Bearing Steel Bright Bar
Introduction:
Bearing steel bright bar is an ultra-high-purity high-carbon chromium precision finished steel bar. It is produced via the full-process manufacturing route of EAF smelting, LF refining, VD vacuum degassing, continuous casting and precise controlled rolling.With strict control of oxygen content, non-metallic inclusions and carbide uniformity, the material delivers ultra-stable hardness, superior wear resistance, excellent contact fatigue strength and reliable dimensional stability after heat treatment.
Product Overview
Bearing steel bright bar is an ultra-high-purity high-carbon chromium precision finished steel bar. It is produced via the full-process manufacturing route of EAF smelting, LF refining, VD vacuum degassing, continuous casting and precise controlled rolling. With strict control of oxygen content, non-metallic inclusions and carbide uniformity, the material delivers ultra-stable hardness, superior wear resistance, excellent contact fatigue strength and reliable dimensional stability after heat treatment. According to customer precision and surface requirements, finished products can be selectively processed by cold drawing, centerless turning (peeling) and centerless grinding. The product covers a diameter range of ø12–120 mm, including domestic high-end bearing grades and international equivalent standards of Europe, Japan and the United States: GCr15, GCr15-2, GCr15-3, GCr15SiMn, SAE52100, SUJ2, 100Cr6, GCr15-K2, LYHB55, S53C, S55C, SAE1055, G65Mn. Available in spheroidized annealed precision bright finished state, it features mirror smooth surface, no oxide scale, no scratches and precise dimensional tolerance. Widely applied in high-precision 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.
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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 |
Mirror bright, oxide-free, scratch-free, burr-free, ultra-smooth finish |
|
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: Adopt EAF+LF+VD triple smelting process, strictly control oxygen content and sulfide/oxide inclusions, effectively avoid early fatigue spalling of precision bearings and improve service life.
2. Uniform Spheroidized Carbide Structure: Online controlled cooling + special spheroidizing annealing process ensures tiny and evenly distributed carbides. The hardness is stably controlled at HB179–207, facilitating smooth cold heading, turning and precision forming.
3. Flexible Optional Precision Processing: Three mature finishing processes are optional according to demand: cold drawing for ultra-precise dimensional tolerance, centerless turning (peeling) for thorough removal of surface defects and decarburized layer, centerless grinding for mirror ultra-smooth bright surface.
4. Graded High-Purity Grade System: Cover conventional GCr15 and upgraded ultra-clean series including GCr15-2, GCr15-3, GCr15-K2 and LYHB55, perfectly matching low, medium and high-end precision bearing manufacturing needs.
5. Stable Heat Treatment Performance: Consistent hardenability range. After quenching and tempering, the hardness reaches uniform HRC61–65, with excellent wear resistance and contact fatigue strength, suitable for long-term high-load operation.
6. Complete Domestic & International Specifications: ø12–120mm full-size coverage, compatible with GB, EN, ASTM, JIS standards, realizing one-stop supply for domestic and export high-precision bearing manufacturers.
Main Application Fields
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Civil Precision Bearing Manufacturing
High-precision bright bars for inner and outer rings, steel balls, cylindrical rollers, tapered rollers and needle rollers of automobiles, motors, wind power equipment, engineering machinery and household appliance bearings.
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High-Speed Ultra-Precision Bearings
Ultra-clean grades LYHB55 and GCr15-3 bright bars are specially used for machine tool spindle bearings, high-speed motor bearings and precision instrument bearings with strict surface and tolerance requirements.
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Medium and Large Heavy-Duty Bearings
GCr15SiMn large-diameter precision bright bars for wind turbine bearing rings and mining equipment heavy-load bearing core parts.
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Export Standard Bearing Parts
International grades 100Cr6, SAE52100 and SUJ2 bright bars fully meet overseas standards, supporting batch supply of export bearing supporting raw materials.
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Precision Wear-Resistant Mechanical Components
S53C, S55C and SAE1055 high-precision bright bars for wear-resistant shafts, guide sleeves, precision gears and cold heading fasteners.
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Miniature Elastic Bearing Accessories
G65Mn bright bars for bearing spring washers, snap rings and 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. Professional Exclusive Packaging for Bright Bars: Adopts special scratch-proof and rust-proof precision packaging for bright bars, wrapped with thickened waterproof film on the outer layer and firmly bundled and fixed. High-precision and long-size products can be customized with solid wooden box packaging, completely avoiding collision, scratches, deformation and rust during transportation, suitable for long-distance sea and land transportation.
- 5. MOQ: 1 ton per grade; mixed grades and mixed sizes can be loaded in one container.
- 6. Custom Processing: Optional cold drawing, centerless turning (peeling), centerless grinding, spheroidizing annealing, fixed-length cutting, shot blasting, stress relief heat treatment and non-destructive testing.
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- 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.
