Industry News

Comparison between vacuum heat treatment and traditional heat treatment

Contents: What is heat treatment Heat treatment process Technical characteristics of heat treatment Classification of heat treatment processes Surface quenching and tempering heat treatment Local quenching heat treatment Chemical heat treatment Common problems in heat treatment Heat treatment deformation Surface decarburization What is vacuum heat treatment Technical classification of vacuum heat treatment Vacuum high pressure gas quenching technology Vacuum nitriding technology Vacuum high pressure gas cooled isothermal quenching Vacuum cleaning and drying technology Treatment process of vacuum heat treatment The principle of vacuum heat treatment Heating characteristics of vacuum heat treatment Main applications of vacuum heat treatment Comparison between vacuum […]

2019-12-12

Dynamic Diagram of Various Casting Processes

What is casting? Liquid metal is poured into the mold cavity corresponding to the shape and size of the part, and then it is cooled and solidified to obtain the production method of blank or part, which is usually called liquid metal forming or casting. Casting is a kind of metal hot working technology which has been mastered by human beings for about 6000 years. China has entered the heyday of bronze casting from about 1700 BC to 1000 BC, and its technology has reached a quite high level. Casting is a method of casting liquid metal into a casting […]

2019-12-12

What is the minimum flow valve?

What is the minimum flow valve? The minimum flow valve, also known as the automatic recirculation valve, is a pump protection valve installed at the outlet of the feed pump, which is used to prevent the damage of the feed pump caused by overheating, serious noise, instability and cavitation when the feed pump is running under the load. As long as the flow of the feed pump is lower than a certain value, the bypass return port of the valve will automatically open to ensure the minimum flow required by the liquid feed pump. The minimum flow valve is used […]

2019-12-08

What is a pressure relief valve?

What is a pressure relief valve? The relief valve or pressure relief valve is a valve that can reduce the inlet pressure to a certain required outlet pressure through regulation and make the outlet pressure automatically maintain stable by relying on the energy of the medium itself. From the point of view of hydrodynamics, the pressure relief valve is a throttling element whose local resistance can be changed. That is to say, by changing the throttling area, the velocity and kinetic energy of the fluid can be changed, resulting in different pressure losses, so as to achieve the purpose of […]

2019-12-07

What is hot rolled and cold rolled?

There are mainly two kinds of stainless steel plate, hot rolling and cold rolling. The difference between them is very obvious from appearance to application performance. This paper will give a detailed description. Contents: What is hot rolling What is cold rolling Advantages and disadvantages of hot rolling and cold rolling Coil Hot rolled coil Cold rolled coil What is hot rolling? Hot rolling is to take slab (mainly continuous casting slab) as raw material, after heating, it is made into strip steel by roughing mill and finishing mill. The hot steel strip from the last finishing mill is cooled […]

2019-12-05

Why do we think titanium alloy flange is difficult to process?

What is a titanium flange? Titanium flange is a kind of component made of titanium or titanium alloy, which is connected to the pipe end. It can be made by casting, or by screw connection and welding. The flange connection consists of a pair of flanges, a gasket and a number of bolts and nuts. The gasket is placed between the two flange sealing surfaces. After the nuts are tightened, the specific pressure on the gasket surface reaches a certain value, and the deformation occurs, and the uneven parts on the sealing surface are filled, so that the connection is […]

2019-12-01

Four production processes of flanges

Flange production process mainly includes forging, casting, cutting and rolling: Casting is a method of casting liquid metal into a casting cavity which is suitable for the shape of the flange. After it is cooled and solidified, the blank of the flange can be obtained most of the cast materials are originally solid but heated to liquid metal (e.g. copper, iron, aluminum, tin, stainless steel, etc.), while the mold materials can be sand, metal or even ceramics. Forged flange is one of the products with the best mechanical properties in flange products. Its raw material is generally tube blank, and […]

2019-11-28

What is Q345 steel?

Q345 is a steel material. It is a low alloy steel (C < 0.2%), widely used in construction, bridges, vehicles, ships, pressure vessels, etc. Q stands for the yield strength of this material. The latter 345 is the yield value of this material, which is about 345 MPa. The yield value will decrease with the increase of material thickness. Contents 1. Comprehensive performance 2. Performance comparison 3. Product series 4. Welding characteristics 5. Q345 steel grade upgraded to Q355 Comprehensive performance of Q345 Q345 has good comprehensive mechanical properties, low temperature performance, good plasticity and weldability. It is used as […]

2019-11-28

Optimization of annealing process for low carbon ferritic stainless steel high……

With the rapid development of modern industry driven by the progress of science and technology, large-scale infrastructure construction leads to the increasing demand for stainless steel. Although austenitic stainless steel has absolute advantages in plasticity and corrosion resistance, its high cost limits its large-scale application. Ferritic stainless steel has low cost, low expansion coefficient and high thermal conductivity. Among them, 12% Cr ferritic stainless steel has become the representative of economic stainless steel because of its relatively low Cr content [1,2,3]. CR can combine with oxygen to form a layer of oxide Cr2O3 which is closely combined with the matrix […]

2019-11-21

The influence of tightening technology on the pre tightening force of bolts

Thread connection is widely used. Although it looks simple, its working process is extremely complex and relevant theoretical knowledge is less. At present, torque method is widely used in the process of bolt connection, which is mainly based on the control torque to ensure the axial preload [2]. However, it is considered that there are elements such as connection material, tightening speed and continuous friction in the process of connection In addition, for places with a large number of bolts, sealing is very important. It should not only guarantee the torque value, but also make it evenly distributed. Because the […]

2019-11-21

+86-18267732328

sales@steeljrv.com

Comparison between vacuum heat treatment and traditional heat treatment

Dynamic Diagram of Various Casting Processes

What is the minimum flow valve?

What is a pressure relief valve?

What is hot rolled and cold rolled?

Why do we think titanium alloy flange is difficult to process?

Four production processes of flanges

What is Q345 steel?

Optimization of annealing process for low carbon ferritic stainless steel high……

The influence of tightening technology on the pre tightening force of bolts