Carbon Steel Square Bar Manufacturer

Carbon Steel Square Bar

Hot‑rolled & cold‑drawn available, cold‑drawn starts at minimum 5×5 mm
Full size coverage: 10×10 mm‑200×200 mm for diverse structural & machining jobs
Controlled hot‑rolled tolerance ±0.5‑2 mm, stable dimensional consistency
Versatile for structural support, mold making, stamping and container accessory fabrication

Product Overview

Carbon Steel Square Bar is a solid square-section carbon steel product designed for structural assembly, mold manufacturing and mechanical processing. It is available in both hot-rolled square bar and cold-drawn square bar forms, providing flexible solutions for different fabrication and machining requirements.

Manufactured and inspected according to GB/T702, EN10059 and ASTM A675 standards, Carbon Steel Square Bar provides stable dimensional performance for industrial applications. The hot-rolled version covers common engineering sizes from 10×10mm to 200×200mm, while cold-drawn square bar supports smaller precision sizes starting from 5×5mm.

The product is suitable for applications requiring strong structural support and machining adaptability. Hot-rolled square bar is commonly selected for mechanical frames, steel structure supports and general fabrication, while cold-drawn square bar is suitable for projects requiring improved size control and precision processing.

With custom cutting service available according to customer drawings, Carbon Steel Square Bar can be supplied for mold blanks, machine tool rail pads, lifting tools, stamping blanks and container components. Each batch can be supplied with Mill Test Certificate for quality traceability.

Carbon Steel Square Bar

Chemical & Mechanical Property Snapshot

Grade	Standard	C (%)	Mn (%)	Si (%)	S (%) Max	P (%) Max	Yield Strength (MPa) Min	Tensile Strength (MPa)	Elongation (%) Min
Q195	GB/T 702	0.06–0.12	0.25–0.50	≤0.30	0.050	0.045	195	315–430	33
Q215	GB/T 702	0.09–0.15	0.25–0.55	≤0.30	0.050	0.045	215	335–450	31
Q235B	GB/T 702	≤0.20	0.30–0.70	≤0.35	0.045	0.045	235	370–500	26
Q355B	GB/T 702	≤0.20	1.00–1.60	≤0.50	0.040	0.040	355	470–630	21
S235JR	EN 10059	≤0.17	≤1.40	—	0.035	0.035	235	360–510	25
S355JR	EN 10059	≤0.24	≤1.60	—	0.035	0.035	355	470–630	21
A36	ASTM A675	≤0.29	≤1.03	≥0.15	0.050	0.040	250	400–550	20

Detailed Technical Specifications

Item	Specification
Product Name	Carbon Steel Square Bar
Material Type	Carbon Steel
Cross Section	Square Section
Standards	GB/T702, EN10059, ASTM A675
Product Forms	Hot-rolled / Cold-drawn
Hot-Rolled Size Range	10×10mm-200×200mm
Cold-Drawn Minimum Size	5×5mm
Common Hot-Rolled Sizes	12mm, 16mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 200mm
Hot-Rolled Dimensional Tolerance	±0.5mm to ±2mm
Cutting Service	Custom cutting according to customer drawings
Quality Certificate	Mill Test Certificate with heat number, chemical composition and mechanical test results
Packaging	Steel strapped bundles for seaworthy export packing
MOQ	5 Ton
Payment Terms	T/T, L/C at Sight
Delivery Time	7–15 working days after receiving deposit

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 is Carbon Steel Square Bar used for?

Carbon Steel Square Bar is widely used for mechanical equipment frames, steel structure supports, mold blanks, machine tool rail pads, lifting tools, stamping blanks and container components.

What standards does Carbon Steel Square Bar comply with?

Carbon Steel Square Bar is manufactured according to GB/T702, EN10059 and ASTM A675 standards.

What sizes are available for Carbon Steel Square Bar?

Hot-rolled square bar sizes range from 10×10mm to 200×200mm, while cold-drawn square bar can reach a minimum size of 5×5mm.

What is the difference between hot-rolled and cold-drawn square bar?

Hot-rolled square bar is mainly used for structural and general machining applications, while cold-drawn square bar is designed for smaller sizes and precision-oriented processing.

Can Carbon Steel Square Bar be customized?

Yes. Custom cutting service is available according to customer drawing requirements

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Carbon Steel Square Bar Manufacturer