Diameter 3 - 150mm Alloy 321F Stainless Steel Bar Precision Grinding SS Bars With Small Tolerance
Products Specification
| Products Name | 321F Stainless Steel Round Bar |
| Grade | 303,304,304L,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 |
Diameter 3 - 150mm Alloy 321F Stainless Steel Bar Precision Grinding SS Bars With Small Tolerance
Introduction to Diameter 3 - 150mm Alloy 321F Stainless Steel Bar
Alloy 321F stainless steel bars, with diameters ranging from 3mm to 150mm, are renowned for their exceptional performance in high-temperature and corrosive environments. This particular grade of stainless steel, 321F, is a titanium-stabilized variant of the widely used Type 304 stainless steel, designed to offer improved resistance to intergranular corrosion, oxidation, and stress corrosion cracking.
These precision-ground stainless steel bars are processed to achieve very tight tolerances, making them ideal for high-precision applications across industries such as aerospace, chemical processing, power generation, and food processing. The fine surface finish and small tolerances make these bars an excellent choice for both structural and decorative purposes.
In this product overview, we will discuss the properties, applications, specifications, and advantages of Diameter 3 - 150mm Alloy 321F Stainless Steel Bars, with an emphasis on precision grinding and small tolerance grades.
Alloy 321F Stainless Steel Composition
The primary feature of 321F stainless steel is its titanium stabilization, which prevents the formation of chromium carbide at grain boundaries during welding and high-temperature exposure. This ensures the alloy remains resistant to intergranular corrosion, which is particularly useful in industries requiring high-temperature performance and weldability.
Typical Chemical Composition of Alloy 321F Stainless Steel:
| Element | Content |
| Chromium (Cr) | 17.0 - 19.0% |
| Nickel (Ni) | 9.0 - 12.0% |
| Titanium (Ti) | 5xC min. |
| Manganese (Mn) | 2.0% max. |
| Silicon (Si) | 1.0% max. |
| Carbon (C) | 0.08% max. |
| Phosphorus (P) | 0.045% max. |
| Sulfur (S) | 0.030% max. |
The titanium (Ti) content in Alloy 321F plays a crucial role in stabilizing the structure of the stainless steel and preventing the formation of harmful chromium carbides. This makes 321F an excellent choice for applications where welding and heat resistance are critical.
Key Properties of Diameter 3 - 150mm Alloy 321F Stainless Steel Bars
Mechanical Properties
The Alloy 321F stainless steel bars exhibit excellent mechanical properties, making them ideal for applications where strength and durability are crucial. Some of the key mechanical properties of 321F stainless steel bars include:
| Property | Value |
| Tensile Strength | 515 - 690 MPa (75,000 – 100,000 psi) |
| Yield Strength | 205 - 350 MPa (30,000 – 50,000 psi) |
| Elongation | 40% min (in 50 mm) |
| Hardness | Rockwell B (HRB) 90 max |
| Modulus of Elasticity | 200 GPa (29 x 10³ ksi) |
These values indicate that the 321F stainless steel bars have a strong ability to withstand mechanical stresses and deformation, making them suitable for high-performance engineering applications. The elongation and yield strength values suggest good flexibility without compromising strength.
Thermal and Corrosion Resistance
321F stainless steel bars are designed to withstand extreme temperatures and resist corrosion in harsh environments. Here are the key thermal and corrosion properties:
| Property | Value |
| Maximum Service Temperature | 870°C (1600°F) |
| Thermal Conductivity | 15.1 W/m·K at 100°C |
| Specific Heat Capacity | 500 J/kg·K at 25°C |
| Coefficient of Thermal Expansion | 17.3 µm/m·K at 20–100°C |
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Corrosion Resistance: 321F stainless steel provides superior resistance to oxidation and intergranular corrosion, even at elevated temperatures. This makes it ideal for high-temperature applications in the aerospace, power generation, and chemical processing industries.
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Oxidation Resistance: The material can withstand oxidation at temperatures up to 870°C (1600°F), making it suitable for use in exhaust systems, engine parts, and high-temperature pipelines.
Weldability
Due to its titanium stabilization, 321F stainless steel is highly weldable. It prevents carbide precipitation at grain boundaries, which can lead to sensitization (intergranular corrosion), ensuring the material retains its high-temperature and corrosion-resistant properties even after welding.
Precision Grinding and Small Tolerance Features
One of the standout features of these diameter 3 - 150mm stainless steel bars is their precision grinding. The bars undergo rigorous grinding processes to ensure that they meet tight tolerances, which are crucial in high-precision applications where slight variations can affect the final performance of the component.
Tolerances for Precision Grinding
| Tolerance Class | H6 | H7 | H8 | H9 |
| Tolerance | ±0.010 mm | ±0.020 mm | ±0.030 mm | ±0.050 mm |
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H6 Tolerance: This tolerance grade is suitable for high-precision applications, where exact measurements are critical.
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H7 Tolerance: Often used in mechanical components where a moderate level of precision is required.
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H8 and H9 Tolerances: These are more relaxed and can be used in general industrial applications where small dimensional variations will not affect the function.
The precision grinding process ensures that each bar is straight, with a consistent surface finish and smoothness, making it easy to machine or integrate into assemblies.
Applications of Diameter 3 - 150mm Alloy 321F Stainless Steel Bars
Alloy 321F stainless steel bars are suitable for a variety of applications that demand strength, durability, and corrosion resistance, particularly at elevated temperatures. Some of the most common industries and applications include:
Aerospace
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Engine components (e.g., turbine blades, exhaust systems)
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High-temperature structural components
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Aircraft frames and supports exposed to extreme conditions
Chemical and Petrochemical Processing
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Heat exchangers
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Tanks and vessels for corrosive liquids
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Piping systems for harsh environments
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Reactors and pressure vessels for high-temperature and corrosive environments
Power Generation
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Turbine parts and boilers for thermal plants
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Heat exchangers and cooling systems
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Exhaust systems and valves exposed to high-pressure and high-temperature fluids
Food and Pharmaceutical Processing
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Components in machinery where hygiene and corrosion resistance are essential
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Storage tanks, pipes, and heat exchangers exposed to cleaning chemicals and high temperatures
Advantages of Diameter 3 - 150mm Alloy 321F Stainless Steel Bars
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High-Temperature Resistance: The alloy's ability to perform in temperatures up to 870°C (1600°F) makes it suitable for extreme environments.
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Corrosion Resistance: Exceptional resistance to both intergranular corrosion and oxidation at high temperatures.
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Weldability: The titanium addition ensures superior weldability without compromising the material's properties.
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Precision Grinding: The bars are manufactured to meet tight tolerances (H6, H7, H8, H9), ensuring they meet the precise specifications required for demanding applications.
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Strength and Durability: High mechanical strength and toughness, ensuring long service life and minimal maintenance costs.
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Versatility: Ideal for a wide range of industries, including aerospace, chemical processing, food and pharmaceutical, and power generation.
Conclusion
The Diameter 3 - 150mm Alloy 321F Stainless Steel Bar with precision grinding and small tolerance is a highly versatile material for high-performance applications. With its superior corrosion resistance, excellent mechanical properties, and the ability to withstand extreme temperatures, it is the preferred choice in industries where reliability and durability are paramount.
Whether you're in the aerospace, petrochemical, or power generation sector, these stainless steel bars can meet your needs for precision and performance. Their small tolerance and bright, smooth finish make them ideal for a range of applications, from structural components to high-precision machinery.
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