Q235B Hot Rolled Carbon Steel Round Bar | S235JR Equivalent Solid Steel Rod

Equivalent to S235JR, meets European & Chinese standard
Wide diameter range Φ10–Φ300mm for general structural use
Good weldability & formability for fabrication projects
Stable mechanical property, reliable for forging blanks
Support custom cut-to-length & export seaworthy packaging

Product Overview

Q235B Hot Rolled Carbon Steel Round Bar is solid cylindrical carbon steel rod, equivalent grade S235JR, manufactured strictly under GB/T702 standard. It is hot rolled black surface round bar with mill scale on surface, widely used for structural fabrication, mechanical rough machining, forging blanks, foundation bolt blanks and general machinery components.

Available diameter range Φ10mm to Φ300mm, standard length 6m or 12m. We provide custom cut-to-length service. Each batch comes with mill test certificate for chemical and mechanical property inspection. It has excellent weldability, moderate tensile and yield strength, ideal for non-high-load structural applications.

Carbon Steel Round Bar

Chemical & Mechanical Property Snapshot

Grade	Standard	C (%)	Mn (%)	Si (%)	S (%) ≤	P (%) ≤	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
Q235B	GB/T702	0.12–0.22	0.30–0.70	≤0.35	0.045	0.045	≥235	370–500	≥26
S235JR	EN10025	≤0.17	≤1.40	—	0.045	0.045	≥235	370–500	≥26

Detailed Technical Specifications

Item	Specification
Product Name	Q235B Hot Rolled Carbon Steel Round Bar
Equivalent Grade	S235JR
Material Type	Carbon Steel
Product Shape	Solid Round Bar
Surface Type	Hot-rolled black surface with mill scale
Manufacturing Standards	GB/T702, EN10025
Diameter Range	Φ10mm-Φ300mm
Common Hot Rolled Sizes	Φ12, Φ14, Φ16, Φ18, Φ20, Φ25, Φ30, Φ40, Φ50, Φ60, Φ80, Φ100, Φ120, Φ150, Φ200, Φ250, Φ300mm
Tolerance	Standard hot rolling industrial tolerance
Standard Length	6m /12m
Cutting Service	Custom cut-to-length and zero-cut service
Quality Documentation	Mill Test Certificate including heat identification, chemical composition and mechanical properties
Packaging	Steel strapped bundles for seaworthy export transportation
MOQ	5 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	7–15 working days after receiving deposit

Size Specification Table

Type	Diameter Range	Common Available Diameters	Standard Length	Tolerance	Cutting Service
Hot Rolled Round Bar	Φ10 mm–Φ300 mm	Φ12, Φ14, Φ16, Φ18, Φ20, Φ25, Φ30, Φ40, Φ50, Φ60, Φ80, Φ100, Φ120, Φ150, Φ200, Φ250, Φ300	6 m / 12 m	Standard hot-rolling tolerance	Custom cut-to-length & zero-cut
Cold Drawn Bright Round Bar	Φ3 mm–Φ80 mm	Φ3, Φ4, Φ5, Φ6, Φ8, Φ10, Φ12, Φ14, Φ16, Φ20, Φ25, Φ30, Φ40, Φ50, Φ60, Φ70, Φ80	6 m / 12 m	±0.02–0.05 mm	Custom cut-to-length & zero-cut

Product Comparison Table

Comparison Item	Q235B(S235JR) Hot Rolled Round Bar	Q355B(S355JR) Hot Rolled Round Bar	20# Hot Rolled Round Bar
Equivalent Grade	S235JR	S355JR	1020
Standard	GB/T702, EN10025	GB/T702, EN10025	GB/T702
Yield Strength	≥235MPa	≥355MPa	≥245MPa
Surface	Hot rolled black surface	Hot rolled black surface	Hot rolled black surface
Diameter Range	Φ10-Φ300mm	Φ10-Φ300mm	Φ10-Φ300mm
Core Advantage	Good weldability, low cost for general structure	Higher strength for heavy load structure	Better ductility for deep forging
Typical Application	Building structure, bolt blanks, general machinery	Heavy machinery, support frame, load-bearing parts	Shaft blank, forging parts requiring ductility
Recommended Selection	General structural & low load projects	Heavy load structural components	Precision forging parts

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Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

Is Q235B equal to S235JR?

Q235B is widely recognized as equivalent grade to S235JR, both have similar yield strength and tensile strength for structural applications, but manufacturing standards are different (GB/T702 vs EN10025).

What is the surface of Q235B hot rolled round bar?

It is black hot rolled surface with mill oxide scale, not bright finish. If you need smooth surface, cold drawn round bar is recommended.

What is the MOQ for Q235B round bar?

MOQ is 5 ton, we support custom cut to length according to your drawing requirements.

Can you provide mill test certificate?

Yes, MTC will be supplied together with shipment, including heat number, chemical composition and mechanical test data.

What are the main applications for Q235B hot rolled round bar?

Mainly used for building structural parts, foundation bolt blanks, mechanical rough machining parts, general forging blanks and steel frame components.

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Q235B Hot Rolled Carbon Steel Round Bar | S235JR Equivalent Solid Steel Rod