ASTM standards for stainless steel hollow bar stock

[parsyank]

My Question is split into two parts:
1. I want to specify the astm material for Stainless Steel hollow bar stock (SS 316):
A quick search on the internet directs me to ASTM A 511 (Seamless Stainless Steel Mechanical tubing). But on going into the details i find that bar stock available as per ASTM A 511 are categorized by the OD and
wall thickness. The OD's are as per ASME 31.3(Process piping)[2",3" and so on] and thicknesses are as per different schedules (Sch 40, Sch 80, Sch 160).
Now if I search directly for hollow bar stock dimensions the sizes that i get from different manufacturers(For eg: Sandwick) are a lot different from those applicable under ASTM A 511. I cross checked across
different manufacturers and their size charts are almost same when compared to one another.
So what ASTM material should i specify if i want to use a hollow bar stock as per the manufacturer size chart? Should it be ASTM A 511 or ASTM A 276 (Standard Specification for Stainless Steel Bars and Shapes) or
any other ?

2. Whats the difference between ASTM A 312 (Standard specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes) seamless pipe and ASTM A 511 (Seamless Stainless Steel Mechanical
Tubing and Hollow Bar)? On what basis one should select the specification ?

Please correct me if i have gone wrong in mentioning the standards/specifications

Any help in this regard will be appreciated

 

[XL83NL]

1.
- What do you need? What is the issue? Thats absolutely not clear, to me at least. Lets start with that, because your post makes little sense. You say you need bar stock, but then mention tubing (and also give more hindsight to that). Later on talk about sizes and schedules which indicate piping (I consider anything greater than 1" to be piping just for ease of this topic). Your reference to B31.3 confirms this.
- Bar stock is a solid bar, without a hole. Tubing is not a bar with a hole, as the manufacturing of both is different.
- A511 is for mechanical tubing, which is different from A269/213 tubing, typically used for process plants.
- I think you meant Sandvik rather than Sandwick.

2.
- For the difference between pipe & tube, see Google.
- Tubing is used for small diameter runs, usually up to 1", in combination with compression type tube fitting (e.g. Swagelok). Pipe is used for large(r) diamaters, but usually starting at 1/2". Selection of either is usually based on line sizing and availability of any required instruments (and occasionnaly joint methods).
- For process tubing, use A213 or A269.

 

[parsyank]

Hey XL83NL,

Thanks for taking an interest in helping me.

I will simplify my question

I want to specify the appropriate ASTM material for a stainless steel hollow bar - O.D: 40mm ; I.D: 25mm (this is not a standard pipe size but is supplied by many manufacturers like Sandvik). Should i use ASTM A 312 or ASTM A 511 or ASTM A 276 ?

Looking forward to hear from you.

Regards

 

[XL83NL]

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It depends on your application, which isnt clear to me. You mention pipe (and previously B31.3), so Im thinking piping, but 'hollow bar' with such dimensions gives impression of some sort of hydraulic tubing, especially since you reference ASTM A511. However, A511 isnt in B31.3, to make it more difficult. So again, what is your application?