Why do stainless steel forgings need to be work hardened?

I am the master of Yongxinsheng Forging Factory, I think.

1. Work hardening is conducive to the deformation uniformity of plastic deformation processing of stainless steel forgings. Because when the first deformed part of the stainless steel forging is strengthened, the continuous deformation will mainly develop in the final deformed part, so that the stainless steel material can be uniformly deformed, such as the drawing of the barrel forging;

2. It can ensure the working safety of metal parts and components. For example, once the part is overloaded and other reasons in the work, the stress of a certain part of the part is greater than its yield point and a small amount of plastic deformation, then the yield point of the part is increased due to work hardening, and it is possible to prevent further deformation and fracture of the part.

In order to increase its hardness. One is that stainless steel is too soft, and removing too much carbon from it makes it hard and good for life.

Generally speaking, forging will increase the hardness and strength of stainless steel, but it will also reduce its plasticity and toughness, making it difficult to change the degree of orange. Therefore, for the processing of stainless steel, it is very important to select a stainless steel material that is easy to process. At present, the widely used stainless steel materials in the market include etc., among which 304 and 316 are one of the commonly used materials.

The two materials have good mechanical properties and are easy to machine, drill, polish and cut. This is mainly due to the fact that the two materials are relatively homogeneous in composition, have a low carbon content, and have good plasticity and toughness. In addition, the choice of different processing methods will also affect the difficulty of stainless steel processing.

For example, sheet metal processing is relatively easy, and methods such as cutting, bending, etc. can be used; Bar machining, on the other hand, is more difficult and requires the use of methods such as rotary cutting or milling. Therefore, when choosing stainless steel materials, it is necessary to consider the difficulty of processing, as well as the processing methods and processes used, so as to select suitable materials that are easy to process.

There are many methods and classifications for the forming of stainless steel forgings, among which the main methods of forging forming are open forging and die forging.

First, open forging is a simple and flexible metal forming method, although for small and medium-sized forgings in batches or mass production, open forging is recognized as an outdated and uneconomical forging forming method, but for small batch or unit production, especially for large stainless steel forgings, free forging on a hammer or hydraulic press is still a suitable and economical production method.

Second, die forging is the main process of forging forming, and the equipment used mainly includes die forging hammers, anvilless hammers, crank presses, screw presses and high-speed hammers. Yongxinsheng die forging has high productivity, stable forging size and high material utilization, so it is widely used in batch and mass production of stainless steel forgings. It is estimated that the number of die forgings is large, accounting for about 90% of the total weight of forgings.

I'm the master of Yongxinsheng Forging Factory, I think.

1. Work hardening is conducive to the deformation uniformity of plastic deformation processing of stainless steel forgings. Because when the first deformed part of the stainless steel forging is strengthened, the continuous deformation will mainly develop in the final deformed part, so that the stainless steel material can be uniformly deformed, such as the drawing of the cylindrical rough forging;

2. It can ensure the working safety of metal parts and components. For example, once the part is overloaded in the work, and the stress of a certain part of the part is greater than its yield point, resulting in a small amount of plastic deformation, the yield point of the part will be increased due to work hardening, and it is possible to prevent further deformation and fracture of the part.

The purpose of work hardening is to increase its strength and hardness, and this is the purpose of machining.

In the forming process of stainless steel forgings, the surface may be stuck with oil, burrs, rough surface and oxides, so before the surface treatment, the oil, burrs, uneven surface and oxides must be removed, so that the subsequent addition can obtain the full competition effect.

Pretreatment is an important treatment step for the surface of stainless steel forgings before entering the surface treatment (including pickling, chemical polishing and electrochemical polishing, electroplating, passivation, blacking, coloring, chemical processing, etc.).

I am the master of Yongxinsheng Forging Factory, and I think there are the following problems.

1.Weld defects: The weld defects are more serious, and the manual mechanical grinding method is used to make up for the grinding marks, resulting in uneven surface and affecting the appearance.

2.Inconsistent surface: only pickling and passivating the weld also causes uneven surface and affects the appearance.

3.Scratches are difficult to remove: the overall pickling passivation cannot remove all kinds of scratches generated in the processing process, and it cannot remove the carbon steel, spatter and other impurities that adhere to the surface of stainless steel due to scratches and welding spatter, resulting in chemical corrosion or electrochemical corrosion and rust in the presence of corrosive medium.

4.Uneven grinding and polishing passivation: pickling and passivation treatment is carried out after manual grinding and polishing, and it is difficult to achieve a uniform and consistent treatment effect for the workpiece with a large area, and the ideal uniform surface cannot be obtained. And the cost of man-hours and auxiliary materials is also high.

5.Limited pickling capacity: Pickling passivation paste is not a panacea, and it is difficult to remove plasma cutting, flame cutting and black oxide scale.

6.Scratches caused by human factors are more serious: in the process of hoisting, transportation and structural processing, scratches caused by human factors such as bumps, dragging, and hammering are more serious, which makes surface treatment more difficult, and is also the main reason for rust after treatment.

7.Equipment factors: In the process of bending and bending profiles and plates, scratches and creases caused by them are also the main causes of rust after treatment.

8.Other factors: In the process of procurement and storage of stainless steel raw materials, the bumps and scratches caused by the hoisting and transportation process are also relatively serious, which is also one of the reasons for corrosion.

Stainless steel forgings are widely used in the industrial field, and also have different shapes, which can be simple or complex, the key is that the specific production process is very rigorous, and the advantages reflected are naturally very obvious. This kind of exercise has a very specific classification, consumers need to understand it in time when buying, if you buy a product that does not meet your own requirements, and then replace it, it will be very troublesome, and it may cause some trouble to the seller and yourself, so timely consult the seller in the process of buying the classification, take a look at your own situation, what kind of type you need to buy will be easier, and it is not easy to have disputes and problems.

What is the specific classification of stainless steel forgings? First of all, this kind of product can be divided into different types according to the movement of the entire processed material, the most common are open forging and die forging. The former is mainly to use the impact force generated by the artificial machine, or the greater pressure, so that the stainless steel metal material between the two anvils, the shape of the change, so that you can get the required parts, of course, it can also be divided into the use of artificial machines according to the scale and requirements of different enterprises, as well as the use of artificial machines.

The latter is mainly through the open and closed forging method, so that some stainless steel materials in a certain mold to change their own shape.

Secondly, stainless steel forgings can also be divided into three categories according to the role of temperature, the most common of which is hot forging and cold forging, and the middle is warm forging. These methods can be selected according to the different requirements of related industries, and sometimes they may be combined in two ways, so as to play a more accurate role, so that stainless steel materials can be changed in various shapes according to certain specifications and standards, as long as they can be further improved, these methods can be used for forging.

This product is forged from stainless steel as a forging raw material.