Q345B Carbon Round Bar
Q345B steel round bar is a kind of steel, composed of Q+number+quality grade symbol+deoxygenation method symbol.Q345B belongs to low alloy high-strength structural steel, which is the most widely used steel grade with the largest output among the ordinary low alloy steels.The comprehensive performance of Q345B round stock steel is good, with good low-temperature performance, cold stamping performance, weldable performance and machinability performance. Widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. Q stands for the yield of this material, followed by 345, that is, the yield value of this material, at about 345. And will increase with the thickness of the material and make its yield value decreases.
q345B round bar stock chemical composition
|
C |
Mn |
Si |
P |
S |
V |
Nb |
Ti |
|
≤0.20 |
1.00-1.60 |
≤0.55 |
≤0.040 |
≤0.040 |
0.02-0.15 |
0.015-0.060 |
0.02-0.20 |
q345B round metal bar mechanical property
|
Thickness/diameter(mm) |
Tensile strength |
Yield strength |
|
≤16 |
470MPa-630MPa |
≥345MPa |
|
>16-≤35 |
≥325MPa |
|
|
>35-≤50 |
≥295MPa |
|
|
>50-≤100 |
≥275MPa |
Common steel round bar category,grade,sizes and standard
| Category | Grades | Sizes | Standard |
| Carbon structure steel | Q195, Q215, Q235, Q275 | 16mm-250mm | GB/T700-2006 |
| Low alloy high strength structure steel | Q295, Q345, Q390, Q420, Q460 | 16mm-250mm | GB/T1591-2008 |
| Prime Carbon structure steel | 10#, 20#, 35#, 45#, 60#, 20Mn, 65Mn, B2, B3, JM20, SH45,S45C, C45 | 16mm-250mm | GB/T699-1999 |
| Alloy structure steel | 30Mn2, 40Mn2, 27SiMn, 42Crmo, 20Cr,40Cr,20CrMo, 35CrMo, 20CrMnTi, 30CrMnTi, 20MnVB, 20MnTiB, 45MnV, 20CrNiMo, Q345B, 35MnBM,40MnB,36Mn2V, | 16mm-250mm | GB/T3077-1999 |
| Spring Steel | 65Mn, 60Si2Mn, 50CrVA | 16mm-250mm | GB/T1222-84 |
| Bearing Steel | GCr15, GCr15GD,55SiMoV | 16mm-250mm | GB/T18254-2002 |
| Structural steels subject to end-quench hardenability requirements | 20CrMnTi, 30CrMnTi, 20Cr, 40Cr, 30CrMo, 42CrMoA, 27SiMn, 40Mn2H, 20CrNiMo, 40Mn2, q345b,35MnBM, 40MnB,45MnV. | 16mm-250mm | GB/T5216-2004 |
| Oil wells structural steel | 37Mn5, 36Mn2V | 16mm-250mm | Q/LYS248-2007 |
| Marine anchor chain steel | CM490, CM690, M30Mn2 | 16mm-250mm | YB/T66-1987 |
| GB/T18669-2002 |
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