Carbon Steel · Steel Plate

Q235B Hot Rolled Steel Plate

General-purpose hot rolled carbon steel plate with proven strength and weldability — the economical workhorse for structural fabrication, machinery and heavy construction.

Standard: GB/T 700 · GB/T 3274 Finish: Hot Rolled Thickness 2–200 mm

Yield Strength

≥235 MPa

Tensile Strength

370–500 MPa

Lăţime

1000–2500 mm

01 · Product Overview

The economical all-purpose structural plate

Q235B hot rolled steel plate is a low-carbon structural plate produced to GB/T 700 and supplied per GB/T 3274. The hot rolling process forms a characteristic mill-scale surface and delivers consistent plate geometry, flatness and through-thickness mechanical properties.

Offering dependable strength, easy welding and outstanding value, Q235B plate is the standard choice for building structures, bridge fabrication, general machinery, storage tanks, ship components and heavy welded assemblies — available in thicknesses from 2 mm to 200 mm with full cutting and processing support.

02 · Key Features

Why choose Q235B steel plate

Dependable Strength

Minimum yield of 235 MPa with tensile 370–500 MPa — verified performance for structural and load-bearing applications.

Outstanding Weldability

Low carbon equivalent suits all common welding processes and makes field fabrication fast and trouble-free.

Excellent Formability

Bends, rolls and presses cleanly in all directions — ideal for tanks, chutes, guards and formed components.

Wide Size Range

2–200 mm thickness, 1000–2500 mm width, up to 12 m length — plus plasma and laser cutting to your drawing.

Consistent Flatness

Controlled leveling delivers flat plates with square, clean-cut edges ready for immediate fabrication.

Certified & Traceable

Mill test certificates, heat numbers and batch traceability provided; third-party inspection welcome.

03 · Chemical Composition

Chemical composition (wt%) — GB/T 700 Q235B

Element	Carbon (C)	Silicon (Si)	Manganese (Mn)	Sulfur (S)	Phosphorus (P)
Conţinut	≤ 0.20	≤ 0.35	≤ 1.40	≤ 0.045	≤ 0.045

Note: single values are maximum limits per GB/T 700. Residual copper ≤ 0.30%. Heat analysis applies to ladle samples.

04 · Mechanical Properties

Mechanical properties (thickness ≤ 16 mm)

Property	Yield Strength ReH	Tensile Strength Rm	Elongation A	Impact (20°C)	Hardness (approx.)
Value	≥ 235 MPa	370 – 500 MPa	≥ 26%	≥ 27 J	~ 121 HBW

Tensile strength — common structural plate grades comparison (MPa)

Q235B (this product)370 – 500

A36 (ASTM)400 – 550

S275JR (ÎN 10025)410 – 560

Q355B (low alloy)470 – 630

05 · Physical Properties

Physical properties

Density7.85 g/cm³

Melting point≈ 1,510 °C

Modulus of elasticity≈ 206 GPa

Poisson’s ratio0.30

Thermal conductivity (100°C)~ 50 W/(m·K)

Electrical resistivity (20°C)~ 0.17 µΩ·m

Coefficient of linear expansion~ 12×10⁻⁶ /°C

Surface finishMill scale / black

06 · Common Specifications

Common sizes & specifications

Grosime (mm)	Lăţime (mm)	Lungime (mm)	Toleranţă	Suprafaţă
2, 3, 4, 5, 6	1000 / 1250 / 1500	2000 / 2500 / 3000	GB/T 709	Mill scale
8, 10, 12, 16	1500 / 2000 / 2200	6000 / 8000 / 12000	GB/T 709	Mill scale
20, 25, 30, 40	2000 / 2200 / 2500	6000 / 12000	GB/T 709	Mill scale / shot blasted
50, 60, 80, 100, 120, 150, 200	2000 / 2200 / 2500	Custom cut	GB/T 709	Mill scale

Plasma, laser and water-jet cutting to custom shapes available. Extra-wide plates and cut-to-size service on request.

07 · Applications

Where Q235B steel plate is used

Building structures, columns and beams
Bridges, steel platforms and towers
General machinery and equipment frames
Storage tanks, silos and pressure vessels
Shipbuilding and offshore components
Heavy welded assemblies and chassis

08 · Processing & Ambalare

Processing services & export packaging

Processing

Plasma / laser / water-jet cutting
Bending, rolling & forming
Drilling & punching
Shot blasting & derusting (Sa2.5)
Priming & painting
Edge milling & beveling

Ambalare

Bare bundles with steel straps
Wooden pallet / crate for sea freight
Water-proof wrapping on request
Labels with grade, dimensiune & heat no.
Mill test certificate (MTC) supplied
3rd-party inspection acceptable

Need Q235B steel plate cut to size?

Send us your thickness, lăţime, length and cutting requirements — we reply within 24 hours with a competitive quote and delivery plan.

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