A kind of low temperature resistant toughness h-shaped steel and its production process
A low-temperature toughness and production process technology, applied in metal rolling and other directions, can solve the problems of poor low-temperature impact resistance, low-temperature toughness, and brittle fracture, and achieve low ductile-brittle transition temperature and good low-temperature impact resistance , the effect of improving the quality
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Embodiment 1
[0014] Example 1, the low temperature toughness H-shaped steel has the following chemical components in mass percentage: carbon: 0.11%, silicon: 0.22%, manganese: 1.40%, phosphorus: 0.008%, sulfur: 0.002%, niobium: 0.042%, Als: 0.028%, the balance is iron and impurity elements.
[0015] The steel undergoes molten iron pretreatment→converter smelting→argon blowing in ladle→LF refining→full-protection casting of shaped blanks→H-shaped steel wire rolling, and finally the rolled piece is cooled. Among them, H-shaped steel wire rolling includes rough rolling and finishing rolling. The operation that the present invention does not mention all can adopt prior art.
[0016] Among them, the rolling process parameters are: heating temperature 1246°C, initial rolling start temperature 1120°C, finish rolling start temperature 941°C, finish rolling finish temperature 822°C;
[0017] The cooling process parameters are: the rolled piece is cooled at a cooling rate of 75°C / s to a phase tran...
Embodiment 2
[0019] Example 2, the low temperature toughness H-shaped steel has the following chemical components in mass percent: carbon: 0.10%, silicon: 0.26%, manganese: 1.42%, phosphorus: 0.007%, sulfur: 0.003%, niobium: 0.040%, Als: 0.019%, the balance is iron and impurity elements.
[0020] The steel undergoes molten iron pretreatment→converter smelting→argon blowing in ladle→LF refining→full-protection casting of shaped blanks→H-shaped steel wire rolling, and finally the rolled piece is cooled. Among them, H-shaped steel wire rolling includes rough rolling and finishing rolling. The operation that the present invention does not mention all can adopt prior art.
[0021] Among them, the rolling process parameters are: heating temperature 1235°C, initial rolling start temperature 1110°C, finish rolling start temperature 945°C, finish rolling finish temperature 833°C;
[0022] The cooling process parameters are: the rolled piece is cooled at a cooling rate of 78°C / s to a phase transit...
Embodiment 3
[0024] Example 3, the low temperature toughness H-shaped steel has the following chemical components in mass percent: carbon: 0.09%, silicon: 0.25%, manganese: 1.39%, phosphorus: 0.005%, sulfur: 0.006%, niobium: 0.038%, Als: 0.022%, the balance is iron and impurity elements.
[0025] The steel undergoes molten iron pretreatment→converter smelting→argon blowing in ladle→LF refining→full-protection casting of shaped blanks→H-shaped steel wire rolling, and finally the rolled piece is cooled. Among them, H-shaped steel wire rolling includes rough rolling and finishing rolling. The operation that the present invention does not mention all can adopt prior art.
[0026] Among them, the rolling process parameters are: heating temperature 1241°C, initial rolling start temperature 1130°C, finish rolling start temperature 946°C, finish rolling finish temperature 818°C;
[0027] The cooling process parameters are: the rolled piece is cooled at a cooling rate of 72°C / s to a phase transit...
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