Q235B Carbon Steel Coil — Factory Direct Supplier | Huaxia-Steel

Hot-Rolled & Cold-Rolled Carbon Steel Coil for Construction, Manufacturing & Export

Q235B is China’s most widely used carbon steel grade for coils and sheets, specified under GB/T 700. Equivalent to SS400 (JIS), S235JR (EN), and ASTM A36, Q235B carbon steel coils offer excellent weldability, formability, and cost efficiency — making them the preferred choice for construction, automotive, and general fabrication applications worldwide.

Huaxia-Steel supplies Q235B hot-rolled and cold-rolled coils in thicknesses from 1.2 mm to 25 mm, widths from 1000 mm to 2000 mm, with full mill test certificates and ISO 9001 quality assurance.

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Q235B Carbon Steel Coil — Quick Specs

Property	Value
Grade	Q235B (GB/T 700)
Equivalent Standards	JIS SS400 / EN S235JR / ASTM A36 / DIN ST37-2
Carbon Content	0.12% – 0.20%
Type	Hot-Rolled Coil (HRC) / Cold-Rolled Coil (CRC)
Thickness Range	1.2 mm – 25 mm (HRC); 0.3 mm – 3 mm (CRC)
Width Range	1000 mm / 1250 mm / 1500 mm / 1800 mm / 2000 mm
Coil Weight	5 – 25 tons per coil
Surface Finish	Black (HRC), Bright/Pickled (CRC), Galvanized (GI)
MOQ	5 tons (sample coils available)
Delivery Time	7–15 days for stock, 20–30 days for mill rolling
Certification	EN 10204 3.1/3.2 MTC, ISO 9001, CE

Chemical Composition of Q235B

Element	C	Si	Mn	P (max)	S (max)
Min	0.12	0.12	0.30	—	—
Max	0.20	0.30	0.70	0.045	0.045

The low carbon content (0.12–0.20%) gives Q235B excellent weldability and formability, while manganese provides adequate strength for structural applications. The controlled phosphorus and sulfur levels ensure good ductility and impact resistance.

Mechanical Properties

Property	Thickness ≤16mm	16–40mm	40–100mm
Yield Strength (MPa)	≥ 235	≥ 225	≥ 215
Tensile Strength (MPa)	370–500	370–500	370–500
Elongation (%)	≥ 26	≥ 25	≥ 24
Impact Energy (J, 20°C)	≥ 27	≥ 27	≥ 27
Impact Energy (J, 0°C)	≥ 27	≥ 27	—

**Need specific mechanical properties for your project?** Send us your specifications →

Available Sizes & Tolerances

Hot-Rolled Coil (HRC)

Thickness (mm)	Width (mm)	Standard Coil Weight	Tolerance
1.2 – 2.0	1000 – 1250	5 – 10 t	±0.05 mm
2.0 – 4.0	1250 – 1500	10 – 15 t	±0.08 mm
4.0 – 8.0	1250 – 1800	10 – 20 t	±0.15 mm
8.0 – 12.0	1500 – 1800	15 – 25 t	±0.20 mm
12.0 – 25.0	1500 – 2000	15 – 25 t	±0.25 mm

Cold-Rolled Coil (CRC)

Thickness (mm)	Width (mm)	Surface Finish	Tolerance
0.3 – 0.5	1000 – 1250	Bright	±0.02 mm
0.5 – 1.0	1000 – 1250	Bright	±0.03 mm
1.0 – 2.0	1000 – 1500	Bright/Pickled	±0.04 mm
2.0 – 3.0	1000 – 1500	Pickled	±0.05 mm

Popular Specifications in Stock

Specification	Type	Availability
2.0 × 1250 × 2500 mm	HRC	✅ In Stock
3.0 × 1500 × 3000 mm	HRC	✅ In Stock
4.75 × 1500 mm coil	HRC	✅ In Stock
5.5 × 1500 mm coil	HRC	✅ In Stock
1.5 × 1250 mm coil	CRC	✅ In Stock
2.0 × 1250 mm coil	CRC	✅ In Stock
0.8 × 1000 mm coil	CRC	✅ In Stock
3.0 × 1500 × 6000 mm	HRC Sheet	✅ In Stock

Q235B Equivalent Grades — Global Standards

Q235B is one of the most interchangeable carbon steel grades globally. This table helps international buyers confirm equivalence:

Standard	Grade	Standard Body	Region
GB/T 700	Q235B	China	China/Asia
JIS G3101	SS400	Japan	Japan/SE Asia
EN 10025	S235JR	Europe	EU/Middle East
ASTM A36	A36	USA	North America
DIN 17100	ST37-2	Germany	Germany/EU
GOST	St3ps	Russia	Russia/CIS

All our Q235B coils can be certified to multiple international standards on request. Contact us for dual certification →

Applications of Q235B Carbon Steel Coil

Construction & Infrastructure

Structural steel framing and beams
Highway guardrails and bridge components
Steel scaffolding and formwork
Building columns and load-bearing structures

Manufacturing & Fabrication

Automotive chassis and body panels
Machinery frames and housings
Steel furniture and storage racks
Agricultural equipment

Steel Processing

Slitting into narrow strips
Cut-to-length flat sheets
Roll-forming into profiles
Stamping and pressing parts

Energy & Transport

Oil and gas pipeline cladding
Shipbuilding plates and sections
Railway car components
Wind tower sections

Why Choose Huaxia-Steel for Q235B Coils?

1. Direct Mill Access

We work with top-tier Chinese steel mills including Baosteel, Shagang, and Ansteel, ensuring consistent quality and competitive pricing. No middleman markups.

2. Flexible Order Quantities

From 5-ton trial orders to 5,000-ton project shipments, we scale with your needs. Sample coils available for new customers.

3. Complete Processing Services

Coil slitting to custom widths (20 mm minimum)
Cut-to-length sheets
Surface treatment: pickling, galvanizing, anti-rust oiling
Custom packaging for export

4. Global Export Experience

Exported to 60+ countries including Vietnam, Thailand, Indonesia, UAE, Saudi Arabia, Brazil, and Nigeria. Full export documentation included.

5. Quality Assurance

100% ultrasonic testing on coils > 6mm
Surface inspection per EN 10163
Dimensional verification per ISO 7452
Full EN 10204 3.1/3.2 MTC with every shipment

Manufacturing Process

Iron Ore → Blast Furnace → Basic Oxygen Furnace → Continuous Casting → Hot Rolling Mill → Coiling → Cooling → Surface Inspection → Packaging → Export Shipping

Our Q235B coils are produced via the BOF route with continuous casting, ensuring uniform chemistry and mechanical properties throughout the coil length.

Quality Inspection & Certification

Every coil shipment includes:

Inspection	Standard	Method
Chemical Composition	GB/T 4336	Spectrometer
Tensile Test	GB/T 228.1	Universal testing machine
Impact Test	GB/T 229	Charpy V-notch
Bend Test	GB/T 232	180° bend
Surface Quality	EN 10163	Visual + automated
Dimensional	ISO 7452	Micrometer

Third-party inspection available: SGS, BV, TÜV, Intertek.

Packaging & Shipping

Package Type	Description
Standard Export	Steel eye-cover, circumferential banding (3–4 straps), radial banding (3 straps)
Sea Freight	Wooden pallet base, anti-corrosion paper, desiccant
Custom	Per customer requirements (oil coating, VCI paper, etc.)

**Loading:** 20ft container (max 25 tons), 40ft container (max 28 tons), or break bulk for large coils.

Frequently Asked Questions

**Q: What is the difference between Q235A and Q235B?** A: Q235A does not require impact testing, while Q235B requires Charpy V-notch impact testing at 20°C (minimum 27J). Q235B is preferred for structural applications where impact resistance is important.

**Q: Can you supply Q235B equivalent grades like SS400 or S235JR?** A: Yes. We can certify coils to JIS SS400, EN S235JR, or ASTM A36 standards. The chemical composition is essentially identical; only the certification standard differs.

**Q: What is the minimum order quantity?** A: MOQ is 5 tons for stock sizes. For custom specifications or mill rolling orders, MOQ is typically 50–100 tons.

**Q: How are coils loaded for export?** A: Coils are loaded horizontally on wooden pallets with eye-cover protection. Each 40ft container can hold approximately 25–28 tons of steel coils.

**Q: Do you provide third-party inspection?** A: Yes. We can arrange SGS, BV, TÜV, or Intertek inspection at the mill before shipment. The inspection report is included with the shipping documents.