440A/440B/440C Stainless Steel Bar

Product Overview

440A, 440B, and 440C stainless steel bars are high-carbon martensitic stainless steels, known for their superior hardness, wear resistance, and high strength. 🔨 440A and 440B are typically used for applications requiring high strength and wear resistance, while 440C offers the highest hardness of the three, making it ideal for cutting tools, bearings, and dies. These materials are heat-treatable to achieve desired hardness levels, and are commonly used in industries such as manufacturing, automotive, and aerospace.Available Sizes

• 📏 Type: Round bar, Square bar, Flat bar, Hexagonal bar
• 📐 Diameter (Round): 6mm – 200mm
• 📏 Length: 1000mm – 6000mm or customized
• 🎯 Tolerances: h9, h10, h11 (available upon request)
• 📚 Standards: ASTM A276, ASTM A479, EN 10088-3

Chemical Composition

Element	440A (%)	440B (%)	440C (%)
C	≤ 0.60	≤ 0.75	≤ 0.95
Si	≤ 1.00	≤ 1.00	≤ 1.00
Mn	≤ 1.00	≤ 1.00	≤ 1.00
P	≤ 0.040	≤ 0.040	≤ 0.040
S	≤ 0.030	≤ 0.030	≤ 0.030
Cr	16.0 – 18.0	16.0 – 18.0	16.0 – 18.0
Ni	≤ 0.75	≤ 0.75	≤ 0.75

Mechanical Properties

Property	440A	440B	440C
Tensile Strength (MPa)	≥ 600	≥ 620	≥ 650
Yield Strength (MPa)	≥ 250	≥ 300	≥ 400
Elongation (%)	≥ 20%	≥ 15%	≥ 12%
Hardness (HB)	≤ 300	≤ 300	≤ 400

Features & Advantages

• ✅ High hardness and wear resistance
• 🔥 Heat treatable for precision tooling applications
• ⚙️ Suitable for cutting tools, knives, and dies
• 🛠️ Ideal for high-performance applications in demanding environments
• 🌟 Offers excellent mechanical properties and corrosion resistance

Applications

Surface Finish

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

Processing Services

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