SUS420J2 - UNS S42000 | Stainless Steel for Springs, Knives and Blades

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MOQ : 100 Kilograms

About SUS420J2 - UNS S42000 | Stainless Steel for Springs, Knives and Blades

Property	Value
Grade	SUS420J2
Reference Standards (For Reference Only)	JIS SUS420J2 (G4313, G4305) UNS S42000 AISI 420 EN / ISO 1.4028 / 4028-420-00-I, X30Cr13 GB S42030, 30Cr13 IS X30Cr13 (420 S2)
Available Shapes	Coil, Sheet
Manufacturable Thickness Range (Strip, Sheet)	0.030–2.5 mm
Manufacturable Width Range (Strip, Sheet)	3.0–300 mm
Length	Strip or Sheet (Length less than 2,000 mm)
Technique	Cold Rolled
Temper	BA (Bright Annealed), 2B (Skin Passed), As Rolled (Hard), Q&T (Quenched & Tempered)
Surface Finish	Bright, Dull
Examples of Applications	Puncture Needles (Lancets), Medical Knives, Hairdressing Knives, Hinges, Thomson Blades, Pinnacle Blades, Doctor Blades, Scales, Reeds, Spinning Machine Components, Soldering Irons, Scrapers, Springs
Coil I.D.	300, 400, 513 mm
Chemical Composition	Refer to the image
Mechanical Properties	Refer to the image
Density	7.75 g/cm³
Specific Heat	460 J/(kg·K)
Electrical Resistivity	55 μΩ·cm
Young's Modulus	200 GPa
Thermal Expansion	10.3 × 10^-6/K (0–100°C)
Thermal Conductivity	24.7 W/(m·K)
Melting Range	1454–1510 °C
Magnetism	Strong Magnetic
Minimum Order Quantity	100 Kilograms
Country of Origin	Japan, China
Payment Terms	Telegraphic Transfer (T/T)
Delivery Terms	EXW, FOB, CIF, DAP, etc.
Packing	Our Standard Packing for Export
Export Markets	Asia, Middle East, North America, South America, Europe, etc.
Description	SUS420J2 is a martensitic stainless steel that combines corrosion resistance with the ability to be hardened through quenching and tempering (Q&T) heat treatment. Due to its excellent balance of performance, availability, and cost, it is widely used across medical, industrial, cutting, and spring applications. TOKKIN's annealed finish provides fully spheroidized carbides, improving machinability, formability, and hardenability before subsequent heat treatment. Main Features: Excellent Wear and Heat Resistance Ideal for wear-resistant applications such as blades, knives, scrapers, and precision cutting tools. Its high tempering resistance also makes it suitable for certain heat-resistant applications. Low Mechanical and Physical Anisotropy Due to martensitic transformation, SUS420J2 exhibits lower anisotropy compared with austenitic spring stainless steels strengthened by cold rolling. Higher Stiffness and Spring Efficiency With a Young's modulus of approximately 200 GPa, it offers greater stiffness than many non-ferrous alloys and austenitic stainless steels, allowing spring designs with reduced thickness and width. Heat-Treatable High Strength Mechanical properties can be significantly enhanced through quenching and tempering processes. Good Balance of Corrosion Resistance and Hardness Provides corrosion resistance typical of martensitic stainless steels while achieving high hardness after heat treatment. SUS420J2 is commonly selected for medical blades, lancets, cutting tools, industrial wear components, springs, precision instruments, and applications requiring both corrosion resistance and high hardness. TOKKIN supplies a variety of spring stainless steel materials in accordance with JIS G4313 and related international standards.