Production method of steel applied to high strength huge line energy welded ship

Abstract

The invention discloses a production method of steel applied to a high strength huge line energy welded ship. The steel is composed of C, Mn, Si, Ni, Cr, V, Ti, P, S, O, Als, Mo, Fe and unavoidable impurities. The preparation method comprises the steps of liquid steel desulfurization treatment, converter or electric furnace smelting, ladle furnace or ladle argon blowing refining, continuous casting and rolling into a plate, wherein when converter or electric furnace smelting is carried out, ferrovanadium, ferronickel and ferrotitanium are added with scrap in front of a furnace. During a refining process, chromium and molybdenum are added, so that the chemical compositions in the steel meet the composition requirements of the steel plate. When continuous casting is carried out, the temperature of liquid steel coming into a crystallizer is controlled at the temperature of 1530 to 1550 DEG C. When rolling into the plate is carried out, the rolling starting temperature is 1200 to 1220 DEG C; the controlled rolling end three cumulative reduction rate is no less than 42%; and the rolling finishing temperature is 880 to 900 DEG C.

Description

technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a production method of high-strength super-large heat input welded hull steel. Background technique

[0002] With the rapid development of the world's shipbuilding industry, the production of high-strength marine steel with excellent welding performance (large heat input welding) has become a trend. Compared with hull welding, large input energy welding has the advantages of fast welding speed and fewer welding construction passes, which significantly improves the efficiency of welding construction and saves welding construction costs. At present, domestic high-strength ship hull steels generally can only be welded with less than 50KJ / cm heat input. WISCO and Wuyang Iron and Steel Co., Ltd. have conducted research on large heat input steels. The large heat input steel developed by Wuhan Iron and Steel has added alloy Ni by reducing the C content. The toughness ...

Examples

Embodiment 1

[0015] A production method of high-strength super-large heat input welded hull steel, the steel is composed of the following components in weight percentage: C: 0.05, Mn: 1.6, Si: 0.4, Ni: 1.7, Cr: 0.7, V: 0.03, Ti: 0.05, P≤0.020, S≤0.015, O: 0.005, Als: 0.005, Mo: 0.4, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: molten steel desulfurization treatment, converter or electric furnace Smelting, ladle furnace or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferro-vanadium, ferro-nickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochromium and ferromolybdenum are added during the refining period. Make the chemical composition in the steel meet the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the crystallizer during continuous casting is controlled at 1530°C, and...

Embodiment 2

[0017] A production method of high-strength super-large energy-intensity welded hull steel, the steel is composed of the following components in weight percentage: C: 0.07, Mn: 1.2, Si: 0.6, Ni: 1.5, Cr: 0.9, V: 0.01, Ti: 0.15, P≤0.020, S≤0.015, O: 0.001, Als: 0.025, Mo: 0.2, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: molten steel desulfurization treatment, converter or electric furnace Smelting, ladle furnace or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferro-vanadium, ferro-nickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochromium and ferromolybdenum are added during the refining period. Make the chemical composition in the steel meet the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the crystallizer during continuous casting is controlled at 1550°...

Embodiment 3

[0019] A production method of steel for high-strength super-large heat input welded hull, the steel is composed of the following components in weight percentage: C: 0.06, Mn: 1.4, Si: 0.5, Ni: 1.6, Cr: 0.8, V: 0.02, Ti: 0.10, P≤0.020, S≤0.015, O: 0.003, Als: 0.015, Mo: 0.3, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: molten steel desulfurization treatment, converter or electric furnace Smelting, ladle furnace or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferro-vanadium, ferro-nickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochromium and ferromolybdenum are added during the refining period. Make the chemical composition in the steel meet the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the crystallizer during continuous casting is controlled at 1540°C,...

technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a production method of high-strength super-large heat input welded hull steel. Background technique

[0002] With the rapid development of the world's shipbuilding industry, the production of high-strength marine steel with excellent welding performance (large heat input welding) has become a trend. Compared with hull welding, large input energy welding has the advantages of fast welding speed and fewer welding construction passes, which significantly improves the efficiency of welding construction and saves welding construction costs. At present, domestic high-strength ship hull steels generally can only be welded with less than 50KJ / cm heat input. WISCO and Wuyang Iron and Steel Co., Ltd. have conducted research on large heat input steels. The large heat input steel developed by Wuhan Iron and Steel has added alloy Ni by reducing the C content. The toughness ...

Examples

Embodiment 1

[0015] A production method of high-strength super-large heat input welded hull steel, the steel is composed of the following components in weight percentage: C: 0.05, Mn: 1.6, Si: 0.4, Ni: 1.7, Cr: 0.7, V: 0.03, Ti: 0.05, P≤0.020, S≤0.015, O: 0.005, Als: 0.005, Mo: 0.4, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: molten steel desulfurization treatment, converter or electric furnace Smelting, ladle furnace or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferro-vanadium, ferro-nickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochromium and ferromolybdenum are added during the refining period. Make the chemical composition in the steel meet the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the crystallizer during continuous casting is controlled at 1530°C, and...

Embodiment 2

[0017] A production method of high-strength super-large energy-intensity welded hull steel, the steel is composed of the following components in weight percentage: C: 0.07, Mn: 1.2, Si: 0.6, Ni: 1.5, Cr: 0.9, V: 0.01, Ti: 0.15, P≤0.020, S≤0.015, O: 0.001, Als: 0.025, Mo: 0.2, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: molten steel desulfurization treatment, converter or electric furnace Smelting, ladle furnace or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferro-vanadium, ferro-nickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochromium and ferromolybdenum are added during the refining period. Make the chemical composition in the steel meet the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the crystallizer during continuous casting is controlled at 1550°...

Embodiment 3

[0019] A production method of steel for high-strength super-large heat input welded hull, the steel is composed of the following components in weight percentage: C: 0.06, Mn: 1.4, Si: 0.5, Ni: 1.6, Cr: 0.8, V: 0.02, Ti: 0.10, P≤0.020, S≤0.015, O: 0.003, Als: 0.015, Mo: 0.3, and the rest are Fe and unavoidable impurities. The preparation method includes the following steps: molten steel desulfurization treatment, converter or electric furnace Smelting, ladle furnace or ladle blowing argon refining, continuous casting, and rolling into plates. During converter or electric furnace smelting, ferro-vanadium, ferro-nickel, and ferro-titanium are added with scrap steel in front of the furnace; ferrochromium and ferromolybdenum are added during the refining period. Make the chemical composition in the steel meet the requirements of the composition of the steel plate, wherein the temperature of the molten steel entering the crystallizer during continuous casting is controlled at 1540°C,...