Round steel refers to a solid long steel bar with a circular cross-section. Its specifications are expressed in diameter in millimeters (mm). For example, “50mm” means round steel with a diameter of 50 mm.

According to process classification, it is divided into three types: hot rolling, forging and cold drawing. The specifications of hot-rolled round steel are 5.5-250 mm.
Among them: small round steel of 5.5-25 mm is mostly supplied in straight strips and bundles, and is commonly used as steel bars, bolts and various mechanical parts;
Round steel larger than 25 mm is mainly used to manufacture mechanical parts, seamless steel pipe blanks, etc.

According to the chemical composition, it can be divided into low carbon steel, medium carbon steel and high carbon steel.

According to use, it can be divided into carbon structural steel and carbon tool steel.

The materials of round steel are: Q195, Q235, 10#, 20#, 35#, 45#, Q215, Q235, Q345, 12Cr1Mov, 15CrMo, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrMo, 42CrMo, 40CrNiMo, GCr15, 65Mn, 50Mn, 50Cr, 3Cr2W8V, 20CrMnTi, 5CrMnMo, etc.

Comply with (GB699-1988, GB700-1988, GB3077-1988, GB702-1986, QJ/HG02.17-1991) standards:

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Matériel

Specification

Matériel

Specification

8#-10#

∮16-290

65Mn

∮40-300

15#

∮14-150

45Mn2

∮18-75

20#

∮8-480

60Si2Mn

∮16-150

35#

∮8-480

20CrMnTi

∮10-480

45#

∮6.5-480

20crmnTiB

∮16-75

Q235B

∮6.5-180

GCr15

∮16-400

40Cr

∮8-480

ML35

∮8-150

20Cr

∮10-480

T8-T13

∮8-480

42CrMo

∮12-480

Cr12

∮16-300

35CrMo

∮12-480

Cr12MoV

∮16-300

20CrMo

∮12-300

3Cr2W8V

∮16-300

38CrMoAL

∮20-300

45Cr50Cr

∮20-300

5CrMnMo

∮20-450

20CrMnMo

∮20-300

16Mn(Q345B)

∮14-365

40Mn2

∮28-60

50Mn

∮40-200

35Cr

∮55

15CrMo

∮21∮24∮75

15Mn

∮32∮170

25#

∮16-280

40CrMnMo

∮80-∮160

YF45MnV

∮28-80

20CrMnMo

∮20-300

30#

∮6.5-480

27 SiMn

∮20-350

30Crmo

∮28

Crwmn

∮20-300

30CrmnTi

∮16-300

H13(4Cr5MoSiVi)

∮20-300

60#

∮210.∮260

40crNimo

∮20-400

The difference between round steel and other steel bars:
1. The appearance is different. The round steel has a smooth round shape with no lines or ribs. The surface of other steel bars has grooves or ribs. This results in a small bonding force between the round steel and the concrete, while the bonding force between the other steel bars and the concrete is small. Great adhesion.

2. The composition is different. Round steel (first-grade steel) is ordinary low carbon steel, while other steel bars are mostly alloy steel.

3. The strength is different. Round steel has low strength, while other steels have high strength. That is, compared with other steel bars, round steel with the same diameter can withstand less tensile force than other steel bars, but the plasticity of round steel is smaller than that of other steel bars. Strong, that is, the round steel has a larger deformation before being pulled off, while the deformation of other steel bars before being pulled off is much smaller.