Low-alloy high-strength cast steel for low temperature and preparation method thereof

A low-alloy, cast steel technology, applied in the field of alloy material casting, can solve the problems of increasing the tendency of cast steel deformation and cracking, which is not conducive to the safe use of materials, achieve low cost, excellent low-temperature toughness and welding performance, and improve metallurgical quality effect

Inactive Publication Date: 2013-07-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quenching and tempering treatment leads to high yield ratio (≥0.91) of cast steel, which is not conducive to the safe use of

Method used

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  • Low-alloy high-strength cast steel for low temperature and preparation method thereof
  • Low-alloy high-strength cast steel for low temperature and preparation method thereof
  • Low-alloy high-strength cast steel for low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1.1 Mass percentage composition of low-alloy high-strength cast steel:

[0030] Carbon 0.11%, manganese 0.39%, silicon 0.26%, phosphorus 0.015%, sulfur 0.0087%, nickel 1.18%, chromium 0.26%, molybdenum 0.25%, vanadium 0.07%, copper 0.025%, aluminum 0.01%, iron balance.

[0031] 1.2 Preparation method:

[0032](1) Smelting: Using electric furnace + argon-oxygen decarburization dual smelting process, when 2 / 3 of the molten steel is melted, put iron-manganese, iron-silicon, iron-molybdenum alloy and electrolytic nickel, mix evenly, wait until completely melted, and then put in Purify molten steel with pure aluminum deoxidizer;

[0033] (2) Pouring: The temperature of the molten steel is 1650-1700°C. After the molten steel is calmed in the ladle for 2-3 minutes, the pouring begins, and the pouring temperature is controlled at 1590-1620°C;

[0034] (3) Heat treatment: After pouring and molding, the casting should be normalized and high-temperature tempered. The normalizing...

Embodiment 2

[0039] 2.1 Mass percentage composition of low-alloy high-strength cast steel: the composition and mass percentage content of each element are the same as in Example 1.

[0040] 2.2 Preparation method:

[0041] (1) Smelting: Using electric furnace + argon-oxygen decarburization dual smelting process, when 2 / 3 of the molten steel is melted, put iron-manganese, iron-silicon, iron-molybdenum alloy and electrolytic nickel, mix evenly, wait until completely melted, and then put in Purify molten steel with pure aluminum deoxidizer;

[0042] (2) Pouring: The temperature of the molten steel is 1650-1700°C. After the molten steel is calmed in the ladle for 2-3 minutes, the pouring begins, and the pouring temperature is controlled at 1590-1620°C;

[0043] (3) Heat treatment: After pouring and molding, the casting should be normalized and high-temperature tempered. The normalizing temperature is 880°C, and the tempering temperature is 590°C. After holding for 1.5 hours, it is air-cooled ...

Embodiment 3

[0048] 3.1 Mass percent composition of low-alloy high-strength cast steel: The composition is the same as in Example 1.

[0049] 3.2 Preparation method

[0050] (1) Smelting: Using electric furnace + argon-oxygen decarburization dual smelting process, when 2 / 3 of the molten steel is melted, put iron-manganese, iron-silicon, iron-molybdenum alloy and electrolytic nickel, mix evenly, wait until completely melted, and then put in Purify molten steel with pure aluminum deoxidizer;

[0051] (2) Pouring: The temperature of the molten steel is 1650-1700°C. After the molten steel is calmed in the ladle for 2-3 minutes, the pouring begins, and the pouring temperature is controlled at 1590-1620°C;

[0052] (3) Heat treatment: After pouring and molding, the casting should be normalized and high-temperature tempered. The normalizing temperature is 880°C, and the tempering temperature is 600°C. Then it is kept for 1.5 hours and then air-cooled to obtain low-alloy high-strength cast steel....

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Abstract

The invention discloses a low-alloy high-strength cast steel for low temperature, and the cast steel comprises the following components in percentage by weight: 0.10%-0.15% carbon, 0.30%-0.60% of manganese, 0.10%-0.50% of silicon, 0%-0.015% of phosphorus, 0%-0.025% of sulfur, 1.0%-1.4% of nickel, 0.20%-0.35% of chromium, 0.20%-0.35% of molybdenum, 0.03%-0.06% of vanadium, 0%-0.01% of copper, 0%-0.08% of aluminum and the balance of iron. The low-alloy high-strength cast steel is prepared through electric furnace and argon oxygen decarburization duplex smelting and pouring and normalizing and high-temperature tempering treatment. The cast steel disclosed by the invention achieves the tensile strength of 570-590 Mpa, the yield strength of 460-475 MPa, the elongation percentage of 25%-27%, the area reduction percentage of 67%-70%, the carbon equivalent less than or equal to 0.45% and the impact energy of 110J at -40 DEG C, has the advantages of high strength, good toughness, excellent low-temperature toughness and welding property especially, less alloy element addition, simple heat treatment process and lower cost and is especially suitable for manufacturing high-strength steel casting materials which have severe requirements on low-temperature toughness and welding.

Description

technical field [0001] The invention relates to the technical field of alloy material casting, in particular to a low-alloy high-strength cast steel for low temperature and a preparation method thereof. Background technique [0002] Cast steel has excellent mechanical and physical and chemical properties, and is widely used in mechanical manufacturing industries such as transportation, mining, petroleum, and metallurgy. In 2011 alone, China's annual steel casting output reached 11 million tons, an increase of 48%. It can be seen that the steel casting industry has huge development potential and economic benefits. Harsh use environment (low temperature, heavy load, impact, etc.) puts forward higher requirements on the performance of cast steel: while ensuring high strength, cast steel is also required to have good low temperature impact toughness and weldability. Traditional cast steel materials contain high carbon content (w(C) is 0.15% to 0.60%). High carbon content can im...

Claims

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Application Information

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IPC IPC(8): C22C38/46C22C33/06
Inventor 许晓嫦雷勇吴峰
Owner CENT SOUTH UNIV
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