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Old 12-16-06, 09:53 PM   #1
x37
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Reynolds 520 versus 4130

Which is the better steel for a frame: Reynolds 520 or Reynolds 4130? Thanks.
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Old 12-17-06, 09:22 AM   #2
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Same alloy
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Old 12-17-06, 06:54 PM   #3
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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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Old 12-17-06, 11:08 PM   #4
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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.
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Old 12-18-06, 02:43 AM   #5
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Kleenex vs. tissue-paper
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Godzilla vs. monster
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Old 12-18-06, 12:23 PM   #6
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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.
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Old 12-18-06, 05:15 PM   #7
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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.
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Old 12-18-06, 05:28 PM   #8
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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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Old 12-18-06, 06:09 PM   #9
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Thanks for the education, Falanx.
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Old 12-18-06, 07:59 PM   #10
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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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Old 12-18-06, 09:42 PM   #11
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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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Old 08-14-12, 08:42 AM   #12
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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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Old 08-14-12, 09:06 AM   #13
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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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Old 08-14-12, 11:11 AM   #14
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Six year old zombie thread.
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Old 08-14-12, 11:47 AM   #15
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Frames....frames....
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Old 08-14-12, 12:52 PM   #16
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