If you need precision metal materials, you need Tokushu Kinzoku Excel Co., Ltd.

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 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

Mechanical properties

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.