C45 41CR4 25CRMO4 Carbon Steel Bars - 图片 2

C45 41CR4 25CRMO4 Carbon Steel Bars - 图片 3

C45 41CR4 25CRMO4 Carbon Steel Bars

Carbon steel bar is a kind of solid long steel, and the common ones are round steel, square steel, hexagonal steel, octagonal steel, etc. Round steel is often used to make steel bars, bolts and various mechanical parts, as well as billets for seamless steel pipes. Square steel refers to steel that is rolled or processed into a square section, which can be divided into hot-rolled and cold-rolled.

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Carbon steel round bar is a solid long steel bar with a circular cross-section. Its specifications are expressed in diameter in millimeters (mm). The calculation formula of theoretical weight of round steel: outer diameter Х outer diameter Х0.00617=kg/m. Round bars are divided into three types: hot rolled round bars, forged round bars and cold drawn round bars according to the process section. According to the chemical composition (ie carbon content), it can be divided into low carbon steel round steel, medium carbon steel round steel and high carbon steel round steel. According to the quality of steel, it can be divided into ordinary carbon steel round steel and high-quality carbon steel round steel. According to the use, it can be divided into carbon structural steel and carbon tool steel.

Classification of carbon steel:

According to the application, carbon steel can be divided into three categories: carbon structural steel, carbon tool steel and free-cutting structural steel. Carbon structural steel can be divided into building structural steel and machine-made structural steel. According to the carbon content, carbon steel can be divided into low carbon steel (ωc≤0.25%), medium carbon steel (ωc=0.25%-0.6%) and high carbon steel (ωc>0.6%)

According to the amount of phosphorus and sulfur, carbon steel can be divided into ordinary carbon steel (higher phosphorus and sulfur), high-quality carbon steel (lower phosphorus and sulfur) and advanced high-quality steel (lower phosphorus and sulfur) Generally, the higher the carbon content in carbon steel, the higher the hardness and the higher the strength, but the lower the plasticity.

Steel Number	Chemical Composition, %					σs, MPa ≥
Steel Number	C	Mn	Si	S	P
08F	0.05-0.11	0.25-0.50	≤0.03	<0.035	<0.035	175
10	0.07-0.13	0.35-0.65	0.17-0.37	<0.035	<0.035	205
20	0.17-0.23	0.35-0.65	0.17-0.37	<0.035	<0.035	245
35	0.32-0.39	0.50-0.80	0.17-0.37	<0.035	<0.035	315
40	0.37-0.44	0.50-0.80	0.17-0.37	<0.035	<0.035	335
45	0.42-0.50	0.50-0.80	0.17-0.37	<0.035	<0.035	355
50	0.47-0.55	0.50-0.80	0.17-0.37	<0.035	<0.035	375
60	0.57-0.65	0.50-0.80	0.17-0.37	<0.035	<0.035	400
65	0.62-0.70	0.50-0.80	0.17-0.37	<0.035	<0.035	420

08-25 steel has low carbon content, low strength and hardness, good plasticity, toughness and weldability. It is mainly used to manufacture stamping parts, welded structural parts and mechanical parts with low strength requirements.

30-55 belongs to quenched and tempered steel, which has good comprehensive mechanical properties after being quenched and tempered, and is mainly used to manufacture mechanical parts with greater stress.

The steel above 60 belongs to spring steel, which can obtain a higher elastic limit after heat treatment, and is mainly used for the manufacture of elastic parts.