S355JR Carbon Steel Square Bar | EN 10059 Hot Rolled & Cold Drawn Square Steel Bar

High yield strength for heavy load structural use
CE certified, compliant with EU construction norms
Good impact toughness and reliable ductility
Dual surface options: black hot rolled / bright cold drawn
Wide size portfolio for custom engineering fabrication

Product Overview

S355JR Carbon Steel Square Bar is produced under EN 10059 specification, a popular non-alloy high-strength structural steel for European market. It is available in hot rolled and cold drawn production processes. Hot rolled S355JR square bar comes with black oxide surface, while cold drawn version delivers bright smooth surface with tighter dimensional tolerance. S355JR features superior mechanical strength, good weldability and machining performance. It is widely applied for high-strength European engineering structures, heavy load frames, construction supports and mechanical base fabrication. Custom cut lengths are supported to satisfy different project requirements.

Carbon Steel Square Bar

Chemical & Mechanical Property Snapshot

Item	S355JR Carbon Steel Square Bar (EN 10059)
Carbon (C)	≤0.24%
Silicon (Si)	≤0.55%
Manganese (Mn)	≤1.60%
Phosphorus (P)	≤0.035%
Sulfur (S)	≤0.035%
Yield Strength (Min)	355 MPa
Tensile Strength	470–630 MPa
Elongation (Min)	≥21%
Impact Test	JR grade, +20℃ impact energy

Detailed Technical Specifications

Specification Item	Parameter
Product Name	S355JR Carbon Steel Square Bar
Standard	EN 10059
Production Process	Hot-Rolled / Cold-Drawn
Size Range	Hot Roll:10×10–200×200 mm; Cold Drawn:5×5–50×50 mm
Surface Condition	Hot-rolled black surface / Bright cold-drawn surface
Dimensional Tolerance	Hot Roll: ±0.5–2 mm; Cold Drawn: ±0.1–0.3 mm
Length	3m–12m or customized cut length
MOQ	5 Ton
Lead Time	7–15 working days
Package	Steel bundle with metal strapping, waterproof wrapping

Size Specification Table

Type	Size Range	Available Side Dimensions (mm)	Tolerance
Hot Rolled Carbon Steel Square Bar	10×10 mm–200×200 mm	10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100, 120, 150, 200	±0.5–±2 mm
Cold Drawn Carbon Steel Square Bar	5×5 mm–50×50 mm	5, 6, 8, 10, 12, 14, 16, 20, 25, 30, 40, 50	±0.1–±0.3 mm

Product Comparison Table

Comparison Item	Q235B Carbon Steel Square Bar	Q355B Carbon Steel Square Bar	S235JR Carbon Steel Square Bar	S355JR Carbon Steel Square Bar	A36 Carbon Steel Square Bar
Equivalent Standard	GB/T 702	GB/T 702	EN 10059	EN 10059	ASTM A675
Manufacturing Process	Hot-Rolled / Cold-Drawn	Hot-Rolled / Cold-Drawn	Hot-Rolled / Cold-Drawn	Hot-Rolled / Cold-Drawn	Hot-Rolled / Cold-Drawn
Size Range	Hot Roll: 10×10–200×200 mm; Cold Drawn: 5×5–50×50 mm	Hot Roll: 10×10–200×200 mm; Cold Drawn: 5×5–50×50 mm	Hot Roll: 10×10–200×200 mm; Cold Drawn: 5×5–50×50 mm	Hot Roll: 10×10–200×200 mm; Cold Drawn: 5×5–50×50 mm	Hot Roll: 10×10–200×200 mm; Cold Drawn: 5×5–50×50 mm
Surface Condition	Hot-rolled black surface / Bright cold-drawn surface	Hot-rolled black surface / Bright cold-drawn surface	Hot-rolled black surface / Bright cold-drawn surface	Hot-rolled black surface / Bright cold-drawn surface	Hot-rolled black surface / Bright cold-drawn surface
Dimensional Tolerance	Hot Roll: ±0.5–2 mm; Cold Drawn: ±0.1–0.3 mm	Hot Roll: ±0.5–2 mm; Cold Drawn: ±0.1–0.3 mm	Hot Roll: ±0.5–2 mm; Cold Drawn: ±0.1–0.3 mm	Hot Roll: ±0.5–2 mm; Cold Drawn: ±0.1–0.3 mm	Hot Roll: ±0.5–2 mm; Cold Drawn: ±0.1–0.3 mm
Yield Strength (Min)	235 MPa	355 MPa	235 MPa	355 MPa	250 MPa
Main Application	General steel structures, mechanical frames, mold blanks	Heavy-load supports, engineering structures, lifting parts	European-standard structural fabrication, mechanical bases	High-strength European engineering structures	American-standard machinery, structural components
Cost Level	Medium	Medium-High	Medium	Medium-High	Medium
Feature	Good weldability & machinability	High strength, good impact resistance	Excellent weldability, CE compliance	High strength, CE certified	Stable performance, ASTM standard

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Hardware Stamping Blanking

Steel Structure Support

Machine Frame

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What standard applies to S355JR square bar?

S355JR carbon steel square bar complies with EN 10059 standard for hot rolled and cold drawn solid square steel bars.

What is the difference between S235JR and S355JR square bar?

S355JR has higher yield strength for heavy load engineering, while S235JR is for light & general structural fabrication.

Does S355JR square bar support CE certification?

Yes, CE certification can be provided to meet European construction market requirements.

What surface options are available?

Hot rolled black oxide surface and bright cold-drawn surface with tighter tolerance for precision machining.

Can S355JR square bar be cut into custom lengths?

Custom cutting service is available. MOQ 5 tons, lead time 7–15 working days.

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S355JR Carbon Steel Square Bar | EN 10059 Hot Rolled & Cold Drawn Square Steel Bar