Industry News

Do you know the four fires of heat treatment in forging technology?

Forgings in the forging process, heat treatment is the most important link, heat treatment roughly annealing, normalizing, quenching and tempering four basic processes, commonly known as metal heat treatment of the "four fire". one, metal heat treatment of the fire - annealing: 1, annealing is t... Read More

Factors affecting oxidation of forgings

The oxidation of forgings is mainly affected by the chemical composition of the heated metal and the internal and external factors of the heating ring (such as furnace gas composition, heating temperature, etc.). 1) Chemical composition of metal materials The amount of oxide scale formed is close... Read More

Methods for inspection of large forgings

Due to the high cost of raw materials for large forgings, as well as the production process, if defects occur, they will affect the follow-up processing or poor processing quality, and some affect the performance and use of forgings strictly, even reducing the service life of the finished parts, ... Read More

Injection molding of stainless steel flanges

Stainless steel flanged ball valve, globe valve, gate valve when used, only for fully open or closed, do not allow to do flow regulation, so as to avoid sealing surface erosion, accelerated wear. Gate valves and upper screw globe valves have reverse sealing device, hand wheel to the top to the us... Read More

What’s different killed steel and Rimmed steel!!!

Killed steel is steel that has been completely deoxidized by the addition of an agent before casting such that there is practically no evolution of gas during solidification. It is characterized by a high degree of chemical homogeneity and freedom from gas porosities.   Semi-killed steel i... Read More

How is the flange welded?

1. Flat welding: only welding the outer layer, without welding the inner layer; Generally used in medium and low pressure pipelines, the nominal pressure of the pipeline is less than 0.25mpa. There are three kinds of sealing surface of flat welding flange, which are smooth type, concave and conve... Read More

There are problems in the processing of stainless steel forgings

Weld defects: weld defects are serious, manual mechanical grinding processing method is used to compensate, resulting in grinding marks, resulting in uneven surface, affect the appearance. Inconsistent surface: only pickling and passivation of the weld will cause uneven surface and affect the app... Read More

The reason of sliding or crawling of hydraulic cylinder piston and the treatment method

Hydraulic cylinder piston sliding or crawling will make the hydraulic cylinder work instability. Do you know the reason for it? Do you know what to do with it? The following article is mainly for you to talk about. (1) hydraulic cylinder internal astringency. Improper assembly of the internal par... Read More

Flange features and use attention

Flanges are disk-shaped parts most commonly used in piping. Flanges are used in pairs and with matching flanges on valves. In pipeline engineering, flanges are mainly used for the connection of pipelines. In the need to connect the pipeline, all kinds of installation of a flange, low pressure pip... Read More

How to improve the production efficiency of forging heat treatment

【DHDZ】As we all know, heat treatment is an important link in the forging process, related to the hardness of forgings and other problems, so how to improve the production efficiency of heat treatment forgings? Improve the efficiency of heat treatment production, by increasing the furnace charg... Read More

What should be noted in the examination of die forgings before heat treatment?

The inspection before solution heat treatment is a pre-inspection procedure to check the finished product's surface quality and dimensions according to the technical conditions, die forging drawing and process card after the forging forming process is finished. Specific inspection should pay atte... Read More

Different connection modes of flange elbow

Flanges, or flanges, are symmetrical disk-like structures used to connect pipes or fixed shaft mechanical parts. They are usually fixed with bolts and threads. Including flange and stainless steel flange elbow, give you a brief introduction to the flange and pipe connection of several ways. The f... Read More
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