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The chemical composition of carbon steel is mainly iron, followed by carbon, so it is also called carbon steel or iron-carbon alloy, and its carbon content is. Carbon steel in addition to iron
Alloy steel is in the steelmaking process, in order to improve the performance of steel, the total content of alloying elements is less than 5% is called low-alloy steel.
It is mainly used for steel for engineering structures and mechanical parts, generally low and medium carbon steel, which is mainly used for each.
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First of all, to correct it, carbon steel is actually alloy steel. In fact, your problem can be explained in many ways, first, the atomic mass added by other alloy steels is greater than that of carbon atoms, and the intermolecular gravitational force is large; Second, different combinations have different structures.
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Summary. Hello:
Quickly distinguish from the different points of the two. There are 3 differences between ordinary carbon steel and low-alloy steel:
First, the use of the two is different:
1. The use of ordinary carbon steel: This type of steel has a wide range of applications, most of which are used as welded, riveted or bolted steel structural parts, and a few are used to make various machine parts.
2. The use of low-alloy steel: low-alloy steel has been widely used in the manufacture of construction machinery, ships, bridges, high-rise buildings, boilers and pressure vessels, electric power, and various vehicles.
What is the difference between ordinary carbon structural steel and ordinary low alloy steel used in engineering.
Hello: Quickly distinguish from the different points of the two. There are 3 differences between ordinary carbon steel and low-alloy steel:
1. The uses of the two are different: 1. The use of ordinary carbon steel: This type of steel has a wide range of applications, most of which are used as welded, riveted or bolted steel structural parts, and a few are used to make various machine parts.
2. The use of low-alloy steel: low-alloy steel has been widely used in the manufacture of construction machinery, ships, bridges, high-rise buildings, boilers and pressure vessels, electric power, and various vehicles.
2. The characteristics of the two are different: 1. The characteristics of ordinary carbon steel: compared with high-quality carbon steel, the restrictions on carbon content, performance range, phosphorus, sulfur and other residual elements are wider.
2. The characteristics of low-alloy steel: this kind of steel has relatively high strength, good comprehensive performance, and has corrosion resistance, wear resistance, low temperature resistance, good cutting performance, welding performance, etc. Third, the overview of the two is different:
1. Overview of ordinary carbon steel: Ordinary carbon steel is the abbreviation of ordinary carbon structural steel. The carbon content is less than that, and less than is the most commonly used.
It is a mild steel, and each metal grade indicates the lowest yield point of the steel grade when the thickness is less than 16mm. 2. Overview of low-alloy steel: Low-alloy steel refers to alloy steel with the total amount of alloying elements less than 5%.
Low-alloy steel is relative to carbon steel, which is based on carbon steel, and in order to improve the properties of the steel, one or several alloying elements are intentionally added to the steel.
What is the difference between the performance of the two?
1. The use of ordinary carbon steel: This type of steel has a wide range of applications, most of which are used as welded, riveted or bolted steel structural parts, and a few are used to make various machine parts. 2. The use of low-alloy steel:
Low-alloy steel has been widely used in the manufacture of construction machinery, ships, bridges, high-rise buildings, boilers and pressure vessels, electric power, and various vehicles.
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Hello, ordinary low-alloy steel has the following advantages over similar carbon steels: 1: high strength, good plasticity and toughness.
Due to the effect of the alloy element hall, its strength is 25%-50% higher than that of ordinary carbon steel, the elongation is 15%-23%, and the impact toughness at room temperature is 60J cm higher than that of the car: good weldability. Due to the low carbon content and low content of alloying elements, its plasticity is good and the hardenability is low, so it is not suitable for quenching structure or cracks at the weld.
3: Good processing performance of cold and hot pressure. Due to its good plasticity and low deformation resistance, it is not easy to crack after pressure processing.
4: Good corrosion resistance. It has higher hidden corrosion resistance than carbon steel in various atmospheric conditions.
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19.Why is the strength and toughness of low-alloy high-strength structural steel better than carbon steel with the same carbon content?
19.Why the strength and toughness of low-alloy high-strength structural steel is better than that of carbon steel with the same carbon contentLow-alloy high-strength structural steel is based on the carbon structural steel with carbon content WC, and a small amount of Hexun gold element is added, the toughness is higher than that of carbon structural steel, and it has good welding performance, cold and hot pressure processing performance and corrosion resistance, and some steel grades also have a lower brittle transition temperature. The ratio of this type of steel to carbon structural steel.
It has the advantages of high strength, good comprehensive performance, long service life, wide application range, and comparative defeat. The steel is mostly rolled into plates, profiles, seamless steel pipes, etc., and is widely used in bridges, ships, boilers, vehicles and important building structures.
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Carbon structural steel refers to carbon steel with less carbon content.
Carbon structural steel can be divided into ordinary carbon structural steel and high-quality carbon structural steel. The former contains more impurities, is cheap, and is used in places with low performance requirements, and its carbon content is mostly below, and the manganese content does not exceed it, and the strength is low, but the plasticity, toughness, and cold deformation performance are good. Except for a few cases, it is generally not heat treated and used directly.
Through carbon structural steel, it is mostly made of bar steel, special-shaped steel, steel plate, etc. It is mainly used in railways, bridges, and all kinds of construction projects, and manufactures various Youqing metal components that bear static loads and mechanical parts that do not need heat treatment before the round is not important. High-quality carbon structural steel is pure, with few impurities, good mechanical properties, and can be used after heat treatment.
Mechanical properties of carbon structural steel
Carbon structural steel mainly guarantees mechanical properties, so its grade reflects its mechanical properties, expressed by Q+ numbers, where "Q" is the yield point of the Chinese Pinyin prefix of the word "yield", and the number represents the yield point value, for example, Q275 indicates that the yield point is 275MPa. If the letters A, B, C, D are marked after the grade, it means that the quality grade of the steel is different, the amount of S and P is reduced in turn, and the quality of the steel is improved in turn.
If the letter "F" is marked after the grade, it is boiling steel, "B" is semi-calmed steel, and if it is not marked with "F" or "B", it is calmed steel. For example, Q235-A·F represents a grade A boiling steel with a yield point of 235MPa, and Q235-C represents a grade C calm steel or special calm steel with a yield point of 235MPa.
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Kiss! Hello, happy to answer your <>
The mechanical properties and uses of carbophilic bonded steel and alloy structure are roughly the same as follows: alloy structural steel due to the addition of alloying elements nickel, silicon, chromium, manganese, molybdenum, boron, etc., to improve the welding performance and comprehensive mechanical properties of the steel, carbon structural steel is the steel that does not add alloying elements to change the properties just now, you can understand that carbon is an alloying element, carbon structural steel is a carbon-containing steel, and does not have the excellent mechanical properties and welding properties of steel with other alloying elements. The advantage of carbon steel is that it is cheap, and the alloying elements also cost money.
With the increase of carbon content, the hardness and stiffness increase and the toughness decreases. Increased brittleness. The more alloying elements change the properties of the steel, the better, with the increase of alloying elements, the weldability decreases, and it is easy to crack cold.
There is a way to evaluate the weldability of steel is the carbon equivalent method, which is to treat the role of the alloy element in the steel with the same amount of carbon content. I hope my eyes can help you <>
Do you have any other questions?
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Compared to carbon structural steel, low-alloy high-strength structural steel.
What are the characteristics of performance and use?
Carbon bonded steel: In order to improve the yield strength of carbon steel, it is necessary to continuously increase the carbon content of carbon steel, but then the weldability, plasticity, fatigue resistance, and low temperature resistance of steel deteriorate. Therefore, the application of high-strength carbon steel is limited.
Low-alloy high-strength structural steel: with excellent mechanical indicators. At the same time, it overcomes the defects in the performance of high-carbon steel. It can be used well in the welding process to work in unfavorable environments such as fatigue and low temperature.
Nichrome has a greater resistance.
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