N4873
Cr-Ni-Si-W steel with good mechanical properties and high resistance to hot corrosion. Suitable for medium-duty engines.
VV33
Precipitation-hardenable austenitic chromium-nickel-manganese steel, with addition of nitrogen for increased high-temperature resistance. Suitable for exhaust valves used in heavy-duty diesel engines.
VV50
Precipitation-hardenable nitrogenous austenitic nickel-chromium-manganese steel, with Nb and W added for increased mechanical strength at high temperatures. Suitable for exhaust valves used in extra heavy duty engines.
VV53
Precipitation-hardenable austenitic steel, with addition of nitrogen for increased high-temperature resistance. Suitable for exhaust valves used in heavy-duty engines working at temperatures up to 800°C.
VV56
Precipitation-hardenable austenitic steel, suitable for exhaust valves used in heavy-duty engines working at temperatures up to 780°C.