Forging terminology to ASTM A694

[Kingweld]

My understanding with regard to forgings to ASTM A694 is that the material must undergo significant work, usually reduction of 4 to 1. However I find that some companies certify to ASTM A694, material such as seamless pipe (API 5L X52) that has been hot worked to form fittings such as equal tees. Is it valid to certify this as a forging to ASTM A694?

 

[Goahead]

The correct reference is probably to flanges and other accessories, not necessarily to the seamless pipes.

ASTM A 694/A 694M
STANDARD SPECIFICATION FOR CARBON AND ALLOY STEEL FORGINGS FOR PIPE FLANGES, FITTINGS, VALVES, AND PARTS FOR HIGH-PRESSURE TRANSMISSION SERVICE

http://www.welding-advisers.com/

 

[metengr]

I reviewed ASTM A 694, and ASTM A788. I don't see why this could not be done. For your case, the manufacturer is starting out with a seamless pipe product, and is hot working it to the desired shape of an equal tee. The equal tees after forming would fall under a part, not piping, per ASTM A 694.

 

[Kingweld]

Thank you for your replies but I remain in doubt as to the validity of this.Working with welding essential variables when commonly some clients in the offshore oil industry see the material grade as being necessary to re-qualify a WPS. Therefore, when hot worked seamless pipe into Tees or Con. Reds takes the A860 or MSS WPHY grade then this would trigger another WPQ if the original WPS was qualified on say flange material A694 F65. What is the difference between WPHY 65 and A694 F65?

 

[metengr]

WPHY 65, which falls under ASTM A 860 is a carbon, low alloy steel butt welded fitting specification, which lists various Grades like MPHY65. The ASTM A 694 specification is for flanges and forged fittings, which has a comparable Grade 65. For API 5L/ ASTM A 672, the comparable Grade of line pipe is X65.

What code or standard are you working under? Welding that is performed to ASME B31.4 will require a separate WPQR for material not listed. The API 5L Grades are listed, but the A 694 and A 860 material specifications are not listed. This is probably the reason why your clients need to qualify a separate WPS for these specifications.

 

[EdStainless]

The need for the WPS is driven by the alloy, as defined in the code, not the ASTM spec #. The same alloy from two different ASTM specs can be covered by the WPS.
Don't confuse spec and alloy grade with each other.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[Kingweld]

In general various codes e.g. BS4515/DNV but more often than not a change in material grade as an essential variable for welding is client spec. driven. Given what you say regarding the tee manufactured from seamless pipe is it then valid to say that the tee is dual qualified in both A694 and A860 WPHY standards?

 

[metengr]

No, you cannot make this general statement. The fabrication Code or Standard that you are working under provides the necessary requirements for material grouping and welding. If a client specification requires a separate WPQR because of a change in material grade and/or specification, so be it. The client can choose additional requirements above and beyond minimum code requirements.

Depending on application, such as impact testing, yes you can be required to qualify a weld procedure for similar grades of material under different material specifications.

 

[Kingweld]

So I guess my all encompassing question is what determines whether a Tee or Con. Red.,which has been hot formed from seamless linepipe, is certified as either A694 F65 or say A860 or MSS SP-75 WPHY 65?