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440C Stainless Steel Bright Bar for Industrial Use Hardened & Tempered, Superior Strength
| Luogo di origine | Cina |
|---|---|
| Marca | Delta |
| Certificazione | ISO 9001 |
| Numero di modello | 440c |
| Quantità di ordine minimo | 500 kg |
| Prezzo | 4.5 - 5.5 USD/Kg |
| Imballaggi particolari | scatola di legno o rivestimento in carta impermeabile |
| Tempi di consegna | 5 - 10 giorni |
| Termini di pagamento | T/T, Western Union |
| Capacità di alimentazione | 50 tonnellate al mese |
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xDettagli
| Nome dei prodotti | Barra in acciaio inossidabile 440C | Diametro | 10 - 350mm |
|---|---|---|---|
| Lunghezza | 6m o tagliare qualsiasi lunghezza come richiesta | Superficie | Sottaceti o brillanti |
| Servizio | Taglio | Standard | ASTM Din GB en |
| Altri prodotti | barra rotonda, barra quadrata, barra piatta.etc | Tecnica | Laminato caldo |
| Evidenziare | 440C stainless steel bright bar,hardened tempered steel bar,industrial stainless steel bar |
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Descrizione di prodotto
440C Stainless Steel Bright Bar for Industrial Use Hardened & Tempered, Superior Strength
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 |
chromium content, which enables it to achieve the highest hardness among all stainless steel grades when subjected to professional hardening and tempering processes . Designed specifically for industrial environments where durability and precision are non-negotiable, 440C bright bar delivers superior mechanical properties that outperform conventional stainless steels like 304 and 316 in high-stress, wear-intensive scenarios . This comprehensive guide explores the composition, properties, applications, and technical advantages of 440C stainless steel bright bar, helping industrial buyers and engineers make informed material selections.
Overview of 440C Stainless Steel Bright Bar
440C stainless steel bright bar is a cold-finished product characterized by its smooth, polished surface (typically No. 4 or BA finish) and consistent dimensional accuracy, making it ideal for precision machining and assembly . As a high-carbon martensitic alloy, its chemical composition is optimized to balance hardness, strength, and corrosion resistance: carbon (0.95-1.20%) enhances hardenability and wear resistance, while chromium (16.0-18.0%) forms a protective oxide layer that guards against rust and oxidation . Unlike austenitic stainless steels (e.g., 304, 316), 440C is magnetic and achieves its peak performance through a controlled hardening and tempering process, reaching a Rockwell C hardness of 58-60 HRC—far exceeding the hardness of standard stainless steel grades . This unique combination of properties makes it a preferred material for components that must withstand heavy loads, repeated friction, and harsh operating conditions.
Chemical Composition of 440C Stainless Steel Bright Bar
The precise chemical composition of 440C stainless steel bright bar adheres to international standards such as ASTM A276-03, JIS G 4303:1998, and DIN EN 10088-3, ensuring consistency and reliability across batches . The table below details the key elemental composition:
| Element | Content Range (%) | Function |
|---|---|---|
| Carbon (C) | 0.95 - 1.20 | Primary hardening agent; enhances wear resistance and tensile strength |
| Chromium (Cr) | 16.0 - 18.0 | Forms corrosion-resistant oxide layer; improves hardenability |
| Manganese (Mn) | ≤ 1.00 | Improves machinability and hot workability |
| Silicon (Si) | ≤ 1.00 | Enhances strength and heat resistance |
| Phosphorus (P) | ≤ 0.04 | Controlled impurity; minimizes brittleness |
| Sulfur (S) | ≤ 0.03 | Controlled impurity; improves machinability in annealed state |
| Iron (Fe) | Balance | Base metal; provides structural integrity |
Trace elements such as molybdenum (Mo) or nickel (Ni) may be added in some formulations to further enhance corrosion resistance or toughness, though they are not required by standard specifications .
Mechanical & Physical Properties (Hardened & Tempered)
The hardening and tempering process is critical to unlocking the full potential of 440C stainless steel bright bar. Typically, the bar is quenched in oil at 1050°C to form a martensitic structure, followed by tempering at 150-200°C to reduce brittleness while retaining high hardness . For applications requiring maximum hardness, a cold treatment at -75°C for 1 hour can increase hardness to 61.5 HRC . The table below outlines the key mechanical and physical properties in the hardened & tempered (H&T) condition:
Mechanical Properties (H&T Condition)
| Property | Value | Standard Reference |
|---|---|---|
| Tensile Strength | ≥ 560 MPa | ASTM A276-03 |
| Yield Strength (σ₀.₂) | ≥ 205 MPa | ASTM A276-03 |
| Hardness (Rockwell C) | 58 - 60 HRC | JIS G 4303:1998 |
| Elongation (d5) | ≥ 18% | ASTM A276-03 |
| Brinell Hardness (HB) | ≤ 250 (Annealed) | ASTM A276-03 |
Physical Properties
| Property | Value | Test Condition |
|---|---|---|
| Density | 7.75 g/cm³ | 20°C |
| Thermal Conductivity | 29.3 W/(m·K) | 20°C |
| Coefficient of Linear Expansion | 10.5 μm/m·K | 20-200°C |
| 11.7 μm/m·K | 20-500°C | |
| Critical Temperatures (Ac1) | 815-865°C | Austenite formation start |
| Critical Temperatures (Ms) | 145°C | Martensite formation start |
| Magnetic Properties | Magnetic | H&T Condition |
These properties make 440C bright bar significantly stronger and more wear-resistant than 304 stainless steel (which has a tensile strength of ~515 MPa and hardness of ≤ 201 HB) and 316 stainless steel (tensile strength ~515 MPa, hardness ≤ 201 HB) . The superior hardness ensures excellent edge retention for cutting tools and minimal wear for bearing components, even under continuous operation .
Heat Treatment Process for 440C Bright Bar
To achieve the "hardened & tempered" condition, 440C stainless steel bright bar undergoes a precise two-step heat treatment process:
- Quenching: The bar is heated to 1050-1100°C and held for 30-60 minutes to ensure uniform austenitization, then quenched rapidly in oil or air to form a hard, brittle martensitic structure . This step is critical for maximizing hardness, reaching up to 60 HRC .
- Tempering: The quenched bar is reheated to 150-200°C and held for 1-2 hours, then cooled to room temperature. Tempering relieves internal stresses and improves toughness while maintaining high hardness—150°C tempering results in 61 HRC, while 200°C tempering yields 59 HRC . For applications requiring enhanced dimensional stability, a cryogenic treatment (-75°C for 1 hour) can be added after quenching to convert retained austenite to martensite, increasing hardness to 61.5 HRC .
It is important to note that 440C has limited weldability due to its high carbon content; welding requires preheating (200-300°C) and post-weld annealing to prevent cracking . Machinability is excellent in the annealed state (≤ 269 HB) but requires carbide or ceramic tools in the hardened condition due to its high hardness .
Industrial Applications of 440C Stainless Steel Bright Bar
The unique combination of superior strength, wear resistance, and moderate corrosion resistance makes 440C bright bar suitable for a wide range of industrial applications across sectors:
1. Bearing & Valve Components
440C is widely used for ball bearings, roller bearings, and valve parts (e.g., stems, seats, nozzles) due to its high hardness, wear resistance, and ability to withstand heavy loads . In marine and industrial pump systems, it resists corrosion from fresh water and mild chemicals while enduring continuous friction .
2. Cutting Tools & Blades
High-end industrial knives, scissors, and surgical/dental instruments rely on 440C for its exceptional edge retention and corrosion resistance . Surgical tools benefit from its ability to withstand repeated sterilization without degrading, while industrial blades maintain sharpness even when cutting abrasive materials .
3. Mold & Die Manufacturing
Plastic injection molds and extrusion dies use 440C bright bar for its hardness, wear resistance, and dimensional stability . The smooth bright surface reduces friction with molten plastic, ensuring high-quality part finishes and extending mold life .
4. Mechanical & Automotive Components
Shafts, gears, and fasteners in heavy machinery and automotive applications utilize 440C for its tensile strength and fatigue resistance . It is particularly suitable for components in high-temperature environments (up to 300°C) where standard stainless steels may soften .
5. Marine & Defense Applications
In marine atmospheres and coastal industrial settings, 440C resists corrosion from salt spray and humidity better than carbon steel and some low-chromium stainless steels . It is used in shipbuilding (e.g., propeller shafts, valve stems) and defense equipment requiring durability in harsh conditions .
Product Specifications & Customization Options
440C stainless steel bright bar is available in a range of sizes and configurations to meet diverse industrial needs, with compliance to international standards (ASTM, AISI, JIS, GB, DIN) . The table below lists standard specifications:
| Product Type | Dimensions | Surface Finish | Length | Tolerance |
|---|---|---|---|---|
| Round Bar | 4 mm - 500 mm (OD) | Bright Polished (No. 4), BA, Matt | 1-6 meters (customizable) | ±0.05 mm |
| Hexagon Bar | 18 mm - 57 mm (11/16″ to 2-3/4″) | Bright Polished | 1-6 meters (customizable) | ±0.10 mm |
| Square Bar | 18 mm - 47 mm (11/16″ to 1-3/4″) | Bright Polished | 1-6 meters (customizable) | ±0.10 mm |
| Flat Bar | 2 mm - 150 mm (thickness); 12.7 mm - 254 mm (width) | Bright Polished | 1-6 meters (customizable) | ±0.08 mm |
Customization options include:
- Non-standard diameters/lengths (up to 12 meters)
- Special surface finishes (8K mirror polish, HL hairline)
- Precision machining (threading, grooving, grinding)
- Certifications (ISO, SGS, BV) for quality assurance
440C vs. Common Stainless Steel Grades: Key Advantages
When compared to widely used grades like 304 and 316, 440C stainless steel bright bar offers distinct advantages for industrial applications requiring superior strength and wear resistance:
| Property | 440C Stainless Steel | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|---|
| Hardness (HRC) | 58-60 (H&T) | ≤ 22 | ≤ 22 |
| Tensile Strength | ≥ 560 MPa | ~515 MPa | ~515 MPa |
| Wear Resistance | Excellent | Moderate | Moderate |
| Corrosion Resistance | Good (dry/mild environments) | Excellent (general use) | Superior (corrosive environments) |
| Machinability (H&T) | Moderate (requires carbide tools) | Excellent | Good |
| Cost | Higher | Lower | Higher than 304, lower than 440C |
| Ideal Applications | Bearings, blades, molds | Food processing, construction | Chemical processing, marine (high chloride) |
While 304 and 316 excel in corrosion resistance for general and chemical applications, 440C is unmatched in hardness and wear resistance, making it the preferred choice for high-stress, precision industrial components .
Quality Assurance & Compliance
Our 440C stainless steel bright bar is manufactured in ISO 9001-certified facilities, with strict quality control throughout the production process—from raw material selection to final inspection . Each batch undergoes:
- Chemical composition analysis (spectrometry)
- Mechanical property testing (tensile, hardness, elongation)
- Dimensional accuracy checks (laser measurement)
- Surface finish inspection (visual and roughness testing)
- Corrosion resistance testing (salt spray, immersion)
Compliance with international standards (ASTM A276, JIS G 4303, DIN EN 10088-3) ensures compatibility with global industrial requirements, while SGS/BV third-party certifications provide additional quality assurance .
Conclusion
440C stainless steel bright bar—hardened and tempered for superior strength—stands as a premium material for industrial applications demanding exceptional hardness, wear resistance, and precision. Its unique chemical composition, optimized heat treatment, and versatile specifications make it indispensable in bearings, cutting tools, molds, and mechanical components across automotive, marine, defense, and manufacturing sectors. By outperforming conventional stainless steel grades in high-stress environments, 440C bright bar delivers long-term reliability, reduced maintenance costs, and enhanced performance for critical industrial systems. Whether you require standard sizes or custom-engineered solutions, our 440C stainless steel bright bar meets the most stringent quality standards, backed by comprehensive testing and compliance. Choose 440C for your next project to experience the difference in strength, durability, and precision.
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