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A clean graded quenching method for 0cr16ni5mo1 martensitic stainless steel

A technology of 0cr16ni5mo1 and martensitic stainless steel, applied in the field of heat treatment of steel materials, can solve the problems of difficult control of quenching medium conversion time, inapplicable quenching methods, and impracticability, and achieve good application prospects, eliminate adverse effects, and small residual stress Effect

Active Publication Date: 2021-12-28
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only suitable for large workpieces, and for workpieces with small size and complex shapes, such as stator blades made of 0Cr16Ni5Mo1 martensitic stainless steel, the cooling rate is too fast in the water cooling step, and the quenching medium switching time is difficult to grasp, which cannot be achieved in actual production. Realized, the quenching method of replacing oil with air and normal temperature water cannot be applied

Method used

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  • A clean graded quenching method for 0cr16ni5mo1 martensitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Heat treatment is carried out by using a block-shaped 0Cr16Ni5Mo1 martensitic stainless steel sample, which specifically includes the following steps:

[0024] Step 1: Raise the temperature of the empty quenching furnace to 1100°C. After the temperature is stable, put the sample into the furnace and keep it warm for 60 minutes;

[0025] Step 2: Take out the sample after heat preservation, put it into a hot water tank filled with 90°C hot water for quenching, and the stirring rate of the hot water tank is 5r / min;

[0026] Step 3: After the temperature of the workpiece is basically uniform, take it out of the hot water tank, put it into a cold water tank filled with a mixture of ice and water at 0-5°C to cool and keep it warm for 180 minutes.

[0027] Step 4: Take out the sample after cold treatment, put it back to room temperature and put it into a furnace heated to 580°C for tempering. The tempering time is 60 minutes, then take out the sample and cool it naturally in t...

Embodiment 2

[0037] A clean graded quenching method for 0Cr16Ni5Mo1 martensitic stainless steel, the method is as follows: the austenitized 0Cr16Ni5Mo1 martensitic stainless steel is first quenched into hot water for cooling, and after the internal temperature of the 0Cr16Ni5Mo1 martensitic stainless steel is uniform, then Cool in an ice-water mixture.

[0038] Wherein, the temperature of the hot water is 80°C, and the temperature of the ice-water mixture is 0°C. The time of cold treatment is 240min. After cold treatment, the 0Cr16Ni5Mo1 martensitic stainless steel was taken out and returned to room temperature in air.

[0039] Hot water is served in the hot water tank and the ice water mixture is served in the cold water tank. The hot water is selected from pure water with a boiling point of 100°C under standard atmospheric pressure, and the ice-water mixture is prepared by placing high polymer ice packs in water. The hot water tank is equipped with frequency conversion agitator, therm...

Embodiment 3

[0044] A clean graded quenching method for 0Cr16Ni5Mo1 martensitic stainless steel, the method is as follows: the austenitized 0Cr16Ni5Mo1 martensitic stainless steel is first quenched into hot water for cooling, and after the internal temperature of the 0Cr16Ni5Mo1 martensitic stainless steel is uniform, then Cool in an ice-water mixture.

[0045]Wherein, the temperature of the hot water is 100°C, and the temperature of the ice-water mixture is 5°C. The time of cold treatment is 120min. After cold treatment, the 0Cr16Ni5Mo1 martensitic stainless steel was taken out and returned to room temperature in air.

[0046] Hot water is served in the hot water tank and the ice water mixture is served in the cold water tank. The hot water is selected from pure water with a boiling point of 100°C under standard atmospheric pressure, and the ice-water mixture is prepared by placing high polymer ice packs in water. The hot water tank is equipped with frequency conversion agitator, therm...

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Abstract

The invention relates to a clean and graded quenching method for 0Cr16Ni5Mo1 martensitic stainless steel. The method is as follows: the austenitized 0Cr16Ni5Mo1 martensitic stainless steel is first quenched into hot water for cooling, and the internal temperature of the 0Cr16Ni5Mo1 martensitic stainless steel is uniform. Afterwards, place it in an ice-water mixture for cold treatment. Compared with the prior art, adopting the quenching method of the present invention, the strength and toughness and plasticity of the 0Cr16Ni5Mo1 martensitic stainless steel workpiece obtained by final thermal processing can meet the design requirements after tempering in the normal process, and the process flow is simple and the material cost is low; Parameters such as the temperature of the hot water tank, residence time, and stirring rate can effectively control the cooling speed of the workpiece. The residual stress of the workpiece after heat treatment is small, and it is not easy to crack; and there is no problem of fire or dense smoke during oil quenching, and the overall cleanliness and pollution. It has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of iron and steel materials, and relates to a clean and graded quenching method for 0Cr16Ni5Mo1 martensitic stainless steel. Background technique [0002] Quenching is an essential process in the heat treatment process of steel materials, and the quenching cooling rate has an important influence on the structure and properties of the workpiece. If the quenching cooling rate is too fast, the quenching stress of the workpiece will increase, and quenching cracks will appear; if the quenching cooling rate is too slow to reach the critical cooling rate, its performance will be affected. Therefore, the appropriate quenching method must be selected according to the composition of the steel and the actual shape of the workpiece. [0003] 0Cr16Ni5Mo1 martensitic stainless steel has high strength, hardness and wear resistance, and is widely used in industries such as hydropower, thermal power, nucle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/19C21D6/00C21D6/04C22C38/00C22C38/02C22C38/04C22C38/42C22C38/44
CPCC21D1/19C21D6/004C21D6/005C21D6/008C21D6/04C22C38/44C22C38/02C22C38/04C22C38/42C22C38/008C21D2211/008
Inventor 宋逸思李传维李克罗俊鹏顾剑锋
Owner SHANGHAI JIAO TONG UNIV
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