AISI 1018 Cold Drawn Carbon Steel Round Bar, Equivalent Q235B Precision Solid Steel Rod

Ultra-tight dimensional tolerance ±0.02–0.05 mm for precision processing
Smooth bright surface, no mill scale, less machining allowance
AISI 1018 equivalent to Q235B, globally recognized low carbon grade
Excellent ductility, bending and welding performance
Ready for direct turning, stamping and component fabrication

Product Overview

AISI 1018 cold drawn carbon steel round bar is a low carbon cold finished solid steel rod, equivalent international grade Q235B. It is manufactured strictly under GB/T 905, ASTM A108, EN 10278 standards. This grade features smooth bright surface, ultra-precise dimension control and good ductility. Cold drawing process improves surface finish and straightness compared with hot rolled bar. It is widely used for precision shafts, mechanical pins, turned & milled parts, fastener blanks and general precision machinery components. Custom cut lengths and Mill Test Certificate are available for global customers.

Carbon Steel Round Bar

Chemical & Mechanical Property Snapshot

Item	AISI 1018 (Q235B Equivalent)
C (Carbon)	0.14%–0.20%
Si (Silicon)	≤0.10%
Mn (Manganese)	0.60%–0.90%
P (Phosphorus)	≤0.040%
S (Sulfur)	≤0.050%
Yield Strength	≥250 MPa
Tensile Strength	440–570 MPa
Elongation	≥25%
Hardness	≤126 HB

Detailed Technical Specifications

Specification Item	Details
Product Name	AISI 1018 Cold Drawn Carbon Steel Round Bar
Equivalent Grade	Q235B
Production Standard	GB/T 905, ASTM A108, EN 10278
Diameter Range	Φ3 mm – Φ80 mm
Surface Condition	Smooth, bright precision surface
Dimensional Tolerance	Ultra-tight tolerance ±0.02–0.05 mm
Length	3m – 6m or customized cut length
MOQ	5 Ton
Lead Time	7–15 working days after deposit
Certification	MTC, Mill Test Certificate
Package	Bundled with steel strips, anti-rust oil, seaworthy packing

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	Hot-Rolled Carbon Steel Round Bar	Cold-Drawn AISI 1018 Carbon Steel Round Bar
Surface Condition	Black surface with mill scale	Smooth, bright precision surface
Available Grades	Q235B, Q355B, 20#, 45#	AISI 1018
Equivalent International Grade	Q235B ≈ S235JR; Q355B ≈ S355JR; 20# ≈ 1020; 45# ≈ 1045	1018 ≈ Q235B; 1045 ≈ 45#; 20# ≈ 1020; 45# ≈ 1045
Manufacturing Standard	GB/T 702, ASTM A675, EN 10060	GB/T 905, ASTM A108, EN 10278
Diameter Range	Φ10 mm–Φ300 mm	Φ3 mm–Φ80 mm
Dimensional Tolerance	Standard hot-rolling industrial tolerance	Ultra-tight tolerance ±0.02–0.05 mm
Processing Characteristics	Suitable for rough machining, forging blanks, and structural fabrication	Suitable for precision machining and finished components; reduces secondary machining
Typical Applications	Forging blanks, shafts, structural parts, machinery components, foundation bolt blanks	Precision shafts, mechanical pins, turned & milled components, fastener blanks
Recommended Selection	Select for large-diameter, general structural, and rough-machining projects	Select for high-precision requirements, less material removal, and tight dimensional control

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Mechanical Shaft Components

Gear Blanks

Agricultural Machinery Parts

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is the equivalent grade of AISI 1018 cold drawn round bar?

AISI 1018 cold drawn round bar is equivalent to Q235B. It can replace Q235B for precision machining projects.

What are the advantages of cold drawn 1018 vs hot rolled Q235B?

Cold drawn 1018 has bright surface, tighter tolerance and better straightness, saves machining time for precision parts. Hot rolled Q235B is cheaper for large diameter rough structural use.

What are common applications of AISI 1018 cold drawn bar?

Precision shafts, mechanical pins, turned components, fastener blanks, stamping parts and general precision machinery parts.

Can you provide anti-rust treatment for AISI 1018 round bar?

Yes, we apply anti-rust oil on surface and seaworthy packaging for ocean shipment.

What is the MOQ and lead time?

MOQ is 5 tons, lead time 7–15 working days after receiving deposit.

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AISI 1018 Cold Drawn Carbon Steel Round Bar, Equivalent Q235B Precision Solid Steel Rod