Corrosion and hydrogen resistant martensitic stainless steels ACD^™602,ACD^™627

It is possible to extend the life of parts in various corrosive environment and high-pressure hydrogen, by taking advantage of high hardness and resistance to corrosion and hydrogen embrittlement.

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ACD^™602 and ACD^™627 obtain high surface hardness and corrosion resistance by nitriding-quenching. They keep their ductility even when exposed to high-pressure hydrogen. Such characteristics contribute to extend the life of ICE parts compared with common martensitic stainless steels.

Corrosion resistance

5％ CH₂O₂ : ACD627 shows 1/20 of corrosion rate compared with SUS420J2.
pH1.5 H₂SO₄ : ACD627 shows 1/9 of corrosion rate compared with SUS420J2.

Corrosion rate (mg/h/cm²)

SUS420J2

SUS440C

ACD602

ACD627

5%CH₂O₂-24h

pH1.5 H₂SO₄-5h

Temperature : 50℃

Resistance to hydrogen embrittlement

ACD602 and ACD627 achieve both high tensile strength and good ductility in 10MPa of hydrogen.
ACD602 exhibits high hydrogen resistance with 1800MPa of tensile strength and more than 30% of RA.

Reduction of area in H₂ [%]

Tensile strength in H₂ [MPa]

A286

FCD400

ACD602

ACD627

SUS440C

ACD602

RA: 31%

1mm

ACD627

RA: 25%

SUS440C

RA: 0%

Specimen

Tensile

H₂ gas(10MPa)

Strain rate:5×10^-5 (/s)

ApplicationsFuel injector (biofuel, e-fuel, hydrogen, etc.)

The characteristic values, photographs, charts, rankings, evaluations, etc. shown in this catalog are representative values based on our test data and do not guarantee the quality of the products. The information in this catalog is subject to change without notice.