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High-pressure valve material and heat treatment method thereof

A heat treatment method and body material technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of low strength, poor processing performance and corrosion resistance, high strength, etc., to facilitate cutting, reduce hardness, and reduce production costs Effect

Inactive Publication Date: 2013-08-07
JIANGSU JINSHI CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary materials, good corrosion resistance, low strength; high strength, poor processing performance and corrosion resistance

Method used

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  • High-pressure valve material and heat treatment method thereof
  • High-pressure valve material and heat treatment method thereof
  • High-pressure valve material and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: produce F125 valve body according to the following steps:

[0020] (1) Casting valve body blank: the valve body material is selected according to the following components: C 0.12%, Si 0.30%, Mn 0.50%, Cr 2.00%, Mo 0.90%, Fe 96.18%; the valve body blank is cast according to the process requirements;

[0021] (2) Normalizing treatment of the valve body blank: preheat the valve body blank to 650±10°C and hold it for 65 minutes, then heat it to 950±10°C and hold it for 600 minutes, then take it out of the furnace and air cool it to room temperature;

[0022] (3) Quenching and tempering treatment: Quenching and tempering treatment is carried out on the valve body blank after normalizing treatment. Quenching and tempering treatment includes quenching and tempering. Heat to 950±10°C, quench and hold for 200 minutes, then take out the furnace for water cooling, keep the F125 valve body in water for 15 minutes, the water temperature before quenching should be ≤38°C...

Embodiment 2

[0023] Embodiment 2: produce F125 valve body according to the following steps:

[0024] (1) Cast valve body blank: The valve body material is selected according to the following components: C 0.135%, Si 0.40%, Mn 0.55%, P≤0.0125%, S≤0.0125%, Cr 2.25%, Mo 0.95%, Fe 95.69% ;According to the process requirements, the valve body blank is cast;

[0025] (2) Normalizing treatment of the valve body blank: preheat the valve body blank to 650±10°C and hold it for 65 minutes, then heat it to 950±10°C and hold it for 600 minutes, then take it out of the furnace and air cool it to room temperature;

[0026] (3) Quenching and tempering treatment: Quenching and tempering treatment is carried out on the valve body blank after normalizing treatment. Quenching and tempering treatment includes quenching and tempering. Heat to 950±10°C for quenching and hold for 200 minutes, then take out the furnace for water cooling, keep the F125 valve body in water for 18 minutes, the water temperature befo...

Embodiment 3

[0027] Embodiment 3: produce F125 valve body according to the following steps:

[0028] (1) Cast valve body blank: The valve body material is selected according to the following components: C 0.15%, Si 0.50%, Mn 0.60%, P0.025%, S0.025%, Cr 2.50%, Mo 1.00%, Fe 95.2% ;According to the process requirements, the valve body blank is cast;

[0029] (2) Normalizing treatment of the valve body blank: preheat the valve body blank to 650±10°C and hold it for 65 minutes, then heat it to 950±10°C and hold it for 600 minutes, then take it out of the furnace and air cool it to room temperature;

[0030] (3) Quenching and tempering treatment: Quenching and tempering treatment is carried out on the valve body blank after normalizing treatment. Quenching and tempering treatment includes quenching and tempering. Heat to 950±10°C for quenching and heat preservation for 200 minutes, then take out the furnace for water cooling, keep the F125 valve body in water for 20 minutes, the water temperatu...

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Abstract

The invention discloses a high-pressure valve material and a heat treatment method thereof. The high-pressure valve material comprises the following components in percentage by mass: 0.12-0.15% of C, 0.30-0.50% of Si, 0.50-0.60% of Mn, at most 0.025% of P, at most 0.025% of S, 2.00-2.50% of Cr, 0.90-1.00% of Mo and 95.2-96.18% of Fe. The heat treatment method comprises the following steps: casting a high-pressure valve material into a valve blank according to technological requirements; preheating the valve blank to 650+ / -10 DEG C, keeping the temperature for some time, heating to 950+ / -10 DEG C, keeping the temperature for some time, discharging, and cooling in air; and preheating the valve blank subjected to normalizing treatment to 650+ / -10 DEG C, keeping the temperature for some time, continuing heating to 950+ / -10 DEG C, quenching, keeping the temperature for some time, discharging, cooling with water, heating to 580+ / -10 DEG C in furnace for tempering, keeping the temperature for some time, discharging, and cooling in air. The heat treatment method has the advantage of simple technique, enhances the mechanical properties of the treated valve to 105 K, improves the safety of the product, and lowers the production cost of the product.

Description

technical field [0001] The invention belongs to the technical field of engineering materials, in particular to a heat treatment method for materials, specifically a high-pressure valve body material and a heat treatment method. Background technique [0002] Cr-Mo alloy steel is commonly used to make parts in petrochemical, natural gas, power machinery, steam turbine, boiler, and aviation industries. In addition to good processing performance and high temperature oxidation corrosion resistance, these parts also require sufficient strength and toughness according to different uses. Ordinary materials have good corrosion resistance but low strength; high strength has poor processability and corrosion resistance. In modern petrochemical and natural gas industries, in order to meet the requirements of special working environment and high-pressure transmission, higher requirements are put forward for the corrosion resistance and strength of materials. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21D9/00C21D1/25
Inventor 张建诚孙允龙范献兵
Owner JIANGSU JINSHI CASTING & FORGING
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