Q345 pipe material standard for fluid water

The material Q345 in fluid pipe in GB8163 there have three grade: Q345A,Q345B and Q345C. Q345 is also called 16Mn.
The component analysis is as the following:

Grade

Chemical Component /％

C

Si

Mn

Cr

Mo

V

Ni

Ti

Nb

Cu

N

P

S

Q345A

≤0.20

≤0.50

≤0.17

≤0.30

≤0.10

≤0.15

≤0.50

≤0.20

≤0.07

≤0.30

≤0.012

≤0.030

≤0.030

Q345B

≤0.20

≤0.50

≤0.17

≤0.30

≤0.10

≤0.15

≤0.50

≤0.20

≤0.07

≤0.30

≤0.012

≤0.030

≤0.030

Q345C

≤0.20

≤0.50

≤0.17

≤0.30

≤0.10

≤0.15

≤0.50

≤0.20

≤0.07

≤0.30

≤0.012

≤0.030

≤0.030

 
The mechanical analysis is as the following:

Grade	Normical THK mm	Tension Test			Impact Test		Hardness Test
		R    Mpa	R   Mpa	A      ％	Test temperature ℃	KV J	HBW
Q345A	≤16	470~830	≥345	≥20
Q345B	≤16	470~630	≥345	≥20	20	≥34
Q345C	≤16	470~630	≥345	≥21

 
Q345 or 16Mn in alloy steel pipe fittings the chemical and mechanical is as the following:

Grade	Chemical Component /％
	C	Si	Mn	Cr	Ni	Cu	P	S
16Mn	0.13~0.20	0.20~0.60	1.20~1.60	≤0.30	≤0.30	≤0.25	≤0.030	≤0.020

 
The chemical standard

Grade	Normical THK mm	Tension Test			Impact Test		Hardness Test
		R    Mpa	R   Mpa	A      ％	Test temperature ℃	KV J	HBW
16Mn	≤100	480~630	≥305	≥20	0	≥34	128~180

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