Q235B Carbon Steel Flat Bar S235JR A108 Gr.1010 for Construction & Earthing Projects

Excellent weldability and formability for easy fabrication
Stable mechanical performance for general structural use
Complies with GB/T700, equivalent S235JR & A108 Gr.1010
Wide stock size range, fast delivery for construction projects
Cost-effective raw material for earthing steel and purlins

Product Overview

Q235B Carbon Steel Flat Bar is hot rolled rectangular solid flat steel manufactured according to GB/T700 standard, equivalent grades A108 Gr.1010 and S235JR. It is the most popular general carbon structural flat bar with balanced ductility and strength. This Q235B flat bar features low carbon composition, outstanding welding, cutting and bending performance.

Available dimension range: width 12mm to 300mm, thickness 3mm to 60mm. Standard factory lengths are 6m and 12m. Common stocked specifications include 20×3, 25×4, 30×5, 40×5, 50×6, 60×8, 80×10, 100×12, 120×14, 150×16, 200×20.

Q235B flat bar is widely processed into lightning earthing steel, steel purlins, curtain wall embedded parts, cable tray supports, guardrails and simple structural brackets. Each batch can be supplied with Mill Test Certificate including heat number, chemical composition and mechanical performance data for quality traceability.

Carbon Steel Flat Bar

Chemical & Mechanical Property Snapshot

Item	Value
Grade	Q235B
Standard	GB/T 700, Equivalent: A108 Gr.1010, S235JR
C (%)	≤0.20
Mn (%)	0.30-0.70
Si (%)	≤0.35
S (%) ≤	0.045
P (%) ≤	0.045
Yield Strength (MPa)	≥235
Tensile Strength (MPa)	370-500
Elongation (%)	≥26

Detailed Technical Specifications

Item	Specification
Product Name	Q235B Carbon Steel Flat Bar
Material Type	Carbon Structural Steel
Manufacturing Process	Hot-Rolled
Cross Section	Rectangular Solid Bar
Standards	GB/T700, Equivalent A108 Gr.1010, S235JR
Available Grade	Q235B
Width Range	12mm – 300mm
Thickness Range	3mm – 60mm
Common Sizes	20×3, 25×4, 30×5, 40×5, 50×6, 60×8, 80×10, 100×12, 120×14, 150×16, 200×20
Standard Length	6m / 12m
Quality Documentation	Mill Test Certificate with heat number, chemical composition and mechanical performance test data
Packaging	Steel strapped bundles for seaworthy export packaging
MOQ	5 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	7-15 working days after receiving deposit

Size Specification Table

Item	Specifications
Width Range	12–300 mm
Thickness Range	3–60 mm
Common Stock Sizes	20×3, 25×4, 30×5, 40×5, 50×6, 60×8, 80×10, 100×12, 120×14, 150×16, 200×20
Standard Length	6 m, 12 m
Custom Length	Available upon request

Product Comparison Table

Comparison Item	Q235B Carbon Steel Flat Bar	Carbon Steel Round Bar	Carbon Steel Square Bar
Cross Section	Rectangular flat profile	Circular profile	Square profile
Main Advantage	Easy cutting, welding, structural fabrication; large contact surface	Suitable for shafts and rotating parts; uniform stress distribution	Suitable for frames and support structures; easy assembly
Standard Grades & Equivalent	Q235B (S235JR, A108 Gr.1010)	Q235B (S235JR, A108 Gr.1010)	Q235B (S235JR, A108 Gr.1010)
Typical Processing	Welding, stamping, grinding, fabrication, bending	Turning, machining, forging, heat treatment	Structural assembly, machining, cutting
Common Applications	Purlins, grounding steel, supports, guardrails, flange blanks	Shafts, gears, mechanical parts, fasteners	Frames, brackets, machine structures, fixture bases
Dimension Characteristics	Width:12–300 mm; Thickness:3–60 mm	Diameter-based specifications	Side-length-based specifications
Recommended Buyer	Construction contractors, steel fabricators, hardware manufacturers	Mechanical component producers, auto parts factories	Structural fabrication workshops, machinery manufacturers
Production Standard	GB/T700	GB/T 702, EN 10060	GB/T 702, EN 10059
Surface Option	Hot rolled / Pickled	Hot rolled / Cold drawn	Hot rolled / Cold drawn

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Guardrail Flat Bar

Cable Tray Supports

Curtain Wall Embedded Parts

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is the equivalent grade of Q235B carbon steel flat bar?

Q235B flat bar complies with GB/T700, its equivalent grades are A108 Gr.1010 and S235JR.

What are the main applications for Q235B flat bar?

Widely used for lightning earthing steel, steel purlins, curtain wall embedded components, cable tray supports, guardrails and general structural brackets.

Can Q235B flat bar be welded?

Yes. Q235B has low carbon content, excellent weldability, suitable for all normal welding operations.

What is your MOQ and lead time for Q235B flat bar?

MOQ is 5 tons. Delivery time is 7-15 working days after receiving deposit.

Can you provide MTC for Q235B carbon steel flat bar?

Yes, Mill Test Certificate will be supplied with each batch, including heat number, chemical composition and mechanical property data.

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Q235B Carbon Steel Flat Bar S235JR A108 Gr.1010 for Construction & Earthing Projects