MIL-DTL-12560 - UNS or ASTM?

By pipewelder_1999 (****)

Date 12-13-2015 13:19 Edited 12-13-2015 13:21

If you notice in the references section of the specification there are no references to ASTM specs for materials nor references to UNS numbers. Anyone manufacturing this material would probably advertise it as such.

Mechanical properties seem similar to AR400 . Wear materials even in the civilian sector used to be difficult to match to a specification.

Are you looking for a source?

By Tyrone

Date 12-14-2015 11:51

Pipewelder is correct. No references.
Steel suppliers make MIL-DTL or their own products that conform to the mil specs.

Google Armox or Arcelor Mars for 46100 equivalents.

A514 is close to 12560

Tyrone

By ssbn727 (*****)

Date 12-14-2015 17:12

Why not use E11018 electrodes? And if you need to undermatch, you can go down to E80, or 9018 but I don't know about using E7018 to weld AR400... This may also require pre-heat and interpass temperatures depending on the thickness of the metal.

Respectfully,
Henry

By TimGary (****)

Date 12-14-2015 20:07

Thanks all for your responses.

We're using GMAW with ER100S to weld 12560 to itself or 41600, and ER70S to weld either to A572.
My question about ASTM or UNS identification is just an attempt to determine an AWS B2.1 - M# for material grouping.

Tim

By pipewelder_1999 (****)

Date 12-14-2015 23:17

If you are using it for armor protection, there is often no need to match base metal strength since with material of that hardness, its pretty difficult.

If you are using it and basing design criteria on the properties listed for the base metal, be VERY careful.

M11 may be close if there is a clause referring to unlisted materials with near matching properties but I dont have that info off the top of my head.

Much of the wear resistant plate is HSLA Q&T (A514/A517) with modified or minimum tempering.

Gerald

By pipewelder_1999 (****)

Date 12-14-2015 23:23

Henry,

Many of the manufacturers suggest E70 Electrodes for their wear plate material and armor plate. The lower strength filler metal is much more forgiving of the lack of ductility in the base metal and also possible base metal/weld metal dilution.

As the weld metal tensile strength goes up, the need for preheat increases with AR plate.

If a product were being designed based upon the mechanical properties and actual thicknesses of the base metal, then the filler metal would need to match the stress levels to be encountered at the joint. I just don't think thats what is done with AR plate that much but when it is, then the weld metal should be matched accordingly.

Hope all is well.

Gerald

By ssbn727 (*****)

Date 12-15-2015 02:43

Which is what I just said Gerald... It all depends on the application in deciding whether or not the job calls for E11018, 9018, 8018 or 7018 which is more than likely the case because of undermatching resulting in a lower amount of martensite that will be found resulting in much more ductile joint... We're both on the same page. :grin:

Respectfully,
Henry