High-strength and high-toughness low-alloy cast steel and preparation method thereof

A low-alloy cast steel, high-strength and toughness technology, applied in the field of cast steel materials, to achieve the effects of fine grain refinement, inhibition of growth, and improvement of toughness and plasticity

Active Publication Date: 2022-02-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

), although the tensile strength has reached 1200MPa, there are still some deficiencies

Method used

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  • High-strength and high-toughness low-alloy cast steel and preparation method thereof
  • High-strength and high-toughness low-alloy cast steel and preparation method thereof
  • High-strength and high-toughness low-alloy cast steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a high-strength toughness low-alloy cast steel and its manufacturing method. Its components and their mass percentages are: 0.22%C, 0.7%Si, 0.77%Mn, 1.05%Cr, 0.57%Mo, 0.54% %Ni, 0.05%V, 0.03%Nb, 0.02%Ti, 0.03%Cu, 0.004%P, 0.008%S, and the balance is Fe. (S and P originate from industrial pure iron containing trace amounts of S and P elements)

[0024] Preparation process: The mold is reserved at 200°C for 30 minutes, put into the vacuum melting furnace, and the raw materials are prepared according to the composition. The raw materials selected for this experiment are shown in Table 1, where the meaning of purity is: the content of the target element.

[0025] Table 1. Alloy type and purity

[0026]

[0027] Casting mold is 70kg, according to the composition of design, carry out batching, in embodiment 1, the quality of every kind of raw material is as shown in table 2:

[0028] Table 2. Alloy type and quality

[0029]

[0030] Melting p...

Embodiment 2

[0036] This embodiment provides a high-strength toughness low-alloy cast steel and its manufacturing method. Its components and their mass percentages are: 0.21% C, 0.52% Si, 0.72% Mn, 0.70% Cr, 0.53% Mo, 0.60 %Ni, 0.05% V, 0.02% Nb, 0.02% Ti, 0.02% Al, 0.03% Cu, the balance being Fe. 0.005% S, 0.007% P.

[0037] The manufacturing method is basically the same as in Example 1. The performance test of the prepared high-strength toughness low-alloy cast steel shows that the tensile strength is 1262MPa, the yield strength is 1162MPa, the elongation is 14.67%, the elongation after fracture is 35.00%, and the impact energy is 52J.

Embodiment 3

[0039]This embodiment provides a high-strength toughness low-alloy cast steel and its manufacturing method. Its components and their mass percentages are: 0.17%C, 0.50%Si, 0.86%Mn, 0.71%Cr, 0.67%Mo, 0.52% %Ni, 0.05% V, 0.03% Nb, 0.02% Ti, 0.01% Al, 0.03% Cu, the balance being Fe. 0.007% S, 0.004% P.

[0040] The manufacturing method is basically the same as in Example 1. The performance test of the prepared high-strength toughness low-alloy cast steel shows that the tensile strength is 1210MPa, the yield strength is 1121MPa, the elongation is 14.78%, the elongation after fracture is 37.56%, and the impact energy is 50J.

[0041] After heat treatment, such as figure 1 It is the metallographic image enlarged 500 times of Example 1, and the structure is tempered sorbite structure. In the process of austenitization, due to the addition of Nb, V, Ti and other alloying elements in the alloy composition, it plays a role in refining the austenite grains. At the same time, during th...

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Abstract

The invention relates to high-strength and high-toughness low-alloy cast steel and a preparation method thereof. The cast steel comprises the following components in percentage by mass: 0.1%-0.3% of C, 0.4%-0.8% of Si, 0.6%-0.85% of Mn, 0.6%-1.2% of Cr, 0.3%-0.7% of Mo, 0.5%-1% of Ni, 0.02%-0.08% of V, 0.02%-0.08% of Nb, 0.02%-0.08% of Ti, 0.01%-0.05% of Cu, less than or equal to 0.01% of S, less than or equal to 0.01% of P and the balance of Fe. The obtained material is excellent in comprehensive mechanical property, easy to cast and mold and simple in process, and is cast steel with high strength, high toughness and high plasticity.

Description

technical field [0001] The invention belongs to the technical field of cast steel materials, and relates to a low alloy cast steel with high strength and toughness. Background technique [0002] Low-alloy high-strength toughness cast steel is a type of steel developed on the basis of cast carbon steel by adding a small amount of alloying elements and through appropriate heat treatment to increase strength and toughness and improve its mechanical properties. Because of its excellent mechanical and physical and chemical properties, it is widely used in mechanical manufacturing industries such as transportation, mining, petroleum, metallurgy, and shipbuilding. [0003] In the past 30 years, high-strength toughness low-alloy cast steel has developed rapidly with the advancement of melting and casting technology. Due to the application of cast steel materials in harsh environments (heavy loads, impacts, etc.), further research has been put forward on the mechanical properties of ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D1/25C21D1/28C21D6/00C22C33/06
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/42C22C33/06C21D1/28C21D6/004C21D6/005C21D6/008C21D1/25
Inventor 赵维民董立山
Owner HEBEI UNIV OF TECH
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