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Difference between 304, 304L, 316 and 316L in the valves field

What is Stainless Steel? Stainless steel is a type of steel. Steel refers to steel containing less than 2% carbon (C) and iron is more than 2%. The addition of chromium (Cr), nickel (Ni), manganese (Mn), silicon (Si), titanium (Ti), molybdenum (Mo) and other alloying elements in the smelting process improves the properties of the steel and makes the steel resistant to corrosion. (that is, not rust) is the stainless steel we often say. What is the meaning of “steel” and “iron”, what are the characteristics, and what is the relationship between us, 304, 304L, 316, 316L, which we usually […]

2019-03-09

Forged valve installation and maintenance methods

The quality of the forged valve installation directly affects its use, so the forged valve installation must be treated carefully. 1. The direction and position Many forged valves should be installed in a specific direction. If they are installed in a reversed direction, the operation effect and service life will be affected, or the forged valves will not work at all, and even cause danger. Generally, the forged valve has a direction mark on the forged valve body; if not, it should be correctly identified according to the working principle of the forged valve. The valve chamber of the globe […]

2019-02-14

Valve sealing

1, the principle of valve sealing Sealing is to prevent leakage, so the principle of valve sealing is also studied from leak prevention. There are two main factors that cause leakage. One is the most important factor affecting the sealing performance, that is, there is a gap between the sealing pairs, and the other is the pressure difference between the two sides of the sealing pair. The principle of valve sealing is also analyzed from four aspects: liquid sealing, gas sealing, leakage channel sealing principle and valve sealing pair. [1] Liquid tightness The tightness of the liquid is carried out by the […]

2019-01-20

What is a ring type joint flange?

What is a ring type joint flange? A Ring Type Joint Flange is a type of flange that uses a metal ring that sits in a hexagonal groove as a gasket to seal the flange pair. The flanges seal when the bolts are tightened and the gasket is compressed into the groove making a metal to metal seal. An RTJ flange usually has a raised face with the groove machined into the face of the flange. The raised face doesn’t serve as a way to contain the pressure. 1 Specifications 4 Benefit 7 Standards & Dimensions 2 Material 5 Characteristics 8 Tolerances 3 Designs 6 Disadvantages Specifications of […]

2018-11-16

What is ERW steel pipe

What is ERW steel pipe? “ERW steel pipe” is a straight seam electric resistance welded pipe, abbreviated as ERW pipe, which is a round pipe welded by steel plates. It is used to transport vapor and liquid objects such as oil and natural gas, and can meet various requirements of high and low pressure. At present, it plays an important role in the world of transportation pipes. 1 ERW 2 Manufacturing Process 3 Standard 4 Quality inspection process Electrical resistance welding Electric resistance welding (ERW) refers to a group of welding processes such as spot and seam welding that produce coalescence of faying surfaces where heat to form the […]

2018-11-09

What are the differences between casing and tubing?

What is casing pipe? Casing pipe, also called “encasement pipe,” is used in underground construction. Casing pipes safeguard many kinds of utilities, like water mains, electrical high-voltage lines, natural gas lines and fiber-optic communication lines from damage. These utilities need protection from human activity and natural elements. The construction of deep foundations also makes use of steel casing pipes. Casing pipe is used in different types of horizontal underground boring, where the pipe is jacked into an augered hole in segments and then connected together by welding or by threaded and coupled ends, or other proprietary pipe connectors. The steel […]

2018-11-02

What is EFW steel pipe

What is EFW steel pipe? EFW steel pipe (Electric Fusion Welding steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld. EFW steel pipe is formed by rolling plate and welding the seam. The weld flash can be removed from the outside or inside surfaces using a scarfing blade. The weld zone can also be heat treated to make the seam less visible. Welded pipe often has tighter dimensional tolerances than seamless, […]

2018-10-26

What is Hydraulic Steel Pipe?

What is Hydraulic Steel Pipe? Hydraulic steel pipe is basically divided into the hydraulic system with fluid pipe and oil cylinder, also known as honing tube, and cold drawn or cold rolled precision seamless steel pipe also contains hydraulic tube. Hydraulic pipe after finishing, no oxidation bright heat treatment of raw materials (NBK), nondestructive testing, steel pipe inner hole through high pressure washing, pickling, block on both ends of the steel tube inside and outside wall with anti-rust oil antirust processing, used as a dustproof. To produce steel pipes with high precision, finish good, tube inside and outside wall without oxidation layer, steel pipe can […]

2018-10-19

What is seamless steel pipe?

What is seamless steel pipe? The seamless steel pipe is a steel pipe made of a single piece of metal with no joints on the surface, called a seamless steel pipe. According to the production method, the seamless pipe is divided into a hot rolled pipe, a cold rolled pipe, a cold drawn pipe, an extruded pipe, a top pipe, and the like. According to the shape of the section, the seamless steel tube is divided into two types: a circular shape and a special shape. The shaped tube has a plurality of complicated shapes such as a square shape, […]

2018-10-12

What is a galvanized steel pipe?

What is a galvanized steel pipe? Galvanized pipe, also known as galvanized steel pipe, is divided into hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing layer is thick, with uniform plating, strong adhesion and long service life. The cost of electroplating is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipes. Hot dip galvanized pipe The molten metal is reacted with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove […]

2018-09-28

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Difference between 304, 304L, 316 and 316L in the valves field

Forged valve installation and maintenance methods

Valve sealing

What is a ring type joint flange?

What is ERW steel pipe

What are the differences between casing and tubing?

What is EFW steel pipe

What is Hydraulic Steel Pipe?

What is seamless steel pipe?

What is a galvanized steel pipe?