JIS G3106 SM400A SM400B Hot Rolled Carbon Structure Steel Plate

Product Description

Run your hand over the plate’s smooth, matte black surface—free of burrs, pits, or uneven rolling marks—and feel the dense, uniform texture shaped by advanced hot-rolling technology. The steel’s consistent thickness and flatness (achieved through precision mill controls) mean it lies flush during assembly, reducing gaps that can weaken welds. When welded, it responds with remarkable ease: no brittle spatter, no cracking, even for novice fabricators—thanks to its optimized carbon content (≤0.20%) and low impurity levels. This isn’t just steel; it’s a reliable partner for B2B operations: contractors rely on it for on-time building projects, manufacturers trust it for consistent equipment frames, and logistics firms value its durability for storage and transportation solutions. Every plate tells a story of engineering precision—born from the need to help businesses build better, faster, and more cost-effectively without sacrificing safety.

Product Features & Highlights

• Exceptional Weldability for Seamless Fabrication: A defining advantage for B2B users, SM400A/SM400B’s low carbon equivalent (CEV ≤ 0.42%) and controlled chemical composition enable compatibility with all standard welding methods (MIG, TIG, arc welding) without complex pre-heating or post-weld treatments. For fabricators, this translates to 20-30% faster production cycles compared to higher-carbon steels—reducing labor costs and minimizing welding defects like porosity or cold cracks. Whether you’re welding large structural beams or small equipment brackets, the steel forms strong, homogeneous joints that meet JIS welding standards, eliminating the need for costly rework or quality inspections.

• Consistent Structural Performance Across Batches: Unlike generic carbon steels that vary in strength or ductility between batches, our SM400 series undergoes rigorous quality control to ensure uniform mechanical properties. Every plate delivers a minimum yield strength of 235MPa and tensile strength of 400-510MPa, with elongation ≥21%—providing the structural stability needed for load-bearing applications. For B2B clients managing large-scale projects (e.g., high-rise buildings, warehouse complexes), this consistency means predictable design outcomes, reduced material waste (≤3% vs. industry average 5-8%), and compliance with structural safety codes.

• Superior Formability for Versatile Applications: The hot-rolled process gives SM400A/SM400B excellent ductility, allowing it to be bent, punched, cut, or rolled into complex shapes without cracking or deformation. This versatility eliminates the need for multiple materials across different project phases—one steel plate can be fabricated into beams, columns, brackets, and panels. For example, a furniture manufacturer can use the same SM400B plate for table frames (bent into curves) and storage racks (punched for assembly), streamlining supply chains and reducing procurement costs.

• Cost-Effective Balance of Quality and Affordability: As a carbon structural steel, SM400A/SM400B offers the ideal middle ground between budget-friendly mild steels (e.g., Q235) and high-cost alloy steels. It delivers 15-20% higher strength than standard mild steel while maintaining a similar price point, allowing B2B clients to optimize material costs without compromising structural integrity. For volume buyers (e.g., construction firms, equipment manufacturers), this cost-efficiency translates to significant savings across large orders—without sacrificing compliance with JIS G3106 standards.

• Durable Atmospheric Corrosion Resistance: The hot-rolled oxide film (black scale) acts as a natural barrier against surface rust during storage and outdoor use, outperforming uncoated mild steels in humid or temperate environments. When paired with basic painting or galvanization (optional customization), the steel delivers long service life—critical for B2B clients looking to minimize maintenance costs for outdoor structures (e.g., bridges, storage yards) or equipment exposed to the elements.

We can supply all types shipbuilding steel plate in different sizes, thin thickness to thick heavy thickness, can cut to size, cut to length, different types sheet metal fabrication,JIS G3106 SM400A SM400B Hot Rolled Carbon Structure Steel Plate, Carbon steel plate, structure steel plate, carbon structure steel plate, JIS G3106 carbon structure steel plate, SM400A carbon steel plate, SM400B carbon steel plate, SM400A structure steel plate, SM400B structure steel plate, SM400A SM400B Hot Rolled Steel Plate, SM400A SM400B Carbon Structure Steel Plate.

Sheet Metal Fabrication Service:

Steel plate cut to size cut to length: 1 pc order is ok.

Steel Plate Laser Cutting: can cut thickness upto 80mm, cut by all drawings and customized sizes.

Steel Plate Flame Cutting: can cut thickness uptp 400mm.

Steel Plate Watejet Cutting: can cut thickness upto 200mm

Steel Sheet Bending: Bending all shapes.

Steel plate Welding:  Customized welding.

CNC machining: Customized CNC machining.

The grades, materials, dimensions can be supplied for Carbon Structure Steel Plate.

JIS G3106 specifies requirements for highly weldable hot-rolled steel for use in welded structures, including bridges, ships, vehicles, petroleum storage tanks and vessels.

JIS G3106 SM400A SM400B Chemical Composition and Technical Property is as below:

The following are the areas of application of the JIS G3106 Standard:

• Bridge construction: The steels specified in JIS G3106 are widely used in the construction of bridges, particularly for structural parts that require welding.

• Shipbuilding: The steels covered by this standard are also suitable for shipbuilding, including welded parts of hulls and related structures.

• Vehicle production: In vehicle production, including rolling stock, the steels of JIS G3106 are used in the manufacture of structural parts for vehicles.

• Petroleum Storage Tanks and Vessels: Used in the manufacture of petroleum storage tanks and vessels, these structures usually require good welding properties.

• Mechanical parts: In the machinery manufacturing industry, JIS G3106 steel can be used for the manufacture of mechanical parts that require welding, such as moving arms and cranes.

• Welded structures: JIS G3106 places special emphasis on the welding properties of the steel and is therefore applicable to all structures requiring welded assemblies.

• Hot rolled steel: This standard specifies the requirements for hot rolled steel, which are used in the welded structures mentioned above.

• Highly weldable hot extruded profiles: JIS G3106:2020 also includes requirements for highly weldable hot extruded profiles.