Q355b High Strength Unequal Angle Steel Bar for Tower Frame Construction

Name: Q355b High Strength Unequal Angle Steel Bar for Tower Frame Construction
Brand: Taihui Metal Materials Co., Ltd
SKU: 2334300585

Zhejiang, ChinaTaihui Metal Materials Co., Ltd

US$530.00

5 Tons

Product profile

Customization

Available

After-sales Service

Online Technical Support

Connection Form

Bolted/Self-Tapping Screw

Model NO.

GB/T 706 + GB/T 1591-2018

Feature

Anti-Corrosion, Earthquake Resistance, High Intensity, Recyclable

Install

Online Guidance

Material

Q355b (Formerly Q345b) / Q355c / Q355D

Standard

GB/T 706 + GB/T 1591-2018

Equal Angle Size

40X40X3 ~ 200X200X24 mm

Unequal Angle Size

40X25X3 ~ 200X125X18 mm

Yield Strength

>=355 MPa

Tensile Strength

470 - 630 MPa

Elongation

>=20%

Impact Energy

>=34 J (-20c, Q355b)

Carbon Equivalent

<=0.45%

Theoretical Weight

1.852 - 71.17 Kg/M

Length

6m / 9m / 12m / Cut

Transport Package

Bundled + Wooden Pallet

Specification

Q355B 40×40×3-200×200×24

Origin

China

HS Code

7216109000

Key features

High Strength - Yield strength 355MPa, 50% higher than Q235 angle, can reduce section size under same load.

Material Saving - Saves 20-30% steel vs Q235 angle under same load capacity, reducing project cost.

Good Toughness - Q355B good low-temperature impact toughness (-20C impact energy >=34J), suitable for cold regions and dynamic load structures.

Good Weldability - Carbon equivalent <=0.45%, good weldability, generally no preheating needed before welding (except thick plates).

Complete Sizes - Equal angle #40-#200, unequal angle 4/2.5#-20/12.5# in stock.

Wide Application - Preferred section for long-span and heavy-load structures.

Company profile

High Repeat Buyers Choice

Taihui Metal Materials Co., Ltd

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedNearest Port: Shanghai PortAverage Response Time: ≤0.01h CertifiedTerms of Payment: LC, T/T, D/P, etc.

About Our Factory & Business Background

AddressNo. 1, Building 7, No. 98 Linhang Avenue, Leidian Town, Huzhou, Zhejiang, China

Plant Area5799 square meters

Registered Capital10,000,000 RMB

International Commercial Terms(Incoterms)FOB, CIF, CFR, EXW

Average Lead TimePeak Season Lead Time: one month Off Season Lead Time: within 15 workdays

Minimum Order Quantity10 kg

Supply Chain Partners20

Our Production Capability & Technical Expertise

Main ProductsSteel Bar Truss, C Purlin, Z Purlin, Open-Type Floor Deck, Closed-Type Floor Deck, Steel Bar Truss Floor Deck, Color Steel Tile, Rock Wool Sandwich Panel, EPS Sandwich Panel, PU Sandwich Panel

Production MachinesBending Machine

Inspection Type for Finished ProductsRandom inspection(Function inspection & Visual inspection)

Inspection Method for Finished ProductsFinished product checked by packing staff

Traceability of Raw MaterialsYes

Our Industry Experience & Global Business Record

Year of Establishment2015-03-24

Main MarketsDomestic

Repeat Buyers Choice50%~80%

Overseas Agent/BranchNo

Product Q&A

Q:How to choose between Q355B and Q235B angle?

Q235B yield 235MPa, good ductility/weldability, low price, for general load and span structures; Q355B yield 355MPa, 50% higher strength, good toughness, for long-span, heavy load, cold regions and dynamic load structures. Same load Q355B saves 20-30% steel, but unit price 5-10% higher. Selection: load size, span, environment, economy.

Q:Difference between Q355B and Q345B?

Q355B is upgraded grade of Q345B (2018 GB/T 1591 revision), same yield strength (>=355MPa), but Q355B has stricter chemical composition and impact toughness requirements (-20C impact energy >=34J, Q345B +20C >=34J). Q355B more stable performance, can replace Q345B. We stock Q355B.

Q:Does Q355B angle need preheating before welding?

Q355B carbon equivalent <=0.45%, good weldability. Generally (plate thickness <=25mm, ambient temp >=0C) no preheating needed; thickness >25mm or temp <0C recommend preheating 100-150C; important structures recommend post-weld stress relief heat treatment.

Q:Can hot-dip galvanize?

Yes. Q355B angle hot-dip galvanized has 20-30 year anti-corrosion life, suitable for outdoor heavy-load structures. Galvanizing has minimal effect on Q355B mechanical properties, but need to control deformation during galvanizing. Recommend fabricate first then galvanize.

Q:MOQ and lead time?

Stock sizes (equal angle #40-#150, unequal angle 4/2.5#-15/10#) 1 tonne MOQ 3-7 days, special sizes and custom cut 3 tonnes MOQ 7-15 days. Cutting, drilling, welding, hot-dip galvanizing etc. fabrication available.