Product Description

Q355N C High Strength Carbon Steel Plates represent the next generation of structural steel, offering superior mechanical properties, excellent formability, and outstanding weldability. Manufactured from premium Jiangsu,China raw materials and supplied by Wuxi Sylaith Special Steel Co., Ltd , these hot rolled steel sheets are engineered for demanding applications in automotive, construction, and heavy industry.

The Q355N C grade is a high-strength low-alloy (HSLA) structural steel with enhanced toughness and forming characteristics. With thickness ranging from 0.3mm to 3.0mm, these plates deliver the perfect balance of strength and ductility for complex bending, precision welding, and structural fabrication.

Applications

The exceptional properties of Q355N C steel plates make them ideal for demanding applications:

1. Automotive Industry

• Chassis components and frame members

• Structural reinforcements

• Suspension parts

• Body-in-white structural elements

• Commercial vehicle frames

2. Structural Fabrication

• High-strength building frames

• Bridge components

• Industrial plant structures

• Stadium and arena frameworks

• Transmission towers

3. Heavy Machinery

• Excavator arms and buckets

• Crane booms and outriggers

• Mining equipment

• Agricultural machinery frames

• Construction equipment

4. General Fabrication

• Complex bent parts

• Welded assemblies

• Precision components

• Load-bearing structures

Working Principle: How Q355N C Steel Plates Are Made

Q355N C High Strength Steel Plates are produced through advanced metallurgical processes:

Step 1: Raw Material Selection

Premium steel from Sylaith is selected with precise chemical composition control. Micro-alloying elements (Nb, V, Ti) are added to achieve high strength without sacrificing formability.

Step 2: Hot Rolling

The steel is heated above recrystallization temperature and rolled to achieve the required thickness (0.3-3.0mm). Controlled rolling parameters ensure uniform grain refinement and consistent mechanical properties.

Step 3: Normalizing (N Condition)

The "N" in Q355N C indicates normalized or normalized rolled delivery condition. This heat treatment process:

• Refines grain structure

• Improves toughness

• Ensures consistent properties throughout

• Eliminates internal stresses

Step 4: Skin Pass

A light cold rolling pass (skin pass) is applied to:

• Improve surface finish

• Enhance flatness

• Prevent yield point elongation

• Ensure consistent forming behavior

Step 5: Surface Treatment

The plates receive normal oiled / slightly oiled surface treatment to:

• Protect against corrosion during storage and transport

• Prepare surface for subsequent processing

• Maintain bright, clean appearance

Step 6: Quality Inspection

Every coil/plate undergoes rigorous testing:

• Mechanical property verification (yield, tensile, elongation)

• Dimensional inspection (±1% tolerance)

• Surface quality assessment

• Hardness testing (mid hard specification)

Step 7: Certification

Products are certified to multiple international standards:

• ISO 9001 (Quality Management)

• JIS (Japanese Industrial Standards)

• API (American Petroleum Institute)

• SNI (Indonesian National Standard)

• CE (European Conformity)

• GS (German Safety Standard)

• KS (Korean Standard)

Finished sheets are bundled, protected with seaworthy packaging, and prepared for fast 7-day delivery to global ports.

FAQ (Frequently Asked Questions)

Q1: What does Q355N C mean?

A:

• Q = Yield strength (Qu Fu Dian in Chinese)

• 355 = Minimum yield strength of 355 MPa

• N = Normalized or normalized rolled delivery condition

• C = Quality grade with guaranteed impact toughness at 0°C

This makes Q355N C suitable for structural applications requiring high strength and good low-temperature performance.

Q2: What is the difference between Q355N C and regular Q235?

A: Q355N C offers 50% higher yield strength (355 MPa vs 235 MPa) and includes micro-alloying elements (Nb, V, Ti) for improved toughness. It also guarantees impact performance at 0°C, while Q235 has no such guarantee. Q355N C is designed for demanding structural applications where Q235 would be insufficient.

Q3: What thickness range do you offer?

A: We offer 0.3mm to 3.0mm thickness range:

• 0.3-1.0mm: Light gauge for complex forming

• 1.0-2.0mm: Medium gauge for general fabrication

• 2.0-3.0mm: Heavy gauge for structural components

Custom thicknesses within this range are available upon request.

Q4: Is Q355N C suitable for welding?

A: Excellent weldability! Q355N C has low carbon content (≤0.20%) and low carbon equivalent (≤0.45%), allowing welding using standard processes (SMAW, GMAW, FCAW, SAW) without pre-heating for most thicknesses.

Q5: What is "mid hard" hardness?

A: Mid Hard indicates an optimal balance between strength and formability—hard enough for structural integrity yet soft enough for complex bending operations. This makes it ideal for general fabrication where both strength and formability are required.

Q6: What is your delivery time and MOQ?

A: Standard delivery time is 7-20 days after order confirmation, depending on the quantity and any special requirements. Minimum Order Quantity is 1 ton, making it easy for customers to place trial orders or purchase for specific projects.

Q7: Is this steel suitable for bending?

A: Absolutely! Q355N C is specifically designed for complex bending operations, cold forming, stamping, and roll forming. The combination of mid hard hardness and excellent elongation (≥20-22%) ensures reliable, crack-free bending.

Q8: What are the typical automotive applications?

A: Q355N C is widely used in automotive for frame rails, cross members, chassis components, structural reinforcements, suspension parts, and commercial vehicle frames where high strength and good formability are essential.