Production method of hot rolled steel strip Q355B for economical welded pipe
A technology of Q355B and production method, which is applied in the field of production of economical welded pipe hot-rolled steel strip Q355B, can solve the problems of difficult processing technology, affecting comprehensive processing performance, and serious Bauschinger effect, and achieves the reduction of Bauschinger effect, reduce the production of titanium oxide, and reduce the effect of coiling temperature
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Embodiment 1
[0051] Step ①: The carbon content of the Q355B hot-rolled steel strip for welded pipes of the present invention is 0.06% at the end point of converter smelting, and the content of sulfur element is 0.020%, and the temperature at the end point of converter smelting is controlled at 1650°C; The element content is 0.15%. Aluminum-containing materials are added for deoxidation during the tapping process. According to the manganese-carbon ratio ≥ 2.5, ferromanganese is added for alloying. The minimum manganese element content in the steel is calculated to be: 0.15%*2.5=0.375%; The sulfur element content is 0.020%, and the manganese-sulfur ratio is ≥ 15. The calculated minimum manganese element content in the steel is: 0.020%*15=0.3%. The content of manganese in steel is 0.375%. The converted ferromanganese alloy addition amount is (0.375-0.10) / 0.65 / 0.90*10=4.70kg / t, and the converter tapping amount is 100t, that is, the added ferromanganese alloy amount is 470kg.
[0052] Step ②: ...
Embodiment 2
[0060] Step ①: The carbon content of the Q355B hot-rolled steel strip for welded pipes of the present invention is 0.06% at the end point of converter smelting, and the content of sulfur element is 0.020%, and the temperature at the end point of converter smelting is controlled at 1645°C; carbon powder is added during the tapping process to make the carbon in the steel The element content is 0.17%. Aluminum-containing materials are added for deoxidation during the tapping process. According to the manganese-carbon ratio ≥ 2.5, ferromanganese is added for alloying. The minimum manganese element content in the steel is calculated to be: 0.17%*2.5=0.425%; The sulfur element content is 0.020%, and the manganese-sulfur ratio is ≥ 15. The calculated minimum manganese element content in the steel is: 0.020%*15=0.3%. Manganese element content is 0.425%. The converted ferromanganese alloy addition amount is (0.425-0.10) / 0.65 / 0.90*10=5.56kg / t, and the converter tapping amount is 100t, t...
Embodiment 3
[0069] Step ①: The carbon content of the Q355B hot-rolled steel strip for welded pipes of the present invention is 0.06% at the end point of converter smelting, and the content of sulfur element is 0.020%, and the temperature at the end point of converter smelting is controlled at 1650°C; The element content is 0.18%. Aluminum-containing material is added for deoxidation during the tapping process. According to the manganese-carbon ratio ≥ 2.5, ferromanganese is added for alloying. The minimum manganese element content in the steel is calculated to be: 0.18%*2.5=0.45%; The sulfur element content is 0.020%, and the manganese-sulfur ratio is ≥ 15. The calculated minimum manganese element content in the steel is: 0.020%*15=0.3%. Manganese element content is 0.45%. The converted ferromanganese alloy addition amount is (0.45-0.1) / 0.65 / 0.90*10=5.98kg / t, and the converter tapping amount is 100t, that is, the added ferromanganese alloy amount is 598kg.
[0070] Step ②: Bring the cont...
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