Overview
Stainless Steel 19-2 is a martensitic grade stainless steel primarily composed of iron, chromium (12–14%), and carbon (0.15–0.40%). It is part of the AISI 420 series, valued for its balance of corrosion resistance, hardness, and cost-effectiveness. Unlike austenitic grades (e.g., 304), it is magnetic and can be heat-treated to enhance strength. Developed for applications requiring sharp edges and wear resistance, it is a staple in cutlery and precision tools. Its popularity in B2B markets stems from its versatility and ease of fabrication. Manufacturers favor it for projects demanding tight tolerances and moderate exposure to corrosive environments, such as food processing or medical devices.
Physical and Chemical Properties
Stainless Steel 19-2 exhibits a tensile strength of 850–1000 MPa after heat treatment, with a Rockwell hardness (HRC) of 50–55. Its chromium content forms a passive oxide layer, offering resistance to mild acids and organic chemicals, though it is less corrosion-resistant than higher-chromium alloys like 316. The steel’s machinability is rated at 65% (relative to 1212 carbon steel), making it suitable for CNC operations. Thermal conductivity is approximately 30 W/m·K, and electrical resistivity is 55 μΩ·cm. It retains mechanical properties up to 300°C but may lose toughness in sub-zero temperatures. Post-weld annealing is recommended to relieve stresses and restore corrosion resistance.
Main Applications
The primary use of Stainless Steel 19-2 is in cutlery, including knives, scissors, and razors, where edge retention is critical. Surgical instruments like scalpels and forceps also utilize this grade due to its sterilizability and biocompatibility. Industrial applications include pump shafts, valve components, and measuring tools. In consumer goods, it appears in high-end kitchenware and decorative hardware. Emerging uses include 3D-printed components for aerospace, where its machinability reduces post-processing costs. Niche markets include firearm components and textile cutting blades, leveraging its wear resistance.
Safety and Storage
While Stainless Steel 19-2 is generally safe in finished products, machining generates fine dust that can irritate respiratory systems. Workshops should use local exhaust ventilation and enforce PPE protocols, including N95 masks. Prolonged skin contact with oils or coolants used during processing may cause dermatitis. Storage requires protection from moisture to prevent surface staining. Stacking should avoid abrasive contact; polyethylene separators are ideal for sheets or coils. For long-term storage, vapor-corrosion inhibitors (VCIs) are recommended. Disposal follows standard metal recycling practices, with no special hazardous waste classification.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO 9001 certification and material test reports (MTRs) confirming composition and mechanical properties. Common forms include bars, sheets, and wires, with thickness tolerances of ±0.1 mm for precision applications. Bulk orders (1+ metric tons) typically attract 10–15% discounts. Lead times vary from 2–6 weeks, depending on mill schedules. Just-in-time procurement is feasible for standardized sizes. Key negotiation points include payment terms (e.g., 30% upfront) and Incoterms (FOB preferred for international shipments). Secondary processing (e.g., annealing, polishing) may be outsourced to the supplier for cost efficiency.
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