Steel

Minimum yield 235–300 MPa. Ordinary carbon steel, easy to weld, cut and form — and its counterparts in other countries.

Grade	Standard	Yield strength at 10 mm	Tensile strength	Closest to	Evidence
Q235B China's general structural steel: 235 MPa yield up to 16 mm, 370–500 MPa tensile, 27 J at +20 °C (B).	GB/T 700	≥ 235 MPa3	370–500 MPa3	S235Close match	Confirmed 3 Corroborated 2 Single source 7 Disagreements explained 1

S355 and every grade the world lists against it, compared on what each standard guarantees. Some “equivalents” fall short; their yield shows it.

Grade	Standard	Yield strength at 10 mm	Tensile strength	Closest to	Evidence
Q355 China's S355 counterpart, which replaced Q345 in GB/T 1591-2018. Q355B/C/D test 34 J at +20/0/−20 °C.	GB/T 1591-2018	≥ 355 MPa3	470–630 MPa2	S355Close match	From the standard 1 Confirmed 2 Corroborated 1 Disagreements explained 2