Allu quality

[keith]

 

Hi guys I've noticed there are different types of allu- specifically for frames? How do you tell what is better? Higher the number? Or does the number have nothing to do with it?

[dollar]

Most alumimium made is alloyed with other metals to give it particular properties. There are standard descriptions - some are particularly suited to frames others not. I would say that aerospace type aluminium - 2024 would be good for frames?

[TNT1]

Top ally frames are made from 7005 alloy.

[keith]

What about 7046 allu?

[dollar]

7005 makes sense. Main alloy component is zinc. 

[TNT1]

Dunno. Here's what all the various types are composed of:

Alloy	Si	Fe	Cu	Mn	Mg	Cr	Zn	V	Ti	Bi	Ga	Pb	Zr	Limits??		Al
														each	total
1060	0.25	0.35	0.05	0.03	0.03	0.03	0.05	0.05	0.03	0.03	0.03	0.03	0.03	0.03		99.6 min
1100	0.95 Si+Fe		0.05-0.20	0.05			0.10							0.05	0.15	99.0 min
2014	0.50-1.2	0.7	3.9-5.0	0.40-1.2	0.20-0.8	0.10	0.25		0.15					0.05	0.15	remainder
2024	0.50	0.50	3.8-4.9	0.30-0.9	1.2-1.8	0.10	0.25		0.15					0.05	0.15	remainder
2219	0.2	0.30	5.8-6.8	0.20-0.40	0.02		0.10	0.05-0.15	0.02-0.10				0.10-0.25	0.05	0.15	remainder
3003	0.6	0.7	0.05-0.20	1.0-1.5			0.10							0.05	0.15	remainder
3004	0.30	0.7	0.25	1.0-1.5	0.8-1.3		0.25							0.05	0.15	remainder
3102	0.40	0.7	0.10	0.05-0.40			0.30		0.10					0.05	0.15	remainder
4043	4.5-6.0	0.80	0.30	0.05	0.05		0.10		0.20					0.05	0.15	remainder
5052	0.25	0.40	0.10	0.10	2.2-2.8	0.15-0.35	0.10							0.05	0.15	remainder
5083	0.40	0.40	0.10	0.40-1.0	4.0-4.9	0.05-0.25	0.25		0.15					0.05	0.15	remainder
5086	0.40	0.50	0.10	0.20-0.7	3.5-4.5	0.05-0.25	0.25		0.15					0.05	0.15	remainder
5154	0.25	0.40	0.10	0.10	3.10-3.90	0.15-0.35	0.20		0.20					0.05	0.15	remainder
5356	0.25	0.40	0.10	0.10	4.50-5.50	0.05-0.20	0.10		0.06-0.20					0.05	0.15	remainder
5454	0.25	0.40	0.10	0.50-1.0	2.4-3.0	0.05-0.20	0.25		0.20					0.05	0.15	remainder
5456	0.25	0.40	0.10	0.50-1.0	4.7-5.5	0.05-0.20	0.25		0.20					0.05	0.15	remainder
6005	0.6-0.9	0.35	0.10	0.10	0.40-0.6	0.10	0.10		0.10					0.05	0.15	remainder
6005A?	0.50-0.9	0.35	0.30	0.50	0.40-0.7	0.30	0.20		0.10					0.05	0.15	remainder
6060	0.30-0.6	0.10-0.30	0.10	0.10	0.35-0.6	0.5	0.15		0.10					0.05	0.15	remainder
6061	0.40-0.8	0.7	0.15-0.40	0.15	0.8-1.2	0.04-0.35	0.25		0.15					0.05	0.15	remainder
6063	0.20-0.6	0.35	0.10	0.10	0.45-0.9	0.10	0.10		0.10					0.05	0.15	remainder
6066	0.9-1.8	0.50	0.7-1.2	0.6-1.1	0.8-1.4	0.40	0.25		0.20					0.05	0.15	remainder
6070	1.0-1.7	0.50	0.15-0.40	0.40-1.0	0.50-1.2	0.10	0.25		0.15					0.05	0.15	remainder
6082	0.7-1.3	0.50	0.10	0.40-1.0	0.60-1.2	0.25	0.20		0.10					0.05	0.15	remainder
6105	0.6-1.0	0.35	0.10	0.10	0.45-0.8	0.10	0.10		0.10					0.05	0.15	remainder
6162	0.40-0.8	0.50	0.20	0.10	0.7-1.1	0.10	0.25		0.10					0.05	0.15	remainder
6262	0.40-0.8	0.7	0.15-0.40	0.15	0.8-1.2	0.04-0.14	0.25		0.15	0.40-0.7		0.40-0.7		0.05	0.15	remainder
6351	0.7-1.3	0.50	0.10	0.40-0.8	0.40-0.8		0.20		0.20					0.05	0.15	remainder
6463	0.20-0.6	0.15	0.20	0.05	0.45-0.9		0.05							0.05	0.15	remainder
7005	0.35	0.40	0.10	0.20-0.7	1.0-1.8	0.06-0.20	4.0-5.0		0.01-0.06				0.08-0.20	0.05	0.15	remainder
7072	0.7 Si+Fe		0.10	0.10	0.10		0.8-1.3							0.05	0.15	remainder
7075	0.40	0.50	1.2-2.0	0.30	2.1-2.9	0.18-0.28	5.1-6.1		0.20					0.05	0.15	remainder
7116	0.15	0.30	0.50-1.1	0.05	0.8-1.4		4.2-5.2	0.05	0.05		0.03			0.05	0.15	remainder
7129	0.15	0.30	0.50-0.9	0.10	1.3-2.0	0.10	4.2-5.2	0.05	0.05		0.03			0.05	0.15	remainder
7178	0.40	0.50	1.6-2.4	0.30	2.4-3.1	0.18-0.28	6.3-7.3		0.20					0.05	0.15	remainder
?Manganese plus chromium must be between 0.12-0.50%. ??This column lists the limits that apply to all elements, whether a table column exists for them or not, for which no other limits are specified.

 

[dollar]

Dont see 7046?

[TNT1]

 

Yeah, I've never heard of 7046 either...

 

Um, scratch that, they seem to mainly use it for baseball bats, so, probably not the best for a bike...

TNT12009-05-11 04:45:09

[Sacrosanct]

Sheez. Now we getting technical. So what exactly are we looking for in a good allu frame?

[nathrix]

The International Alloy Designation System is the most widely
accepted naming scheme for wrought alloys. Each alloy is given a
four-digit number, where the first digit indicates the major alloying
elements.

• 1000 series are essentially pure aluminium with a minimum 99% aluminium content by weight and can be work hardened.
• 2000 series are alloyed with copper, can be precipitation hardened to strengths comparable to steel. Formerly referred to as duralumin, they were once the most common aerospace alloys, but were susceptible to stress corrosion cracking and are increasingly replaced by 7000 series in new designs.
• 3000 series are alloyed with manganese, and can be work-hardened.
• 4000 series are alloyed with silicon. They are also known as silumin.
• 5000 series are alloyed with magnesium, derive most of their
  strength from work hardening. It is suitable for cryogenic applications
  and low temperature work. However is susceptible to corrosion above 60
  degrees C .
• 6000 series are alloyed with magnesium and silicon, are easy to
  machine, and can be precipitation-hardened, but not to the high
  strengths that 2000, and 7000 can reach.
• 7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloy.
• 8000 series is a category mainly used for lithium alloys.

More:
http://en.wikipedia.org/wiki/Aluminum_alloy



nathrix2009-05-11 04:55:19

[keith]

7046 is On One's Scandal 26 and 29er frame. The same as Daemon's project bike.

[javadude]

 

Sheez. Now we getting technical. So what exactly are we looking for in a good allu frame?

 

The one that comes with the best warranty?

 

[GIRR]

I see most alu frames are the 6061 and 7005 series I think, but now what about scandium frames?  I don't see a number series there that includes scandium?  I am pretty sure scandium bars and frames etc. are not pure scandium.

[keith]

GIRR I'm with you on that question!

[dollar]

It looks like scandium is a pretty exotic stuff. Very small percentages are alloyed with aluminium to give it better properties.

 

Good aluminium frame? Strength, resistance to fatigue and weldability?

 

[TNT1]

 

I see most alu frames are the 6061 and 7005 series I think' date=' but now what about scandium frames?  I don't see a number series there that includes scandium?  I am pretty sure scandium bars and frames etc. are not pure scandium.

[/quote']

 

True, they are another aluminium alloy, with a scandium content, but for marketing purposes, they sell them under a Scandium alloy label. Usually they have very little scandium in them...