Q345B Carbon Steel Pipe

Q345B Carbon Steel Pipe is a low-alloy high-strength structural steel pipe widely used in engineering and construction applications. It is produced according to GB/T 1591 (steel grade standard) and commonly manufactured under GB/T 8162, GB/T 8163, and GB/T 3091 pipe standards.

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Wuxi Jin Ming Jian De Industry & Trade Co., Ltd. is one of the leading manufacturers and suppliers of q345b carbon steel pipe in China. If you're going to wholesale the newest q345b carbon steel pipe made in China, welcome to get pricelist from our factory. All customized products are with high quality and competitive price.

Compared with Q235 and Q195, Q345B offers significantly higher strength, better load-bearing capacity, and good toughness, while still maintaining acceptable weldability and processing performance. It is one of the most commonly used structural steel grades in China's industrial and construction sectors.

Equivalent Grades:

Country	Standard	Grade
China	GB/T 1591	Q345B
USA	ASTM	A572 Grade 50 / A992 (Comparable)
Europe	EN	S355JR / S355J2
Japan	JIS	SM490
Russia	GOST	09G2S

Chemical Composition:

Element	Content (%)
Carbon (C)	≤ 0.20
Silicon (Si)	≤ 0.50
Manganese (Mn)	1.00 – 1.60
Sulfur (S)	≤ 0.040
Phosphorus (P)	≤ 0.040

Mechanical Properties:

Property	Value
Yield Strength	≥ 345 MPa
Tensile Strength	470 – 630 MPa
Elongation	≥ 21%

Q345B Carbon Steel Pipe (GB/T 1591 / GB/T 8162 / GB/T 8163 / GB/T 3091) is a high-strength structural steel pipe with yield strength ≥345 MPa, offering excellent strength, toughness, and weldability. It is equivalent to ASTM A572 Grade 50 / EN S355JR / JIS SM490 / GOST 09G2S, and is widely used in construction, engineering, and heavy structural applications.

Q345B Carbon Steel Pipe is widely used in: