Classification of low alloy steel low alloy steel prices and manufacturers recommended
Since the 1970s of the last century, the steel industry in China has been rapidly and completely developed. Now, it is an architectural and industrial material that is indispensable in China. According to the difference in the mass fraction of the elements contained in the steel, we classify steel into alloy steel and non-alloy steel. Low-alloy steel He is to change the performance of the steel, so that in addition to other carbon steel on the basis of other different alloys, thus forming a steel. With low alloy steels, it means that the total amount of alloy is less than 5%. So how do you know about low alloy steel classification ? Today, I introduced the classification of alloy steels for everyone, and I hope that through the following introduction, everyone will have a new understanding of the classification of low-alloy steels .
Low alloy steel profile
Alloy steel is relative to carbon steel. Based on carbon steel, we add one or more alloy elements to it to continue processing to improve certain properties of steel. Among them, alloy steels with a low content of alloy elements (less than or equal to 5%) are low alloy steels. In general, after the addition of alloying elements, the properties of the steel in terms of strength, hardness, plasticity, weldability, corrosion resistance, etc., can be greatly improved to meet our specific requirements for steel in some occasions.
Low alloy steel classification
The classification of low-alloy steels includes ordinary-quality low alloy steels, high-quality low-alloy steels and special-quality low-alloy steels.
First, ordinary quality low alloy steel
First of all, we introduce ordinary quality low-alloy steel. This kind of low-alloy steel with normal quality means that there is no special requirement on this problem during the production process. At the same time, its alloy content is relatively low, and heat treatment is not specified at the same time. The highest value of sulfur and phosphorus in ordinary-quality low-alloy steel is 0.045% or more. Its minimum tensile strength is less than or equal to 690 MPa, its minimum elongation is less than or equal to 26%, the minimum value of the yield point or yield strength is less than or equal to 360 MPa, the minimum value of impact energy is less than or equal to 27 J, and the minimum value of the bending center diameter Greater than or equal to 2 x sample thickness.
Second, high-quality low alloy steel
Next, we will introduce high-quality low-alloy steel. This material refers to the need for special emphasis on quality issues in the production process. For example, it is necessary to reduce its sulfur and phosphorus content during production, and it is also necessary to control its grain size 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, and low-alloyed steel for bridge construction. And bicycles, low-alloy steels used, railway low-alloy steels, and low-alloy steels used in oil and gas transmission pipelines.
Third, special quality low alloy steel
Finally, we will introduce the special quality of low alloy steel. This kind of material steel means that in the process of producing it, it has been strictly controlled in terms of performance and quality, and the control on sulfur, phosphorus and other impurities is particularly strict, thereby increasing its purity.
Low Alloy Steel Standard
First, the industry name standard
1. The first two digits of the steel number indicate the average carbon content, and the unit of magnitude is one ten-thousandth. For example, 40Cr means that the average carbon content in steel is 40/10000.
2. In steel, the expression of alloying elements is generally expressed in order of magnitude. When the mass fraction of the alloy is less than 1.5%, the content may not be indicated but only the alloying elements. If you want to avoid confusion between different elements, you can also mark 1 later.
3. Some microalloying elements in the steel, such as rare earth elements, vanadium, boron, etc., no matter what the content, should be specified in the steel number.
4. If the steel is a high-quality steel, the letter A should be added at the end of the steel to distinguish it from ordinary high-grade steel.
5. The low-alloy steel with a specific purpose should show the corresponding serial number at the very end to show its use.
Second, the high yield strength standard
In order to achieve a certain yield strength, the content of certain alloying elements in the steel also has a certain standard. For example, in high-quality low-alloy steels, the minimum content of aluminum is 0.1%, lead is 0.4%, cobalt, niobium is 0.1%, boron is 0.008%, and silicon is 0.5. %.
Among them, there is another kind of solderable fine-grain structural steel with the following additional requirements:
1. The thickness of the steel should be less than or equal to 16.0 mm, and the minimum yield strength must not exceed 420 MPa.
2. The minimum of alloying element content should be consistent with the above.
3. When the alloy steel contains multiple limit elements, the content requirements of these elements should be satisfied separately, and ensure that the comprehensive content is equal to 70% of the sum of the various limit element contents.
Factors affecting the price of low alloy steel
The price of low-alloy steel is mainly affected by its product name, specifications and manufacturers. In addition, the material of low-alloy steel, how much the batch size, time, and other factors can also affect the price to some extent. As far as volume is concerned, some low-alloy steels are purchased in large quantities and there will be preferential prices.
Low alloy steel manufacturers
(1) Low-alloy round steel, product name: joint steel, material: 16mn, Dongguan Changan Shenyou Metal Material Sales Department
(2) Low-alloy steel, product name: joint 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 Aohao Metal Materials Co., Ltd.
(4) Low-alloy steel, product name: low-alloy round steel, material quality: Q345E, Wuxi Ngaute Steel Co., Ltd.
(5) Low-alloy steel, product name: Cold-rolled high-strength steel, Material: B220IS, Specification: 0.84×1350×C, Shanghai Suyi Industrial Co., Ltd.
(6) Low-alloy steel plate, product name: carbon steel, material: S355JR, Beijing Huiteng Hanyu Metal Materials Co., Ltd.
Editor's summary: Regarding the classification of low-alloy steel, we first introduce it to you here. Of course, we must also remind everyone to choose what to buy at the same time, be sure to distinguish what kind of low-alloy steel they belong to, according to their own The needs of different options. In addition, choose low-alloy steel with reliable quality.
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