Carbon Steel · Steel Plate

Q235B 열간압연 강판

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

기준: GB/T 700 · GB/T 3274 Finish: 열간압연 Thickness 2–200 mm

항복 강도

≥235 MPa

인장강도

370–500 MPa

너비

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, 저장 탱크, ship components and heavy welded assemblies — available in thicknesses from 2 mm 에 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, 최대 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

화학 성분 (wt%) — GB/T 700 Q235B

요소	탄소 (기음)	규소 (그리고)	망간 (망)	황 (에스)	Phosphorus (피)
콘텐츠	≤ 0.20	≤ 0.35	≤ 1.40	≤ 0.045	≤ 0.045

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

04 · Mechanical Properties

기계적 성질 (thickness ≤ 16 mm)

재산	Yield Strength ReH	Tensile Strength Rm	Elongation A	영향 (20℃)	경도 (approx.)
값	≥ 235 MPa	370 – 500 MPa	≥ 26%	≥ 27 제이	~ 121 HBW

Tensile strength — common structural plate grades comparison (MPa)

Q235B (this product)370 – 500

A36 (ASTM)400 – 550

S275JR (안에 10025)410 – 560

Q355B (low alloy)470 – 630

05 · Physical Properties

Physical properties

밀도7.85 g/cm3

Melting point≒ 1,510 ℃

Modulus of elasticity≒ 206 평점

Poisson’s ratio0.30

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

Electrical resistivity (20℃)~ 0.17 µΩ·m

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

표면 마무리Mill scale / 검은색

06 · Common Specifications

Common sizes & 명세서

두께 (mm)	너비 (mm)	길이 (mm)	용인	표면
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 & 포장

Processing services & export packaging

처리

Plasma / laser / water-jet cutting
벤딩, 구르는 & 형성
Drilling & punching
Shot blasting & derusting (Sa2.5)
Priming & 그림
Edge milling & beveling

포장

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

Need Q235B steel plate cut to size?

두께를 보내주세요, 너비, length and cutting requirements — we reply within 24 hours with a competitive quote and delivery plan.

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