Classification of low alloy steel price of low all

2022-07-22
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Alloy steels with less than 5% total alloying elements are called low alloy steels. Compared with carbon steel, low alloy steel is intended to add one or more alloy elements to steel in order to improve one or more properties of steel on the basis of carbon steel When the amount of alloy added exceeds the general content of carbon steel in the normal production method, this kind of steel is called alloy steel. When the total amount of alloy is less than 5%, it is called low alloy steel. Alloy content between 5-10% is called medium alloy steel; More than 10% is called high alloy steel

since the 1970s, China's steel industry has developed rapidly. Now, it is an indispensable building and industrial material in China. According to the mass fraction of elements contained in steel, we divide steel into alloy steel and non alloy steel. Low alloy steel is to change the properties of steel, so that on the basis of carbon steel, other different alloys are added to form a kind of steel. Low alloy steel refers to steel with less than 5% of the total alloy. So how much do you know about the classification of low alloy steel? Today, I will introduce the classification of alloy steel to you. I also hope that through the following introduction, you will have a new understanding of the classification of low alloy steel

Introduction to low alloy steel

alloy steel is relative to carbon steel. On the basis of carbon steel, we add one or more alloy elements to it to continue processing, so as to improve some properties of steel. Among them, the alloy steel with low alloy element content (less than or equal to 5%) is low alloy steel. Generally speaking, after adding alloy elements, the performance of steel in strength, hardness, plasticity, weldability, corrosion resistance and other aspects can be greatly improved to meet our specific high requirements for steel in some occasions

classification of low alloy steel

the classification of low alloy steel includes ordinary quality low alloy steel, high-quality low alloy steel and special quality low alloy steel

I. ordinary quality low alloy steel

first of all, ordinary quality low alloy steel is introduced. This kind of low alloy steel of ordinary quality means that there is no special requirement on this problem in the production process, and its alloy content is relatively low, and there is no heat treatment. The maximum content of sulfur and phosphorus in low alloy steel of ordinary quality is greater than or equal to 0.045%. Its minimum tensile strength is less than or equal to 690mpa, its minimum elongation is less than or equal to 26%, the minimum yield point or yield strength is less than or equal to 360MPa, the minimum impact energy is less than or equal to 27j, and the minimum bending center diameter is greater than or equal to 2× Specimen thickness

II. High quality low alloy steel

next, I'll introduce you to high quality low alloy steel. This kind of material refers to some quality problems that need special emphasis in the production process. For example, in production, we need to reduce its sulfur and phosphorus content, but also need to control its grain size, so as to improve its surface quality. This high-quality low-alloy steel also includes high-strength structural steel that can be used for welding, low-alloy steel for boilers and pressure vessels, low-alloy steel for shipbuilding, low-alloy steel for automobiles, low-alloy steel and bicycles for bridge construction, low-alloy steel for railways, low-alloy steel for oil and gas pipelines, and so on

III. low alloy steel with special quality

finally, I will introduce low alloy steel with special quality. This kind of steel is strictly controlled in performance and quality during the production process, especially in sulfur, phosphorus and other impurities, so as to improve its purity

low alloy steel standard

I. industry name standard

1 The first two digits of the steel grade represent the average content of carbon, and the unit of magnitude is one ten thousandth. For example, 40Cr means that the average carbon content in steel is 40 per 10000

2. In steel grades, the expression of alloy elements is generally in the order of percent. When the mass fraction of the alloy is less than 1.5%, it can not indicate the content, but only indicate the alloy elements. In order to avoid confusion between different elements, it can also be marked with 1

3. Some microalloyed elements in steel, such as rare earth elements, vanadium, boron, etc., should be indicated in the steel grade regardless of the content

4. If the steel is high-quality steel, the letter A should be added at the end of the steel grade to distinguish it from general high-quality steel

5. For low alloy steel with specific purpose, the corresponding serial number shall be indicated at the end of the right to indicate its purpose

II. High yield strength standard

in order to achieve a certain yield strength, the content of some alloy elements in steel also has a certain standard. For example, in high-quality low-alloy steel, the minimum content of aluminum is 0.1%, that of lead is 0.4%, that of cobalt and cesium is 0.1%, that of boron is 0.008%, and that of silicon is 0.5%

among them, there is also a weldable fine grain structural steel with the following additional requirements:

1 The thickness of steel shall be less than or equal to 16.0mm, and the minimum yield strength shall not be greater than 420MPa

2. The minimum content of alloying elements shall be as described above

3. When the alloy steel contains multiple limit elements, the content requirements of these elements shall be met respectively, and the comprehensive content shall be equal to 70% of the sum of the contents of various limit elements

factors affecting the price of low alloy steel

the price of low alloy steel is mainly affected by its product name, specification and manufacturer. In addition, the price of low-alloy steel can also be affected to a certain extent by different factors such as the material, starting batch number, time point and so on. In terms of starting batch, some low alloy steels are purchased more, and there will be preferential prices

low alloy steel manufacturer

(1) low alloy round steel, product name: alloy steel, material: 16Mn, Dongguan Chang'an Shenyou metal materials business department

(2) low alloy steel, product name: alloy steel, material: 45CrNiMoV, specification: round steel diameter 10-350, steel plate thickness 3-300, Dongguan Minglong mold steel business department

(3) low alloy round steel, product name: low alloy round steel, material: Q345C, Liaocheng Aofeng metal materials Co., Ltd.

(4) low alloy steel, product name: low alloy round steel, material: Q345E, Wuxi high strength Special Steel Co., Ltd.

(5) low alloy steel, product name: cold rolled high strength steel, material: b220is, specification: 0.84× 1350× C. Shanghai Suhan Industrial Co., Ltd.

(6) low alloy steel plate, product name: carbon steel, material: s355jr, Beijing Huiteng Hanyu metal materials Co., Ltd.

editor's summary: about the classification of low alloy steel, let's briefly introduce it here first. Of course, we should also remind you that when you choose to buy, you must distinguish which type of low alloy steel they belong to. According to your own demand for steel, Make different choices. In addition, low alloy steel with reliable quality should be selected

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