High Quality Low-Alloy High-Strength Carbon Steel Sheets Q345 (16Mn)

Introduction

Q345 (formerly known as 16Mn) is a widely used low-alloy high-strength structural steel in China, conforming to the standard GB/T 1591. It belongs to the Q345 series (where "Q" denotes yield strength, "345" indicates a minimum yield strength of 345 MPa). The designation "16Mn" historically referred to its manganese content (~1.2–1.6%), though the standard has since been updated to Q345.

 

The typical chemical composition of Q345 steel (16Mn) includes:

 

Element	Content (%)
Carbon (C)	≤0.20
Manganese (Mn)	1.00–1.60
Silicon (Si)	0.20–0.55
Phosphorus (P)	≤0.040
Sulfur (S)	≤0.040
Alloy Additives (optional)	V, Nb, Ti (to improve strength and hardenability)

 

Note: Specific compositions may vary slightly by manufacturer and application requirements.

 

 

 

 

 

 

Applications

Q345 steel is widely used in:

 

Structural Components: Buildings, bridges, and industrial frameworks.

Machinery and Equipment: Heavy machinery parts, agricultural equipment, and vehicle frames.

Pressure Vessels: Tanks, boilers, and pipelines (meets requirements for moderate pressure applications).

Transportation: Railway carriages, shipbuilding, and offshore structures.

Storage Systems: Steel storage tanks and containers.

 

 

 

 

 

 

 

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Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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