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Low-temperature impact-resistant nodular cast iron material and casting method thereof

A nodular cast iron, impact-resistant technology, applied in the field of nodular cast iron material casting, can solve problems such as complex production processes, and achieve the effect of reducing production costs

Inactive Publication Date: 2018-11-13
YICHANG MARINE DIESEL ENGINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general production process of QT350-22AL materials requires strict control of other trace elements (such as V, Ti, Cr) and the addition of alloying elements such as Ni and Mo. The production process is complicated

Method used

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  • Low-temperature impact-resistant nodular cast iron material and casting method thereof
  • Low-temperature impact-resistant nodular cast iron material and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a casting method of low-temperature impact-resistant nodular cast iron material, comprising the following steps:

[0024] 1. Molding: Molding is made with molding sand and core sand as molding materials. In this embodiment, the trial-manufactured part is a medium-plate casting with a pouring weight of about 1600Kg and a wall thickness of 80 to 220mm. It is thick ductile iron. Place 4 70mm thick Y-shaped ductile iron standard test blocks for each casting, and 3 pieces for molding, and the molding is carried out according to the process standard.

[0025] The mold is preheated with hot air. The preheating time is 24-36 hours, and the cavity temperature reaches 40-80°C, so as to prevent casting defects and affect the test performance of castings due to excessive gas generation in the cavity during pouring and filling.

[0026] 2. Smelting: Add low-silicon pig iron and scrap steel as smelting raw materials and carburizer to an intermediate frequency induction ...

Embodiment 2

[0037] Example 2: Different from Example 1, before the spheroidization treatment, the composition in the furnace is controlled as follows: C 3.85-3.9%, Si 0.55-0.6%, Mn<0.4%, P<0.04%, S<0.03%, The balance is Fe.

[0038] After the inoculation with flow in Step 5 is completed, the composition of molten iron is controlled as follows: C 3.85-3.9%, Si 1.95-2.0%, Mn<0.4%, P<0.04%, S<0.03%, and the balance is Fe.

[0039] The mechanical property test data in this embodiment is as follows table:

[0040]

[0041] It can be seen from the test results that the mechanical properties of the ductile graphite castings cast by the present invention meet the requirements of mechanical properties. Under the low temperature condition of -40°C, the impact performance Akv is greater than 10J, which meets the requirements of wind power materials for low temperature impact resistance.

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Abstract

The invention provides a low-temperature impact-resistant nodular cast iron material and a casting method thereof. The material comprises, by weight, 3.6-3.9% of C, 1.6-2% of Si, 0-0.4% of Mn, 0-0.04%of P, 0-0.03% of S and the balance Fe. According to the casting method, the content of Si and Mn is controlled, a nodulizing agent is used for nodulizing, and a batch inoculation production method isutilized, so that the low-temperature impact stability can reach 10 J or above which is required by standards at the temperature of -40 DEG C or below, the product performance is stable, and the casting process is simple and easy to control.

Description

technical field [0001] The invention relates to the field of casting of ductile iron materials, in particular to a low-temperature impact-resistant nodular cast iron material and a casting method thereof. Background technique [0002] The use of ductile iron as a wind power material requires low-temperature impact resistance. QT350-22AL is the best choice for wind power materials because of its excellent impact resistance at -40°C. At present, the general production process of QT350-22AL materials needs to strictly control other trace elements (such as V, Ti, Cr) and add alloy elements such as Ni and Mo, which makes the production process complicated. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a low-temperature impact-resistant nodular cast iron material and its casting method. The low-temperature impact energy of the material at -40°C can reach more than 10J, which meets the requirements of GB / T1348-2009. T...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08
CPCC22C33/08C22C37/04C22C37/10
Inventor 邓小洲万品军郝博魁冯德弋
Owner YICHANG MARINE DIESEL ENGINE
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