US 12,352,309 B2 · Crankshaft

Abstract

A crankshaft with improved seizure resistance is provided. A crankshaft (10) is a crankshaft including journals (11) and pins (12), having a chemical composition of, in mass %: 0.35 to 0.40% C; up to 0.70% Si; 1.00 to 2.00% Mn; up to 0.50% Cr; up to 0.050% Al; up to 0.020% N; up to 0.020% P; 0.005 to 0.200% S; and balance Fe and impurities, each of the journals (11) and pins (12) having a surface microstructure containing tempered martensite in not less than 80 volume % and a surface hardness not higher than HV 450.

Claims6

Dependent claims

A crankshaft comprising a journal and a pin, the crankshaft having a chemical composition of, in mass %:

0.35 to 0.40% C;
up to 0.70% Si;
1.00 to 2.00% Mn;
up to 0.50% Cr;
up to 0.050% Al;
up to 0.020% N;
up to 0.020% P;
0.005 to 0.200% S;
and
balance Fe and impurities,
for each of the journal and the pin, a microstructure of a surface containing tempered martensite in not less than 80 volume % and a hardness of the surface being not higher than HV 450.

8 more elements

Dependencies are inferred from the claim text.

Crankshaft

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Crankshaft

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Abstract

Claims6