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Q345 STEEL SPECIFICATION AND EQUIVALENT STANDARD

Publisher:TianchengTime:2018-07-01Number:127

Q345 STEEL SPECIFICATION AND EQUIVALENT STANDARD

SS400 Heavy Steel Plate Q345 Alloy Steel Plate
SS400 Hot Rolled Checkered PlateQ345 Heavy Steel Plate
SS400 Carbon Steel PipeQ345 Seamless Alloy Steel Pipe









Q345 steel specification: Q345 steel belongs to 16Mn steel grade, usually it is produced in hot rolled state, hot rolled steel plate, hot rolled steel coil/sheet, it has comprehensive mechanical and welding property, as it shows good performance in structural purposes, it is widely used as welding structural part in manufacturing of ship, railway and vehicles, bridges, boiler, pressure vessel container, steel oil tank, etc. Yield point of Q345 steel plate decreases as plate thickness increases.

Q345 steel properties: welding property of Q345 steel is occasionally questioned by end users, although welding property is mainly affected by its chemical content, its production technology has been improved after all those years of research, and has been proved to be one excellent steel standard for steel structure purposes, you can contact us if there’s any doubt in your mind.  

Application difference Q345 - Q235:
As Q345 and Q235 alloy element content is different, their applications are quite different.  

  • Q235 carbon structural steel is made for metal construction that doesn’t have high demand for steel strength, tie rod, connecting rod, hook, coupler, bolt and nut, sleeve, shaft and welding parts.

  • Q345 is low alloy structural steel with good mechanical properties, low temperature performance, plasticity and good weldability, it is mostly used in low pressure vessel, oil tank, vehicles, cranes, mining machinery, power stations, mechanical parts, building structure, general metal parts, Q345(E) steel plate is always delivered in hot rolled or normalizing state, can be used in areas where its temperature is above -40 ℃.


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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