Carbon steel round bar

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.

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Carbon Steel Bar

Steel Bar

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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). 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.

Material	ASTM(1005,1006,1008,1010,1015,1020,1025,1030,1035,1040,1045,1050,1055,1060,1065,1070,1080,1084,1016,1022) DIN(Ck10,Ck15,Ck22,Ck25,Ck30,Ck35,Ck40,Ck45,Ck50, 30Mn4,40Mn4) BS(040A04,095M15,045M10,080A40,045M10,080M50)
Thickness	0.1mm-300mm or as required
Standard	AISI,ASTM,DIN,BS,JIS,GB,JIS,SUS,EN,etc.
Technique	Hot rolled,cold rolled
Surface Treatment	Clean, blasting and painting according to customer requirement
Thickness tolerance	±0.1mm
Application	It is mainly used to make structural parts such as car girder, beam, transmission shaft and car chassis parts, which can reduce the weight of the parts.
Shipment time	Within 7-25 workdays after receiving deposit or L/C
Export packing	Waterproof paper, and steel strip packed. Standard Export Seaworthy Package.Suit for all kinds of transport,or as required
Capacity	250,000 tons/year

Commonly used round steel grades and their chemical composition：

Steel Number	Chemical Composition, %					σs, MPa ≥
Steel Number	C	Mn	Si	S	P	σs, MPa ≥
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.

Grade	Level	Chemical Composition %					Deoxygenation Method	Use
		C	Mn	Si	S	P
				No greater than
Q195	-	0.06~0.12	0.25~0.50	0.30	0.050	0.045	F、b、Z	General bridges, building structures, general mechanical parts, such as screws, nuts, etc.
Q215	A	0.09~0.15	0.25~0.55	0.30	0.050	0.045	F、b、Z
	B				0.045
Q235	A	0.14~0. 22	0.30~0.65	0.30	0.050	0.045	F、b、Z
	B	0.12~0.20	0.30~0.70		0.045
	C	≤ 0.18	0.35~0.80		0.040	0.040	Z
	D	≤ 0.17			0.035	0.035	TZ
Q255	A	0.18~0.28	0.40~0.70	0.30	0.050	0.045	F、b、Z	It can be used for mechanical parts with large force, such as sprockets, tie rods, etc.
	B				0.045
Q275	-	0.28~0.38	0.50~0.80	0.35	0.050	0.045	b、Z

Deoxidation method: boiling steel F, semi-killed steel b, killed steel Z, special killed steel TZ

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