T: +86-0731-85185770
E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
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Grade: AISI 52100
Equivalent Steel: GB GCr15, JIS SUJ2, DIN 100Cr6/1.3505, BS EN31/535A99, GOST IIIX15
The performance of 52100 steel is rooted in its high-carbon chromium composition, featuring carbon in the range of 0.93%–1.05% and chromium between 1.35% and 1.60% to secure adequate hardenability and carbide formation. Minor alloying additions of manganese (0.25%–0.45%) and silicon (0.15%–0.35%) aid in deoxidation and solution strengthening. Together, these elements yield superior hardness retention and robust resistance to rolling-sliding wear, which explains its widespread use in high-integrity bearing systems.
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52100
Qilu
AISI 52100 steel (UNS G52986) is a premium high‑carbon chromium through‑hardening bearing alloy, widely recognised as the global benchmark for anti‑friction rolling‑element components. Also equivalent to DIN 100Cr6 (1.3505), JIS SUJ2 and GB GCr15, this grade delivers outstanding rolling‑contact fatigue resistance, extreme surface hardness and stable dimensional performance after proper heat treatment. We supply hot‑rolled, forged and turned 52100 steel bars with strict metallurgical cleanliness control, covering both air‑melt and vacuum‑remelt (VAR) quality grades for general‑purpose and high‑end industrial requirements.
Country | USA | Germany | China | British | Japan |
Standard | ASTM A29 | DIN 17230 | GB/T 18254 | BS970 | JIS G4805 |
Grade | 52100 | 100Cr6/1.3505 | GCr15 | EN31/535A99 | SUJ2 |
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
52100 | 0.93-1.05 | 0.15-0.35 | 0.25-0.45 | 0.025Max | 0.015Max | 1.35-1.60 | / | / |
100Cr6/1.3505 | 0.90-1.05 | 0.15-0.35 | 0.25-0.45 | 0.030Max | 0.025Max | 1.35-1.65 | / | 0.30Max |
GCr15 | 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | 0.025Max | 0.020Max | 1.40-1.65 | 0.10Max | 0.25Max |
SUJ2 | 0.95-1.10 | 0.15-0.35 | 0.50Max | 0.025Max | 0.025Max | 1.30-1.60 | 0.08Max | 0.25Max |
In the annealed condition, 52100 steel exhibits a maximum hardness of HB 207, which supports excellent machinability. Following oil quenching and low-temperature tempering, the material reaches a Rockwell hardness range of HRC 58 to 62, with uniform hardness distribution maintained between the surface and core sections even in larger cross-sectional dimensions. The tensile strength of this grade exceeds 860 MPa, accompanied by a yield strength above 520 MPa. It is important to note that this steel shows certain sensitivity to flake formation; therefore, controlled slow cooling or isothermal annealing is strongly recommended after forging or rolling operations to mitigate hydrogen-induced embrittlement risks.
Product type | Size range | Length |
Hot rolled bar | Φ8-Φ270mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:20-120mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
Annealing: 790‑810 ℃ hold, slow furnace cooling, target hardness ≤217 HB
Quenching: Austenitize at 830‑860 ℃, oil quenching
Tempering: 150‑180 ℃ for 2‑4 hours, air cool, final hardness HRC 60‑66
AISI 52100 steel dominates bearing manufacturing and extends to many high‑wear mechanical components:
ball bearings, roller bearings, bearing rings & steel balls
wheel bearings, transmission parts, high‑load shaft components
machine‑tool spindles, precision shafts, rollers, heavy‑duty gears
high‑wear jigs, gauges, simple cold‑work tool parts
pump shafts, valve core, high‑stress wear‑resistant pins
A1: They are equivalent bearing‑steel grades. 52100 is SAE/AISI US designation; 100Cr6 (1.3505) is DIN‑EN European designation. Chemical and mechanical requirements are highly aligned for most industrial interchange scenarios.
A2: Welding is not recommended. High carbon‑chromium composition brings high cold‑cracking tendency. If welding is unavoidable, strict pre‑heat and post‑heat procedures must be applied.
A3: VAR (Vacuum Arc Remelting) improves steel internal cleanliness, reduces non‑metallic inclusions, further boosts contact‑fatigue life. Mainly used for high‑end aerospace, premium bearing requirements.
A4: Hot‑rolled black skin, forged rough surface, peeled / turned bright surface. We also provide fixed‑length cutting service.
For customized quotes, stock availability, or technical support, please feel free to contact us.
