SSAW Spiral Welded Pipes Q345C Material

SSAW Spiral Welded Pipes Q345C Material

The material difference of Q345A, Q345B,Q345C, Q345D and Q345E Q345 is a kind of steel material. It is a low alloy steel (C<0.2%),widely used in bridges, vehicles, ships, buildings, pressure vessels, etc.. Q represents the yield of this kind of material, the 345 refers to the yieldvalue of...

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The material difference of Q345A, Q345B,Q345C, Q345D and Q345E

Q345 is a kind of steel material. It is a low alloy steel (C<0.2%),widely used in bridges, vehicles, ships, buildings, pressure vessels, etc.. Q represents the yield of this kind of material, the 345 refers to the yieldvalue of this material, in the 345 or so. And the yield value decreases with the increase of the thickness of the material. Q345A, Q345B, Q345C, Q345D and Q345E is a class distinction, represented by the temperature, mainly temperature shocks are different, each class interval of 20 degrees Celsius, and Q345A level is no impact temperature request; Q345B  is 20 degrees ambient temperature impact; Q345C is 0 degrees impact;  Q345D grade is 20 degrees below zero;  Q345E, is - 40degrees of impact.  At different impact temperatures, the impact values are also different. It is belong to a low alloy series in steel plate.



Q345 Steel Chemical Composition:

Steel StandardSteel GradeChemical Composition
C≤MnSi≤P≤S≤VNbTiAl≥
Q345A0.0201.00~1.600.550.0450.0450.02~0.150.015~0.0600.20-
B0.0201.00~1.600.550.0400.0400.02~0.150.015~0.0600.20-
C0.0201.00~1.600.550.0350.0350.02~0.150.015~0.0600.200.015
D0.0201.00~1.600.550.0300.0300.02~0.150.015~0.0600.200.015
E0.0201.00~1.600.550.0250.0250.02~0.150.015~0.0600.200.015
 

Q345 Steel Mechanical Property:

Steel StandardSteel GradeYield Strength MpaTensile Stregth MapElongation %
Q345A345470~63021
B345470~63021
C345470~63022
D345470~63022
E345470~63022

Mechenical Property Comparision of Q345/Q235/S355:

Steel GradeTensile strengthYield strengthElongation afrer fracture
S355450-630Mpa≥355MPa21-22%
S500MC550-700Mpa≥500MPa≥12%
Q345B490-675Mpa≥345Mpa≥21%
Q235B375-500Mpa≥235Mpa≥26%

Chemical Composition Comparision of Q345/Q235/S355:

Steel GradeCSiMnPS
S355≤0.22≤0.55≤1.60≤0.025≤0.025
S500MC≤0.12≤0.50≤1.70≤0.025≤0.015
Q345B≤0.20≤0.50≤1.70≤0.035≤0.035
Q235B≤0.20≤0.35≤1.40≤0.045≤0.045

Q345 Steel Equivalent Standard(ASTM/EN/JIS):

Steel for boiler and other pressure vesselsGB 713-2008
ASTM A537-08
JIS G3115
Q245R (20g/20R); Q345R (16Mng/16MnR)
Class 1/2/3
SPV235; SPV315; SPV355
High strength low alloy structural steelGB/T 1591-2008
EN 10028-3-2003
EN 10025-2004
ASTM A572-07
ASTM A588-05
Q345 (A/B/C/D/E); Q390; Q420
P355N
S420N
Grade 50; Grade 60
Grade A; Grade B


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