Precise hardening, tempering & joining of PH stainless steels such as 17-4PH or 15-5PH. Dimensionally stable, tight joins for aerospace, energy, toolmaking & Mechanical engineering.
Hardenable stainless steels (e.g. 17-4PH/1.4542, 15-5PH/1.4545) combine corrosion resistance with very high strength. Listemann provides Heat treatment (hardening, tempering according to H900-H1150), Vacuum-brazing and EB welding – process-safe and low distortion, including testing and documentation concept.
Curing cycles (e.g. H900-H1150) with closely controlled temperature-time profiles
Solution annealing & ageing for targeted property adjustment
Vacuum-brazing of complex PH components, flux-free and leak-proof
EB welding high-strength components, minimal heat input
Quality assurance: hardness mapping, tensile/shear tests, tightness, crack testing (PT/UT)
Aerospace: Structural and actuator components
Power & turbomachinery: temperature and load-resistant components
Tool & die-making: wear-resistant inserts, inserts
Mechanical/apparatus engineering: high-strength, corrosion-resistant parts
PH steels achieve high strengths at moderate temperatures (e.g. H900-H1150). Nickel-based alloys withstand higher continuous temperatures and aggressive media better; the choice of material depends on the load spectrum and operating environment.
Nickel-based or precious metal-based solders are generally suitable for hardenable steels. Their selection depends on the operating temperature, medium, gap size and the required toughness of the joining zone.
Depending on the solder and geometry, a uniform gap dimension of around 0.02 to 0.08 millimeters is recommended, which, together with defined solder guidance and stable fixing, ensures tightness and strength.
Hardenable steels can be combined with other materials if suitable interlayers are used and the joining geometry is adapted to stress management and different thermal expansions.
For pronounced temperature changes, higher tempering temperatures (e.g. H1025 or H1150) tend to be selected in order to increase toughness and thermal shock resistance; thermal cycle tests are also recommended.
The H900 condition provides very high strength with lower toughness, while H1025 to H1150 offer more toughness and impact strength with lower hardness; the decision is based on the load spectrum.
Distortion is minimized by a symmetrical design, suitable fixtures and gentle heating and cooling ramps and, if necessary, further reduced by stress relief annealing before the final state.
Joining zones should be designed with load paths parallel to the joining surface, with radii instead of notches and without peeling load, whereby large contact zones and good service accessibility facilitate inspection.
Phone: +41 52 245 18 55
Mobile: +41 77 442 46 91
t.bachmann@listemann.com
Phone: +423 375 90 12
Mobile: +423 78 05 401
t.bitschnau@listemann.com
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