H13 (material number 1.2344) is a hot-work tool steel. In additive manufacturing it is chosen for dies and inserts that must survive heat, repeated thermal cycling and tool-side wear — and where printed cooling channels close to the cavity change how the tool behaves. It is harder to print than maraging steel, so it is worth the effort only when the duty is genuinely hot-work.
Already know the grade? See the H13 powder specification and price or request an H13 quote.
Where H13 fits
| Tooling duty | Why H13 is reviewed | What to define for acceptance |
|---|---|---|
| Die-casting insert | Hot-work strength, cooling close to the cavity | Thermal fatigue and heat checking, erosion, heat treatment, channel integrity |
| Conformal-cooled injection tool | Cycle control with internal channels | Coolant and corrosion, polishing, hardness, channel cleaning, dimensional stability |
| Hot-work nozzle, core pin or insert | Temperature, contact and repeated thermal loading | Crack sensitivity, surface, machining, repair route, life test |
| Extrusion or forming tooling feature | Local redesign of a difficult tool zone | Load, wear, hybrid build onto a machined base, inspection |
The alloy is not new; what AM changes is the geometry. H13 becomes interesting when cooling or local redesign is impossible to machine.
H13 or M300?
- H13 when thermal cycling and heat checking dominate — die casting and hot-work tools.
- M300 when the tool values post-aged strength, precision and dimensional stability with milder thermal duty — most plastic injection molds. See M300 maraging steel powder.
- 420 or 12Cr9Ni when corrosion from coolant or polymer is the main problem. See the 420 and 12Cr9Ni grade pages.
For a side-by-side decision, use the H13 vs M300 powder guide.
Cracking, preheat and heat treatment
H13’s carbon content makes it prone to cracking and residual stress in laser powder bed fusion. The build plan — not the powder alone — controls whether a tool survives:
| Stage | Evidence to define or request | Why it matters |
|---|---|---|
| Powder | Governing chemistry, PSD and method, morphology, flow, lot traceability, reuse state | Establishes whether the lot fits the machine and parameter route |
| Build | Preheat strategy, supports, geometry risks, machining stock, stress-relief sequence | Crack control and thermal history decide tool integrity |
| Heat treatment | Hardening and tempering route, furnace record, hardness target and sampling | The printed condition is not the tool condition |
| Tool acceptance | Dimensions, channel proof-pressure and leak test, powder removal, hardness, surface | Acceptance must reflect the insert’s function, not only coupon density |
Tool hardness alone does not prove thermal-fatigue life. Define the production trial — contact temperature, cycle, coolant, surface condition and repair strategy — before claiming a life improvement.
RFQ fields
State the tooling process, insert geometry, H13 specification, machine and process, target PSD, quantity, thermal cycle, coolant and channel constraints, heat treatment and hardness target, machining and polishing, inspection and documents. Send an H13 powder inquiry.