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440C Stainless Steel Bright Bar High Hardness, Mirror Finish, Ideal for Precision Parts
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xProductdetails
| Productennaam | 440C roestvrijstalen staaf | Diameter | 10 - 350mm |
|---|---|---|---|
| Lengte | 6m of het afsnijden van een lengte als verzoek | Oppervlak | Peperd of helder |
| Dienst | Snijden | Standaard | Astm din gb en |
| Andere producten | Ronde bar, vierkante bar, platte bar.etc | Techniek | Heet opgerold |
| Markeren | 440C stainless steel bright bar,high hardness stainless steel bar,mirror finish stainless steel bar |
||
Productomschrijving
440C Stainless Steel Bright Bar High Hardness, Mirror Finish, Ideal for Precision Parts
Products Specification
| Products Name | 440C Stainless Steel Round Bar |
| Grade |
303,303Cu,304,304L,309S,310S,310H,316L,316Ti,316H,317L,321,329,347,410,415,420, 430F,431,440A/B/C,2205,2507,904l,254SMO,253MA,CD4MCU,XM-19,17-4PH,15-5PH,17-7PH,660,C276,600,601,625,718,800,800H,825,926.etc |
| Products Diameter Range | φ3mm - φ350mm |
| Length | 6m/pcs or cutting any length as request |
| Surface | Pickling finishing, bright finishing |
| Standard | ASTM JIS,GB,DIN EN |
| Service | Cutting |
| Other Shape | Square , Flat, Hexagonal, Round.etc |
| Loading Port | Shanghai Port |
| MOQ | 50 kgs |
440C Stainless Steel Bright Bar High Hardness, Mirror Finish, Ideal for Precision Parts
Introduction
440C stainless steel bright bar is a premium martensitic stainless steel product renowned for its exceptional hardness, mirror-like surface finish, and superior dimensional stability. As a high-carbon chromium alloy, it stands out as one of the hardest stainless steel grades available, making it the preferred choice for precision components requiring wear resistance, corrosion resistance, and long-term reliability. Whether in medical instruments, aerospace bearings, or high-performance cutting tools, 440C bright bar delivers consistent performance in the most demanding applications. This comprehensive guide covers all critical aspects of the product, including chemical composition, mechanical properties, standards, key features, applications, equivalent grades, packaging, and frequently asked questions.
Chemical Composition
The outstanding properties of 440C stainless steel bright bar are directly attributed to its carefully balanced chemical composition. High carbon content enhances hardness and wear resistance, while chromium forms a protective oxide layer for corrosion resistance. Molybdenum further boosts hardness and wear performance, ensuring the material maintains integrity under extreme conditions.
|
Element
|
Content Range (%)
|
Function
|
|
Carbon (C)
|
0.95 - 1.20
|
Enhances hardness, strength, and wear resistance; enables martensitic transformation during heat treatment
|
|
Chromium (Cr)
|
16.00 - 18.00
|
Forms a passive oxide layer for corrosion resistance; improves hardness and wear properties
|
|
Silicon (Si)
|
≤ 1.00
|
Enhances oxidation resistance and mechanical strength
|
|
Manganese (Mn)
|
≤ 1.00
|
Improves tensile strength and toughness without compromising corrosion resistance
|
|
Molybdenum (Mo)
|
0.75
|
Enhances hardness, wear resistance, and high-temperature stability
|
|
Phosphorus (P)
|
≤ 0.035
|
Controlled at low levels to avoid brittleness
|
|
Sulfur (S)
|
≤ 0.030
|
Minimized to ensure structural integrity and corrosion resistance
|
|
Nickel (Ni)
|
≤ 0.60
|
Allowed in small amounts to improve toughness
|
|
Iron (Fe)
|
Balance
|
Base metal providing structural support
|
Mechanical Properties
440C stainless steel bright bar exhibits exceptional mechanical performance, especially after heat treatment. Its high hardness (up to 60 HRC) and tensile strength make it suitable for load-bearing precision parts, while its moderate elongation ensures ductility for machining and forming.
|
Property
|
Annealed Condition
|
Quenched & Tempered Condition
|
Test Standard
|
|
Hardness
|
≤ 269 HB
|
58 - 60 HRC
|
ASTM E18, ASTM E10
|
|
Tensile Strength
|
≥ 560 MPa
|
≥ 1400 MPa
|
ASTM A370
|
|
Yield Strength (σ₀.₂)
|
≥ 205 MPa
|
≥ 1200 MPa
|
ASTM A370
|
|
Elongation (δ₅)
|
≥ 18%
|
≥ 5%
|
ASTM A370
|
|
Modulus of Elasticity
|
29.0 × 10³ ksi
|
29.0 × 10³ ksi
|
ASTM E111
|
|
Internal Stress
|
≤ 250 N/mm²
|
—
|
—
|
Note: Mechanical properties are optimized through heat treatment processes: annealing at 800 - 920°C (slow cooling), quenching at 1010 - 1070°C (oil cooling), and tempering at 100 - 180°C (fast cooling).
Standards
440C stainless steel bright bar complies with international standards to ensure consistency, quality, and compatibility across industries. Key standards include:
- ASTM A276: Specification for stainless steel bars, shapes, and forgings (primary standard for 440C bars)
- AISI 440C: American Iron and Steel Institute classification for high-carbon martensitic stainless steel
- UNS S44004: Unified Numbering System designation for 440C stainless steel
- DIN 1.4125: German standard equivalent for 440C
- JIS SUS 440C: Japanese Industrial Standard for 440C stainless steel
- GB 11Cr17: Chinese national standard equivalent
- EN 10088-3: European standard for stainless steel bars and sections
Key Features
1. Exceptional Hardness & Wear Resistance
After heat treatment, 440C bright bar achieves hardness levels of 58 - 60 HRC, ranking among the hardest stainless steel grades. Its high carbon and chromium content ensures superior wear resistance, making it ideal for parts subjected to friction and abrasion.
2. Mirror-Like Surface Finish
The bright bar undergoes precision polishing and grinding processes, resulting in a smooth, mirror-like surface (Ra ≤ 0.2 μm). This finish reduces friction, prevents contamination, and enhances corrosion resistance by eliminating surface defects.
3. Good Corrosion Resistance
While not as corrosion-resistant as austenitic grades (e.g., 304, 316), 440C offers reliable performance in mild corrosive environments such as air, fresh water, and neutral solutions. The chromium oxide layer provides protection against rust and oxidation, with optimal resistance achieved through proper heat treatment and surface cleaning.
4. High Dimensional Stability
440C maintains excellent dimensional accuracy even after heat treatment and prolonged use at high temperatures (up to 600°C). This stability is critical for precision parts requiring tight tolerances (± 0.5 mm for diameters 4 - 400 mm).
5. Machinability in Annealed State
In the annealed condition (hardness ≤ 269 HB), 440C bright bar can be easily machined using standard tools. Recommended cutting speeds range from 30 - 50 m/min, with progressive 打磨工艺 ensuring surface quality.
6. Versatile Heat Treatment
The material responds well to annealing, quenching, and tempering, allowing customization of hardness and toughness to meet specific application requirements. For example, lower tempering temperatures (100 - 180°C) maximize hardness, while higher temperatures (up to 427°C) improve toughness.
Applications
440C stainless steel bright bar is widely used in industries requiring precision, durability, and corrosion resistance. Key applications include:
1. Precision Bearings & Bushings
Ideal for rolling element bearings, races, and bushings in corrosive or high-temperature environments. Its high hardness and wear resistance ensure long service life in automotive, aerospace, and industrial machinery.
2. Medical Instruments
Used in surgical knives, scissors, orthopedic tools, and dental instruments. The mirror finish prevents bacterial adhesion, while the high hardness maintains sharpness and sterilizability.
3. Cutting Tools & Blades
Commonly used for high-quality knife blades, razor blades, chisels, and industrial cutters. It holds a sharp edge and resists dulling, outperforming many carbon steels in durability.
4. Aerospace Components
Employed in aircraft wing wave generators, valve cores, and other precision parts. Its ultra-high purity (oxygen content < 8 ppm) and strength meet the strict requirements of aerospace applications.
5. Mold & Die Making
Suitable for plastic and rubber molds requiring wear resistance and non-stick properties. The material withstands repetitive use while maintaining shape and surface quality.
6. Automotive Parts
Used in brake components,and valve parts. Its high strength and wear resistance improve performance and reliability in harsh operating conditions.
7. Measuring Instruments
Precision gauges, calipers, and other measuring tools benefit from 440C’s dimensional stability and wear resistance, ensuring accurate readings over time.
8. Marine & Defense Equipment
Applied in shipbuilding and defense for components requiring corrosion resistance and strength, such as valve stems and mechanical parts.
Equivalent Grades
440C stainless steel has international equivalents recognized by major standards organizations. This ensures compatibility and interchangeability across global supply chains:
|
Standard
|
Equivalent Grade
|
|
ASTM/AISI
|
440C (UNS S44004)
|
|
DIN
|
1.4125
|
|
JIS
|
SUS 440C
|
|
GB (China)
|
11Cr17, 9Cr18Mo
|
|
EN
|
X90CrMoV18
|
|
ISO
|
1.4125
|
Related Grades: 440A (lower carbon, higher corrosion resistance), 440B (medium carbon), 440F (free-machining grade with higher sulfur content).
Packaging & Transportation
To ensure product integrity during storage and transportation, 440C stainless steel bright bar is packaged using industry-standard methods:
Packaging Details
- Inner Layer: Waterproof kraft paper or plastic film to prevent moisture and corrosion.
- Outer Layer: Steel strips or iron sheets for mechanical protection.
- Pallets: Fumigated wooden pallets (compliant with ISPM 15) for stability during shipping. Each pallet weighs 1 - 3 tons, with bars secured by steel straps.
- Customization: Special packaging (e.g., vacuum sealing, anti-rust oil coating) available upon request for long-distance shipping or harsh environments.
Transportation
- Delivery Terms: EXW, FOB, CIF, CFR, DAP.
- Carriers: Sea freight (primary for bulk orders), air freight (for urgent or small quantities), and land transportation (domestic deliveries).
- Delivery Time: 7 - 45 days after order confirmation, depending on order quantity and customization requirements.
- Documentation: Includes commercial invoice, packing list, certificate of origin, material test report (MTR), and ISO/CE certification.
FAQ (Frequently Asked Questions)
Q1: What is the maximum hardness of 440C stainless steel bright bar?
A1: After optimal heat treatment (quenching at 1010 - 1070°C and tempering at 100 - 180°C), the hardness can reach 58 - 60 HRC, making it one of the hardest stainless steel grades available.
Q2: Is 440C suitable for marine environments?
A2: 440C offers moderate corrosion resistance and is suitable for mild marine environments (e.g., coastal air). However, it is not recommended for prolonged immersion in saltwater; for such applications, consider austenitic grades like 316 or duplex stainless steel.
Q3: Can 440C be welded?
A3: Welding 440C is challenging due to its high carbon content, which increases the risk of cracking. Preheating (649 - 816°C) and post-weld heat treatment are required to minimize brittleness. For critical applications, welding is generally not recommended; mechanical fastening is preferred.
Q4: What is the difference between 440C and 440F?
A4: 440F is a free-machining variant of 440C with higher sulfur content (≥ 0.15%). It offers improved machinability for automatic lathe processing but has slightly lower corrosion resistance and hardness compared to 440C.
Q5: What tolerances are available for 440C bright bar?
A5: Standard tolerances are ± 0.5 mm for diameters 4 - 400 mm, ± 1.0 mm for 400 - 500 mm, and ± 2.0 mm for larger sizes. Custom tolerances can be provided upon request to meet specific precision requirements.
Q6: How should 440C bright bar be stored?
A6: Store in a dry, well-ventilated area away from moisture and corrosive substances. Keep the original packaging intact until use, and avoid stacking heavy objects on the bars to prevent deformation. For long-term storage, apply anti-rust oil or vacuum seal the product.
Q7: What certifications are available for 440C bright bar?
A7: Our products comply with ISO 9001, ASTM, AISI, DIN, and JIS standards. Material test reports (MTRs) are provided with each shipment, including chemical composition, mechanical properties, and heat treatment records. Additional certifications (e.g., CE, FDA for medical applications) can be arranged upon request.
Q8: Can 440C be used at high temperatures?
A8: Yes, 440C maintains good hardness and stability at temperatures up to 600°C. It is suitable for high-temperature applications such as corrosion-resistant bearings and industrial furnaces. For temperatures above 600°C, consider heat-resistant alloys like Inconel.
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