Steel plate with thickness of 80mm and low compression ratio for ocean engineering and manufacturing method thereof
A technology of marine engineering and compression ratio, applied in manufacturing tools, temperature control, furnace type, etc., can solve problems such as large rolling force of rolling mills, and achieve the effects of stable production process, wide applicability and excellent mechanical properties
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Embodiment 1~4
[0028] The chemical composition of the E36-Z35 steel plate for marine engineering with 80mm thickness and low compression ratio of Examples 1 to 4 is shown in Table 1:
[0029] Table 1
[0030]
[0031] The production method of E36-Z35 steel plate for marine engineering with 80mm thickness and low compression ratio of 1~4 is as follows:
Embodiment 1
[0032] The production method of the embodiment of the 80mm thick low compression ratio E36-Z35 steel plate for marine engineering of embodiment 1 is as follows:
[0033] Steelmaking and continuous casting process: target sulfur 0.005% after molten iron desulfurization; converter smelting adopts double slag method for dephosphorization, and converter tapping is used as slag; refining adopts white slag operation, the white slag holding time is 10 minutes, and the total refining time is guaranteed 30 minutes; The vacuum treatment hold time is 15 minutes; the calcium treatment is carried out after the vacuum treatment; the target temperature of the continuous casting tundish is the liquidus temperature + 10℃, and the pulling speed is stable.
[0034] Rolling process: using controlled rolling and controlled cooling process, two-stage rolling; heating temperature of continuous casting billet before rolling is 1180℃; rough rolling temperature is 1000℃, high temperature, low speed and large...
Embodiment 2
[0036] The production method of the embodiment of the 80mm thick low compression ratio E36-Z35 steel plate for marine engineering of embodiment 2 is as follows:
[0037] Steelmaking and continuous casting process: target sulfur 0.004% after molten iron desulfurization; converter smelting adopts double slag method dephosphorization, converter steel tapping as slag; refining adopts white slag operation, white slag holding time is 12 minutes, and the total refining time is guaranteed 35 minutes; The vacuum treatment hold time is 16 minutes; the calcium treatment is carried out after the vacuum treatment; the target temperature of the continuous casting tundish is the liquidus temperature + 20℃, and the drawing speed is stable.
[0038] Rolling process: using controlled rolling and controlled cooling process, two-stage rolling; the heating temperature of the continuous casting billet before rolling is 1250℃; the rough rolling temperature is 1100℃, high temperature, low speed and high re...
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