ISO/ASTM standards in additive manufacturing: what you need to know and what each one is used for

The regulations governing additive manufacturing are the content that attracts the fewest views but determines the most contracts. As soon as a part enters a regulated sector—aerospace, medical, energy, pressure equipment—the question shifts from whether the technology works to who guarantees that it works.

This is the map, without going into the details of each clause.

Who publishes what

There are two families that should not be confused:

ISO/ASTM 529xx: Joint ISO and ASTM standards, applicable to any sector. They form the common ground.
Sector-specific standards: aerospace (the SAE AMS family, and each manufacturer's own specifications), medical (with medical device regulations taking precedence), pressure equipment (the European directive and design codes). These take precedence over the previous ones within their respective fields.

And a time-saving warning: in aeronautics and medicine, the general rule is almost never enough. What matters is the end customer's specification, which is usually more demanding and not always publicly available.

The five you need to know

Standard	What it's about	When you need it
ISO/ASTM 52900	Vocabulary and general principles. Defines the seven process groups and terminology	Always, even if it's just to speak the same language in a specification
ISO/ASTM 52904	Process requirements for metallic PBF focused on critical part quality. It translates "doing it right" into requirements	When the part has a structural or safety function
ISO/ASTM 52907	Characterization of powder: sampling, size distribution, chemistry, density, flowability	Whenever you buy, reuse, or blend powder. It's the basis of traceability
ISO/ASTM 52920 and 52930	Plant and installation qualification: what requirements a production facility meets and how an installed machine is verified	When you want to be audited as a supplier, or when you audit one
ISO/ASTM 52921	Coordinate systems and orientation nomenclature	More useful than it seems: it allows you to write on a drawing how the part should be oriented

In addition to these, there are the usual tests, which are not specific to additive manufacturing but are applied the same way: tensile strength, hardness, fatigue, metallographic analysis, and non-destructive testing — radiography, ultrasound and, increasingly, computed tomography, which is the only practical way to see pores and powder trapped inside a closed part.

What they will actually ask you for

When a serious customer orders a qualified part, what comes in next is almost always this list:

Powder Traceability: casting, certificate of analysis, number of reuses, and the criteria for its removal. This is found in powder reuse.
Frozen Parameters: the documented manufacturing parameter set and the commitment that it will not change between batches without requalification.
Process Log: what happened during manufacturing. This is where closed-loop control ceases to be a commercial advantage and becomes a document.
Control Specimens: manufactured in the same build plate as the part, tested to demonstrate that the batch complies.
Documented Heat Treatment: cycle, furnace, and temperature record.
Dimensional Report and, if applicable, non-destructive testing.
Orientation and position on build plate recorded: because anisotropy means that the same part in two orientations is not the same part.

None of those seven points are difficult. The difficult part is starting to register them once the part has already been manufactured, because then it's impossible. It's the same warning as in part qualification: registering while it's being manufactured is almost free; reconstructing it afterward is not possible.

What does this mean when choosing a machine and supplier?

Three practical consequences:

A machine with closed parameters complicates qualification. If you can't document the parameter set because you don't know it, you depend on the manufacturer certifying it for you, and on them not changing it. With open parameterization the parameter set is yours and you document it.

Process data must be able to be output. If the build log remains inside the machine in a format that no one can read, it's useless as evidence. This is one of the four things we consider unacceptable, and it's written down.

Qualification is poorly inherited. A part that is qualified on one machine is not qualified on another, even of the same model, without verifying the equivalence between the two. This is what 52930 regulates, and it is the reason why a distributed manufacturing network needs the same parameter set and the same machine at all nodes—which is exactly the approach of AdditiveDelivery.

Where to start if you have nothing

Without a regulated sector involved, two steps are enough to be reasonably covered:

Adopt the 52907 standard for powder casting and keep a thorough record of castings and reuses. It's inexpensive and answers half the awkward questions.
Freeze and document the parameter sets for the alloys you use, along with the corresponding sample specimens.

Therefore, the day a client arrives demanding qualifications, the conversation starts at point five and not at point zero.

If you need to qualify a specific part, the complete process is explained in how to qualify an LPBF part. And if you want to know the added cost of all this, it's broken down in how much does a metal-printed part cost.