whats the dif between Grad A and Grad B in black steel pipe for HVAC applications

[Semsemmech]

whats the dif between Grad A and Grad B in black steel pipe for HVAC applications

 

[LittleInch]

No idea without more informative in material specification.

"Black steel" could be anything.

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[mk3223]

Suggest to look at the "ASTM" standard for the specific pipe material which should shown the differences in composition, mechanical properties, required treatments, etc.

 

[blacksmith37]

Likely API 5L. The 5 committee tried to eliminate grade A ( the first API pipe grade; 25,000 min yield then) in the 80's because no company represented on API 5, used it. But the pipe mills said it was still used around the world and they needed it to stay in the 5L. Any specs I have are obsolete so I have no idea what the requirements are for grade A today.

 

[1503-44]

Black steel pipe is basically what you can buy in your DIY store.

https://www.homedepot.com/p/The-Plu...n-Black-Steel-Pipe-5-Pack-1160PBL-5/308944345

It may be some flavor of ASTM A53 F grade A/B. Yet it may not.

http://www.tjxysteel.com/download/ASTM-A53.PDF

It is not API 5L.

If you have no docs showing it is A53, then it is DIY.

 

[weldstan]

We made a lot of A53 grades A amd B sold for this purpose 50 years ago.

 

[TBP]

A53F is/was pretty nasty - I thought it was going by the wayside 20 years ago. There's nothing wrong with A53B ERW (electric resistance welded) pipe for HVAC work. A106B is more than fine for any HVAC application I've ever seen. I doubt that there's many - if any - HVAC guys that have even heard of API anything.

 

[LittleInch]

The bit I love in the home depot link is when it says it meets "ASTM and ANSI technical specification", without actually mentioning which ones....

But it is made of "Durable pipe steel material" So it's all Good!

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.