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Quenched Stainless Steel (SUS420J2, RB-S)

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Main applications

Various springs, blades, rulers, soldering irons, scrapers, doctor blades, and spinning machines


Product size range

 Thickness: 0.30~2.5mm

     Width: 3.0~250mm

Manufacturing sites

SHANGHAI


  • Product overview Features
  • Standards & Chemical composition
  • Tokkin Advantages
  • Physical Properties Mechanical properties

Product overview

SUS420J2 and RB-S are classified as martensitic stainless steels.

Like carbon steels, few stainless steels harden when heat treated—such materials are limited to precipitation hardening stainless steels and medium- to high-carbon chromium stainless steels.

Although martensitic stainless steels are stainless steels, they have a high percentage content of carbon and, like carbon steels, can be made very hard through quenching and tempering.

 

Most customers who quench SUS420J2 and RB-S perform heat treatment after each product has been formed.

However, in recent years, advances in processing facilities and technologies aimed at streamlining the production process have made it possible to manufacture efficient products with little variation through the use of continuous presses, cutting, and other methods, even when processing extremely hard materials such as hard-finished steel strips and quenched steel strips.

 

Due to the complex nature of quality control and work management associated with heat treating products after processing, and the fact that productivity is low, there is an increasing trend toward using pre-quenched steel strips instead of quenching products after forming.

 

To meet customer requests for the unique properties and hardness of stainless steel, and high quality, we supply quenched stainless steel strips.

*Quenching work is performed at our Shanghai factory.

Features

• Suited to applications that require wear resistance and heat resistance

SUS420J2 and RB-S grades are ideal stainless steels for applications that require wear resistance. They have high tempering resistance and can also be used for applications that require heat resistance.

 

• Low mechanical and physical directional properties

Due to the effects of structural transformation, SUS420J2 and RB-S have low mechanical and physical directional properties compared to austenitic spring steels hardened by rolling.

 

• Saving thickness and width

As SUS420J2 and RB-S are martensitic stainless steels, they have a higher Young's modulus than nonferrous and austenitic spring metals, making it possible to reduce the thickness and width of flat springs.

Standard

TOKKIN

Designation

International

Standard

USA

Europe

 UK

Germany

France

Russia

China

Japan

ISO

UNS

AISI,ASTM

EN

BS

DIN

NF

ΓOCT

GB

JIS

SUS420J2

5

S42000

420

X30Cr13

420

S45

X30Cr13

Z33C13

30X13

3Cr13

SUS420J2

 

Chemical composition

TOKKIN

Designation

Chemical composition(%)

C

Si

Mn

P

S

Cr

Ni

Mo

SUS420J2

0.26~0.40

≦1.00

≦1.00

≦0.040

≦0.030

12.00~14.00

-

-

RB-S

0.58~0.70

≦1.00

≦1.00

≦0.040

 *1

≦0.015

*2

12.50~14.50

-

-

*1  Less than 0.030   *2  about 0.002

Tokkin Advantages

 Excellent flatness

Our original quenching method ensures wide materials with excellent flatness.

 

 High-precision thickness tolerances

We can manufacture materials with more-precise thickness tolerances that regular JIS products and competitors products cannot match.

 

 Flexible, small-lot production

We can manufacture standard lots weighing 300 kg or more,

and are also happy to consider smaller lots upon consultation.

(Requests for small-lot orders will be dealt with on a case-by-case basis.)

 

 Ability to adjust materials to desired hardness

We make products to order, and can adjust hardness as required.

Physical propaties

TOKKIN

Designation

Density

 

g/cm3

Specific heat

 

J(kg·K)

Coefficient of thermal expansion

 

(0~100℃)10-6/K

Thermal conductivity

 

W/(m·K)

Electric

resistance

 

μΩ·cm

Young's modulus

 

N/mm2

SUS420J2

7.75

460

10.3×10-6/K

24.7

55

200,000

RB-S

7.70

430

-

25.0

60

220,000

 

Mechanical properties

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