News
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The sealing principle and characteristics of flange
Sealing of flat-welded flanges has always been a hot issue related to the production cost or economic benefit of enterprises. However, the main design disadvantage of flat-welded flanges is that th...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...Read more -
Congratulations on Resumption of Work
Congratulations on Resumption of Work Dear new and old customers and friends, Happy New Year. After a happy Spring Festival holiday, Lihuang Group (DHDZ)started normal work on February 18th. All th...Read more -
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...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 dri...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 consta...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 an...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...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 t...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.Hardenabilit...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 ma...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 ~ 0...Read more
