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DHDZ forging 2020 year-end review meeting and 2021 welcome party for freshmen

2020 is an extraordinary year, the outbreak of the epidemic, the whole country is difficult, big state organs and some enterprises, small to every employee and ordinary people, all bear a huge test. At 15:00 on January 29, 2021, DHDZ forging organized the 2020 annual year-end summary meeting and... Read More

How to find the processing difficulties of stainless steel flange

First of all, before choosing the drill bit, take a look at the difficulties in stainless steel flange processing. Find out the difficulty can be very accurate, very fast to find the use of the drill. What are the difficulties in stainless steel flange processing? Sticky knife: stainless steel pr... Read More

What is the process of forging?

1. Isothermal forging is to keep the temperature of billet constant during the whole forming process. Isothermal forging is used to take advantage of the high plasticity of certain metals at constant temperature or to obtain specific structures and properties. Isothermal forging requires the mold... Read More

The main disadvantages of water as a quenching cooling medium for forgings ？

1) in the austenite isothermal transformation diagram of the typical area, that is, about 500-600℃, water in the steam film stage, the cooling rate is not fast enough, often cause uneven cooling and insufficient cooling speed forgings and the formation of the "soft point".In the martensite transf... Read More

What kind of bolt connection does stainless steel flange use?

Customers often ask: stainless steel flange connection whether to choose stainless steel bolts? Now I will write what I have learned to share with you: Material has nothing to do with the material of flange bolts, according to the European system HG20613-97 "steel pipe flange with fasteners (the... Read More

How to use welding flange correctly

Flanges With the rapid development of domestic foreign minister pipeline construction, pipeline pressure test has become an essential important link, before and after the pressure test, must pass the ball sweep line for each section of the pipeline, the number of times is generally 4~5. Especiall... Read More

Applications of hardenability and hardenability of forgings

Hardenability and hardenability are the performance indexes that characterize the quenching ability of forgings, and they are also the important basis for selecting and using materials.Hardenability is the maximum hardness that a forging can achieve under ideal conditions.The main factor determin... Read More

The way to improve the plasticity of forging and reduce the deformation resistance

In order to facilitate the flow forming of metal billet, reduce the deformation resistance and save equipment energy, the following methods are generally adopted in forging process: 1) Grasp the material characteristics of forgings, and select a reasonable deformation temperature, velocity and de... Read More

Flange standard

Flange standard: National standard GB/T9115-2000, Ministry of Machinery STANDARD JB82-94, Ministry of Chemical Industry standard HG20595-97HG20617-97, Ministry of Electric Power standard GD0508 ~ 0509, American standard ASME/ANSI B16.5, Japanese standard JIS/KS(5K, 10K, 16K, 20K), German standard... Read More

What are the methods of forging cleaning

Forgings cleaning is the process of removing surface defects of forgings by mechanical or chemical means. In order to improve the surface quality of forgings, improve the cutting conditions of forgings and prevent the surface defects from enlarging, it is required to clean the blank and forgings ... Read More

Defects and Countermeasures of large forgings: Uneven microstructure and properties

Large forgings, due to their large size, many processes, long cycle, non-uniformity in the process, and many unstable factors, often cause serious non-uniformity in the microstructure, so that they cannot pass the mechanical property test, metallographic inspection and non-destructive flaw detect... Read More

Defects and Countermeasures of large forgings: Forging cracks

In large forging, when the quality of raw materials is poor or forging process is not at the right time, forging cracks are often easy to occur. The following introduces several cases of forging crack caused by poor material. (1) Forging cracks caused by ingot defects Most of the ingot defects m... Read More
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