What is a 20g high pressure boiler tube? 20G high pressure boiler tube is a kind of seamless tube. The manufacturing method is the same as that for seamless pipes, but there are strict requirements for the steel grades used to make steel pipes. According to the use of temperature is divided into general boiler tubes and high pressure boiler tubes. 20G high-pressure boiler tubes are often used under high temperature and high pressure conditions. The tubes are subject to oxidation and corrosion under the effect of high-temperature flue gas and water vapor. The steel pipe is required to have a high durable strength, a high resistance to oxidation corrosion, and a good organization stability. Then the following Xiaobian will give you information on what is a 20g high pressure boiler tube.
What is a 20G high pressure boiler tube
20G high pressure boiler tube is, 20G high pressure boiler tube is a kind of seamless tube. However, there are stringent requirements for steel grades used to make steel pipes. 20G high-pressure boiler tubes are often used under high temperature and high pressure conditions. The tubes are subject to oxidation and corrosion under the effect of high-temperature flue gas and water vapor. The steel pipe is required to have a high durable strength, a high resistance to oxidation corrosion, and a good organization stability. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air tubes, and main steam tubes for high-pressure and ultra-high-pressure boilers.
20G high-pressure boiler tubes used boiler pressure component steel, generally less than 39 kilograms of boiler applications, in order to use under higher pressure, often heated surface tube design is very thick. In order to reduce thermal resistance and save steel, ensure the safety of high or high pressure boiler steel, and also to reduce the amount of steel used, 16MnG is commonly used. At the same time there are special steels such as rare earth, magnesium and other non-metallic materials. This will improve the performance of the boiler steel, reduce the consumption of steel, but also reduce the thermal resistance.
1 Overview
(1) Manufacturing methods:
1 The general boiler tube temperature is below 450°C, and domestic tubes are mainly made of No. 10 and No. 20 carbon steel hot-rolled tubes or cold drawn tubes.
2 High-pressure boiler tubes are often used under high temperature and high pressure conditions. The tubes are subject to oxidation and corrosion under the effect of high-temperature flue gas and water vapor. The steel pipe is required to have high endurance strength, high oxidation corrosion resistance, and good organization stability.
(2) Uses:
1 General boiler tubes are mainly used to manufacture water-cooled wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes, and arched brick tubes.
2 High-pressure boiler tubes are mainly used to produce superheater tubes, reheater tubes, air tubes, and main steam tubes for high-pressure and ultra-high-pressure boilers.
2. Kind
The boiler tubes are divided into general boiler tubes and high pressure boiler tubes according to the high temperature performance they are subjected to. No matter whether the general boiler pipe or high-pressure boiler pipe is different according to its use requirements, it can be divided into various steel pipes.
3. Specifications and appearance quality
(1) GB3087-82 "precision steel pipe for low and medium pressure boilers" provisions. All kinds of boiler tubes for structural purposes have an outer diameter of 10 to 426 mm, a total of 43 types. There are a total of 29 kinds of wall thickness 1.5 to 26mm. However, the outer diameter and wall thickness of superheated steam pipes, large smoke pipes, small smoke pipes, and arched brick pipes for locomotive boilers are additionally specified.
(2) GB5310-95 "precision steel pipe for high-pressure boilers" The outside diameter of hot-rolled pipe is 22-530mm, and the wall thickness is between 20-70mm. Cold-drawn (cold-rolled) tubes have an outer diameter of 10 to 108 mm and a wall thickness of 2.0 to 13.0 mm.
(3) GB3087-82 "precision steel pipe for low and medium pressure boilers" and GB5310-95 "precision steel pipe for high pressure boilers" provisions. Appearance quality: No cracks, folds, pleats, knots, delamination, and hairline are allowed on the inner and outer surfaces of steel pipes. These defects should be completely removed. The depth of clearance shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the cleaning site shall not be less than the minimum allowed by the wall thickness.
20G High Pressure Boiler Tube Features
The products made of such steels are normally subjected to heat treatment (normalizing or refining); the zeros and parts made of them must be tempered or surfaced before they are used. Alloy structural steels are based on high-quality carbon structural steels, and one or more alloying elements are appropriately added to regress the mechanical properties, toughness, and hardenability of the steel. Products made of this type of steel are normally subjected to heat treatment (normalizing or refining); before they are used, the parts and components must be subjected to quenching or surface chemical treatment (carburizing, nitriding, etc.) , surface quenching or high frequency quenching and other processing. Therefore, according to the same chemical elements (mainly carbon content), heat treatment process and use, this kind of steel is roughly divided into red carburizing, quenched and tempered steel and nitrided steel.
The 20G high pressure boiler tube is an alloy high pressure boiler tube and belongs to alloy structural steel.
The 20G high pressure boiler tube is an alloy high pressure boiler tube and belongs to alloy structural steel. This type of steel is rolled (forged) into round, square, and flat sections and seamless steel tubes. It is mostly used in the production of secondary and larger parts and components, high-pressure pipes and containers in mechanical products. This high-quality carbon structure Steel has a more excellent overall performance.
Seamless steel tubes made of such steel are widely used in hydraulic props, high-pressure gas cylinders, high-pressure boilers, fertilizer equipment, petroleum cracking, automobile axle bushings, diesel engines, and hydraulic pipe fittings. Alloy structural steel is based on high-quality carbon structural steel, appropriate to add one or more alloying elements, used to regress the mechanical properties of steel, tough 20G high pressure boiler tube and hardenability.
Editor's summary: The relevant information on the 20g high-pressure boiler tube was introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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