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High-weldability fine-grain low-alloy structural steel plate and production method thereof

A technology for structural steel plates and production methods, which is applied in the field of fine-grained low-alloy structural steel plates, can solve problems such as the difficulty in purchasing extra-thick plates and the decline in the comprehensive quality of steel plates, and achieve excellent comprehensive mechanical properties, uniform performance, and low inclusion content Effect

Inactive Publication Date: 2013-05-08
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only is it difficult to purchase extra-thick plates for the domestic boiler manufacturing industry, but the overall quality of foreign steel plates has also declined.

Method used

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  • High-weldability fine-grain low-alloy structural steel plate and production method thereof
  • High-weldability fine-grain low-alloy structural steel plate and production method thereof
  • High-weldability fine-grain low-alloy structural steel plate and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The actual composition (by weight percentage) of a fine-grained low-alloy structural steel sheet with good weldability in this embodiment is shown in Table 1.

[0019]

[0020] The production method of this embodiment is as follows: (1) Smelting process: [P] ≤0.007%, no slag can be seen during the tapping process, 2Kg / t aluminum ingots are added with the steel flow; the molten steel is first smelted by the electric furnace and sent to the LF refining furnace Refining, after blowing argon on the refining furnace base, add slag and deoxidizer after powering up and heating; add Si-Ca block 100Kg / furnace before vacuum, and feed Al wire to adjust Al content; vacuum treatment 66Pa, hold time 15min;

[0021] (2) Casting process: Keep the temperature at 1550℃ after vacuum break, and then use 27.6t slab mold for casting;

[0022] (3) Heating process: use low-speed steel burning, heating rate 110°C / h below 1000°C, maximum heating temperature 1240°C, holding 1220°C; appropriately cooling...

Embodiment 2

[0037] The actual composition (by weight percentage) of a fine-grained low-alloy structural steel sheet with good weldability in this embodiment is shown in Table 6.

[0038] Table 6 Chemical composition of the steel plate of Example 2

[0039]

[0040] The production method of this embodiment is as follows: (1) Smelting process: [P] ≤ 0.006%, no slag can be seen during the tapping process, 2Kg / t aluminum ingots are added with the steel flow; the molten steel is first smelted by the electric furnace and sent to the LF refining furnace Refining, after blowing argon on the refining furnace base, add slag and deoxidizer after powering up and heating; add Si-Ca block 100Kg / furnace before vacuum, and feed Al wire to adjust Al content; vacuum treatment 66Pa, hold time 20min;

[0041] (2) Casting process: Keep the temperature at 1545℃ after vacuum break, and then use 27.6t slab mold for casting;

[0042] (3) Heating process: use low-speed steel burning, heating rate 110°C / h below 1000°C,...

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Abstract

The invention relates to a high-weldability fine-grain low-alloy structural steel plate and a production method thereof. The high-weldability fine-grain low-alloy structural steel plate provided by the invention comprises the following chemical components in percentage by weight: 0.12-0.15% of C, 0.10-0.50% of Si, 1.00-1.60% of Mn, at most 0.020% of P, at most 0.010% of S, 0.60-1.0% of Ni, 0.20-0.40% of Cr, 0.20-0.40% of Mo, 0.005-0.020% of Nb, 0.015-0.05% of Al, and the balance of Fe and inevitable impurities. The production method of the steel plate comprises the following steps: electrosmelting, carrying out LF (ladle furnace) / VD (vacuum degasser) refining, carrying out die casting, heating an ingot, rolling a plate, cooling with water, and carrying out heat treatment to obtain the qualified steel plate. The room-temperature mechanical properties of the steel plate provided by the invention are equivalent to those of the foreign product; the grain fineness is Grade 7-8, the structure is full-bainite, the inclusions are lower than Grade 1, the inclusion content is low, the steel quality is pure, and the steel has excellent comprehensive mechanical properties; the mechanical properties of the steel plate completely satisfy the standard requirements of 145mm thick steel plate, and the steel plate has favorable compatibility.

Description

Technical field [0001] The invention relates to a fine-grained low-alloy structural steel plate with good weldability, and at the same time, to a production method of the steel plate. Background technique [0002] For a long time, due to the thickness of the steel plate and the wide plate surface, the current thickness is up to 145mm. The production equipment and technology of the steel plant are greatly restricted. There is a shortage of extra-thick plate manufacturers worldwide, the purchase channel is narrow, and the delivery cycle is long. . Due to the huge increase in demand in the international steel market, resources are very scarce, and material supply is facing a serious crisis. Not only is it difficult to purchase extra-thick plates in the domestic boiler manufacturing industry, but the overall quality of foreign physical steel plates has also declined. Summary of the invention [0003] The purpose of the present invention is to provide a fine-grained low-alloy structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/48
Inventor 李欢欢车金峰
Owner WUYANG IRON & STEEL
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