100Cr6 52100 1.3505 SUJ2 alloy structural steel
100Cr6 alloy structural steel offers excellent wear resistance, high hardness, and good dimensional stability. With good hardenability and fatigue strength, ideal for bearings, rolling elements, and other high-load precision components.
- Standard: ISO 100Cr6, AISI 52100, DIN 1.3505, JIS SUJ2, GB GCr15
- Technique: EAF + LF + VD or ESR, forged or hotrolled, multidirectional forging ratio ≥4, spheroidized annealed
- Shape: Round, Flat, Plates, Blocks
- Heat treatment: Supplied in spheroidized annealed condition, hardness ≤207 HBW; quenched and tempered (QT) to 58–62 HRC available on request
- Surface Treatment: Turned, milled / ground, sawn ends. Black (hotrolled / forged surface) available for large sections
- Tolerance: flat bars & plates thickness: +0.5/-0.0 mm (turned); forged blocks: ±0.2 mm
- MOQ: 1 Ton
We supply ISO 100Cr6 in various custom sizes
plate
flat
block
round size range
- Diameter: φ10-1200 mm
Chemical Composition (%)
Grade | C | Si | Mn | P (≤) | S (≤) | Cr | Mo (≤) | Ni (≤) | Cu (≤) |
100Cr6 （1.3505） | 0.93–1.05 | 0.15–0.35 | 0.25–0.45 | 0.035 | 0.035 | 1.35–1.60 | 0.06 | 0.30 | 0.30 |
52100 | 0.93–1.05 | 0.15–0.35 | 0.25–0.45 | 0.025 | 0.015 | 1.30–1.60 | 0.10 | 0.25 | 0.30 |
SUJ2 | 0.95–1.10 | 0.15–0.35 | ≤0.50 | 0.025 | 0.025 | 1.30–1.60 | 0.08 | 0.25 | 0.25 |
GCr15 | 0.95–1.05 | 0.15–0.35 | 0.25–0.45 | 0.025 | 0.025 | 1.40–1.65 | 0.10 | 0.30 | 0.25 |
Main characteristics of 100Cr6 alloy steel
- Excellent wear resistance – extends bearing service life
- High hardness – withstands heavy rolling contact stress
- Good dimensional stability – maintains precision under load
- Superior fatigue strength – reliable under repeated stress cycles
100Cr6| 52100 | 1.3505 | SUJ2 alloy steel applications
100Cr6 steel for Rolling Bearing Rings & Rolling Elements
High carbon-chromium steel delivers superior wear resistance and contact fatigue strength, ensuring long life and low noise in precision bearings.
100Cr6 steel for Precision Gauge & Measuring Tool
Exceptional dimensional stability after heat treatment and high attainable hardness make it ideal for gauges, master blocks, and precision instruments requiring lasting accuracy.
100Cr6 steel for Fuel Injection System Plunger
Excellent anti-galling properties and wear resistance under high pressure ensure reliable, leak-free performance in precision fuel injection pairs.
Our Production Technology For 100Cr6 (1.3505 / AISI 52100 / SUJ2 / GCr15) Through-Hardening Bearing Steel
- EAF — primary melting
- LF — secondary refining and alloy adjustment
- VD — removal of gases and inclusions
- ESR — optional for premium cleanliness and isotropy
- VIM + VAR — for ultra-high cleanliness grades
- Forged or Hot Rolled
- Spheroidized Annealed — for optimum machinability
- Machined surface / Peeled / Black finish
- Ultrasonic testing (UT) 100% as per SEP 1921, ASTM A388, or EN 10228-3 (upon request)
- Micro Cleanliness as per ASTM E45 — ultra-low oxygen content required for bearing applications
- Grain size as per ASTM E112 (fine and homogeneous structure required prior to transformation)
- Delivery condition options:Spheroidized annealed (+A): max. 207 HBWSpheroidized annealed and cold worked: max. 241 HBWQuenched and tempered (+QT): 60–65 HRC (typical after final heat treatment)
- Mechanical properties as per ISO 683-17, ASTM A295, or EN 10027
mechanical properties & heat treatment of 100Cr6 steel
| Heat temperature | Start forging temperature | Finish forging temperature | Cooling method |
| 1150 – 1200 °C | 1150 – 1200 °C | ≥ 850 °C | Pit, sand, or furnace cooling |
Annealing
- Annealing temperature: 790 – 810°C.Alternative range: 760 – 810°C
- Hold at temperature for sufficient time (typically 2–4 hours, depending on section thickness)
- Cool slowly in the furnace (controlled cooling)
- Hardness after annealing: max. 207 HBW.For cold-worked material: max. 241 HBW
- Annealing in a protective atmosphere is recommended to reduce decarburization and surface scaling
Hardening
- 100Cr6 is a through-hardening bearing steel. The final heat treatment gives possibilities for either bainitic or martensitic final structure depending on the trade-off required between toughness and hardness. Proper preheating and austenitizing are critical to achieve the desired hardness without cracking or excessive distortion
- Pre-heating (recommended): Preheat to 600 – 650°C to reduce thermal shock during austenitizing
- Austenitizing temperature: 830 – 870°C.Alternative range: 790 – 840°C.For oil quenching: 830 – 870°C.For water quenching: 830 – 870°C
- Holding time: At least 30 minutes per 25mm of section thickness (minimum 30 minutes)
- Quenching media:Oil (preferred for most sections) — provides good hardness with moderate distortionWater — for larger sections or when maximum hardness is required (increased crack risk)Martempering (hot bath) — for minimum distortion in complex shapes
- Hardness after quenching: 60 – 65 HRC.Oil quenched from 830–870°C: 62 – 64 HRC.Water quenched: 64 – 66 HRC
Stress relieving
- Perform after rough machining, heavy stock removal, or other cold working operations to reduce residual stresses
- Heat carefully to 600 – 650°C (below the tempering temperature)
- Hold at temperature for 1 hour per 25mm of section thickness (minimum 2 hours)
- Air cool after holding
- This operation reduces the risk of distortion during final heat treatment and improves dimensional stability
Tempering
- Temper immediately after the workpiece cools to hand-warm temperature (approx. 50–70°C). Delayed tempering may cause cracking
- Number of tempers: Minimum 1 time for standard applications; 2 times recommended for critical components requiring maximum toughness and property stability
- Holding time: 1 hour per 25mm of section thickness (minimum 2 hours)
- Cooling method: Air cool after each tempering cycle
- Tempering temperature range: 150 – 300°C.150 – 180°C: For maximum hardness (60–65 HRC) with good wear resistance180 – 250°C: For balanced hardness and toughness (hardness decreases from ~808 HV to ~665 HV)250 – 300°C: For improved toughness with slightly reduced hardness
Why Choose NSPM as Your 100Cr6 alloy steel Supplier
Source Direct
Direct mill cooperation ensures stable supply, competitive pricing, and consistent quality. Global resource integration and strong supply chain management guarantee reliable material sourcing and long-term availability.
Stock Ready
50,000+ tons inventory across 11 warehouses enables fast delivery. Flexible cutting, short lead times, and ready stock support urgent demands and improve customers’ production efficiency.
Expert Team
600+ professionals, including R&D specialists and technical engineers, provide application-driven support. Fast response and deep tooling knowledge ensure accurate solutions for diverse industrial needs.
Fully Inspected
Strict quality control system with full traceability, UT testing, and heat treatment records. Certified standards (ISO, CE) ensure every material meets high-performance and reliability requirements.
Full-Chain Machining
From steel supply to precision machining, heat treatment, and equipment manufacturing, NSPM offers integrated solutions that enhance accuracy, efficiency, and overall tooling performance.
