What grades of materials resist grain growth?
Leave a message
Grains such as H13+Ti, H13+Nb, H13+V, Al-Killed H13, H13+W, PM-H13 and Inconel 718 have good resistance to grain growth and are appropriate for hot runner systems .
1. Microalloyed H13 Series (Standard Option)
Grade:
Main Ingredient
Mechanism of inhibition
Operating Temperature Range
Ti + H13
Ti
Forms very stable TiC, pinning grain boundaries
≤1200 C°
H13 + Nb
Nb
NbC dynamically precipitates to avoid grain engulfment
≤ 1100 °C
H13+V *
VCs
Stable medium temperature, moderate cost.
≤ 900 °C
H13 + W/Mo
W/Mo.
High-melting-point carbides inhibit grain boundary migration
≤ 1300 °C
Advantages: Upgraded from classic H13, good machinability, frequently utilised in essential components such as nozzles and manifolds.
2. Fine-grained steel in nature
Al-Killed H13 (Aluminium Deoxidised H13) : During heating, AlN dispersion inhibits grain growth and assures a fine original microstructure (grade 5-8); it is the first choice for new moulds.
Fine-grained 4Cr5MoSiV1: Controlled deoxidation in the melting process provides a homogeneous, fine-grained microstructure.
Features: No need for costly alloys, very cost-effective, appropriate for mass production.
3. Powder Metallurgy Steel (Applications for High-end)
PM-H13: Uses powder metallurgy technique. The starting grain size is 8-10, the carbide distribution is exceptionally uniform and the resistance to grain growth is much superior than conventional steels.
ASP-23 (High-Speed Steel): High V and Mo contents, ultra-fine microstructure and plentiful distributed carbides, exceptional high temperature resistance.
Advantages Good isotropy Fatigue life >30% higher Good for precision injection moulds in med and optical applications.
4. High temperature resistant alloys (ultra high temperature applications)
Class
Type 2
Maximum service temperature
Features
Material Inconel 718
Nickel-base alloy
1100C
γ' phase strengthening, high oxidation resistance
Haynes alloy 230
Nickel- chromium alloy
1150 °C
Great creep resistance
Stellite 6
Cobalt alloy
1000°C
It is corrosion and wear resistant and can be used in a corrosive environment
High cost, difficult to process, normally used to replace essential components.
5. Advanced ceramic matrix composites (cutting edge research)
SiC/SiC, Al2O3/ZrO2: Grain structure without metal, temperature resistance > 1400 °C, hardly any thermal deformation.
