GB/T 700· China

Q235B

China's general structural steel: 235 MPa yield up to 16 mm, 370–500 MPa tensile, 27 J at +20 °C (B).

Q235BANo impact testQ235BB27 J at +20 °C

Compared with S235 on its equivalents table.

Nominal thicknessmm

Yield strength ReH: ≥ 225MPa
Corroborated16–40 mm
Tensile strength Rm: 370–500MPa
Confirmed

All values

Strength

Yield strength ReH

Upper yield strength guaranteed by the product standard (minimum).

Condition	Value	Evidence
	≥ 235MPa	Confirmed
	≥ 225MPa	Corroborated
	≥ 215MPa	Corroborated
	≥ 215MPa	Single source1

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	370–500MPa	Confirmed

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 26%	Confirmed

Toughness

Impact energy (Charpy V) KV

Minimum absorbed energy at the stated test temperature.

Condition	Value	Evidence
	≥ 27J	Single source

Chemical composition

Show on the periodic table

Q235B, % by mass, maximum (Goldsupplier)

Element	Applies to	Max %	Evidence
C	all thicknesses	0.21	Single source
Si	all thicknesses	0.35	Single source
Mn	all thicknesses	0.65	Single source
P	all thicknesses	0.045	Single source
S	all thicknesses	0.045	Single source

Listed as equivalent to

S235 (EN 10025-2:2019) — Same yield steps (235/225/215 MPa) and impact qualities; tensile 370–500 MPa vs 360–510.

Sources here are public pages that reproduce GB/T 700. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence.