Bearing Steel Bar - High-Carbon Chrome Steel for Precision Bearings

Technical Specifications of Bearing Steel Bar

Bearing Steel Bar - High-Carbon Chrome Steel for Precision Bearings

Bearing steel bar represents a specialized category of high-carbon chromium alloy steel specifically engineered for manufacturing rolling element bearings and precision mechanical components. This premium-grade material finds extensive application in automotive transmissions, industrial machinery, aerospace systems, and high-speed rotating equipment where exceptional hardness, wear resistance, and dimensional stability under cyclic loading are paramount. Manufactured to stringent metallurgical standards including AISI 52100, DIN 100Cr6, and JIS SUJ2, bearing steel bars serve critical roles in applications demanding fatigue resistance exceeding 10^9 stress cycles.

What is Bearing Steel Bar?

Bearing steel bar is a through-hardening alloy steel containing approximately 0.95-1.10% carbon and 1.30-1.60% chromium, designed to achieve surface hardness of 58-65 HRC after heat treatment. The material exhibits superior resistance to rolling contact fatigue, maintains microstructural stability at operating temperatures up to 150°C, and demonstrates exceptional dimensional precision with diameter tolerances achievable to ISO h6 grade.

Bearing Steel Bar Technical Specifications

Typical chemical composition per ASTM A295 includes carbon 0.98-1.10%, chromium 1.30-1.60%, manganese 0.25-0.45%, silicon 0.15-0.35%, with phosphorus and sulfur limited to 0.025% maximum each. Material is supplied in annealed condition with hardness not exceeding 241 HBW, featuring microstructure of fine pearlite with uniformly distributed spheroidized carbides. Standard manufacturing sizes range from 10mm to 150mm diameter in hot-rolled or cold-drawn finish, with length availability up to 6 meters conforming to EN 10084:2008 dimensional requirements.

Why Choose Our Bearing Steel Bar

Our bearing steel bars are produced through vacuum degassing and continuous casting processes, ensuring oxygen content below 10 ppm and non-metallic inclusion ratings meeting Grade A per ASTM E45 Method A. Each production lot undergoes ultrasonic testing to SEP 1921 Class 3 standards, guaranteeing material integrity for critical bearing applications. We maintain ISO 9001:2015 certified quality systems with full traceability from steel mill to delivery, providing material test certificates documenting chemical analysis, mechanical properties, and heat treatment records.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ is 5 metric tons per specification, though we accommodate smaller quantities of 1-2 tons for specialized diameters or custom chemical compositions with adjusted lead times. Mixed-size orders meeting the 5-ton threshold qualify for standard mill-direct pricing.

Do you provide material test certificates?

Yes, we supply EN 10204 Type 3.1 certificates with every shipment, documenting chemical composition per heat analysis, tensile properties, hardness values, and grain size measurements. Additional certifications including ultrasonic test reports and decarburization depth analysis are available upon request at quotation stage.

What is the typical delivery time?

Standard diameter bearing steel bars (20-80mm) in annealed condition ship within 25-35 days from order confirmation for stock specifications. Custom sizes or special heat treatment conditions require 45-60 days manufacturing lead time, depending on mill production schedules and quantity ordered.

Can you cut to custom sizes?

We offer precision cutting services with tolerances to ±1mm for lengths between 500mm to 6000mm. Cold-saw cutting maintains material properties without introducing thermal stress, and cut ends can be faced and chamfered per drawing specifications. Cutting charges apply based on quantity and complexity, detailed in quotation.

Get a Competitive Quote for Bearing Steel Bar

Contact our technical sales team for factory-competitive pricing on bearing steel bar tailored to your application requirements. We provide cost-effective solutions with mill test documentation, custom cutting services, and logistics support for projects ranging from prototype development to high-volume production. Request your detailed quotation today, including material specifications, quantity requirements, and delivery destination for accurate lead time and freight cost assessment.