GB T3091 welded steel tube

GB T3091-Q345/Q235/S355 welded steel pipes are ideal for low pressure liquid delivery. The advantages of our company is first-class quality, short delivery time, competitive offer and professional service. To keep long term cooperation with all our clients is the most important thing to our company. We treat every order form meticulously, proceed from the customer's interests constantly, in order to meet 100% of the customer satisfaction.

GB T3091 Size

Seamless Steel Pipe	ERW Steel Pipe	LSAW Steel Pipe	SSAW Steel Pipe
1/4"~30"	1/8"~26"	12"~56"	8"~80"
3~40mm	1.8~12mm	6~60mm	6~25mm
ASTM A53, ASTM A106, API 5L, EN, DIN, JIS, BS, AWWA, etc.
GR.A ~ GR.D, X42 ~ X70, S275, S275JR, S355JR, S355JOH, etc.

GB T3091-Q345D Inspection Certificate

Q345 Steel Chemical Composition:

Steel Standard	Steel Grade	Chemical Composition
Steel Standard	Steel Grade	C≤	Mn	Si≤	P≤	S≤	V	Nb	Ti	Al≥
Q345	A	0.020	1.00~1.60	0.55	0.045	0.045	0.02~0.15	0.015~0.060	0.20	-
	B	0.020	1.00~1.60	0.55	0.040	0.040	0.02~0.15	0.015~0.060	0.20	-
	C	0.020	1.00~1.60	0.55	0.035	0.035	0.02~0.15	0.015~0.060	0.20	0.015
	D	0.020	1.00~1.60	0.55	0.030	0.030	0.02~0.15	0.015~0.060	0.20	0.015
	E	0.020	1.00~1.60	0.55	0.025	0.025	0.02~0.15	0.015~0.060	0.20	0.015

Q345 Steel Mechanical Property:

Steel Standard	Steel Grade	Yield Strength Mpa	Tensile Stregth Map	Elongation %
Q345	A	345	470~630	21
	B	345	470~630	21
	C	345	470~630	22
	D	345	470~630	22
	E	345	470~630	22

Chemical Composition Comparision of Q345/Q235/S355:

Steel Grade	C	Si	Mn	P	S
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

Mechenical Property Comparision of Q345/Q235/S355:

Steel Grade	Tensile strength	Yield strength	Elongation afrer fracture
S355	450-630Mpa	≥355MPa	21-22%
S500MC	550-700Mpa	≥500MPa	≥12%
Q345B	490-675Mpa	≥345Mpa	≥21%
Q235B	375-500Mpa	≥235Mpa	≥26%

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