Post Stock Login Register

GB/T 1591-2018 Q345B Steel: Specifications & Listings

GB/T 1591-2018 Q345B: Low alloy high strength structural steel with good toughness, weldability and mechanical performance. Widely used in bridges, heavy structures and engineering machinery.

Forms: Plate Category: Structural Steel
Grade Details
GradeGB/T 1591-2018 Q345B
Standard GB/T 1591-2018
Applicationsbridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
Most Active InWest (Gujarat, Maharashtra)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
EN 10025-2 S355JR EN 10025-2:2019 Europe 3 listings, 0 RFQs →
JIS G3106 SM490A JIS G3106:2020 Japan 2 listings, 0 RFQs →
GOST 19281 09G2S GOST 19281-2014 Russia 2 listings, 0 RFQs →
Supply & Demand by FormSee Full Supply & Demand →
Plate →
Low Activity
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
AS/NZS 3678 Grade 450 AS/NZS 3678:2016 Close Alternative
AS/NZS Grade 500 AS/NZS 3597:2008 Close Alternative
ASTM A572 Grade 50 ASTM A572 Related Material
AS/NZS 3679.1 350 AS/NZS 3679.1:2016 Related Material
ASTM A572/A572M Grade 50 ASTM A572/A572M:2021 Related Material
ASTM A572/A572M Grade 50 ASTM A572/A572M:2018 Related Material
CSA G40.21 400W CSA G40.21-13 (R2023) Related Material
SAE J404 1330 SAE J404:2009 Related Material
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
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.

Popular forms for this grade:

Plate (2)

Active GB/T 1591-2018 Q345B Listings on M-EX (For Sale)

+ Create a Listing for this grade
GB/T 1591-2018 Q345B Plate
8.000 MT
View Listing
GB/T 1591-2018 Q345B Plate
7.800 MT
View Listing

Buyer RFQs for GB/T 1591-2018 Q345B

+ Post an RFQ for this grade

No open buyer requirements for GB/T 1591-2018 Q345B at this time.

Register for Alerts