Solution annealing requirement

[Oxy_Moron]

I need to fabricate a pipe of DN 2000, wall thickness of 14.3 mm, from SS304 plate. Applicable code is ASTM A358 (please confirm). The standard says the following regarding heat treatment:

6.3.1 Unless otherwise stated in the order, all pipe shall be furnished in heat treated condition in accordance with the requirements of Table 2.

The problem here is two-fold:
1. The plates are sold by steel mills with solution annealing already - is solution annealing of finished pipe required again - if required, where will I get a furnace this large?
2. Clause 6.3.2 states

The Purchase Order shall specify one of the following conditions if the heat-treated condition specified in 6.3.1 is not desired by purchaser

But the purchaser is referring to Clause 6.3.1 and saying that heat treatment is required.

The pipe is the suction pipe from air filter to air compressor, at a pressure of 0.9 barg.

Is ASTM A312 applicable for pipe size of 2000 NB at all (I guess not, all vendors said A312 is impossible for this size?)

Relevant section of ASTM A358 is attached.

 

[weldstan]

Yes, it is unless the purchaser orders the pipe differently under 6.3.2, 6.3.3. etc.

 

[Oxy_Moron]

Yes, it is unless the purchaser orders the pipe differently under 6.3.2, 6.3.3. etc.

Can a 2000 NB pipe be solution annealed? I'm from India and nobody in the country is able to do it. If you are sure it can be done, please confirm, will look for some exporters.

 

[mfgenggear]

OP
There are heat treaters in USA
Plus it will have to be descaled
Which it require an other supplier.

 

[EdStainless]

If you are concerned about getting a correct anneal (followed by descaling and straightening) then just go to 6.3.2.2 and it should be marked HT-0.
The difference between the specs is that A358 requires the use of weld filler and it has allowances for different HT condition.
A312 must be autogenously welded and it must be annealed.
We used to anneal up to 60" regularly.

 

[Oxy_Moron]

OP
There are heat treaters in USA
Plus it will have to be descaled
Which it require an other

If you are concerned about getting a correct anneal (followed by descaling and straightening) then just go to 6.3.2.2 and it should be marked HT-0.
The difference between the specs is that A358 requires the use of weld filler and it has allowances for different HT condition.
A312 must be autogenously welded and it must be annealed.
We used to anneal up to 60" regularly.

Is that up to the seller or the buyer is they want heat treatment or not? The pipe is specified as EFW Ej =1 Pipe DN 2000, A312 TP304.

If the spec is EFW, A312 should not be possible right?

Descaling and annealing is not a problem. My company fabricates pressure vessels for which we do external firing for PWHT. But is this method applicable for pipes also?

 

[mfgenggear]

Is that up to the seller or the buyer is they want heat treatment or not? The pipe is specified as EFW Ej =1 Pipe DN 2000, A312 TP304.

If the spec is EFW, A312 should not be possible right?

Descaling and annealing is not a problem. My company fabricates pressure vessels for which we do external firing for PWHT. But is this method applicable for pipes also?

There are suppliers in the USA, that fribicate welded pipe
Will complete finished with tight diameter requirements. Will do it all.