, I learnt. While my father glorified your petty administration, I learnt. While he longed every day for our line, Adunís line, to be restored, I learnt. He sent me away to bring the Dark Templar back when the time was right!
    "And you tell me that I cannot do this? That I cannot feel the weight of the universe?
    "Damn you, Tellan! Aldaris killed my father!"

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    Randomhead
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    closing

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