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

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

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MOQ : 100 Kilograms

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

Temper
BA (Bright Annealed), 2B (Skin Passed), As Rolled (Hard), Q&T (Quenched & Tempered)

Chemical Composition
Refer to the image

Width
3.0 to 300 Millimeter (mm)

Grade
SUS420J2

Thickness
0.030 to 2.5 Millimeter (mm)

Surface
Bright, Dull

Application
Puncture Needles (Lancets), Medical Knives, Hairdressing Knives, Hinges, Thomson Blades, Pinnacle Blades, Doctor Blades, Scales, Reeds, Spinning Machine Components, Soldering Irons, Scrapers, Springs

Shape
Coil, Sheet

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

Minimum Order Quantity
100 Kilograms

Payment Terms
Telegraphic Transfer (T/T)

Packaging Details
Our Standard Packing for Export

Main Export Market(s)
Asia, North America, South America, Eastern Europe, Western Europe, Middle East

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

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)
Shape	Coil, Sheet
Thickness	0.030-2.5(Strip, Sheet) Millimeter (mm)
Width	3.0-300(Strip, Sheet) Millimeter (mm)
Length	Strip or Sheet(Length less than 2,000mm)
Technique	Cold Rolled
Temper	BA(Bright Annealed), 2B(Skin passed), As Rolled(Hard), Q&T
Surface	Bright, Dull
Application	Puncture Needles (lancets), Medical knives / Hairdressing knives, Hinges, Thomson Blades/Pinnacle Blades, Doctor Blades, Scale, reed, Spinning Machine, Soldering Irons, Scrapers, Springs
Coil I.D.	300, 400, 513mm
Chemical Composition	Refer to the image
Mechanical Properties	Refer to the image
Density	7.75 g/cm
Specific Heat	460 J/(kgK)
Electrical Resistivity	55 cm
Young's Modulus	200 GPa
Thermal Expansion	10.310^-6/K0100
Thermal Conductivity	24.7 W/(mK)
Melting Range	1454-1510
Magnetism	Strong
Minimum Order Quantity	100 Kilograms
Country of Origin	Japan, China
Payment Terms	Telegraphic Transfer (T/T)
Delivery Terms	EXW, FOB, CIF, DAP etc.
Packaging Details	Our Standard Packing for Export
Main Export Market(s)	Asia, Muddle East, North America, South America, Europe etc.

SUS420J2 is classified as a martensitic stainless steel, and although it is a stainless steel, can be hardened through quenching and tempering heat treatment. Because of its marketability, price, and usability, it is widely used in various fields.

Our annealed finish makes the carbides completely spheroidized, making processing easier and has excellent hardenability.

Main features of SUS420J2:

Suitable for Wear and Heat Resistant Applications.: This grade is best suited for wear-resistant stainless steel applications, and can be used for heat-resistant applications due to its high tempering resistance.

Less Mechanical and Physical Anisotropy: Due to the effect of microstructural transformation, it has less mechanical and physical anisotropy than austenitic spring materials that are hardened by cold rolling.

It allows for savings in thickness and width.: Due to being a martensitic stainless steel, it has a higher Young's modulus compared to non-ferrous or austenitic stainless steels for springs. This allows the thickness and width of leaf springs to be reduced.

TOKKIN supplies a variety of stainless steels for springs as specified in JIS G4313.

SUS420J2 - UNS S42000 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.

High-Performance Stainless Steel for Precision Tools

SUS420J2 is engineered to deliver outstanding hardness, corrosion resistance, and edge retention, making it ideal for complex applications like puncture needles, medical and industrial blades, and precision springs. Its adaptability in both form and function supports manufacturers demanding reliability in critical environments.

Variety of Tempers and Finishes

Supplied as BA (Bright Annealed), 2B (Skin Passed), Hard (As Rolled), or Q&T (Quenched & Tempered), SUS420J2 can be tailored to suit specific processing demands. The availability of bright and dull surfaces enhances both performance and visual appeal, catering to multiple industry requirements.

Broad Application Range and Tailored Dimensions

With width options from 3.0 to 300 mm and thicknesses as low as 0.030 mm, SUS420J2 adapts seamlessly for use in medical, industrial, textile, and consumer applications. Its robust characteristics allow for precision engineering, from intricate needles to durable blades used in hairdressing and manufacturing equipment.

FAQ's of SUS420J2 - UNS S42000 | Stainless Steel for Springs, Knives and Blades:

Q: How is SUS420J2 stainless steel processed for different applications?

A: SUS420J2 can be supplied in various tempers such as Bright Annealed, Skin Passed, Hard (As Rolled), and Quenched & Tempered. This range of processing ensures it meets the exact hardness and flexibility needed for applications like springs, knives, and medical instruments.

Q: What benefits does SUS420J2 offer for blade and spring manufacturing?

A: SUS420J2 offers excellent hardness, edge retention, and corrosion resistance. Its adaptability in temper and finish allows manufacturers to choose the best combination for long-lasting and reliable performance in demanding environments.

Q: When should I use SUS420J2 over other stainless steel grades?

A: Choose SUS420J2 if you require high hardness, wear resistance, and moderate corrosion protection-especially vital when producing components such as puncture needles, doctor blades, and industrial springs that demand both strength and precision.

Q: Where is SUS420J2 commonly sourced from?

A: SUS420J2 is extensively exported, manufactured, and supplied by specialized companies in Japan, known for strict quality standards and consistency in stainless steel production.

Q: What are the major industrial uses of SUS420J2?

A: Industries use SUS420J2 for medical knives, hairdressing scissors, hinges, machine components, soldering irons, scales, spinning machines, and specialty springs-owing to its versatile mechanical properties and surface finishes.

Q: How do the available dimensions of SUS420J2 meet diverse manufacturing needs?

A: With widths from 3.0 to 300 mm and thicknesses as low as 0.030 mm up to 2.5 mm, SUS420J2 can be precisely tailored, making it suitable for everything from fine puncture needles to large-scale industrial blades and springs.

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