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Martensitic Stainless Steel 410 for Brake Disks

DSM developed a high heat resistant steel,DSM-41D001. The steel is capable of maintaining proper hardness over a long period of time in comparison with conventional steels,even at temperatures exceeding 500°C, by controlling the precipitation morphology of carbonitrides in the steel in the tempering process.

  • DSM-410SC

  • DSM

  • 1.4006

  • 410

  • SUS410

  • 12Cr13

  • Good corrosion resistance, machinability, general purpose, cutting tools,Brake Disks


What is 410 Stainless steel?

Stainless steel 410, a martensitic steel of general use for high stress parts, provides excellent corrosion resistance and is strong and hard. The minimum amount of chromium in stainless steel 410 is 11.5%, which is sufficient to provide corrosion resistance in mild environments, such as steam and mild chemicals. This is a general-purpose grade, which is usually supplied in a hardened condition but is still machinable for applications that require high strength with moderate heat resistance and corrosion resistance. The corrosion resistance of stainless steel 410 is maximum when it has been hardened, temper and polished.


Why 410 Stainless steel is good for brake rotor making? 

Motorcycles are equipped with disk brake systems because they radiate heat effectively and stabilize the brake performance. The disk brake system slows a motorcycle down by frictional forces generated when brake pads are clamped on a rotor that is rotating in linkage to a wheel. The rotor must be hard enough (generally Rockwell hardness 32-38HRC), to ensure wear resistance and deformation resistant, as well as sufficient heat resistance in order to maintain these qualities under the heat generated during braking.

For the sake of aesthetics and to maintain brake performance, corrosion resistance is required. For rotors, martensitic steel is used, as it provides both corrosion and heat resistance.

Normal Level C Si Mn P S Cr Ni Nb N
0.11 0.53 0.82 0.024 0.001 11.91 0.1

SUS410 (11.91%Cr - 0.11%C), was traditionally used mainly as rotor material. These steels are excellent in heat resistance but require a two-stage heat treatment consisting of quenching, tempering, and annealing to achieve the desired hardness. Their corrosion resistance is also somewhat inadequate.


The Better Stainless Steel for Making Rotor Disc

DSM has developed a steel that is highly heat resistant, DSM-41D001, to meet this need. This steel can maintain its hardness for a longer period of time than conventional steels. It is able to do this by controlling the morphology and precipitation of carbonitrides during the tempering process.

018-2(1) Addition of Nb improves temper softening resistance. It can be considered that the fine Nb(C, N) which had precipitated in the as-quenched condition maintains its size in the tempering process and suppresses the recovery of dislocations.

(2) Increase in the content of N also improves temper softening resistance. The reason for this can be considered that the amount of coarse M23C6 at prior γ grain boundaries, which does not contribute to strengthening, decreases and on the other hand, the increase of solute (C + N) content and the precipitated fine Cr2(C, N) suppress the recovery of dislocations.

(3) A composite effect of (1) and (2) is obtained by Nb addition and increase of N at the same time, resulting in a large improvement in temper softening resistance.

(4) The developed DSM-41D001, which is 11.93%Cr,1.47%Mn,0.006%Nb,0.01%N steel, maintains proper hardness for rotor material (32–38HRC) even after tempering at 550°C for 60 min, and thus has excellent temper softening resistance in comparison with the existing steel.

C Si Mn P S Cr Ni Nb N
DSM-41D001 0.062 0.47 1.47 0.019 0.002 11.93
0.006 0.01

Y.S. T.S. EL Hardness Bend

Inside Radius


Normal Level 422 603 26.5

DSM-41D001 428 613 23

(5) The developed steel has high corrosion resistance,showing only slight rusting after a 96 h salt spray test in comparison with the existing steel, and has higher pitting potential also.

The developed high heat resistant steel is expected to contribute to improving various problems in connection with disk brake performance,including wear, warping and such of the rotor arising from enhancing road performance in motorcycles. The new steel is able to compensate for a decrease in heat capacity that is commensurate to the high heat resistance. This material will contribute to thinner and more compact brake disks, as well as greater design freedom.



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