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Maraging Steels (MAS-1)

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Main applications

Diaphragms, dot printer springs, continuously variable transmissions for automobiles, watch parts, computer parts, precision springs, and other components requiring a high level of reliability


Product size range

Thickness: 0.050mm-2.5mm  

Width     : 3.0mm-300mm

 
Manufacturing sites

JAPAN 


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

Product overview

Maraging steels were originally developed by US firm INCO. They are ultra-high-strength, age-hardened steels made from low-carbon 18% nickel steel to which Co, Mo, Ti, Al, and other materials are added as age-hardening elements.

In addition to providing extremely high strength through age hardening, maraging steels are used in aircraft, rockets, missiles, and satellites and other space exploration equipment due to their excellent toughness and high notch strength.

 

We supply MAS-1, a steel grade manufactured by Daido Steel.

MAS-1 is a typical ultra-high-strength steel that provides toughness and is also able to acquire strength of more than 1,960 N/mm2 through age hardening. It is used for watch parts, computer parts, precision springs, diaphragms, and other components requiring an extremely high level of reliability.

 

Features

• Tensile strength of over 1,960 N/mm2

MAS-1 can provide tensile strength of over 1,960 N/mm2 through comparatively simple age-hardening treatment.

This strength can be increased through cold working. For example, the tensile strength of cold-rolled MAS-1 with a reduction rate of 50 percent can reach 2,110 N/mm2 after age hardening.

 

• High strength and toughness

In addition to high strength, MAS-1 provides excellent toughness, and also has high notch and fatigue strength.

 

• Easy handling—Rapid cooling not required after heat treatment

Because MAS-1 does not require rapid cooling after age hardening, handling is easy, and there is very little deformation due to heat treatment.

It does not harden to a great extent due to cold working. (Vickers hardness increases by 40 HV with a rolling reduction rate of 50 percent)

 

• Expensive materials

As MAS-1 consists of 30 percent expensive elements such as Ni, Co, and Mo, it is one of the more expensive ferrous alloys.

However, these same materials give it comparatively good weldability and machinability.

Chemical composition

TOKKIN

Designation

Chemical composition(%)

C

Si

Mn

P・S

Ni

Co

Mo

Ti

Al

MAS-1

≦0.03

≦0.10

≦0.10

≦0.010

18.00

~19.00

8.50

~9.50

4.70

~5.20

0.50

~0.70

0.05

~0.15

Tokkin Advantages

 Flexible, ultra small-lot production

 We are the only company that deals with rerolled maraging steel.

We can also supply ultra small lots of MAS-1 from orders as small as several tens of kilograms.

*Normal minimum lot size is 300 kg

 

 Thin products

 We can manufacture foil products with a thickness of 0.10 mm and thinner.

 

 High-precision thickness tolerances

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

Physical properties

TOKKIN

Designation

Density

Specific heat

Coefficient of thermal expansion

Thermal conductivity

Electric resistance

Young's modulus

g/cm3

J(kg・K)

(20~480゜C)10-6/K

W/(m・K)

μΩ・cm

N/mm2

MAS-1

8.02

335

10.09

19.7(25℃)

60~70

182,000


Mechanical properties

Finishing

condition

Hardness test

Tensile test

Hardness

Tensile strength

Elongation

HV

N/mm2

%

Annealed

290~340

930~1,110

7-17

Full hard

340~400

1,110~1,370

1~3

 

     Fig. Cold-rolling reduction and Mechanical properties(Hardness, Tensile strength)

Heat Treatment Methods/Other

(1) Solution heat treatment: Metal kept at temperature of 820°–870°C for several minutes and then cooled.

As the Ms point is around 150°C, MAS-1 is a low-carbon martensite phase at room temperature and has a Vickers hardness of 300–330 HV.

For this reason, despite the fact that MAS-1 provides toughness, it cannot be worked like typical soft materials.

 

(2) Age hardening: Standard treatment involves keeping metal at temperature of 480°C for 3 hours.

Some variation in combination of temperature and time is allowed.

Refer to the graph below when making adjustments.

 

Graph: Influence of Aging Hardness Conditions

(3) Heat treatment atmosphere: Hydrogen or AX gas is appropriate.

 

(4) Corrosion resistance: Because MAS-1 is a high-alloy steel it is often assumed to be rustproof like stainless steels. However, since it does not contain the stainless component chromium, it requires the same rust-preventive measures that would be used for normal steels.

 

Related products
Precipitation Hardening Stainless Steels

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Precipitation hardening (heat treated) stainless steels are grades that can provide high strength. We supply SUS631 (17–7PH) and SUS632J1 (15–7PH) grades.

Details