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Watercraft

產品應用編號：Chromium molybdenum steel

Components for waterborne vehicles, operating in prolonged navigation and vibration environments, require good fatigue resistance to prevent part fractures and failures. These components need to possess sufficient strength and toughness to ensure the stability and safety of the vessel's structure. Special material selection, design, and manufacturing processes can enhance the fatigue life of the parts. Commonly used steel grades include SCM415 and SCM435.

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Steel Grade & Chemical Composition
Hardness Conversion Table

Cr-Mo Steel		Chemical Conposion(%)
JIS	SAE	C	Si	Mn	P	S	Cu	Ni	Cr	Mo
SCM415		0.13 ~ 0.18	0.15 ~ 0.35	0.60 ~ 0.90	≦0.030	≦0.030	≦0.30	≦0.25	0.90 ~ 1.20	0.15 ~ 0.25
SCM420		0.18 ~ 0.23	0.15 ~ 0.35	0.60 ~ 0.90	≦0.030	≦0.030	≦0.30	≦0.25	0.90 ~ 1.20	0.15 ~ 0.25
SCM430		0.28 ~ 0.33	0.15 ~ 0.35	0.60 ~ 0.90	≦0.030	≦0.030	≦0.30	≦0.25	0.90 ~ 1.20	0.15 ~ 1.30
	SAE4130	0.28 ~ 0.33	0.15 ~ 0.35	0.40 ~ 0.60	≦0.030	≦0.040			0.80 ~ 1.10	0.15 ~ 0.25
SCM435		0.33 ~ 0.38	0.15 ~ 0.35	0.60 ~ 0.90	≦0.030	≦0.030	≦0.30	≦0.25	0.90 ~ 1.20	0.15 ~ 0.30
SCM440		0.38 ~ 0.43	0.15 ~ 0.35	0.60 ~ 0.90	≦0.030	≦0.030	≦0.30	≦0.25	0.90 ~ 1.20	0.15 ~ 0.30

Cr Steel		Chemical Conposion(%)
JIS	Nippon steel	C	Si	Mn	P	S	Cu	Ni	Cr	Nb
SCr420		0.18 ~ 0.23	0.15 ~ 0.35	0.60 ~ 0.90	≦0.030	≦0.030	≦0.30	≦0.25	0.90 ~ 1.20
	N50CRN	0.50 ~ 0.55	0.15 ~ 0.35	0.65 ~ 0.85	≦0.010	≦0.010			0.40 ~ 0.60	0.20 ~ 0.35