Martenistic Steel

Martensitic stainless steel features a body-centered tetragonal (BCT) crystal structure formed by rapid quenching from austenite, with 10.5-18% chromium, higher carbon (0.1-1.2%), and minimal nickel, enabling heat treatment hardening to high strength (up to 275 MPa annealed, 60 HRC tempered) and hardness while remaining magnetic. It provides moderate corrosion resistance in mild environments via a chromium oxide layer, good wear resistance, and high tensile strength, but lower ductility, toughness, and weldability than austenitic or ferritic grades, with tempering essential to balance brittleness post-hardening

Factory Generated Scrap

Sheet & plate factory rejections, prime offcuts ,Pre-cut sheets, standard half-size lots, Cuttings, punchings, small pieces.

Heavy Melting Scrap

Large thick cuttings, industrial heavy lots, Industrial scrap like burnt (e.g., oxidized cast iron from stoves/grates) or painted steel.

Turnings/Borings

Machining byproducts (e.g., from turning, milling, drilling) in forms like loose, bundled, or crushed chips, generated during production

SS 410

Features:

Martensitic stainless steel with 11.5-13.5% chromium for moderate corrosion resistance
Heat-treatable for high strength and hardness
Magnetic and widely used in industrial and automotive parts

Applications:
Cutlery: knives, kitchen utensils, Industrial equipment: pumps, valves, shafts, bearings, automotive parts, Marine hardware (less severe conditions),Medical instruments, Military components

Heat Treatment:
Annealing: Heat slowly to ~815–900°C, furnace cool Hardening: Heat at 925–1010°C, air cool or oil quench Tempering: Temper in range 150–760°C depending on desired hardness and mechanical properties

Stainless steel 410 is a martensitic stainless steel alloy containing 11.5% to 13.5% chromium, which provides moderate corrosion resistance and good heat resistance. It is known for its high strength and hardness achieved through heat treatment, making it ideal for applications requiring wear resistance and durability. This magnetic steel is widely used in cutlery, industrial components, automotive parts, and valves, offering a cost-effective solution with good thermal conductivity and oxidation resistance at elevated temperatures.

Chromium (Cr): 11.5% – 13.5%

Carbon (C): 0.15% – 0.20%

Manganese (Mn): 1.00%

Silicon (Si): Max 1.00%

Titanium (Ti): 0.30%-0.60%

Phosphorus (P): Max 0.04%

Sulfur (S): Max 0.03%

Iron (Fe): 87-89%

Cutlery Industry: Knives, kitchen utensils

Industrial Equipment: Pumps, valves, shafts, bearings

Automotive: Exhaust systems, engine components

Tools & Hardware: Hand tools, fasteners

Aerospace/Military: Aircraft parts, gas turbine blades,Certain armament components.

Medical: Surgical instruments and dental tools

SS 420

Features:

High hardness (~52 HRC), heat-treated
Moderate corrosion resistance, improved when polished
Mirror finish, magnetic
Heat treatable via annealing, hardening
Wear resistant, fair machinability
Limited weldability, less formable than austenitic

Applications:
Cutlery: blades, knives, scissors, Medical: scalpels, dental, surgical tools. Industrial: needle valves, shear blades, bushings, Hand tools: springs, screwdrivers, wire, Pump/valve parts: hard, corrosion resistant, Fasteners, pins: stress, mild corrosion, Auto/Aero: fasteners, minor parts.

Heat Treatment:
Annealing (840–900°C), Hardening (980–1035°C with oil quench), Tempering (150–370°C; avoid above 600°C).

Stainless steel 420 is a high-carbon martensitic stainless steel known for its excellent hardness, wear resistance, and moderate corrosion resistance, making it ideal for cutting tools, knives, surgical instruments, and pump parts. It contains 12-14% chromium and can be heat treated to achieve high strength and durability. Commonly used in applications such as shear blades, needle valves, hand tools, and fasteners, SS 420 offers good corrosion resistance in mild environments and can be polished to a mirror-like finish. However, it is not recommended for use in temperatures above 427°C due to loss of hardness and corrosion resistance. Its machinability is better in the annealed condition, and welding requires special care to avoid cracking. Overall, SS 420 strikes a balance between mechanical performance and moderate corrosion protection for various industrial and medical uses.

Chromium (Cr): 12.0 – 14.0%

Carbon (C): 0.15 – 0.40%

Manganese (Mn): ≤ 1.0%

Silicon (Si): ≤ 1.0%

Sulfur (S): ≤ 0.03%

Iron (Fe): 85-88%

Cutlery: Knives , scissors due to excellent hardness and edge retention

Surgical and dental instruments: Wear resistance and moderate corrosion resistance

Shear blades and hand tools: High strength and durabilit

Needle valves and pump parts: Mechanical robustness

Machine components: Gears, shafts, and fasteners

Industrial equipment: Mild corrosive environments

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