Quality carbon structural steel is introduced

Definition

Quality carbon structural steel (GB/T699-1999):

Steel in addition to containing carbon (C) elements and for deoxidizing and contains a certain amount of silicon (Si) (generally not more than 0.40%), manganese (Mn) (generally not more than 0.80%, higher to 1.20%) alloy elements, excluding other alloy elements (residual element except). This kind of steel must also ensure that the chemical composition and mechanical properties. The sulfur phosphorus (S), (P) the content of impurity elements in the general control 0.035%. If the control is in 0.030% person that senior high quality steel, the brand should add behind "A", for example, 20A; if P 0.025% control in the following, the S control is in 0.020% the following, called super high quality steel, the brand should add behind "E" to show the difference. For by raw material brought into other residual alloy elements in steel, such as chromium (Cr), nickel (Ni), copper (Cu) etc. the content general control in the Cr = 0.25%, Ni = 0.30%, Cu = 0.25%. Some grades of manganese (Mn) content reached 1.40%, known as manganese steel.

This kind of steel is to rely on the adjustment of carbon (C) to improve the mechanical properties of steel, therefore, according to the carbon content of the steel, this can be divided into:

Low carbon - carbon content is generally less than 0.25%, such as 10, 20 steel etc.;

Medium carbon - carbon content in general 0.25 ~ 0.60%, such as 35, 45 steel etc.;

High carbon steel -- the carbon content is generally greater than 0.60%. This kind of steel is generally not used in the manufacture of steel pipe.

In fact, they are between the carbon content and no clear boundaries.

This kind of steel production is large, wide purpose, generally more rolling (forging) made of round, square, flat and profiles, sheet and seamless steel pipe. Mainly used in the manufacture of general structure and mechanical structure parts, components and structural parts and pipes conveying fluid. According to the use requirements, sometimes requiring heat treatment (normalizing or quenching and tempering) after use.

Classification

Quality carbon structural steel according to the different carbon content can be divided into three categories: low carbon steel (C = 0.25%), carbon steel (C 0.25-0.6%) and high carbon steel (C>

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Dear friends, I am glad to receive your mail, we will give you the tracking number in the time in October 14th, in October 16th the goods by customs returned, in October 16th we re transport, this is the new tracking number,

0.6%).

Quality carbon structural steel is divided into normal manganese content in manganese containing different amount (containing manganese 0.25%-0.8%) and high content of manganese (Mn containing 0.70%-1.20%) two group, the latter has the mechanical performance and good processing performance.

1, hot rolled quality carbon structural steel sheets and strips

Hot rolled quality carbon structural steel plates and strips for automobile, aviation industry and other parts. The grade of steel boiling steel: 08F, 10F, 15F; killed Steels: 08, 08AL, 10, 15, 20, 25, 30, 35, 40, 45, 50. The following 25 and 25 for low carbon steel 30 and more than 30 for the medium carbon steel.

2, hot rolled quality carbon structural steel plates and wide strips

Hot rolled quality carbon structural steel plates and wide strips used for various mechanical parts. The grade of steel is low carbon steel include: 05F, 08F, 08, 10F, 10, 15F, 15, 20F, 20, 25, 20Mn, 25Mn; medium carbon steel include: 30, 35, 40, 45, 50, 55, 60, 30Mn, 40Mn, 50Mn, 60Mn etc.; high carbon steel including: 65, 70, 65Mn.

Use

The content of sulfur and phosphorus quality carbon structural steel is less than 0.035%, mainly used in the manufacture of parts is more important. In the project is generally used for steel wire, steel strand and anchorage of prestressed concrete production, and high strength bolts, important structural steel castings.

Full of responsibility and do not break free, full of compatible without losing individuality. For example, the number 20 represents the average steel carbon content of 0.20% high quality carbon steel. For the boiling steel in the rear plus F, such as 10F, 15F etc.. 08, 10, 15, 20, 25 grades and belongs to the low carbon steel, which has good plasticity, easy drawing, stamping, extrusion, forging and welding.

Quality carbon structural steel in 08, 10, 15, 20, 25 grades and belongs to the low carbon steel, which has good plasticity, easy drawing, stamping, extrusion, forging and welding. The most widely used of the 20 steel, used to manufacture screws, nuts, washers, a small shaft, stamping parts, welding parts, sometimes also used in the manufacture of carburized parts. 30, 35, 40, 45, 50, 55 grades is medium carbon steel, because of increased steel pearlite content, its strength and hardness are improved than before, after quenching hardness can be increased significantly. Among them, with 45 steel is the most typical, it not only strength, high hardness, and has better plasticity and toughness, namely excellent comprehensive properties. 45 steel uses in the mechanical structure of the most widely used to manufacture, screw, shaft, gear, a connecting rod, a sleeve, keys, an important screws and nuts etc.. 60, 65, 70, 75 grades belong to high carbon steel. They not only after quenching and tempering strength and hardness, and excellent elasticity, used to manufacture a small spring, spring, steel wire rope, such as roller.