4130 pressure vessel plate?

[MECHAM]

I would like to utilize 4130 HR and HT plate as a pressure containing component per API 16A (requires pv-grade), but unfortunately, "4130 plate" appears to be only as a structural grade (ASTM A829) available.
My quastioins are:
1) Is there a "4130 plate" available in PV grade?
2) If not, can it be qualified for this purpose, or do I have to use an ASTM Pressure Vessel plate grade? (The required material properties could be easily satisfied by the 4130 structural grade plate.)
3) Which other readily available plate-material could be utilized?
Required proerties are:
Sy,min = 75ksi,
Min. Elong. = 18%,
Red in Area = 35%,
HRC,max =23
NACE-conform

Thanks

 

[metengr]

MECHAM;
Here is what I would suggest, review ASME SA 20 specification, this deals with General Requirements for Steel Plates for Pressure Vessels. In this specification are listings of ASME (ASTM) specifications for all types of steel plates. Off the top of my head, the one specification that could work for you is ASME SA 517.

 

[MECHAM]

Metengr:

Thanks for the quick response. I have revieved the reference list attached to A20/20M on the ASTM web page.

(

http://www.astm.org/cgi-bin/SoftCar...ES/A20A20M.htm?L+mystore+qhkh3219+1166033405)

Besides the ASTM A517, the ASM A387 (Cr-Mo PV-Plate) could be a good candidate as well. I will order those 2 specs along with ASTM A20 and keep you posted.

Non than less, I would like to learn whether there is a way to qualify a non-PV-Plate for pressure service (I don't relate here to ASME-Code).
Since PV-Grades and non-PV-Grades of one basis material are many times distinguished only by more stringent manufacturing / processing control, would additional heat treatment with subsequent testing (mechanical (and metalurgical)) be an option?


Thanks

 

[metengr]

MECHAM;
Yes. Materials for use in pressure retaining items are evaluated by Codes and Standards bodies like API and ASME B&PV Code. Since I deal directly with ASME B&PV Code, I can provide a more comprehensive perspective regarding material.

The ASME B&PV Code consists of different sections that deal with boiler and pressure vessel design rules, recommended materials for construction and fabrication requirements to assure reasonably long life and safe operation. This is the key.

If a user or design organization feels that a material could be used in PV design, there are specific steps that must be followed before a material specification is endorsed for use. Section II of the ASME B&PV Code provides rules for how to bring forward material for consideration. Yes, there is specific mechanical testing and metallurgical evaluation that are required and corresponding data must be submitted for review and approval. In some cases, after testing is performed the behavior of materials under stress and simulated service temperature may disqualify their use completely or significantly limit their use in PV design because of poor toughness, strength and ductility degradation at elevated temperature, limited ductility during fabrication, etc.

Sorry for being long winded on this matter but I wanted you to be aware of the rigors required to have material endorsed by a Codes and Standards body. Also, more importantly, I wanted to point out to you that this is not something that you should do yourself.

 

[MECHAM]

Metengr:

Thanks for the "long winded", but very useful info.