SS 440B Round Bars

SS 440B Round Bars are high-performance stainless steel products engineered from a martensitic stainless steel grade known for its elevated hardness, excellent wear resistance, and moderate corrosion protection. SS 440B contains a higher carbon content (approximately 0.75%–0.95%) than standard stainless grades, which allows it to achieve superior hardness after heat treatment—making it particularly suitable for applications requiring precision, durability, and edge retention. It also includes approximately 16–18% chromium, contributing to its corrosion resistance in mildly aggressive environments.

The material’s metallurgical structure is primarily martensitic, offering high strength and the ability to be hardened through quenching and tempering processes. This results in a hardness range of 55–58 HRC, depending on the treatment parameters. SS 440B Round Bars and Rods are typically manufactured using precision hot rolling or cold drawing methods, followed by appropriate heat treatment cycles to enhance their mechanical properties. These bars exhibit tight dimensional tolerances, excellent straightness, and are available in various finishes such as black, bright, polished, and centerless ground, depending on their intended end use.

While SS 440B offers greater mechanical strength than SS 304 or SS 316, its corrosion resistance is more limited, making it ideal for dry or mildly corrosive environments rather than marine or highly acidic applications. Welding of SS 440B is generally not recommended due to its high carbon content, which can cause brittleness at the weld zone; however, with pre-heating and post-weld heat treatment, specialized welding can be performed. Machinability is considered moderate, and the alloy responds well to grinding and polishing, allowing for superior surface finishes in critical engineering components.

Applications

440B Stainless Steel Round Bars and Rods are specifically designed for components that require a combination of high surface hardness, wear resistance, and dimensional precision. This makes them an excellent choice for producing cutting tools, precision dies, high-strength fasteners, and components subjected to friction and abrasive conditions. Their ability to retain sharp edges and structural integrity even under mechanical load makes them widely used in the manufacture of knife blades, shear blades, molds, and punches.

In the mechanical and tooling sectors, SS 440B is used to create pins, bushings, and shafts where tight tolerances and minimal deformation under stress are crucial. These rods are also employed in the automotive and aerospace industries for parts that endure repetitive mechanical contact, such as bearing races, actuator components, and valve seats. Their high hardness ensures long service life, especially in rotating or reciprocating parts that require resistance to galling, scoring, and surface fatigue.

Additionally, SS 440B is suitable for applications in the electronics, defense, and surgical equipment sectors where a durable, wear-resistant metal is required. While it is not typically used for load-bearing structures, it excels in wear-prone assemblies and instrumentation where surface stability and reliability are essential. The material is also chosen for specialized components in the textile and paper processing industries, where equipment is subject to continuous movement and high wear cycles.

Industry Use and Supply Reach

SS 440B Round Bars are widely utilized in industries where components must withstand intense mechanical stress and abrasive conditions over extended periods of operation. In the tool and die industry, these bars are used to manufacture molds, die inserts, and hardened punches that must maintain performance over thousands of production cycles. The automotive and transportation sectors benefit from SS 440B’s structural integrity in components such as shafts, gears, and braking systems, where dimensional stability and hardness are vital.

In the defense and aerospace sectors, these stainless steel rods are used for precision parts in equipment and assemblies that must operate under high stress and mechanical fatigue. The industrial machinery and manufacturing sector also utilizes SS 440B in conveyor parts, feed rollers, wear plates, and sealing surfaces, where surface degradation would otherwise result in costly downtime and part replacement. In chemical and processing plants, the rods serve as internal parts within pumps and valves in environments that are not overly corrosive but require excellent resistance to wear and erosion.

To support industrial growth and meet diverse application needs, we supply SS 440B Round Bars and Rods across key regions including India, the United Arab Emirates (UAE), the Kingdom of Saudi Arabia (KSA), Kuwait, Qatar, the Sultanate of Oman, Iran, and Iraq. Our product offerings are manufactured to conform with international quality benchmarks such as ASTM A276 and ASTM A484, ensuring consistency, reliability, and material traceability. We provide round bars in various diameters, lengths, and custom finishes to suit sector-specific demands, from precision tooling to high-performance mechanical assemblies. Our strategically located supply chain infrastructure enables timely delivery and technical support to clients across these industrial hubs, making us a trusted source for high-hardness stainless steel solutions.

Our SS 440B Round Bars are used in a wide range of applications and various industries. Below are a few of them:

Application Industries

Aerospace Industry

Food Processing Industry

Pulp & Paper Indusry

Energy Industry

Pharmaceuticals Industry

Power Plant Industry

Chemical Industry

Oil and Gas Industry