Is there any difference between 20G and 20g of steel for boilers? 20

The 20g steel pipe steel grades are all carbon structural steels with a carbon content of 0 20.

1,20 steel is used for general steel pipes, there are three standards.

Standard GB8162 is suitable for seamless steel pipes for structural use;

Standard GB8163 is suitable for general seamless steel pipes for conveying fluids;

The standard GB3087 is applicable to the seamless steel pipe of low and medium pressure boilers, and the standard is applicable to the manufacture of superheated steam pipes, boiling water pipes and high-quality carbon structural steel hot-rolled and cold-dialed (rolled) seamless steel pipes for locomotive boilers with superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes.

2,20g is commonly called No. 20 boiler steel, its material is better than ordinary No. 20 steel, 20g steel pipe is a high-quality carbon structural steel used in the manufacture of high-pressure and above pressure steam boilers, pipes, etc. For example, it is widely used to manufacture economizers, superheaters, water walls, feed water, main steam pipes, etc. with a medium temperature of 430.

Standard GB5310 is suitable for seamless steel tubes for high-pressure boilers.

3, 20g also refers to No. 20 boiler steel, 20g represents pipes, 20g represents plates, that is, they are made by rolling up and welding steel plates, which are used to manufacture high-quality carbon steel plates for various boiler pressure elements.

Standard GB713 is suitable for boiler carbon cable steel and low alloy steel plate.

There is no 20g grade of boiler steel, only 20g, boiler steel belongs to a special steel grade, and the first letter (lowercase) of the pinyin "guo" of the boiler pot word is used in its grade.

20g GB GB5310, low alloy steel;

20g GB GB 3087, ordinary carbon steel.

20g refers to 20 steel, there are also 20g. A material in steel. It belongs to the boiler plate.

G is the first letter of the "pot" in the boiler plate: G. In addition to their carbon content, 20g also has some trace elements that are more suitable for use as boilers and pressure vessels.

In addition, 20g also focuses on its physical properties. Such as bending, impact and tensile properties.

20G steel is the national standard steel number specified in the national standard GB 5310 "Seamless Steel Pipe for High-pressure Boilers" (foreign corresponding grades: Germany and Japan STB42, the United States SA106B), which is the most commonly used steel for boiler steel pipes, and its chemical composition and mechanical properties are basically the same as those commonly said to be 20 steel.

20 seamless steel pipe: for low carbon steel pipe, carbon steel is generally divided into low carbon steel, medium carbon steel and high carbon steel, of which 45 steel is medium carbon steel, less than 45 is low carbon steel, higher than 45 is high carbon steel, seamless steel pipe if there is no special requirements, are used 20 seamless steel pipe. 20 seamless steel pipe is made of 20 steel, the strength is slightly higher than that of 15, it is rarely quenched, and there is no tempering brittleness.

High cold deformation plasticity, generally for bending, calendering, bending and hammer arch processing, arc welding and contact welding have good welding performance, small thickness during gas welding, strict shape requirements or complex shape of the workpiece is prone to cracks. The machinability of cold drawing or normalizing is better than that of annealing, and it is generally used to manufacture workpieces with low stress and high toughness requirements.

20g seamless steel tube is a high-pressure boiler tube. In addition to their carbon content, 20g seamless steel pipes also have some trace elements that are more suitable for use as boilers and pressure vessels. In addition, 20g also focuses on its physical properties.

Such as bending, impact and tensile properties. 0g seamless steel pipe is a long strip of steel with a hollow section and no joints around the perimeter. Steel pipes have a hollow cross-section, and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and some solid materials.

Difference: 20 is the steel grade of ordinary seamless steel pipe. 20g is the steel grade for high-pressure boiler tubes.

20G steel pipe is GB 5310 national standard steel grade (foreign corresponding grades: Germany and Japan STB42, the United States SA106B), which is the most commonly used boiler steel pipe steel, and its chemical composition and mechanical properties are basically the same as those of 20 plates. The steel has a certain strength at room temperature and medium high temperature, low carbon content, better plasticity and toughness, and good cold and hot forming and welding performance.

20g boiler tube, also known as 20g high-pressure boiler tube, belongs to high-quality carbon structural steel tube.

1) High-quality carbon structural steel grades are 20g, 20mng, and 25mng.

2) Alloy structural steel steel grades: 15mog, 20mog, 12crmog, 15crmog, 12cr2mog, 12cr1movg, 12cr3movsitib, etc.

3) In addition to ensuring the chemical composition and mechanical properties, the 1Cr18Ni Cr18Ni11NB boiler tubes commonly used in stainless heat-resistant steel should be tested for hydraulic pressure one by one, and the flaring and flattening tests should be done. The steel pipes are delivered in heat-treated condition.

In addition, there are also certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.