Large Square Billet 200x200mm Q345B

Large Square Billet 200x200mm Q345B - Image 3

Large Square Billet 200x200mm Q345B

This Large Square Billet 200x200mm Q345B is designed with its specific chemical and mechanical properties to be suitable for a wide range of structural applications. The square shape and given size make it convenient for further processing into various desired components. Its balanced characteristics ensure its performance and reliability in different engineering projects.

2010 ESTABLISHED

410 EMPLOYEE

363+CLIENTS

13000+ trade

Why Choose Baosteel®

Product details

The Large Square Billet 200x200mm Q345B is a robust low-alloy high-strength steel product engineered to meet the demands of large-scale structural fabrication and heavy machinery manufacturing. Compliant with GB/T 1591-2008 standards, this 200x200mm square billet combines exceptional strength, formability, and weldability, making it an ideal raw material for creating durable, load-bearing components in construction, infrastructure, and industrial projects.

Parameter	Value	Remarks
Standard	GB/T 1591-2008	Low alloy high-strength structural steel standard
Grade	Q345B	Impact tested at 20℃
Chemical Composition (wt%)
– Carbon (C)	≤0.20	To ensure good weldability and formability
– Silicon (Si)	≤0.55	Helps in deoxidation and influences strength and toughness
– Manganese (Mn)	≤1.70	Enhances strength and toughness of the billet
– Phosphorus (P)	≤0.040	Kept at low level to avoid embrittlement
– Sulfur (S)	≤0.040	Low content for better quality and performance
– Niobium (Nb)	≤0.07	Microalloying element for grain refinement
– Vanadium (V)	≤0.15	Improves strength and heat resistance properties
– Titanium (Ti)	≤0.20	Aids in enhancing toughness and structural stability
– Nitrogen (N)	≤0.012	Controlled to prevent nitrogen-induced embrittlement
Mechanical Properties
– Yield Strength (ReL)	≥345 MPa	For sections within relevant size range including this square billet; crucial for withstanding load
– Tensile Strength (Rm)	470–630 MPa	Ensures the overall structural integrity under various loading conditions
– Elongation (A)	≥21%	Provides necessary ductility for possible deformation during processing or usage
– Impact Energy (Akv)	≥34 J	At 20℃ (longitudinal specimen), important for resisting sudden impact and avoiding brittle fracture
– Bending Test	180°	Bend diameter: 2a for ≤16mm; 3a for >16mm (where ‘a’ represents the relevant dimension like thickness or side length in appropriate cases), relevant for fabrication processes
Dimensions	200 x 200 mm (square cross-section)	Standard nominal size; there may be allowable tolerance ranges in actual production
Length	Customizable according to specific requirements	Usually supplied in certain lengths as per customer orders
Surface Quality	Generally required to be free from cracks, surface defects like deep scratches, etc.	To meet the quality standards for further processing or application
Delivery Condition	Hot rolled, normalized, normalized + tempered, TMCP (Thermo-Mechanical Control Process)	Based on specific manufacturing and usage demands
Typical Applications	Structural components in construction, bridges, heavy machinery frames, and other applications where high strength and good formability are needed