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Forging process method for refining austenitic stainless steel grains

A technology of austenitic stainless steel and process method, which is applied in the field of metal forging and can solve problems such as coarse grains

Inactive Publication Date: 2020-10-20
洛阳中重铸锻有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of coarse grains (grain size < 4 grades) of austenitic stainless steel forgings, and provide a forging process method for refining austenitic stainless steel grains, using wide anvil strong pressure deformation method + temperature control The narrow anvil uniform deformation method is used for multi-pass forging, which can obtain uniform and fine grains on the surface and inner layers of the forgings, ensuring that the grain size is ≥ 4 grades

Method used

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  • Forging process method for refining austenitic stainless steel grains
  • Forging process method for refining austenitic stainless steel grains
  • Forging process method for refining austenitic stainless steel grains

Examples

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Embodiment 1

[0028] A forging process method for refining austenitic stainless steel grains, comprising the following steps:

[0029] Step 1, heating the billet to be forged;

[0030] Step 2, preheating the tools used in the forging process before forging;

[0031] Step 3. Lightly press the heated billet in step 1 when chamfering, control the amount of reduction on one side, and chamfer at high temperature to ensure that the concave surface of the billet is deformed;

[0032] Step 4. Pre-draw the billet processed in step 3, lightly tap it twice with a small reduction, and increase the deformation after the plasticity is improved;

[0033] Step 5. Elongate the billet pre-drawn in step 4 using the wide anvil forced deformation method (WHF), and control the amount of anvil and reduction according to the operation requirements of the WHF method;

[0034] Step 6: Forging the billet processed in Step 5 using a temperature-controlled narrow anvil uniform deformation method to obtain a forging. ...

Embodiment 2

[0043] Taking a 316 stainless steel round shaft forging with a diameter of φ500mm and a length of 3200mm as an example to describe, the grain size is required to be ≥ 4 grades, and the forging process method described in the present invention is used for forging production. The specific implementation steps are as follows:

[0044] 1) 32T ingot type is selected for 316 stainless steel ingot, and the heating temperature range of the ingot is controlled. The initial forging temperature shall not exceed 1200°C, and the final forging temperature shall not be lower than 850°C. Strictly control the final forging temperature to avoid cracks.

[0045] 2) Billets are heated to control their temperature rise rate, and the temperature is raised in steps. After a period of heat preservation, the temperature is rapidly raised to the heat preservation temperature; After a period of time, the temperature is rapidly raised to the holding temperature;

[0046] 3) The tools need to be preheate...

Embodiment 3

[0053] The strong pressure with wide anvil in the present invention is beneficial for the inner layer of the forging to quickly and effectively press the internal pores and obtain a fine grain structure, but at the same time, the larger the width of the anvil, the greater the friction force on the surface of the forging, and the metal flow on the surface of the forging is subject to friction The greater the force resistance, the grain structure has not been fully deformed to refine. On the contrary, the smaller the anvil width is, the smaller the friction force is on the surface of the forging, and the metal flow on the surface of the forging is less affected by the friction force, and the grain structure It can be refined by more sufficient deformation. Therefore, the forging process method provided by the present invention is to use the wide anvil strong pressure deformation method + the temperature control narrow anvil uniform deformation method to carry out multi-pass forgi...

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Abstract

The invention provides a forging process method for refining austenitic stainless steel grains, which can solve the problem of coarse grain structures of a forged piece and improve the corrosion resistance of austenitic stainless steel. A wide anvil strong pressure deformation method and a temperature control narrow anvil uniform deformation method are provided according to the flow deformation situations of metals in different regions of the forged piece in the forging process. The method comprises the following steps of firstly, forging by adopting the wide-anvil strong-pressure deformationmethod, so that the inner layer of the forged piece is fully deformed; and then finishing subsequent forging according to the temperature control narrow anvil uniform deformation method, so that the surface layer of the forged piece is fully deformed. According to the operation steps and key points of the method, internal pores of the forged piece can be quickly laminated. Meanwhile, fine grain structures are achieved on the surface layer and the inner layer of the forged piece, and the grain size is larger than or equal to the fourth grade.

Description

technical field [0001] The invention belongs to the field of metal forging, and in particular relates to a forging process method for refining austenitic stainless steel grains. Background technique [0002] Due to its excellent corrosion resistance, austenitic stainless steel is widely used in parts in contact with corrosive media. Grain size is one of the important indicators that affect the corrosion resistance of austenitic stainless steel. The higher the grain size level, the finer the grain size, indicating the better corrosion resistance of the material, especially when used in high corrosion resistance For parts, the requirements for the grain size level of the material are higher (grain size ≥ 4). [0003] Since the matrix phase of austenitic stainless steel at room temperature and high temperature is austenite, the grains cannot be refined through the phase transformation principle of heat treatment, so austenitic stainless steel forgings can only be processed by ...

Claims

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Application Information

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IPC IPC(8): B21J5/06B21J1/06
CPCB21J1/06B21J5/06
Inventor 李昌义高伟郭彪郑三妹王行赵建国孙长波郭锐涛崔丽丽李岩郭卫东肜亮
Owner 洛阳中重铸锻有限责任公司
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