Piping fitting question. 1

[VeryPicky]

1. Is ASTM A519 Gr 4130 an acceptable material to fabricate the fittings in accordance with ASME B16.9? To my knowledge it is mechanical tubing and should not be used for pressure applications. Is this correct?
2. What are the requirements for that wrough material to comply with ASME B16.9?
3. Since ASTM A519 is not listed in ASME B31.3 where do I get the allowable stresses and UTS and yield values?

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[metengr]

VeryPicky;
ASME/ANSI B16.9, which is the standard for "Factory-Made Wrought Buttwelding Fittings" lists the applicable material grades;

Per section 5) of this standard, wrought fittings shall be in accordance with either A234, A403, A420, A815, B361, B363 or B366 specifications. Basically, you are limited to the material grades in these specifications. Therefore, you cannot use the A519 specification to manufacture fittings that meet the ANSI B16.9 standard.

To answer your second question, allowable stress values are by design based on some safety design margin. Since A 519 material is not recognized by ASME Section II, you will not find any ASME Boiler and Pressure Vessel Code allowable stress values for this material.

As an option, you could obtain tensile (UTS, 0.2% YS) property data for A519 Grade 4130 material directly, and decide on your own safety factor for your specific application.

 

[VeryPicky]

Thank you metengr.

You confirmed my thoughts. And since the material is not acceptable I don't have to worry about the design stress values.

I will read ASME B16.9 section 5.

Putting Human Factor Back in Engineering

 

[VeryPicky]

Is A 519 a structural tubing?
What is the application of A 519?

Seems to me that some pipe fitting manufacturers take a lot of liberty in selection of wrough material to make their fittings to ASME B16.9.

Any comments?

Putting Human Factor Back in Engineering

 

[metengr]

VeryPicky;
Yes, ASTM A 519 is a Specification for mechanical tubing, which to me could imply general usage for industrial applications.