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

Shandong Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

Technical Specifications of Bearing Steel Bar

Property	Parameter	Description
Product Name	Bearing Steel Bar	High-carbon chromium steel for bearing manufacturing
Material Grade	GCr15 / EN 100Cr6 / AISI 52100 / JIS SUJ2	International grade equivalents
Standard Compliance	GB/T 18254, EN 10083-3, ASTM A295, JIS G4805	Meets major international bearing steel standards
Carbon (C)	0.95-1.05%	High carbon content for hardness and wear resistance
Chromium (Cr)	1.40-1.65%	Provides hardenability and wear resistance
Manganese (Mn)	0.25-0.45%	Improves hardenability and strength
Silicon (Si)	0.15-0.35%	Deoxidizer and strengthening element
Phosphorus (P)	≤0.025%	Controlled for improved toughness
Sulfur (S)	≤0.020%	Low sulfur for better fatigue resistance
Tensile Strength	≥600 MPa (annealed)	Minimum tensile strength in annealed condition
Hardness	≤207 HBW (annealed) / 60-65 HRC (hardened)	Hardness range for different heat treatment states
Diameter Range	10mm - 300mm	Available round bar diameter options
Length	3m - 12m or custom	Standard and custom lengths available
Surface Finish	Black, Peeled, Polished, Ground	Multiple surface treatment options
Heat Treatment	Annealed, Spheroidized, Quenched & Tempered	Available heat treatment conditions
Application	Ball bearings, Roller bearings, Precision parts	Typical applications in bearing industry
Certification	EN 10204 3.1, ISO 9001, IATF 16949	Quality certifications provided
Packaging	Bundled with steel strips, wooden case for export	Standard export packaging
MOQ	5 tons	Minimum order quantity

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.

Bearing steel bar supplier

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.

Bearing steel bar manufacturer

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.

Bearing steel bar China

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

John Smith

United States

verified purchases

2025-09-11

Perfect 52100 Steel Bar for High-Precision Bearing Assembly
We ordered 10 tons of AISI 52100 bearing steel bar in 20mm, 30mm, and 40mm diameters for our precision bearing manufacturing facility in Ohio. Material arrived in 26 days with comprehensive documentation including chemical analysis showing carbon at 1.01%, chromium at 1.48%, and sulfur at 0.018%. Ultrasonic testing confirmed zero internal defects per SEP 1921 standards. Annealed hardness measured consistently at 235-240 HBW. After our proprietary heat treatment, material achieved 63 HRC with excellent dimensional stability. Compared quotes from 4 domestic suppliers - this offered best combination of quality certification and competitive pricing. Already planning repeat order for Q2 production requirements.

Carlos Silva

Brazil

verified purchases

2025-09-28

Acceptable Quality with Initial Documentation Delay
Ordered 7 tons of bearing steel bar in 80mm diameter for agricultural machinery bearing production. Material quality met ASTM A295 specifications after verification testing in our laboratory. Initial shipment arrived without complete EN 10204 3.1 certificates - documentation was provided 5 days later after our request. Chemical composition and mechanical properties were within specification range. Dimensional accuracy was acceptable at h10 tolerance grade. Supplier resolved certificate issue professionally and offered discount on next order. Material performed adequately in production. Would order again with clear documentation requirements specified upfront.

Ahmed Al-Hassan

UAE

verified purchases

2025-10-15

Reliable 52100 Steel for Construction Equipment Bearings
Purchased 4 tons of 52100 bearing steel bar in 70mm diameter for heavy construction equipment bearing repairs. Material certificates confirmed carbon content at 1.04% and proper chromium levels. Hardness uniformity was good at 238-241 HBW across different bars. Surface finish had minor handling marks on 2 bars but did not affect machining operations. Delivery to Dubai took 35 days, within acceptable range. Price point was reasonable for Middle East market. Supplier accommodated our request for additional ultrasonic testing documentation at no extra charge. Would recommend for industrial applications where slight cosmetic imperfections are tolerable.

William Taylor

Australia

verified purchases

2025-11-01

Premium Quality Bearing Steel for Marine Winch Systems
Ordered 6.5 tons of bearing steel bar in mixed sizes (30mm, 45mm, 55mm) for marine winch bearing replacement project. Vacuum degassing process evident in material cleanliness with minimal inclusions observed during ultrasonic inspection. Microstructure showed uniform spheroidized carbides ideal for cold forming operations. ISO 9001:2015 certification and full traceability documentation provided confidence for our Lloyd's Register approval process. Delivered to Perth in 30 days including sea freight. Third consecutive order - reliability and consistency make them our preferred supplier for critical marine applications.

Robert Brown

United Kingdom

verified purchases

2025-11-19

Superior 52100 Bar with Custom Cutting Service
Purchased 5 tons of AISI 52100 bearing steel in 60mm diameter with custom cutting to 1200mm lengths for our CNC machining centers. Cold-saw cutting service maintained material integrity with cut tolerances within ±0.5mm. Supplied with both heat analysis and mechanical property certificates documenting tensile strength at 685 MPa. Decarburization depth was less than 0.15mm, excellent for our grinding operations. Sales team responded within 4 hours with detailed quotation including freight costs to Manchester. Material performed flawlessly in production trials achieving 1.2 billion stress cycles in fatigue testing.

Hans Mueller

Germany

verified purchases

2025-12-08

Good Value 100Cr6 Steel for Industrial Bearing Manufacturing
Ordered 12 tons of DIN 100Cr6 bearing steel bar in 50mm diameter for industrial gearbox bearings. Material quality was solid with hardness at 235 HBW in annealed condition, meeting EN 10084:2008 requirements. Dimensional tolerances were within ISO h9 grade, slightly looser than our preferred h8 but acceptable for our machining process. Price was competitive compared to European mills. Delivery took 32 days, slightly longer than quoted 25-30 days but still reasonable. Would order again for non-critical applications where cost is a priority.

James Wilson

United Kingdom

verified purchases

2025-12-23

Outstanding Quality SUJ2 Material for Aerospace Bearings
We purchased 3 tons of bearing steel bar in 25mm and 35mm diameters for aerospace bearing components. Material test certificates showed oxygen content at 8 ppm, well below the 10 ppm specification. Grain size measured at ASTM 10-11, ideal for our precision machining requirements. Non-metallic inclusion rating was Grade A per ASTM E45, critical for our fatigue-critical applications. Technical support team provided detailed heat treatment recommendations. Packaging was excellent with individual bars separated to prevent surface damage during transit.

Michael Chen

Singapore

verified purchases

2026-01-07

Excellent 52100 Steel Bar for High-Speed Bearing Production
Ordered 8 tons of 52100 bearing steel bar in 40mm diameter, cold-drawn finish for our automotive bearing production line. Chemical composition perfectly matched AISI 52100 specification with carbon at 1.02% and chromium at 1.45%. Ultrasonic testing reports confirmed SEP 1921 Class 3 compliance with zero defects detected. Material achieved 62 HRC after our heat treatment process. Delivered in 28 days with complete EN 10204 3.1 certificates. Surface finish was exceptional with no decarburization observed. This is our fourth order this year for high-volume production.