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Ship structure steel plate capable of being welded with high liner energy and method for producing same

A technology for large line energy welding and structure, which is applied in manufacturing tools, metal rolling, temperature control, etc., can solve the problems of low welding line energy, difficult to control, complicated process, etc., and achieves low crack sensitivity and easy control. , the effect of simple process

Inactive Publication Date: 2010-06-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The welding line energy is low, some can only be 50~100kJ / cm
[0006] 2. Some must be produced by quenching and tempering process, the process is complicated and the cost is high
[0007] 3. Some contain rare earth elements, which are not easy to control
[0008] 4. There are many precious metals used in steel, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Chemical composition Wt%: C 0.05; Si 0.20; Mn 1.50; Ni 0.25; Nb 0.04; V 0.03; Ti 0.03; N 0.007; Al 0.10; B 0.004; P<0.010; S<0.005; the rest is Fe and unavoidable Impurities.

[0017] The manufacturing process of the present invention is hot metal pretreatment → converter steelmaking → ladle deoxidation alloying → refining treatment (LF furnace, RH furnace, fine-tuning composition, etc.) → slab casting → slab slow cooling → heating → primary descaling → controlled rolling System → control cooling → straightening → flaw detection → storage; the following process parameters are controlled in the process:

[0018] Refining molten iron or molten iron and scrap steel through a converter, using Ti iron and Al wire to deoxidize, adjust the composition, and then perform continuous casting and hot rolling;

[0019] The hot rolling process is to heat the slab to 1200°C and soak for 4 hours for hot rolling, rolling into a 40mm thick steel plate, and cooling on-line at a cooling rate of ...

Embodiment 2

[0022] Chemical composition Wt%: C 0.06; Si 0.30; Mn 1.60; Ni 0.30; Nb 0.02; V 0.10; Ti0.05; N 0.01; Al 0.20; B 0.003; P<0.007; S<0.003; the rest is Fe and unavoidable 的impurities.

[0023] Its manufacturing process is to use a converter to refining molten iron or molten iron and scrap steel after steelmaking, using Ti iron and Al wire to deoxidize, and adjust the composition, and then carry out continuous casting and hot rolling.

[0024] The hot rolling process is to heat the slab to 1250°C, soak it for 5 hours for hot rolling, and roll it into a 30mm thick steel plate, and then cool it on-line at a cooling rate of 10°C / s after rolling.

[0025] The tensile strength of the steel plate manufactured in this embodiment is 650Mpa, which is suitable for high heat input welding of 100-200 kJ / cm heat input. After welding, no heat treatment is required, and the impact energy of the heat-affected zone is lower than the base material.

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Abstract

The invention relates to a ship structure steel plate capable of being welded with high liner energy and a method for producing the same, belonging to the technical field of the low-alloy high-strength steel. The ship structure steel plate comprises the following chemical components by weight percent (Wt%): 0.02-0.15 percent of C, 0.05-0.50 percent of Si, 0.50-2.0 percent of Mn, 0.10-0.50 percent of Ni, 0.01-0.15 percent of Nb, 0.01-0.15 percent of V, 0.01-0.08 percent of Ti, 0.002-0.015 percent of N, 0.01-0.5 percent of Al, 0.001-0.005 percent of B, 0.015 percent of P or less, 0.010 of percent of S or less and the balance of Fe and inevitable impurities. The method for producing the ship structure steel plate comprises the following steps: making molten iron or molten iron and waste steel into steel in a rotating furnace, refining the steel, deoxidizing the steel with Ti-Fe and Al wire, adjusting the components, continuously casting the steel into a steel plate slab and hot rolling the steel plate slab into a steel plate having the thickness of 18-80 mm by heating the steel plate slab to 1100-1300 DEG C and soaking steel plate slab for 2-6h, and cooling the steel plate on line at the cooling speed of 1-30 DEG C per second. The invention has the advantages that the welding efficiency of the steel plate can be effectively improved, the labor intensity can be reduced, the resource and the cost can be saved, and the steel plate can be used for the ship and other large-scale structures and facilities.

Description

Technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel, and relates to a steel plate for ship hull structure that can be welded with large heat input (heat input greater than 100 kJ / cm) and a manufacturing method thereof. Background technique [0002] The global economic integration has brought about the continuous increase of global maritime transportation and energy consumption. In order to improve transportation efficiency and reduce maritime fuel consumption, ships have been developing in size and weight. How to further improve shipbuilding efficiency in shipyards is a major issue in the future . On the other hand, the awareness of safety and environmental protection has been rising on a global scale. In the field of steel materials in the shipbuilding field, in addition to meeting the high-growth demand, the requirements for improving safety and reliability are also increasing. Therefore, steel plates for hull structures are req...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21C7/06B21C37/02B21B37/16B21B37/74
Inventor 鞠建斌陈延清张飞虎章军董现春许良红
Owner SHOUGANG CORPORATION