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Production method for big-thickness ultrawide DIWA353 steel plates

A production method and large-thickness technology, applied in the field of metallurgy, can solve problems affecting the surface quality of steel plates and the impact of use, and achieve the effects of good sensitivity to crack growth, guaranteed stability, and high thermal strength performance

Inactive Publication Date: 2019-11-26
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no domestic production experience for DIWA353 steel plates with a thickness of more than 120mm. Although there are foreign manufacturers, pits are often produced due to the pressing of iron sheets on the surface of the steel plate, which affects the surface quality of the steel plate and affects its further use.

Method used

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  • Production method for big-thickness ultrawide DIWA353 steel plates
  • Production method for big-thickness ultrawide DIWA353 steel plates
  • Production method for big-thickness ultrawide DIWA353 steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the thick and ultra-wide DIWA353 steel plate has a thickness of 145 mm and a width of 3950 mm. The composition of the steel plate is shown in Table 1, and the mechanical properties of the steel plate are shown in Table 2. Concrete process steps are as follows:

[0028] (1) Smelting process: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, and fed with an Al wire of 400m / furnace. When the ladle temperature is 1600°C, it is vacuum treated in a VD furnace, and SiCa block 100kg / furnace is added before vacuuming. The temperature is 0.48 Torr, and the vacuum holding time is 30 minutes;

[0029] (2) Casting process: the casting temperature is 1545°C, and a 31T flat ingot mold is used for casting.

[0030] (3) Heating process: dry the furnace for 40 minutes before steel loading, and stew the steel for 65 minutes; use low-speed steel burning, the heating rate below 1000 °C is 110 °C / h, and the maximum heating...

Embodiment 2

[0036] In this embodiment, the thick and ultra-wide DIWA353 steel plate has a thickness of 150 mm and a width of 3750 mm. The composition of the steel plate is shown in Table 1, and the mechanical properties of the steel plate are shown in Table 2. Concrete process steps are as follows:

[0037] (1) Smelting process: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, and fed with an Al wire of 320m / furnace. When the ladle temperature is 1700°C, the vacuum treatment is carried out in a VD furnace, and SiCa block 96.0kg / furnace is added before vacuuming. Vacuum degree 0.49 Torr, vacuum holding time 40min;

[0038] (2) Casting process: the casting temperature is 1550°C, and a 45T flat ingot mold is used for casting.

[0039] (3) Heating process: dry the furnace for 35 minutes before steel loading, and stew the steel for 1 hour; use low-speed steel burning, the heating rate below 1000 °C is 100 °C / h, and the maximum heating temperat...

Embodiment 3

[0045] In this embodiment, the thickness of the large-thickness and ultra-wide DIWA353 steel plate is 140 mm, and the width is 4000 mm. The composition of the steel plate is shown in Table 1, and the mechanical properties of the steel plate are shown in Table 2. Concrete process steps are as follows:

[0046] (1) Smelting process: molten steel is first smelted in an electric furnace, sent to an LF refining furnace for refining, and fed with an Al wire of 500m / furnace. When the temperature of the ladle is 1650°C, it is vacuum treated in a VD furnace. The temperature is 0.5 Torr, and the vacuum holding time is 30 minutes;

[0047] (2) Casting process: the casting temperature is 1547°C, and a 31T flat ingot mold is used for casting.

[0048] (3) Heating process: dry the furnace for 45 minutes before steel loading, and stew steel for 80 minutes; adopt low-speed steel burning, the heating rate below 1000 °C is 120 °C / h, and the maximum heating temperature is 1260 °C; before tappin...

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Abstract

The invention discloses a production method for big-thickness ultrawide DIWA353 steel plates, and belongs to the technical field of metallurgy. The production method comprises the procedures of smelting, casting, heating, rolling, water cooling and heat treatment. The smelting procedure comprises electric furnace initial smelting, LF furnace refining and VD furnace vacuum treatment; the heat treatment procedure adopts normalization and tempering treatment processes; the normalization temperature is 950+-10 DEG C; the heating time is 4.5-5 h; the insulation time is 0.8-1 min / mm; the furnace iscooled to 910+-10 DEG C; the insulation time is 1.2-1.5 min / mm; the water cooling is performed by 6-8 min after normalization; and the red returning temperature of steel plates is not higher than 600DEG C. The produced steel plates are higher in purity, uniform in component, compact in internal, smooth in surface, free of recess and excellent in mechanical performance, and can be used for manufacturing high-pressure boiler drums, nuclear energy containers and other high-pressure resisting containers.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a large-thickness and ultra-wide DIWA353 steel plate. Background technique [0002] DIWA353 steel plate is a fine-grained low-alloy structural steel with good weldability. The steel has high medium-temperature yield strength, good plasticity and toughness. It is mainly used for boiler drums and pressure Preparation of containers, pipes and other components. Due to long-term high temperature (350-450°C), high pressure (150-250kg / cm 2 ) and corrosive environments, the boiler industry has very strict requirements on the quality of materials and their safety and reliability. In recent years, with the rapid development of the petrochemical industry, higher requirements have been put forward for the specifications and quality indicators of this kind of steel plate in China. At present, large thickness and ultra-wide DIWA353 steel plate has become...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C21D8/02C21D1/28C22C33/04
CPCC21D1/28C21D8/0226C21D2211/002C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 邹俊刘彦强秦红新乔蕾曾小峰姚远方
Owner WUYANG IRON & STEEL
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