CARBON STEEL · CHANNEL SECTION

Q235B Carbon Steel Channel
GB/T 706 Hot-Rolled U-Channel (UPE / UPN)

A classic structural section with flat, parallel flanges — the economical choice for purlins, quadros, colchetes, machinery and vehicle chassis.

STANDARD: GB/T 706 GRADE: Q235B SIZE: 5# – 40#

YIELD STRENGTH

≥235 MPa

TENSILE STRENGTH

370–500 MPa

SECTION HEIGHT

50–400 mm

01 · PRODUCT OVERVIEW

Q235B channels are hot-rolled to GB/T 706 with a U-shaped cross-section, parallel flanges and a straight web. They combine good bending strength in one plane with an easy flat surface for bolting and welding, making them a first choice for secondary structural members across construction and industry.

WHY CHOOSE Q235B CHANNEL

One material, one grade — Q235B only. Hot-rolled from billet with stable chemistry, consistent section geometry and guaranteed mechanicals; available in full range from 5# para 40#.

02 · KEY FEATURES

One-Plane Bending Strength

High section modulus about the strong axis — ideal as purlins, beams and joists.

Easy Connection

Flat parallel flanges give clean bolting and welding surfaces for fast on-site assembly.

Full Weldability

Q235B welds cleanly in all positions — no pre-heat needed for ordinary shop welding.

Stable Mechanicals

Hot rolling delivers consistent yield and tensile values verified by mill certificate.

Cost Efficient

Efficient material layout and economical rolling cost — a low-cost structural workhorse.

Full Size Range

From 50×37×4.5 (5#) to 400×104×14.5 (40#), stocked in 6 m, 9 m and 12 m lengths.

03 · CHEMICAL COMPOSITION (Cast Analysis, %) — Q235B

Elemento	C	E	Mn	P	S
Max Content	0.20	0.35	1.40	0.045	0.045

Note: Values are maximum cast analysis in percent. Mill test certificates accompany each batch.

04 · MECHANICAL PROPERTIES

Propriedade	Valor	Test Method
Força de rendimento (ReH)	≥ 235 MPa	GB/T 228.1
Resistência à tracção (Rm)	370 – 500 MPa	GB/T 228.1
Alongamento (A)	≥ 26 %	GB/T 228.1
Charpy Impact (20 °C)	≥ 27 J	GB/T 229
Dureza	≈ 121 HBW	GB/T 231.1

TENSILE STRENGTH — COMMON GRADES COMPARISON

Q235B Channel (370–500 MPa)RANGE

Q355B (470–630 MPa)HIGHER

05 · PHYSICAL PROPERTIES

DENSITY

7.85 g/cm³

MELTING POINT

≈ 1510 °C

MODULUS OF ELASTICITY

200 – 210 GPa

POISSON’S RATIO

0.3

06 · COMMON SPECIFICATIONS (Selected Sizes)

Tamanho #	Dimensions h×b×d (milímetros)	Weight (kg/m)	Comprimento (m)
5#	50×37×4.5	5.44	6 / 9 / 12
6.3#	63×40×4.8	6.63	6 / 9 / 12
8#	80×43×5.0	8.05	6 / 9 / 12
10#	100×48×5.3	10.01	6 / 9 / 12
12#	120×53×5.5	12.06	6 / 12
14#	140×60×6.0	14.53	6 / 12
16#	160×65×6.5	17.24	6 / 12
20#	200×73×7.0	22.64	6 / 12