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The grades of stainless steel and heat-resistant steel are indicated by alloy element symbols and Arabic numerals specified in the standard. For cutting stainless steel and free cutting heat-resistant steel, add "Y" at the head of the grade. Generally, one Arabic numeral is used to represent the average carbon content (in thousands); When the average carbon content is ≥ 1.00%, it is represented by two Arabic numerals; When the upper limit of carbon content is less than 0.10%, the carbon content is represented by "0"; When the upper limit of carbon content is ≤ 0.03% and > 0.01% (ultra-low carbon),…

① The grades of alloy structural steel are indicated by Arabic numerals and standard chemical element symbols. Use two Arabic numerals to represent the average carbon content (in tens of thousands) and put it at the head of the brand. The expression method of alloy element content is: when the average content is less than 1.50%, only elements are indicated in the brand, and generally the content is not indicated; When the average alloy content is 1.50% ～ 2.49%, 2.50% ～ 3.49%, 3.50% ～ 4.49%, 4.50% ～ 5.49%,... Write 2, 3, 4, 5... After the alloy element. For example, when…

High quality carbon structural steel adopts two Arabic numerals (the average carbon content is expressed in tens of thousands) or Arabic numerals and element symbols to form a brand. ① For, rimmed steel and semi killed steel, the symbols "F" and "B" shall be added at the end of the grade respectively. For example, the grade of rimmed steel with an average carbon content of 0.08% is expressed as "08F"; The grade of semi killed steel with an average carbon content of 0.10% is expressed as "10B". ② . killed steel (s and P ≤ 0.035% respectively) is generally not…

Carbon structural steel and low-alloy high-strength structural steel are usually divided into general steel and special steel. The brand representation method is composed of the Chinese phonetic alphabet of the yield point or yield strength of the steel, the value of the yield point or yield strength, the quality grade of the steel, and the deoxidation degree of the steel, which is actually composed of four parts. ① The Pinyin letter "Q" representing the yield point is used for general structural steel. The yield point value (unit: MPa), quality grade (a, B, C, D, e), deoxidation method (F, B, Z,…

The designation of steel products in China is generally expressed by the combination of Chinese Pinyin letters, chemical element symbols and Arabic numerals. Namely: ① Chemical elements in steel grades are represented by international chemical symbols, such as Si, Mn, Cr, etc. Mixed rare earth elements are represented by "re" (or "XT"). ② Product name, purpose, smelting and pouring method, etc. are generally represented by abbreviations of Chinese pinyin, ③ The content (%) of main chemical elements in steel is expressed in Arabic numerals. When the Chinese phonetic alphabet is used to represent the product name, purpose, characteristics and process…

When the steel type (No.) is unknown, we can determine whether it is stainless steel and what kind of stainless steel it belongs to with the help of simple instruments and senses according to the inherent physical and chemical properties of commodities (including whole materials, surplus materials, waste materials and other objects). It should be pointed out that the sensory identification can not distinguish the specific steel (type) number, but can basically distinguish three categories: chromium stainless steel, chromium nickel stainless steel (SUS304, 304) and chromium manganese nitrogen stainless steel (200 Series). The identification methods are as follows: 1. Color…

As we know, the speed of sound refers to the speed of sound. The standard speed is to test the speed of sound propagation in the air at the sea level of 15 ℃ (the speed is different in water or other media). The speed of sonic sound in air at 15 ℃ is 340 meters per second, about 1224 kilometers per hour. Supersonic speed refers to the state that the speed is greater than 340 meters per second. The speed less than 340 meters per second is called subsonic speed. The speed equal to 340 meters per second is…

Traditional manufacturing machines cannot easily integrate a variety of raw materials in the process of cutting or mold forming. With the development of multi-material 3D printing technology, we have the ability to integrate different raw materials. Raw materials that cannot be mixed before will form new materials after mixing. These materials have a wide variety of colors and unique properties or functions. When using 3D printing for the first time, there are various processes and materials to choose, so which process and materials should we choose? There are usually the following considerations: cost, appearance, details, mechanical properties, mechanical properties, chemical…