rief Introduction Of Low Alloy High Strength Steel 16Mn
Many steel material buyers purchase steel plate in China, especially high strength low alloy steel. 16Mn is kind of C-Mn steel, its carbon content is from 0.1% to 0.25% and with some alloy elements such as manganese (Mn), silicon (Si), vanadium (V), niobium (Nb), titanium (Ti) and other elements. 16 Mn is a kind of low alloy steel with large output and the most extensive application. This kind of steel can be used as the alternative material of many kinds of steel.Today we introduce 16Mn as your reference for purchasing steel plate in China.
As a old Chinese standards, 16Mn is edited from GB 1591-1988 "low alloy structural steel", has now been replaced by Q345. Low alloy steel Q345 steel has 5 quality grades, which are represented by from Q345A to Q345E. It can be said that Q345 steel is the substitution of old brand steel of 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn and other steel types, rather than only 16Mn steel. Their corresponding foreign maters are showed below:
GB
ASTM
JIS
EN
DIN
Q345A
Grade 50
SPFC 590
E335(St 52-3)
1.0060
Q345B
Grade 50
SPFC 590
S355JR
1.0045
Q345C
Grade 50
SPFC 590
S355JO
1.0553
Q345D
Grade 50
SPFC 590
S355J2
1.0577
Q345E
Grade 50
SPFC 590
S355NL
1.0546
What’s The Difference Between 16Mn And Q345?
The chemical element of Q345 steel is basically the same as that of 16Mn steel. The difference lies in the addition of Ti, Nb and V micro alloying elements, which can refine grain, improve toughness, and finally improve the mechanical properties of steel. In other words, the comprehensive mechanical properties of Q345 steel are better than that of 16Mn steel, especially its low temperature performance and allowable stress.
Standards comparison
16Mn
GB 28883-2012 Composite seamless steel pipe for pressure application
NB/T 47008-2010 Carbon steel and alloy steel forgings for pressure equipment
GB 6479-2000 Seamless steel pipe for high pressure fertilizer equipment
GB 1591-1988 Low alloy structural steel
Q345
GB/T 1591-2008Low alloy and high strength structural steel
Chemical composition comparison
Steel
C
Si
Mn
P
S
Cr
Ni
Cu
Nb
V
Ti
N
Mo
16Mn
0.12~0.20
0.20~0.55
1.20~1.60
≤0.045
≤0.045
≤0.30
≤0.30
≤0.30
/
/
/
/
/
Q345B
≤0.20
≤0.50
≤1.70
≤0.035
≤0.035
≤0.30
≤0.50
≤0.30
≤0.07
≤0.15
≤0.20
≤0.012
≤0.10
16Mn is a typical grade of low alloy high strength steel, mainly including 16Mn steel plate, 16Mn seamless tube and 16Mn forgings, they are widely used in the manufacture of medium and low pressure vessels and oil tanks as well as general mechanical structural parts.
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