Introduction In addition to high-temperature strength and resistance to high-temperature oxidation corrosion, these parts also require sufficient toughness, good processability and weldability, and a certain degree of structural stability depending on their uses. China began producing heat-resistant steel in 2006. Later, some new types of low-alloy heat-strength steel were developed, thereby increasing the working temperature of pearlitic heat-strength steel to ~°C. In addition, some new low-chromium-nickel oxidation-resistant steel types were also developed.
Characteristics
It has high thermal-work-study properties and can be used as intake valves for internal combustion engines and exhaust valves for light-load engines.
Chemical composition
Carbon.～.Silicon.～
Manganese
Sulfur
Phosphorus
Chromium.～
Nickel
Mechanical properties
Tensile strength & quenching and tempering,
Conditional yield strength. Quenching and tempering,
Elongation & (%) Quenching and tempering,
Section reduction rate & (%) Quenching and tempering,
Hardness annealing,
Heat treatment
) Quenching, ~℃ oil cooling
) Tempering, ~℃ oil cooling.
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