Stainless Steels
Martensitic
SUS420J2 | Martensitic Stainless Steel
Overview & Features
Our annealed finish makes the carbides completely spheroidized, making processing easier and has excellent hardenability.
Main features of SUS420J2:
(1) 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.
(2) 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.
(3) 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.
Please refer to this page for the features and comparison of each grade of stainless steel for springs.
Examples of Applications
Puncture Needles (lancets), Medical knives / Hairdressing knives, Hinges, Thomson Blades/Pinnacle Blades, Doctor Blades, Scale, reed, Spinning Machine, Soldering Irons, Scrapers, Springs
Supported Shapes
Supported Range (COIL,SHEET)
Thickness
0.030-2.5mm
Width
3.0-300mm
Length
COIL or SHEET less than 2000mm
This is the manufacturing range of coils and sheets we manufacture.
Standards
We manufacture in accordance with JIS G4313 standards.
Overseas standards are listed as equivalent or similar to our materials, so please use them as a reference.
JIS
SUS420J2 (G4313, G4305)
UNS
S42000
AISI
420
EN
1.4028
1.4034
ISO
X30Cr13
X46Cr13
Chemical Composition
Physical Properties
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℃）
Thermal Conductivity
24.7 W/(m・K)
Melting Range
1454-1510 ℃
Magnetism
Strong
Mechanical Properties
We can manufacture according to your desired hardness between annealed to full hardened as shown in the table below.(The hardness of hardened steel strip is to be discussed each by each)
Some finishes may not be available depending on the thickness of the sheet, so please consult with us first.
*For ultra-thin foil, soft materials such as annealed or BA finish may not be applicable due to concerns about defects (folding, wrinkling, etc.).
Quenching and Tempering
SUS420J2 can be hardened by quenching and tempering.
The max quenched hardness is ［589-640HV］.
Please select tempering temperature according to required hardness and toughness by referencing quenching and tempering curve.
Related Pages
Steels for Blades
Material which is used to make various blades such as razor blades, shaver blades, and medical blades. Depending on the application and required properties, you can choose from a variety of options such as high carbon steel or martensitic stainless steel.
Martensitic Stainless Steels
They have a high carbon content and can acquire extremely high strength if quenched after stamping.
Hardened Stainless Steels
We provide quenched stainless steel strips.
Stainless Steels for Springs
This materials are possible to increase their hardness by rolling, they can be used as spring parts.