An Introduction of Common Steel Pipe Manufacture Methods
Steel pipes can be categorized into welded and seamless types. The following introduces several common steel pipe production methods. Seamless pipe Seamless...
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Common alloying elements of steel (part two)
Copper -- It has a moderate segregation tendency which when reaching a comparable content is detrimental to the thermal deformation process of steel. Copper has a negative impact on forging, but it does...
Common alloying elements of steel (part one)
Carbon -- Carbon is an indispensable alloying element in steel for the formation of cementite (and other carbides), pearlite, spheroidite, bainite and Fe-C martensite. A microstructure composed of one...
An intro of the forging process of martensitic stainless steel
Martensitic stainless steel has high hardenability and can be air-cooled and hardened. Because of that, when cold forging martensitic steels, especially those with high carbon steel, it is important to...
Flange assembly, gasket materials and fasteners
Flange assembly 1. Before assembling the flange, the flange surface, especially the sealing surface, must be cleaned. 2. When assembling slip-on flange, the pipe end should be inserted into two third...
How to maintain the sealing performance of valves?
Repairing the sealing surface is a large and important task because after long-term use, the sealing surface of the valve disc and the valve seat will wear and the tightness will be reduced. The main...
Effect of solid solution on flanges & stainless steel pipe fittings
For stainless steel pipe fittings and flange manufacturers, it is necessary to take into account not only the production cost of flange and pipe fittings, but more importantly, the factors that can prevent...
The difference between a butterfly valve and a gate valve
According to the functions and uses of gate valves and butterfly valves, a gate valve has small flow resistance and good sealing performance. Because the disc of the gate valve is perpendicular to the...
Slip-on flange: sealing principle & what should be noticed (part 2)
Forging of slip-on flanges can be categorized into rotary forging, roll forging, cross-wedge rolling, rotary swaging, etc. based on the movement mode. For improving the utilization rate of materials,...
Slip-on flange: sealing principle & what should be noticed (part 1)
Sealing principle The two sealing faces of the screw press against the flange gasket and form a seal, but this also causes damage to the seal. So, in order to maintain the seal, the screw bolts, as well...
Cautions for filling grease to valves
There are two problems may occur if the amount of grease is neglected when injecting. One is that the amount of grease is less than the required amount, and the abrasion of sealing surface is accelerated...
The production process of blind flanges
The production process of blind flange can be divided into three types: forging, casting and cutting. Cast flange and forged flange have a shape with accurate size, and advantages such as small workload,...
Causes of casting defects during the valve manufacturing process
This is an analysis of causes of casting defects during the valve manufacturing process. Gas Bubbles These are small cavities that cause by residual gas during the metal solidification process. Their...
What is a welded steel pipe?
Welded steel pipes are also known as welded pipes, which can be divided into longitudinal welded pipe and spiral welded pipes according to the type of weld joint; or furnace butt weld pipes, electric...
The advantages of seamless steel pipes and how to choose them
The application scope of steel pipes is quite extensive with the development of this industry that they have branched out into not only gas or liquid transportation, but also associated products manufacturing...
China has made strides in cutting overcapacity
China has made progress in reducing steel production capacity, which has led to increased efficiency and mismatch between supply and demand. In the first seven months of 2018, China cut 2.47 billion tons...
A brief introduction of a cast iron pipe
Cast iron pipes are used for water supply, drainage and gas pipelines. They include straight cast iron pipes and fittings. According to different casting methods, a cast iron pipe is divided into a continuous...
Corrosion of Stainless Steel Pipes
What is the crevice corrosion of stainless steel pipes? There may be metallic or non-metallic deposit sediment on the surfaces of stainless steel pipes, and the deposit sediment will form the crevice...
Effects of Chemical Elements on Stainless Steel Pipes (Part Two)
Sulfur(S): Sulfur is also a harmful element under the normal circumstance. It will create the hot brittleness of stainless steel pipes, decrease the impact ductility of stainless steel pipes and bring...
Effects of Chemical Elements on Stainless Steel Pipes (Part One)
1. Carbon(C): When the carbon content in the stainless steel pipes is increased, yield and tensile strength of stainless steel pipes will be increased, but the plasticity and impact strength will...