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High-hardness alloy steel for door frame and preparation method thereof

A technology of high-hardness alloy steel and alloy steel, which is applied in the field of alloy steel, and can solve problems that affect the appearance and use, and the surface is prone to wear, corrosion, strength, hardness, toughness and other mechanical and mechanical performance defects.

Inactive Publication Date: 2017-02-01
ANHUI KATA DOOR & WINDOW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the currently commercially available alloy steel for door frames is prone to wear and corrosion on its surface during use, and its mechanical properties such as strength, hardness, and toughness also have defects, which affect its appearance and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Wash the alloy steel with water, then perform anaerobic calcination at a temperature of 235°C for 5h, and then place it in sodium lauryl sulfate with a concentration of 30g / L for 35s of activation treatment;

[0021] (2) Heat the alloy steel after activation treatment from 20°C to 520°C at a heating rate of 10°C / min, and keep it at 520°C for 110 minutes to perform the first heating heat treatment; then from 520°C at 20°C / min Raise the temperature to 700°C at a heating rate of min, and keep it at 700°C for 60 minutes to perform the heat treatment of the second heating;

[0022] (3) Quenching the heat-treated alloy steel with a PAG quenching agent with a volume concentration of 6%, then heating at 500°C for 100min, then water-cooling to 125°C, then naturally cooling to 18°C, and finally placing In a magnesium chloride solution with a volume concentration of 18g / L, the high-hardness alloy steel A1 for the door frame is obtained;

[0023] Wherein, in parts by weight, t...

Embodiment 2

[0025] (1) The alloy steel is washed with water, followed by anaerobic calcination at a temperature of 295°C for 6h, and then placed in sodium lauryl sulfate with a concentration of 40g / L for 50s of activation treatment;

[0026] (2) Heat the alloy steel after activation treatment from 25°C to 540°C at a heating rate of 15°C / min, and keep it at 540°C for 130 minutes to perform the first heating heat treatment; then from 540°C at 25°C / min Raise the temperature to 720°C at a heating rate of min, and keep it at 720°C for 80 minutes to perform the heat treatment of the second heating;

[0027] (3) Quenching the heat-treated alloy steel with a PAG quenching agent with a volume concentration of 10%, then heating at 520°C for 120min, then water-cooling to 150°C, then naturally cooling to 25°C, and finally placing In the magnesium chloride solution that the volume concentration is 22g / L to make the high-hardness alloy steel A2 for the door frame;

[0028] Wherein, in parts by weight,...

Embodiment 3

[0030] (1) Wash the alloy steel with water and alcohol, then perform anaerobic calcination at a temperature of 260°C for 5.5h, and then place it in sodium lauryl sulfate with a concentration of 35g / L for 40s of activation treatment;

[0031] (2) Heat the alloy steel after activation treatment from 23°C to 530°C at a heating rate of 13°C / min, and keep it at 530°C for 120 minutes to perform the first heating heat treatment; then from 530°C at 20°C / min Raise the temperature to 710°C at a heating rate of min, and keep it at 710°C for 70 minutes to perform the heat treatment of the second heating;

[0032] (3) Quenching the heat-treated alloy steel with a PAG quenching agent with a volume concentration of 8%, then heating at 510°C for 110min, then water-cooling to 135°C, then naturally cooling to 22°C, and finally placing In a magnesium chloride solution with a volume concentration of 20g / L to obtain a high-hardness alloy steel A3 for door frames;

[0033] Wherein, in parts by wei...

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Abstract

The invention discloses high-hardness alloy steel for a door frame and a preparation method thereof. The method comprises the steps of (1) carrying out water washing and oxygen-free calcination on the alloy steel, and then putting the alloy steel in sldium lauryl sulfate to be subjected to activating treatment; (2) carrying out thermal treatment of primary heating and secondary heating on the alloy steel; and (3) carrying out quenching, heating and cooling on the alloy steel subjected to thermal treatment, and then, putting the alloy steel into a magnesium chloride solution, so as to prepare the high-hardness alloy steel for the door frame, wherein the alloy steel comprises the following elements by weight percent: 0.65 to 0.85% of C, 0.15 to 0.35% of Si, 0.20 to 0.30% of Mn, 0.3 to 0.55% of Mo, 0.15 to 0.4% of Mg and 0.05 to 0.15% of Ge, and the balance being Fe; the primary heating comprises the steps of increasing the temperature from 20 to 25 DEG C to 520 to 540 DEG C at the temperature increase speed of 10 to 15 DEG C / min, and keeping the temperature at 520 to 540 DEG C for 110 to 130 min; and the secondary heating comprises the steps of increasing the temperature from 520 to 540 DEG C to 700 to 720 DEG C at the temperature increase speed of 20 to 25 DEG C / min, and keeping the temperature at 700 to 720 DEG C for 60 to 80 min. According to the invention, the door frame manufactured through the method has excellent mechanical properties like high strength and high hardness.

Description

technical field [0001] The invention relates to alloy steel, in particular to high-hardness alloy steel for door frames and a preparation method thereof. Background technique [0002] The door frame is an important part of the building envelope structure system. According to its constituent materials, the common door frames include wooden door frames, glass door frames, aluminum alloy door frames and alloy steel door frames. The wooden door frame is flammable, easy to deform, difficult to repair after being damaged, easy to crack, scar, poor corrosion resistance, susceptible to insects, etc., and prone to mildew when it is damp. Glass door frames are fragile, which limits their applications. The aluminum alloy door frame is easily deformed, and aluminum is a high energy consumption product. Alloy steel door frame has the characteristics of high strength, easy processing, low cost, low operation and management costs, and low price, so it is widely used in door frames. [0...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D1/18C23G1/24C23C22/68
CPCC22C38/02C21D1/18C22C38/002C22C38/04C22C38/12C23C22/68C23G1/24
Inventor 洪长林
Owner ANHUI KATA DOOR & WINDOW
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