ASTM 1018 Cold Rolled Round Steel Bar Supplier

AISI 1018 CARBON STEEL BAR SUPPLIER | ZHONGJING

【Specification】:100MM~1200MM；customization size

【Length】：12M;

【Material】：Carbon steel

【Surface】:  Black,Bright&Polish

【Standard】:AISI;ASTM:GB;DIN;BS;JIS

【Technique】: cold rolled& hot rolled

【Section Shape】: round & flat

【Stock】: yes

【MOQ】: 5 TON

【Processing Service】:Bending, Welding, Punching, Cutting

【Transport Package】 : Water Proof Paper Suitable for Transportation

【Application】：Push plate, locking wedge, die sleeve, reset rod.

Overview

ASTM 1018 Cold Rolled Round Steel Bar is a premium-quality carbon steel product renowned for its excellent machinability, formability, and consistent mechanical properties. With a nominal carbon content of 0.18%, this bar strikes a balance between the softness of low-carbon steels and the moderate strength needed for precision mechanical components. Produced through cold rolling, the bar undergoes a series of passes through precision rollers to achieve tight dimensional tolerances (diameter: ±0.0005 inches) and a smooth, bright surface finish, eliminating the need for additional machining in many applications.

1018 cold-rolled bars exhibit a uniform microstructure with fine-grained ferrite-pearlite, providing superior ductility for cold forming and excellent response to heat treatment—though they are typically used in the as-rolled condition for most applications. Commonly conforming to ASTM A108 and SAE 1018 standards, these bars are available in various diameters (0.125–6 inches) and lengths, making them ideal for producing high-precision parts in automotive, aerospace, and general engineering industries.

Advantages

Precision Dimensional Accuracy: Cold rolling ensures minimal diameter variation, critical for components requiring tight fits, such as shafts, pins, and bearings.

Superior Machinability: Soft texture (120–150 HB hardness) allows for fast cutting speeds and smooth chip formation, reducing machining time and tool wear.

Balanced Mechanical Properties: Yield strength of 35,000–45,000 PSI and elongation of 25–30% provide both formability for cold heading/swaging and strength for load-bearing parts.

Excellent Surface Finish: Free from scale, pits, or imperfections, suitable for direct plating, painting, or as a cosmetic surface in 外露 components.

Heat Treatment Responsiveness: Can be case-hardened via carburizing to achieve hard surfaces (up to 60 HRC) while maintaining a ductile core, ideal for wear-resistant applications.

Application

ASTM 1018 Cold Rolled Round Steel Bar is used in:

Automotive Components: As drive shafts, axles, steering rods, and suspension parts that require a combination of strength, formability, and precise fit.

Aerospace Industry: For non-critical fasteners, brackets, and hinges where dimensional accuracy and lightweight design (via cold-rolled thin diameters) are essential.

Industrial Machinery: In gears, pins, bushings, and conveyor rollers, often case-hardened to enhance wear resistance without compromising toughness.

Precision Instruments: For shafts in motors, pumps, and valves, leveraging the bar's straightness and surface finish to minimize friction and vibration.

General Fabrication: As a versatile material for custom machine parts, jigs, and fixtures, especially where tight tolerances and ease of machining are priorities.

FAQ

Q: What is the difference between hot-rolled and cold-rolled 1018 round bars?

A: Hot-rolled bars have a rough surface, larger tolerances, and lower strength, while cold-rolled bars offer smooth surfaces, precise dimensions, and slightly higher strength due to work hardening.

Q: Can 1018 bars be welded?

A: Yes, their low carbon content (0.18%) makes them highly weldable with MIG, TIG, or stick welding. Preheating is usually unnecessary for thin sections.

Q: What is the maximum diameter available for cold-rolled 1018 bars?

A: Standard diameters go up to 6 inches, but custom sizes can be produced via specialized rolling or drawing processes for larger applications.

Q: How should I store cold-rolled round bars to prevent corrosion?

A: Store in dry environments, preferably coated with a light oil or rust inhibitor. Avoid contact with moisture or corrosive gases, and use protective packaging for long-term storage.