Introduction

HQ600 Carbon Steel Plate is a high-strength, low-alloy carbon steel plate designed specifically for industries that require high strength and durability.

Chemical Composition Table

Element	Content Range (wt%)
C (Carbon)	0.18~0.25
Si (Silicon)	0.15~0.40
Mn (Manganese)	1.00~1.60
P (Phosphorus)	≤0.020
S (Sulfur)	≤0.010
Cr (Chromium)	0.30~0.80
Mo (Molybdenum)	0.20~0.40
B (Boron)	0.001~0.005
Ti/Nb/V (Titanium/Niobium/Vanadium)	Trace (0.01~0.10)

Common Sizes

Thickness (mm)	Width (mm)	Length (mm)
8	2200	10000
10	2000	10000
20	2500	12000
50	2500	10000
80	2500	12000
120	2200	10000

Advantages

High Strength
The yield strength of our products is typically no less than 600 MPa, while their tensile strength can reach 620–850 MPa. This strength ensures excellent structural stability under heavy loads.

Good Toughness
The HQ600 Carbon Steel Plate exhibit excellent impact toughness and retain a certain degree of toughness in low-temperature environments. For example, at a low temperature of -20°C, S60 steel plates that have been properly heat-treated can still maintain a low impact absorption value, preventing structural damage due to brittle fracture.

Excellent Weldability
Our carbon steel plates have a low carbon equivalent (usually less than 0.5), which ensures good welding performance. During welding, the tendency to form cold cracks is minimized, ensuring the strength and reliability of the welded joints.

Good Corrosion Resistance
After galvanizing, our carbon steel plates effectively resist atmospheric and seawater corrosion. The average thickness of the galvanized layer is 50–100 μm, providing more than 15 years of corrosion protection in marine environments and extending the service life of the material.

Easy to Process and Shape
This product has excellent cold and hot processing properties and is suitable for forming through various techniques such as rolling, forging, bending, and stamping. Its good processing properties reduce the likelihood of cracking or deformation during complex manufacturing processes, especially in the production of intricate shapes or large structural parts, while maintaining high processing accuracy.

Main Applications

Application Sector	Specific Use Cases
Construction & Structural Engineering	Bridges
	High-rise buildings
	Offshore platforms
Heavy Machinery & Equipment	Cranes & excavators (booms, arms, chassis)
	Mining equipment (dump trucks, drilling rigs, shovels)
Transportation & Automotive	Commercial vehicles (truck frames, trailers, dump bodies)
	Railway cars (bogies, underframes)
Shipbuilding & Marine Applications	Ship hulls & decks
Energy & Pressure Vessels	Wind turbine towers
	Hydropower plants

Production Process

Production Stage	Key Process Steps
1. Raw Material Preparation	- Iron ore & coke → Blast furnace → Molten iron
	- Basic oxygen furnace (BOF) or electric arc furnace (EAF) refining
2. Continuous Casting	- Molten steel → Slab casting (thickness 200-300mm)

3. Hot Rolling	- Slab reheating (1200°C) → Roughing + finishing rolling
	- Finish rolling temperature: 800-900°C
4. Heat Treatment	Option A: Quenching (water/oil cooling) + Tempering (400-600°C)
	Option B: Direct quenching (DQ)
5. Finishing	- Cutting (plasma/flame)
	- Surface treatment (shot blasting, anti-rust coating)
6. Quality Inspection	- Mechanical tests: Tensile (Yield ≥600MPa), -40°C impact test
	- NDT: Ultrasonic testing (UT), Magnetic particle testing (MT)

Comparison with Mild Steel Plates

Comparison Item	HQ600 Plate	Q235 Mild Steel Plate
Rolling Process	TMCP required	Conventional hot rolling
Cooling Rate	>15°C/s (accelerated cooling)	Air cooling
Microstructure	Bainite + tempered martensite	Ferrite + pearlite
Yield Strength	≥600MPa	235MPa