High-strength ZG40Mn2 material heat treatment method

A heat treatment method, zg40mn2 technology, applied in the field of heat treatment, can solve the problems of product quenching cracking, deformation, cracking of steel castings, etc.

Inactive Publication Date: 2017-03-15
遵义金业机械铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because the hardenability of this material is good, it is easy to cause quenching cracking and deformation of the product during the heat treatment process.
This kind of castings are all used in the state after quenching and tempering treatment, and belong to medium carbon quenched and tempered manganese steel. The strength, plasticity and wear resistance of steel castings are high. The hardened diameter reaches 20-42mm, but there is temper brittleness and overheating sensitivity, and it is easy to cause cracking of steel castings during quenching

Method used

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  • High-strength ZG40Mn2 material heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A heat treatment method for high-strength ZG40Mn2 material, comprising the following steps:

[0017] Step 1: Put the ZG40Mn2 material into the DRZ-100C model 75KW well-type furnace to preheat to 670°C and keep it warm for 50min;

[0018] Step 2: On the basis of Step 1, continue to reheat to 800°C in a 75KW well-type furnace of the DRZ-100C model, and keep it warm for 70 minutes to obtain the primary ZG40Mn2 material;

[0019] Step 3: Then put the primary ZG40Mn2 material into a 7% quenching solution with an oil temperature of 30°C for quenching to obtain an intermediate ZG40Mn2 material;

[0020] Step 4: Take the intermediate ZG40Mn2 material out of the quenching liquid, place it in the air for cooling, and then send it to the RT3-260-18 trolley-type resistance furnace for heating to 530°C, keep it warm for 110 minutes, and then air-cool it High-temperature tempering at room temperature to obtain high-strength ZG40Mn2 material.

Embodiment 2

[0022] A heat treatment method for high-strength ZG40Mn2 material, comprising the following steps:

[0023] Step 1: Put the ZG40Mn2 material into the DRZ-100C 75KW well-type furnace to preheat to 690°C and keep it warm for 60 minutes;

[0024] Step 2: On the basis of Step 1, continue to reheat to 820°C in a 75KW well-type furnace of the DRZ-100C model, and keep it warm for 80 minutes to obtain the primary ZG40Mn2 material;

[0025] Step 3: Then put the primary ZG40Mn2 material into an 8% quenching solution with an oil temperature of 50°C for quenching to obtain an intermediate ZG40Mn2 material;

[0026] Step 4: Take the intermediate ZG40Mn2 material out of the quenching liquid, place it in the air for cooling, and then send it to the RT3-260-18 trolley-type resistance furnace for heating to 570°C, keep it warm for 120 minutes, and then air-cool it High-temperature tempering at room temperature to obtain high-strength ZG40Mn2 material.

Embodiment 3

[0028] A heat treatment method for high-strength ZG40Mn2 material, comprising the following steps:

[0029] Step 1: Put the ZG40Mn2 material into a 75KW well-type furnace of the DRZ-100C model to preheat to 710°C and keep it warm for 70 minutes;

[0030] Step 2: On the basis of Step 1, continue to reheat to 840°C in a 75KW well-type furnace of the DRZ-100C model, and keep it warm for 90 minutes to obtain the primary ZG40Mn2 material;

[0031] Step 3: Then put the primary ZG40Mn2 material into a 9% quenching solution with an oil temperature of 70°C for quenching to obtain an intermediate ZG40Mn2 material;

[0032] Step 4: Take the intermediate ZG40Mn2 material out of the quenching liquid, place it in the air for cooling, and then send it to the RT3-260-18 trolley-type resistance furnace for heating to 590°C, keep it warm for 130 minutes, and then air-cool it High-temperature tempering at room temperature to obtain high-strength ZG40Mn2 material.

[0033] After using this sche...

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Abstract

The invention discloses a high-strength ZG40Mn2 material heat treatment method, and relates to the field of heat treatment. The high-strength ZG40Mn2 material heat treatment method comprises the following steps: 1, putting a ZG40Mn2 material in a vertical pit furnace for preheating to 670-710 DEG C, and carrying out heat preservation for 50-70 min; 2, reheating the material to 800-840 DEG C based on the step 1, and carrying out heat preservation for 70-90 min to obtain a primary ZG40Mn2 material; 3, putting the primary ZG40Mn2 material in a quenching liquid of which the oil temperature is 30-70 DEG C for quenching so as to obtain an intermediate ZG40Mn2 material; and 4, taking the intermediate ZG40Mn2 material out of the quenching liquid, putting the intermediate ZG40Mn2 material in the air for cooling, putting the intermediate ZG40Mn2 material which is cooled to room temperature in a bogie-hearth resistance furnace for heating to 530-590 DEG C, air-cooling to room temperature after carrying out heat preservation for 110-130 min, and carrying out high-temperature tempering to obtain the high-strength ZG40Mn2 material.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a heat treatment method for high-strength ZG40Mn2 material. Background technique [0002] The high-strength special ZG40Mn2 material is mainly used in the aerospace field such as some parts of the steering wheel set of a certain type of special heavy-duty vehicle. Its mechanical properties are: tensile strength σb≥885MPa, yield strength σS≥735MPa. large shock loads. In this kind of working environment for a long time, if only improving the strength but not enough ductility and plasticity, the material will often undergo brittle fracture due to crack instability and propagation when the load stress is far lower than the yield strength of the steel. [0003] ZG40Mn2 is a kind of cast steel. The ZG40Mn2 material belongs to high-strength steel. It is characterized by high strength, good hardenability, toughness and weldability, and has a high fatigue limit and multiple impact resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00
CPCC21D1/18C21D6/005
Inventor 苏黎徐小静刘文东
Owner 遵义金业机械铸造有限公司
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