GB/T 1591 Q345B Steel — Specifications & Listings

GB/T 1591

Low alloy high strength structural steel with good toughness, weldability and mechanical performance. Widely used in bridges, heavy structures and engineering machinery.

Category: Mild Steel

Grade Details

Grade	GB/T 1591 Q345B
Standard	GB/T 1591
Description	Low alloy high strength structural steel with good toughness, weldability and mechanical performance. Widely used in bridges, heavy structures and engineering machinery.
Applications	bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery

Equivalent / Similar Grades

Grade	Standard	Region
S355JR	EN 10025	Europe
SM490A	JIS G3106	Japan
09G2S	GOST	Russia

Chemical Composition (%)

C	Si	Mn	S	P	V	Nb	Ti
<=0.20	<=0.50	1.00-1.60	<=0.035	<=0.035	<=0.20	<=0.07	<=0.20

Mechanical Properties

tensile_strength	470-630 MPa
yield_strength	>=345 MPa
elongation	>=21%
impact_energy	>=34 J

Typical Available Sizes

Round Bar	16-300 mm dia
Flat Bar	25-600 mm width

Sizes are indicative. Contact seller for exact availability.

Active GB/T 1591 Q345B Listings on M-EX

No active GB/T 1591 Q345B listings at this time.