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Alloy materials for casting and the process of using them to cast large gearboxes for offshore platforms

An offshore platform and casting alloy technology, which is applied in the field of alloy materials for casting and the casting of large gearboxes on offshore platforms, can solve the problems of uneven cooling degree, poor metal liquid filling, and low genuine casting rate, and achieve flow Good performance, high yield and reasonable formula

Active Publication Date: 2016-12-07
CHANGSHU HONGQIAO CAST STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the complex structure and shape of the large gear box on the offshore platform and the large difference in wall thickness, the cooling degree of each part of the casting during the casting process is uneven, and shrinkage porosity and shrinkage cavity are easily generated in the thick wall part, and in the thin wall part It is also prone to poor filling of molten metal, so it is easy to cause fatal defects such as cracks, pores and sand holes in the casting process, which makes the authenticity rate of castings low; at the same time, in order to eliminate casting stress and improve the dimensional accuracy and internal quality of castings, the heat treatment process is also very important. The essential

Method used

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  • Alloy materials for casting and the process of using them to cast large gearboxes for offshore platforms
  • Alloy materials for casting and the process of using them to cast large gearboxes for offshore platforms

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The ZG32CrNiMo alloy material used for casting large gear box castings on offshore platforms is prepared, and its composition and mass ratio are: C: 0.26%, Si: 0.40%, Mn: 0.90%, Cr: 0.50%, Ni: 0.80%, Mo: 0.30%, P: 0.015%, S: 0.02%, Fe: 96.805%.

[0036] The ZG32CrNiMo alloy material prepared above is used to cast offshore platform large gearbox castings. The casting and heat treatment process includes the following steps:

[0037] A, the ZG32CrNiMo alloy material that above-mentioned preparation obtains is smelted into molten metal;

[0038] b. Carry out resin sand molding according to the above method, set up bottom pouring pouring system, open riser and forming cold iron, pour 1200kg of molten metal, and the pouring temperature is 1550°C. After pouring, the casting is kept in the sand mold for 48 hours, and then the sand is cleaned And gas-cut riser, the temperature of the gas-cut riser is 150 ℃, and the gross weight of the large gearbox casting of the offshore platfor...

Embodiment 2

[0042] The ZG32CrNiMo alloy material used for casting large gear box castings on offshore platforms is prepared, and its composition and mass ratio are: C: 0.35%, Si: 0.20%, Mn: 1.00%, Cr: 0.80%, Ni: 0.70%, Mo: 0.38%, P: 0.01%, S: 0.01%, Fe: 96.55%.

[0043] The ZG32CrNiMo alloy material prepared above is used to cast offshore platform large gearbox castings. The casting and heat treatment process includes the following steps:

[0044] A, the ZG32CrNiMo alloy material that above-mentioned preparation obtains is smelted into molten metal;

[0045] b. Carry out resin sand molding according to the above method, set up bottom pouring pouring system, open riser and forming cold iron, pour 1200kg of molten metal, and the pouring temperature is 1540°C. After pouring, the casting is kept in the sand mold for 48 hours, and then the sand is cleaned And gas-cut riser, the temperature of gas-cut riser is 160 ℃, and the gross weight of the large gearbox casting of offshore platform is 800...

Embodiment 3

[0049] The ZG32CrNiMo alloy material used for casting large gearboxes of offshore platforms is formulated, and its composition and mass ratio are: C: 0.32%, Si: 0.40%, Mn: 0.90%, Cr: 0.70%, Ni: 0.70%, Mo: 0.34%, P: 0.025%, S: 0.01%, Fe: 96.605%.

[0050] The ZG32CrNiMo alloy material prepared above is used to cast offshore platform large gearbox castings. The casting and heat treatment process includes the following steps:

[0051] A, the ZG32CrNiMo alloy material that above-mentioned preparation obtains is smelted into molten metal;

[0052] b. Carry out resin sand molding according to the above method, set up bottom pouring pouring system, open riser and forming cold iron, pour 1200kg of molten metal, and the pouring temperature is 1560°C. After pouring, the casting is kept in the sand mold for 48 hours, and then the sand is cleaned And gas-cut riser, the temperature of gas-cut riser is 160 ℃, and the gross weight of the large gearbox casting of offshore platform is 800kg; ...

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Abstract

The invention discloses an alloy material for casting and a technology of casting a large gearbox casting of an offshore platform by using the alloy material. The alloy material is ZG32CrNiMo. The technology of casting the large gearbox casting of the offshore platform by using the ZG32CrNiMo comprises the following steps: a, resin sand modeling; b, gating system, riser and chill block arrangement; c, liquid metal gating; d, normalizing and tempering pretreatment; and e, quenching and tempering thermal treatment. Due to the adoption of the mode, the formula of the ZG32CrNiMo alloy material is reasonable; particularly, the smelted liquid metal has the characteristic of good mobility, so that the casting in a casting state has good tensile strength and good ductility; meanwhile, the technology of casting a casting of a large-size bearing shell by using the ZG32CrNiMo is reasonable; by reasonably arranging a bottom gating type gating system, a riser and a chill block, the gated casting does not have a crack and is high in the yield.

Description

technical field [0001] The invention relates to the technical field of metal casting, in particular to an alloy material for casting and a process for casting a large gear box casting of an offshore platform using the alloy material. Background technique [0002] The shrinkage rate of shell castings is affected by many factors such as the chemical composition of the molten metal smelted from the casting alloy material, the pouring temperature, the structural characteristics of the casting itself, the concession of the mold and the concession of the core, etc., especially the metal The influence of the chemical composition of the liquid and the pouring temperature makes the size of the same casting vary in each heat or even the same heat. [0003] The casting of the large gearbox on the offshore platform weighs 800kg, and the mechanical properties are required to reach: yield strength ≥ 600MPa, tensile strength ≥ 740MPa, elongation ≥ 17%, reduction of area ≥ 35%, -40 impact v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44B22C9/22B22C9/08B22D27/04C21D6/00C21D9/00
Inventor 陈学忠张明均
Owner CHANGSHU HONGQIAO CAST STEEL CO LTD