410 Martensitic Hardenable Stainless Steel Sheet Plate 0.5mm-6mm Annealed Temper for Cutlery Blade Pump Shaft

Grade 410 stainless steel sheet is the foundational martensitic stainless steel, containing 11.5-13.5% chromium as its primary alloying element with controlled carbon content to enable hardening through conventional heat treatment processes. Unlike the austenitic 300 series which cannot be hardened by heat treatment, 410 undergoes a martensitic phase transformation when heated above its critical temperature (approximately 950-1050°C) and rapidly cooled, producing a hard, wear-resistant microstructure that can be tempered to achieve specific hardness and toughness combinations. In the annealed condition, 410 sheet is supplied soft and ductile with a ferritic microstructure containing spheroidized chromium carbides, providing excellent formability and machinability for blanking, stamping, deep drawing, and machining operations prior to final hardening. After fabrication, components are hardened by austenitizing at 950-1050°C followed by oil or air quenching to form martensite, then tempered at 200-700°C to achieve the desired balance of hardness, strength, and toughness. Typical attainable hardness ranges from 35 to 45 HRC for general-purpose applications, with lower tempering temperatures producing higher hardness at the expense of toughness. This heat-treatable characteristic makes 410 the preferred stainless steel grade for cutlery, surgical and dental instruments, valve components, pump shafts, steam turbine blades, fasteners, and petrochemical equipment requiring moderate corrosion resistance combined with wear and galling resistance.

Our 410 stainless steel sheet is manufactured to ASTM A240 and EN 10088-2 specifications, beginning with electric arc furnace melting of carefully selected ferrous scrap and ferroalloys. Following AOD refining to achieve precise control of the 11.5-13.5% chromium and 0.08-0.15% carbon content, the molten steel is continuously cast into slab feedstock. The cast slabs undergo a carefully controlled hot rolling sequence with finishing temperatures maintained above 850°C, followed by slow cooling or isothermal annealing to produce a soft ferritic structure suitable for subsequent cold rolling. Cold rolling is performed on Sendzimir mills capable of achieving tight gauge tolerances (typically ±0.03mm for sheet gauges below 3mm). The cold rolled strip undergoes final annealing at 750-820°C in a controlled atmosphere furnace followed by slow cooling to produce the fully annealed condition with maximum softness and formability. This annealing process is critical—rapid cooling from the annealing temperature would produce an undesirably hard martensitic structure, while excessive time at temperature would cause undesirable grain growth. The annealed sheet receives a final skin pass for surface finish and flatness control, and is supplied in the 2B finish with a smooth, non-reflective grey surface. Magnetic particle inspection capability is maintained for the detection of surface discontinuities when specified for critical rotating component applications.

• Heat Treatable Martensitic Grade: Unlike non-hardenable austenitic 300 series, 410 can be hardened through quench and temper heat treatment to achieve 35-45 HRC, providing wear resistance and edge retention essential for cutlery and tooling applications.
• Good Corrosion Resistance: 11.5-13.5% chromium content provides adequate resistance to atmospheric corrosion, fresh water, mild chemical environments, steam, and many organic compounds in the hardened and tempered condition.
• Excellent Formability in Annealed Condition: Supplied in the soft annealed state with typical hardness of 80-95 HRB, enabling blanking, stamping, deep drawing, bending, and cold heading operations before final hardening heat treatment.
• Magnetic Properties: Ferritic in the annealed condition and martensitic after hardening, 410 is strongly magnetic in all heat treatment conditions, making it suitable for solenoid components, magnetic actuators, and induction heating applications.
• Wide Tempering Range: Tempering temperatures from 200°C (high hardness, 45 HRC) to 700°C (good toughness, 25 HRC) provide flexibility to match mechanical properties to specific application requirements.
• Steam and Mild Acid Resistance: Performs well in steam service up to 540°C, dilute nitric acid, and many organic acids, making it suitable for steam turbine blading, valve trim, and chemical processing equipment.
• Good Machinability: In the annealed condition, 410 machines similarly to medium carbon steels, with chip-breaking characteristics superior to the gummy austenitic grades, enabling economical production of machined components.

The cutlery and kitchenware industry represents the largest consumer market for 410 stainless steel, where the alloy is used for knife blades, scissor components, kitchen shears, and food processor cutting discs that require the edge retention and wear resistance achievable through heat treatment. Surgical and dental instrument manufacturers utilize 410 for forceps, needle holders, scalpel handles, dental elevators, and orthodontic pliers, where the combination of corrosion resistance from steam autoclave sterilization and hardness for instrument function are essential. The pump and valve industry specifies 410 for pump shafts, wear rings, valve stems, seats, and trim components in water, steam, and mild chemical service, exploiting the alloy's galling resistance and ability to maintain a good surface finish under sliding contact conditions. Steam turbine manufacturers use 410 for low-pressure turbine blades, stationary vanes, and bolting materials where the high-temperature strength up to 540°C, combined with steam corrosion resistance, provides reliable long-term service in power generation plants. The petrochemical industry employs 410 for fractionator tower trays, heat exchanger baffles, and vessel internals in crude oil distillation units where corrosion from sulfur compounds is moderate and the magnetic property enables in-service inspection using magnetic flux leakage techniques. Additional applications include automotive exhaust flanges, motorcycle brake disc rotors, mining screen decks, fasteners including bolts, nuts, and washers for corrosion-resistant assemblies, and mold bases for plastic injection molding.

Quality assurance for 410 martensitic stainless steel sheet focuses on chemistry control for consistent heat treatment response and mechanical property verification in the annealed supply condition. Each production heat undergoes optical emission spectrometry analysis to verify the 11.5-13.5% chromium and 0.08-0.15% carbon content, with supplementary analysis for residual elements including phosphorus (0.04% max), sulfur (0.03% max), and tramp elements that could affect hardenability. Annealed mechanical properties are verified through tensile testing per ASTM A370 on samples from each production lot, with hardness testing per ASTM E18 as a process control check. The annealed grain structure is examined metallographically to ensure freedom from excessive grain growth, continuous carbide networks at grain boundaries, and delta ferrite stringers that could impair toughness after hardening. Hardenability response is confirmed through a Jominy end-quench test per ASTM A255 or equivalent, demonstrating consistent hardness profile across the section for the specified austenitizing temperature. Surface quality inspection utilizes automated stroboscopic vision systems to detect laps, seams, slivers, and scale inclusions. Flatness is verified using a precision surface plate and dial indicator per ASTM A480 flatness tolerances. Packaging consists of interleaving each sheet with VCI corrosion inhibiting paper, stacking on fumigated ISPM 15 compliant wooden pallets with protective edge boards, wrapping in heavy-gauge waterproof polyethylene, and securing with polyester strapping. Each shipment includes the EN 10204 3.1 mill test certificate with full chemical and mechanical test results, packing list, commercial invoice, and certificate of origin.