Preparation method of high-toughness cast steel material

A strong toughness, cast steel technology, applied in the alloy field, can solve the problems of poor fluidity of cast steel materials, and achieve low cost and good effect

Pending Publication Date: 2021-06-22
张玉琪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the strength of cast iron has been difficult to meet people's needs for equipment and devices in extreme working environments. Cast steel is an iron-based alloy used to produce castings that does not undergo eutectic transformation during solidification, and has higher strength. , but the fluidity of cast steel material is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method of a strong and tough cast steel material according to the present embodiment, the chemical composition of the cast steel material is calculated by weight percentage as follows:

[0050] C: 0.4;

[0051] S: 0.025;

[0052] Si: 0.28;

[0053] V: 0.004;

[0054] Mn: 1.12;

[0055] Cr:1.0;

[0056] Mo: 0.4;

[0057] P: 0.03;

[0058] Ni: 0.0020;

[0059] The balance is iron.

[0060] The impact energy of the alloy cast steel material in this embodiment is more than or equal to 30J;

[0061] The method comprises the steps of:

[0062] Step 1, smelting pig iron and steel materials to obtain molten steel;

[0063] Step 2, casting the molten steel described in step 1 to obtain castings;

[0064] Step 3, keeping the casting described in step 2 at 855° C. for 50 minutes;

[0065] Step 4, heat-preserve the casting after step 3 for 35 minutes at 660°C, then heat up to 855°C for 80 minutes;

[0066] Step 5. After step 4 is kept warm for 75 minutes,...

Embodiment 2

[0068] A preparation method of a strong and tough cast steel material according to the present embodiment, the chemical composition of the cast steel material is calculated by weight percentage as follows:

[0069] C: 0.3;

[0070] S: 0.03;

[0071] Si: 0.2;

[0072] V: 0.003;

[0073] Mn: 1.1;

[0074] Cr:0.9;

[0075] Mo: 0.3;

[0076] P: 0.02;

[0077] Ni: 0.0015;

[0078] The balance is iron.

[0079] The impact energy of the alloy cast steel material in this embodiment is more than or equal to 30J;

[0080] The method comprises the steps of:

[0081] Step 1, smelting pig iron and steel materials to obtain molten steel;

[0082] Step 2, casting the molten steel described in step 1 to obtain castings;

[0083] Step 3, keeping the casting described in step 2 at 850°C for 60 minutes;

[0084] Step 4, heat-preserve the casting after step 3 for 40 minutes at 650°C, and heat it up to 850°C for 90 minutes;

[0085] Step 5. After step 4 is kept warm for 40 minutes, th...

Embodiment 3

[0087] A preparation method of a strong and tough cast steel material according to the present embodiment, the chemical composition of the cast steel material is calculated by weight percentage as follows:

[0088] C: 0.5;

[0089] S: 0.02;

[0090] Si: 0.3;

[0091] V: 0.005;

[0092] Mn: 1.2;

[0093] Cr:1.1;

[0094] Mo: 0.5;

[0095] P: 0.04;

[0096] Ni: 0.0025;

[0097] The balance is iron.

[0098] The impact energy of the alloy cast steel material in this embodiment is more than or equal to 30J;

[0099] The method comprises the steps of:

[0100]Step 1, smelting pig iron and steel materials to obtain molten steel;

[0101] Step 2, casting the molten steel described in step 1 to obtain castings;

[0102] Step 3, keeping the casting described in step 2 at 860°C for 30 minutes;

[0103] Step 4, heat-preserve the casting after step 3 for 30 minutes at 680°C, then heat up to 860°C for 40 minutes;

[0104] Step 5. After step 4 is kept warm for 90 minutes, the c...

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PUM

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Abstract

The invention discloses a preparation method of a high-toughness cast steel material. The preparation method comprises the following steps that 1, pig iron and a steel material are smelted to obtain molten steel; 2, the molten steel obtained in the step 1 is casted to obtain a casting; 3, the casting obtained in the step 2 is subjected to heat preservation for 30 minutes - 60 minutes under the condition of 850 DEG C - 860 DEG C; 4, the casting subjected to heat preservation in the step 3 is subjected to heat preservation for 30 minutes - 40 minutes under the condition of 650 DEG C - 680 DEG C, the temperature is increased to 850 DEG C - 860 DEG C, and heat preservation is conducted for 40 minutes - 90 minutes; and 5, after the heat preservation is conducted for 40 minutes - 90 minutes in the step 4, heat preservation is conducted on the casting for 4 hours - 6 hours at the temperature of 600 DEG C - 620 DEG C, and the high-toughness cast steel material is obtained. The cast steel material prepared through the preparation method has impact energy greater than or equal to 30 J and has high toughness, the cast steel material is suitable for extreme climate working conditions, and is good in effect and low in cost.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a preparation method of a strong and ductile cast steel material. Background technique [0002] With the rapid development of my country's industry, the energy field, transportation and other industries have developed rapidly. In order to meet the requirements of products and services, the performance of cast steel materials needs new development and research. [0003] Types of castings include cast steel, cast iron. At present, the strength of cast iron has been difficult to meet people's needs for equipment and devices in extreme working environments. Cast steel is an iron-based alloy used to produce castings that does not undergo eutectic transformation during solidification, and has higher strength. , but the fluidity of cast steel material is poor. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/46C22C38/44C21D6/00
CPCC21D6/004C21D6/005C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 不公告发明人
Owner 张玉琪
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