holly1
Well-Known Member
My 30m of chain and CQR are starting to leave the occasional rust mark on my deck. Does anyone know ball park figure for hot dipping said chain and anchor ?
Hot dip or not
- Thread starter holly1
- Start date
samwise
Well-Known Member
Have a word with South East Galvanisers at Witham web page I think they go by weight and some have an upper limit to their spin device.
British Metal Treatments at Great Yarmouth are also worth a look. They collect from Jacobs ( They make the cradles) at Kirton on the way to Felixstowe.
British Metal Treatments at Great Yarmouth are also worth a look. They collect from Jacobs ( They make the cradles) at Kirton on the way to Felixstowe.
Csail
N/A
Go to a trailer manufactures, they will normally chuck our bits in with their order for a few quid.
Flossdog
Well-Known Member
How do they hot dip chain without getting it all coming out in a congealed mass?
david_bagshaw
Well-Known Member
re dipping chain rarely works as the netalneeds to be realy clean first
doug748
Well-Known Member
They use a spinner to draw off the excess zinc. Few firms have this kit, the nearest I have found from the South West is Birmingham
DownWest
Well-Known Member
Just had some chain and anchors done at La Rochelle, 1.8 euro/kg inc tax. I think they give the chain a good rattle in a a cage to get rid of the excess. Friendly mob too.
Andrew
Andrew
MM5AHO
Well-Known Member
Being a galvanizer I can answer definitively.
Chain (say 10mm and larger) can be re-galvanized without a centrifuge, but the quality is not as good.
Most galvanizers have a minium order charge, and occasional customers pay a lot more than those with regular large quantities of work.
Re-galvanizing anything requires first stripping off any remaining old zinc, a process that consumes acid and therfore has a cost.
You could expect to pay about 40-60pence a kilo for stripping and re-galvanizing, but might get hit with a minimum order charge of anything from £50 to £100 regardless of quantity.
Galvanizing in most countries is paid for by the weight (weighed after galvanizing, and not the increase in weight, the whole weight), this is a simple way to charge and thats largely why its used, but the actual rate varies with the material type. Labour intensive work costs more, and low density material (like 3 dimensional lightweight structures) costs more per kg (or tonne).
The price of zinc has in the last 2 years peaked at an all time high but just now is decreasing. Galvanizers cope with this variation (it reached 4 times the price of 1 year before)by applying a surcharge which floats up and down with the zinc price. The price is falling just now, so galvanizing today is cheaper than 6 months ago, and in 6 months is likely to be cheper still. (If you can wait until late spring, do so).
The advice to lump your work in with the order of a boatyard, or a steel fabricator / blacksmith etc is good. They will have a good rate, and have orders big enough to avoid minium charges.
Those with centrifuge machines fall into 2 camps. Those that centrifuge galvanize at high temperature (circa 550C) will give you a much better finish than the others who do it at low temperature (c 450C). There are few high temp centrifuge operators left.
While its harder, it is possible to get acceptable quality from a galvanizer that doesn't have a centrifuge. As mentioned by "DownWest", the chain is "rattled about" to flick off surplus zinc before it solidifies, and also to prevent the links "welding" together.
David Bagshaw said the metal (steel) needs to be really clean first. This applies to all galvanizing. Its not possible to galvanize at all without the steel being cleaned first. Its not a coating only, its an alloying reaction between zinc and iron, and it doesn't happen if the steel has oxides, dirt etc on the surface.
But all galvanizers clean steel first. Usually with caustic soda to remove oils etc, then hydrochloric acid which dissolves the various iron oxides from the surface. Paint is the galvanizers enemy, as it doesn't come off in this chemical cleaning, and requires shotblasting first. This typically costs more than galvanizing does, effetively more than doubling the cost. But it has one advantage (shotblasting), it roughens the surface such that a thicker zinc layer forms. And as the life of the protection is directly proportional to the thickness, doubling the thickness of the zinc doubles the life. So if you want long life galvanizing, shotblast first.
If you need more specific info, PM me.
For the location of a Galvanizing Company near you, see
http://www.hdg.org.uk/
Chain (say 10mm and larger) can be re-galvanized without a centrifuge, but the quality is not as good.
Most galvanizers have a minium order charge, and occasional customers pay a lot more than those with regular large quantities of work.
Re-galvanizing anything requires first stripping off any remaining old zinc, a process that consumes acid and therfore has a cost.
You could expect to pay about 40-60pence a kilo for stripping and re-galvanizing, but might get hit with a minimum order charge of anything from £50 to £100 regardless of quantity.
Galvanizing in most countries is paid for by the weight (weighed after galvanizing, and not the increase in weight, the whole weight), this is a simple way to charge and thats largely why its used, but the actual rate varies with the material type. Labour intensive work costs more, and low density material (like 3 dimensional lightweight structures) costs more per kg (or tonne).
The price of zinc has in the last 2 years peaked at an all time high but just now is decreasing. Galvanizers cope with this variation (it reached 4 times the price of 1 year before)by applying a surcharge which floats up and down with the zinc price. The price is falling just now, so galvanizing today is cheaper than 6 months ago, and in 6 months is likely to be cheper still. (If you can wait until late spring, do so).
The advice to lump your work in with the order of a boatyard, or a steel fabricator / blacksmith etc is good. They will have a good rate, and have orders big enough to avoid minium charges.
Those with centrifuge machines fall into 2 camps. Those that centrifuge galvanize at high temperature (circa 550C) will give you a much better finish than the others who do it at low temperature (c 450C). There are few high temp centrifuge operators left.
While its harder, it is possible to get acceptable quality from a galvanizer that doesn't have a centrifuge. As mentioned by "DownWest", the chain is "rattled about" to flick off surplus zinc before it solidifies, and also to prevent the links "welding" together.
David Bagshaw said the metal (steel) needs to be really clean first. This applies to all galvanizing. Its not possible to galvanize at all without the steel being cleaned first. Its not a coating only, its an alloying reaction between zinc and iron, and it doesn't happen if the steel has oxides, dirt etc on the surface.
But all galvanizers clean steel first. Usually with caustic soda to remove oils etc, then hydrochloric acid which dissolves the various iron oxides from the surface. Paint is the galvanizers enemy, as it doesn't come off in this chemical cleaning, and requires shotblasting first. This typically costs more than galvanizing does, effetively more than doubling the cost. But it has one advantage (shotblasting), it roughens the surface such that a thicker zinc layer forms. And as the life of the protection is directly proportional to the thickness, doubling the thickness of the zinc doubles the life. So if you want long life galvanizing, shotblast first.
If you need more specific info, PM me.
For the location of a Galvanizing Company near you, see
http://www.hdg.org.uk/
metalmike
Well-Known Member
Thats well described, You ever feature in Wedgeworld?
Mike
Mike
MM5AHO
Well-Known Member
Its seems unlikely that our competitors would do that Mike,
Flossdog
Well-Known Member
Thanks for that Geoff, it all makes sense now.
Bodach na mara
Well-Known Member
Up here near Glasgow, I was told by the local galvanizers that they will not do chain. They pointed me in the direction of a company in Elgin, who have a vibration machine for chain, however I never managed to get a reply or quote from them. I then contacted a farmer who makes gates and sends them for treatment to Elgin He offered to put the chain in with his next consignment and split the cost of the process and carriage, but my share of the cost was going to be greater than the price of new chain.
holly1
Well-Known Member
wOW THANX but is cheaper to buy new chain
MM5AHO
Well-Known Member
Its a centrifuge, not a vibration machine, but it can do chain.
We also have a place in Glasgow, (Cumbernauld).
Any Central Scotland farmer sending gates to Elgin for galv must be over 5 years ago? We do southern work in Cumbernauld since 2002.
Sorry that you didn't get a response, seems strange, but PM me if you want to get that sorted.
None the less, though, imported Chinese chain is very low price (and quite good quality). Same for nuts and bolts, has meant that there's little market for centrifuge galvanizing in the UK anymore, these being the main material so processed.
We also have a place in Glasgow, (Cumbernauld).
Any Central Scotland farmer sending gates to Elgin for galv must be over 5 years ago? We do southern work in Cumbernauld since 2002.
Sorry that you didn't get a response, seems strange, but PM me if you want to get that sorted.
None the less, though, imported Chinese chain is very low price (and quite good quality). Same for nuts and bolts, has meant that there's little market for centrifuge galvanizing in the UK anymore, these being the main material so processed.
awol
Well-Known Member
[ QUOTE ]
Up here near Glasgow, I was told by the local galvanizers that they will not do chain.
[/ QUOTE ]
The place you want is Highland Colour Coaters in Cumbernauld, which is part of the Elgin mob. I've had 2 chains done by them over the years. Chain comes back with some links stuck, takes very little time with a hammer and a block of wood to free them; various stalactites (or is it stalagmites?) which encourage gloved handling for the first couple of anchorings, but smooth off quickly; and all for a minimum charge of circa £50 (2 years ago) though you could get about 200m of chain done for the same price.
Up here near Glasgow, I was told by the local galvanizers that they will not do chain.
[/ QUOTE ]
The place you want is Highland Colour Coaters in Cumbernauld, which is part of the Elgin mob. I've had 2 chains done by them over the years. Chain comes back with some links stuck, takes very little time with a hammer and a block of wood to free them; various stalactites (or is it stalagmites?) which encourage gloved handling for the first couple of anchorings, but smooth off quickly; and all for a minimum charge of circa £50 (2 years ago) though you could get about 200m of chain done for the same price.
