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After looking at a lot of old drawings and several professional drawings, there is a problem that has always troubled me. When clarifying the product brand of steel on the drawings, there will be names such as steel number and steel number. For those who are engaged in structural work, In other words, strength is a big issue, and not knowing the meaning of these brands is like a blind man trying to figure out the elephant.
After some research on the hardware watch, I finally found the answer. Let’s briefly talk about the conclusion.
Steel and
are both grades of carbon structural steel and belong to the category of "carbon structural steel"/. It is a steel grade in the old standard, but this grade is no longer in the current standard. In the current standard, it is included in
. It is equivalent to
in the new brand. After all, this brand has been used before, so many people are still used to using it, just like there are still people who are used to using units such as Jinliang. Steel is carbon structural steel and is Category A steel specified in the standard. Category A steel guarantees mechanical properties and Category B steel guarantees chemical composition. It has been replaced, so the concept of steel no longer exists. This brand name is no longer used, although some people still call it that. In the past, it is usually replaced by
now.
The current version is divided into four levels according to the quality level. In addition to the ingredients, the main changes are the element content. As the level increases, the requirements are lower. In terms of mechanical properties, the grade only guarantees the conventional tensile strength, yield strength and elongation. The grade starts to increase the cold bending and room temperature impact energy. The grade guarantees the ℃ impact work. The grade guarantees the ℃ impact work. The lowest values are all. However, it is generally not easy to purchase high-grade products on the market, and it is even more impossible to obtain high-grade products. Most of them are replaced by high-grade products that have passed ingredient and performance retests and met pediatric requirements. Of course, if you are particularly rich, you can order grades and grades from steel mills. The price and minimum order quantity will probably shock you.
No. steel and No. steel belong to "High Quality Carbon Structural Steel"/, and the numbers represent the carbon content. The physical and mechanical properties and chemical composition of steel are close to those of
. According to the product standards of seamless steel pipes, there is no
steel. The closest thing to
steel is No. steel. No. steel is high-quality carbon steel. When used as
steel, there is no problem. The carbon content of No. 1 steel is greater than 20 parts per 10,000, and its welding performance and elongation cannot be used as a material for general steel structural components. It can be used for the production of high-strength bolts.
Steel belongs to "Low Alloy High Strength Structural Steel"/, the number represents the yield strength.
The old brand is that equal-weight structural steel is generally carbon structural steel and low-alloy high-strength structural steel, with tensile strength, elongation, yield strength, and sulfur and phosphorus content guaranteed, and containing Carbon quality assurance.
Steel is a substitute for many types of steel, such as old brands, rather than just one material. In terms of chemical composition, they are also different. What's more important is that there are large differences in the thickness grouping sizes of the two steel materials according to their different yield strengths, which will inevitably cause changes in the allowable stress of materials with certain thicknesses. Therefore, it is not appropriate to simply apply the allowable stress of steel to steel. Instead, the allowable stress should be re-determined based on the new steel thickness group size.
The proportion of the main constituent elements of steel is basically the same as that of steel, the difference is the addition of trace alloying elements. A small amount of alloying elements can refine the grains, improve the toughness of the steel, and greatly improve the comprehensive mechanical properties of the steel. It is precisely because of this that the thickness of the steel plate can be made larger. Therefore,
The comprehensive mechanical properties of steel should be better than those of steel, especially its low-temperature properties, which steel does not have.
The allowable stress of steel is slightly higher than that of steel.
Good comprehensive mechanical properties, low temperature performance, good plasticity and weldability, used as structural mechanical parts that bear dynamic loads such as medium and low-pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, etc. General metal structural parts for building structures, hot-rolled Or used in normalizing state, can be used in various structures in cold areas below ℃.
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