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Is there a requirement for hardness of shaft forgings?

Surface hardness and uniformity of shaft forgings are the main items of technical requirements and routine inspection. The hardness of the body shows the wear resistance, etc., in production, the resilience shore D hardness value HSd is used to express. The hardness requirements of shaft forgings... Read More

What are the quality checks for forgings?

In order to ensure the quality of forgings to meet the requirements of design and use of the indicators, it is necessary to forgings (blank, semi-finished products and finished products) quality inspection. The content of forgings quality inspection includes: chemical composition inspection, appe... Read More

Details to note when using threaded flanges

Threaded flange refers to a flange connected by thread and pipe. During design, it can be handled according to loose flange. The advantage is that no welding is required, and the additional torque produced by the flange deformation on the cylinder or pipe is very small. The disadvantage is that t... Read More

Why do you choose 304 butt welded stainless steel flanges

Let's start with a fact: Austenitic stainless steel pipes are commonly used in a variety of corrosive environments. However, if you are careful, you will find that in the design documents of some units, as long as DN≤40, all kinds of materials are basically adopted. In the design documents of oth... Read More

How to identify the quality of forging

The main task of forgings quality inspection and quality analysis is to identify the quality of forgings, analyze the causes of forgings defects and preventive measures, analysis and research It is an important way to improve and guarantee the quality of forgings to investigate the causes of defe... Read More

Three methods of carbon steel flange sealing

There are three types of carbon steel flange sealing surface, which are: 1, tenon sealing surface: suitable for flammable, explosive, toxic media and high pressure occasions. 2, plane sealing surface: suitable for pressure is not high, non-toxic medium occasions. 3, concave and convex sealing sur... Read More

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
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