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Treating method for improving steel toughness

A treatment method and steel technology, applied in the production of dual-phase steel products, can solve the problems of poor low-temperature impact toughness and failure to meet the use requirements, and achieve the effects of reducing plasticity and toughness, preventing precipitation, and reducing thermal stress

Inactive Publication Date: 2018-04-03
孙超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After heat treatment of steel products according to the conventional process, the strength can be guaranteed, but the low-temperature impact toughness is poor, which cannot meet the use requirements

Method used

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  • Treating method for improving steel toughness

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The treatment method to improve the toughness of steel is as follows:

[0018] 1) After the steel is forged, load the furnace under the condition that the furnace temperature is not higher than 350°C, and perform two preheating;

[0019] 2) The temperature of the first preheating is 600°C, the heating rate is 0<50°C / h, and the temperature is kept for 1h; the temperature of the second preheating is 830°C, the temperature is kept for 1h, and then solid solution treatment is carried out;

[0020] 3) The solid solution temperature is 1040°C, the holding time is 0.8 hours / 100mm, and then cooled;

[0021] 4) Put it into clean water with an initial temperature of less than 10°C, and keep it for 20 minutes at a cooling rate of 4 seconds / mm.

[0022] In the step 4), in order to control the temperature of the clear water, the clear water is continuously injected at a speed of 38 tons / hour.

Embodiment 2

[0024] The treatment method to improve the toughness of steel is as follows:

[0025] 1) After the steel is forged, load the furnace under the condition that the furnace temperature is not higher than 350°C, and perform two preheating;

[0026] 2) The temperature of the first preheating is 660°C, the heating rate is 0<50°C / h, and the temperature is kept for 3 hours; the temperature of the second preheating is 900°C, the temperature is kept for 3 hours, and then solid solution treatment is carried out;

[0027] 3) The solid solution temperature is 1080°C, the holding time is 1.3 hours / 100mm, and then cooled;

[0028] 4) Put it into clean water with an initial temperature of less than 10°C, and keep it for 20 minutes at a cooling rate of 6 seconds / mm.

[0029] In the step 4), in order to control the temperature of the clear water, the clear water is continuously injected at a speed of 40 tons / hour.

Embodiment 3

[0031] The treatment method to improve the toughness of steel is as follows:

[0032] 1) After the steel is forged, load the furnace under the condition that the furnace temperature is not higher than 350°C, and perform two preheating;

[0033] 2) The temperature for the first preheating is 630°C, the heating rate is 0<50°C / h, and the temperature is kept for 2 hours; the temperature for the second preheating is 870°C, the temperature is kept for 1 hour, and then solid solution treatment is performed;

[0034] 3) The solid solution temperature is 1060°C, the holding time is 1 hour / 100mm, and then cooled;

[0035] 4) Put it into clean water with an initial temperature of less than 10°C, and keep it for 20 minutes at a cooling rate of 5 s / mm.

[0036] In the step 4), in order to control the temperature of the clear water, the clear water is continuously injected at a speed of 39 tons / hour.

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Abstract

The invention belongs to the technical field of production of duplex stainless steel products used at low temperature, and in particular relates to a treatment method for improving the toughness of steel. 1) After the steel is forged, the furnace is charged at a furnace temperature not higher than 350°C and preheated twice. ; then solid solution treatment; then cooling, put into clear water with an initial temperature of less than 10°C, and keep it for 20 minutes at a cooling rate of 4-6 seconds / mm. The steel solution treatment process includes the following steps: ① heating, Control the heating rate, preheating temperature, solid solution temperature and holding time in the low temperature section to reduce thermal stress and obtain a better two-phase structure ratio; The precipitation will significantly reduce the plasticity and toughness of steel.

Description

technical field [0001] The invention belongs to the technical field of production of dual-phase steel products used at low temperatures, and in particular relates to a processing method for toughness of steel with high requirements on various performance indexes. Background technique [0002] For steel forging products used at low temperature, due to the low temperature of the working environment, the brittleness of the product material will increase during long-term use. If the original steel forging material has high strength and poor low temperature impact toughness, it will be in a very short Failure forms such as fracture occur due to excessive brittleness within a certain period of time, reducing the service life. In order for this type of product to work normally without premature failure, in addition to having good strength, it is also necessary to ensure good low-temperature impact toughness under use. After heat treatment of steel products according to the convent...

Claims

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Application Information

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IPC IPC(8): C21D6/00C22C38/02C22C38/04C22C38/44C22C38/58
CPCC21D6/005C21D6/008C22C38/001C22C38/02C22C38/04C22C38/44C22C38/58
Inventor 孙超
Owner 孙超
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