Bearing Steel Round Bar
Introduction:
Bearing steel round bar is ultra-high-purity high-carbon chromium steel produced via EAF + LF refining + VD vacuum degassing + continuous casting + precise controlled rolling. Strictly control oxygen content, non-metallic inclusions and carbide uniformity to guarantee high hardness, outstanding wear resistance, excellent contact fatigue strength and dimensional stability after heat treatment.
Product Overview
Bearing steel round bar is ultra-high-purity high-carbon chromium steel produced via EAF + LF refining + VD vacuum degassing + continuous casting + precise controlled rolling. Strictly control oxygen content, non-metallic inclusions and carbide uniformity to guarantee high hardness, outstanding wear resistance, excellent contact fatigue strength and dimensional stability after heat treatment. The product diameter covers ø12–120 mm, including domestic premium bearing grades, European, Japanese and American equivalent standards: GCr15, GCr15-2, GCr15-3, GCr15SiMn, SAE52100, SUJ2, 100Cr6, GCr15-K2, LYHB55, S53C, S55C, SAE1055, G65Mn. Available in hot-rolled black bar, spheroidized annealed bar and peeled bright bar, mainly used for bearing rings, steel balls, rollers, precision wear-resistant shafts, cold heading fasteners and high-strength elastic components.
Representative Grades
|
Grade |
Executive Standard |
Core Advantages & Application |
|
GCr15 / GCr15-2 / GCr15-3 / GCr15-K2 |
GB/T 18254 |
Standard high-carbon chromium bearing steel; GCr15-2/GCr15-3/GCr15-K2 with lower oxygen & cleaner inclusion for high-end bearings, bearing balls, rollers, small bearing rings |
|
GCr15SiMn |
GB/T 18254 |
Added silicon manganese, better hardenability, for large-size bearing rings, heavy-load bearing parts |
|
100Cr6 / SAE52100 / SUJ2 |
EN ISO 683-17 / ASTM A295 / JIS G4805 |
International universal bearing steel, fully equivalent to standard GCr15, export bearing parts |
|
LYHB55 |
Factory special premium bearing steel |
Ultra-low oxygen, fine carbide, long fatigue life for high-speed precision bearings |
|
S53C / S55C / SAE1055 |
JIS G4051 / ASTM A29 |
Medium carbon high-quality carbon steel, moderate hardness, cold forming performance good, for medium-load wear shafts, fasteners |
|
G65Mn |
GB/T 1222 |
Carbon manganese spring bearing composite steel, good elasticity & wear resistance, miniature bearing elastic accessories, spring pins |
Grade Description
-
01
GCr15 series: G = Bearing steel mark, Cr = Chromium alloy element, 15 = average chromium content about 1.5%; suffix 2/3/K2 represent upgraded high-purity grades with stricter oxygen and inclusion limits.
-
02
GCr15SiMn: On the basis of GCr15 adding Si, Mn elements, improve hardenability, suitable for large cross-section bearing parts.
-
03
100Cr6 / SAE52100 / SUJ2: International universal bearing steel grades, consistent chemical composition and mechanical properties with domestic GCr15, for overseas export orders.
-
04
LYHB55: Custom-made high-end, high-purity bearing steel with fine and uniform carbides and extremely low oxygen content, specially supplied for high-speed precision bearings.
-
05
S53C, S55C, SAE1055: Medium-carbon high-quality carbon steel, which combines wear resistance and cold working performance, and is mostly used for medium-load wear-resistant shafts and standard parts.
-
06
G65Mn: Manganese-based steel for both springs and bearings, combining elasticity and wear resistance, used for elastic components and spring pins in miniature bearings.
Product Specifications
|
Item |
Specific Parameters |
|
Product Form |
Hot rolled round bar;Spheroidized annealed bar ;Peeled bright bar |
|
Diameter Range |
ø12 mm – ø120 mm |
|
Standard Length |
3m / 6m / 9m; support customized fixed-length cutting |
|
Delivery Condition |
Hot rolled (AR) / Spheroidized annealing (SPHA) / Normalized / Peeled & ground |
|
Surface State |
Hot rolling oxide scale; shot blasting, peeling, polishing optional |
|
Size Tolerance |
Meet GB/T 702, EN 10060, JIS G4805 tolerance standards |
|
Decarburization Control |
Ultra-thin total decarburization layer, strictly limited per bearing steel national standard |
|
Straightness |
Standard grade ≤3mm/m; precision peeled bar ≤1.5mm/m |
Core Advantages
1. Ultra-High Metallurgical Cleanliness: EAF+LF+VD triple smelting, oxygen content strictly controlled, low oxide and sulfide inclusions, effectively avoid bearing early fatigue spalling.
2. Uniform Spheroidized Carbide Structure: Online controlled cooling + special spheroidizing annealing, tiny and evenly distributed carbides, stable hardness HB179–207, easy cold heading, turning and forming.
3. Graded High-Purity Series Available: Conventional GCr15 and upgraded ultra-clean grades (GCr15-2, GCr15-3, GCr15-K2, LYHB55) to match low, medium and high-end bearing production demands.
4. Complete Domestic & International Grade System: Cover GB, EN, ASTM, JIS standard bearing steel and special customized grades, one-stop supply for domestic and export manufacturers.
5. Excellent Heat Treatment Stability: Stable hardenability; after quenching and tempering, uniform hardness HRC61–65, high wear resistance and contact fatigue performance.
6. Wide Size Coverage ø12–120mm: Cover miniature bearing raw materials to medium-sized heavy bearing blanks, support diversified deep processing customization.
Main Application Fields
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Rolling Bearing Manufacturing
Inner/outer bearing rings, steel balls, cylindrical rollers, tapered rollers, needle rollers for automobile, motor, wind power, machinery, household appliance bearings.
-
High-Speed Precision Bearings
LYHB55, GCr15-3 ultra-clean grades for machine tool spindle bearings, high-speed motor bearings, precision instrument bearings.
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Medium-Large Heavy-Duty Bearings
GCr15SiMn large-diameter bar for wind turbine bearing rings, mining equipment heavy load bearings.
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Export Bearing Parts
100Cr6, SAE52100, SUJ2 international grades for overseas bearing factory supporting raw materials.
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Precision Wear-Resistant Mechanical Parts
S53C, S55C, SAE1055 for wear-resistant shafts, guide sleeves, gears and cold heading fasteners.
-
Elastic Bearing Accessories
G65Mn for bearing spring washers, snap rings, miniature elastic positioning pins.
Packaging & Services
- 1. Executive Standards: GB/T 18254, EN ISO 683-17, ASTM A295, JIS G4805; support customized factory special standards such as LYHB55.
- 2. Full Inspection Items: Chemical composition, oxygen content test, hardness test, metallographic carbide rating, decarburization detection, non-metallic inclusion grading, grain size inspection; optional ultrasonic flaw detection (UT), eddy current testing (ET).
- 3. Material Certification: EN10204 MTC 3.1 mill test certificate; SGS, BV third-party inspection reports available.
- 4. Packaging: Steel wire bundled, waterproof plastic film wrapped, end anti-collision caps; container and bulk vessel shipment supported.
- 5. MOQ: 1 ton per grade; mixed grades and mixed sizes can be loaded in one container.
- 6. Custom Processing: Spheroidizing annealing, peeling & grinding, fixed-length cutting, shot blasting, stress relief heat treatment, non-destructive testing.
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Contact Us
- WhatsApp: +86-185 9567 2991
- Email: martinliu@rongtianmetal.com
- Tel: +86-185 9567 2991
- Address: 8F, Bldg 2, Jinke Zhihui Valley No. 65 Hongyuan Rd., Jinshui Dist. Zhengzhou, China.
