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GB/T 3091

The steel pipe is electrically welded in accordance with GB/T 3091 standard, which can be bent, crimped and similarly shaped, and is also suitable for welding.

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GB/T 3091

The steel pipe is electrically welded in accordance with GB/T 3091 standard, which can be bent, crimped and similarly shaped, and is also suitable for welding.

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WhatsApp:

Still deciding? Get samples first, Contact US !

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GB/T 3091

Description

Product Description

The steel pipe is electrically welded in accordance with GB/T 3091 standard, which can be bent, crimped and similarly shaped, and is also suitable for welding. Carbon steel pipe material grades (chemical composition) are Q195, Q215A/B, Q235A/B, Q295A/B, Q345A/B, etc. They are manufactured by high-frequency resistance welding (ERW), straight-seam submerged-arc welding (SAWL) or spiral submerged-arc welding (SAWH).

Product Size

Outer diameter: 21.3～1930mm
Wall thickness: 6.00～70.00mm
End: flat end, beveled
Length: 3～12 meters or SRL, DRL, double feet and fixed feet.

Packaging

Outer surface coated with oil or clear/black paint, also hot-dip galvanized, bundled with steel straps.

Chemical composition

	C	Si	Mn	P	S	Cr	Ni	Cu	V	Nb	Ti
	≤，%			≤，%
Q195	0.12	0.30	≤0.50	0.035	0.040	0.30	0.30	0.30
Q215A	0.15	0.35	≤1.20	0.045	0.050	0.30	0.30	0.30
Q215B	0.15	0.35	≤1.20	0.045	0.045	0.30	0.30	0.30
Q235A	0.22	0.35	≤1.40	0.045	0.050	0.30	0.30	0.30
Q235B	0.20	0.35	≤1.40	0.045	0.045	0.30	0.30	0.30
Q295A	0.16	0.55	0.80～1.50	0.045	0.045	0.30	0.30	0.30	0.02～0.15	0.015～0.060	0.02～0.20
Q295B	0.16	0.55	0.80～1.50	0.045	0.045	0.30	0.30	0.30	0.02～0.15	0.015～0.060	0.02～0.20
Q345A	0.20	0.55	1.00～1.60	0.045	0.045	0.30	0.30	0.30	0.02～0.15	0.015～0.060	0.02～0.20
Q345B	0.20	0.55	1.00～1.60	0.040	0.040	0.30	0.30	0.30	0.02～0.15	0.015～0.060	0.02～0.20

Product Mechanical Properties

	Tensile strength ≥, MPa	Yield strength ≥, MPa		Elongation after break ≥, %
	Tensile strength ≥, MPa	thickness≤16mm	thickness＞16mm	outer diameter≤168.3mm	outer diameter＞168.3mm
Q195	315	195	185	15	20
Q215A	335	215	205	15	20
Q215B	335	215	205	15	20
Q235A	370	235	225	15	20
Q235B	370	235	225	15	20
Q295A	390	295	275	13	18
Q295B	390	295	275	13	18
Q345A	470	345	325	13	18
Q345B	470	345	325	13	18

Application range
Usually used in the construction of piping for the transportation of low-pressure fluids such as water, air, heating steam, and gas.

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