304F & 316F Stainless Steel Bar

1. Product Overview

304F and 316F stainless steel bars are free-cutting versions of the standard 304 and 316 austenitic stainless steels. 🔧 These grades have been specially modified by adding sulfur to improve machinability, making them ideal for high-speed CNC machining operations, such as turning, drilling, and tapping. While retaining the excellent corrosion resistance and strength of 304 and 316, the F grades are designed for applications requiring ease of machining and minimal tool wear, commonly used in the automotive, aerospace, and general manufacturing industries.

2. Available Sizes

• 📏 Type: Round bar, Square bar, Flat bar, Hexagonal bar
• 📐 Diameter (Round): 5mm – 200mm
• 📏 Length: 1000mm – 6000mm or customized
• 🎯 Tolerances: h9, h10, h11 (available upon request)
• 📚 Standards: ASTM A276, ASTM A479, EN 10088-3, JIS G4303

3. Chemical Composition

Element	304F (%)	316F (%)
C	≤ 0.08	≤ 0.08
Si	≤ 1.00	≤ 1.00
Mn	2.00 – 3.00	2.00 – 3.00
P	≤ 0.045	≤ 0.045
S	0.15 – 0.35	0.15 – 0.35
Cr	18.0 – 20.0	16.0 – 18.0
Ni	8.0 – 10.5	10.0 – 14.0
Mo	—	2.0 – 3.0

4. Mechanical Properties

Property	304F	316F
Tensile Strength (MPa)	≥ 515	≥ 515
Yield Strength (MPa)	≥ 205	≥ 205
Elongation (%)	≥ 40%	≥ 40%
Hardness (HB)	≤ 201	≤ 217

5. Features & Advantages

• ✅ Excellent machinability with reduced tool wear
• ⚙️ High-speed machining suitable for CNC and automatic lathes
• 🔥 Excellent corrosion resistance in both 304 and 316 grades
• 🛠️ Improved surface finish after machining due to sulfur addition
• 📦 Ideal for manufacturing precision components at high volumes

6. Applications

7. Surface Finish

• 🖤 Black
• 🧼 Pickled
• ✨ Bright
• 🔧 Polished (180#, 240#, 320#)
• 🌀 Peeled / Turned / Ground

8. Processing Services

• ✂️ Length cutting to customer specifications
• 🧽 Surface grinding and polishing
• 🔩 CNC machining and threading
• 📏 Precision tolerance control
• 📦 Custom packaging for bulk shipments