Steel for high heat input welding ship body structure and manufacturing method of steel
A technology for high-energy welding and structural steel, applied in the field of steel production, can solve the problems of secondary oxide aggregation, large regional performance differences, and regional performance differences of ship plates, so as to reduce the harm of sulfur and improve the Product performance, the effect of improving internal quality
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Embodiment 1
[0020] A kind of high heat input welding hull structure steel provided in this embodiment has a thickness of 35mm, and its chemical composition and mass percentage are as follows: C: 0.063%, Si: 0.12%, Mn: 1.23%, P: 0.011%, S: 0.0015 %, Nb: 0.018%, V: 0.023%, Ti: 0.016%, Cr: 0.05%, Mo: 0.009%, Ni: 0.13%, Al: 0.011%, Mg: 0.0013%, N: 0.0031%, without adding Ca , the balance being Fe and unavoidable impurities.
[0021] Its manufacturing method comprises the following steps:
[0022] S1. After desulfurization, the molten iron is blown in a converter, LF smelted, RH vacuum treated, and CCM cast. The composition of the smelted billet meets the above requirements;
[0023] S2. The cast slab is heated by a walking heating furnace and then rolled. The second opening temperature is 886°C, the final rolling temperature is 819°C, the water entry temperature is 785°C, and the red return temperature is 631°C;
[0024] S3. The steel plate is tempered at 283°C for 20 minutes, and air-coole...
Embodiment 2
[0026] A kind of high heat input welding hull structure steel provided in this embodiment has a thickness of 56mm, and its chemical composition and mass percentage are as follows: C: 0.069%, Si: 0.17%, Mn: 1.36%, P: 0.010%, S: 0.0011 %, Nb: 0.019%, V: 0.029%, Ti: 0.017%, Cr: 0.03%, Mo: 0.010%, Ni: 0.16%, Al: 0.010%, Mg: 0.0009%, N: 0.0040%, without adding Ca , the balance being Fe and unavoidable impurities.
[0027] Its manufacturing method comprises the following steps:
[0028] S1. After desulfurization, the molten iron is blown in a converter, LF smelted, RH vacuum treated, and CCM cast. The composition of the smelted billet meets the above requirements;
[0029] S2. The cast slab is heated by a walking heating furnace and then rolled. The second opening temperature is 866°C, the final rolling temperature is 778°C, the water entry temperature is 765°C, and the redness temperature is 593°C;
[0030] S3. The steel plate is tempered at 232°C for 20 minutes, and air-cooled t...
Embodiment 3
[0032] This embodiment provides a steel for large heat input welding hull structure, with a thickness of 90 mm, and its chemical composition and mass percentage are as follows: C: 0.078%, Si: 0.29%, Mn: 1.47%, P: 0.009%, S: 0.0008 %, Nb: 0.027%, V: 0.033%, Ti: 0.019%, Cr: 0.03%, Mo: 0.008%, Ni: 0.19%, Al: 0.013%, Mg: 0.0014%, N: 0.0029%, without adding Ca , the balance being Fe and unavoidable impurities.
[0033] Its manufacturing method comprises the following steps:
[0034] S1. After desulfurization, the molten iron is blown in a converter, LF smelted, RH vacuum treated, and CCM cast. The composition of the smelted billet meets the above requirements;
[0035] S2. The cast slab is heated by a walking heating furnace and then rolled. The second opening temperature is 818°C, the final rolling temperature is 779°C, the water entry temperature is 751°C, and the redness temperature is 550°C;
[0036] S3. The steel plate is tempered at 267°C for 20 minutes, and air-cooled to r...
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