Japanese Automobile Standards — H Steels
Chemical Composition, %
No. Steel Grade C Si Mn P S Ni Cr Mo B Cu
34 ASMn420H .17/.23 .15/.35 1.15/1.55 .030 max .030 max .25 max .35 max — — .30 max
35 ASMn425H .22/.28 .15/.35 1.15/1.55 .030 max .030 max .25 max .35 max — — .30 max
36 ASMn430H .27/.34 .15/.35 1.15/1.55 .030 max .030 max .25 max .35 max — — .30 max
37 SMn433H .29/.36 .15/.35 1.15/1.55 .030 max .030 max .25 max .35 max — — .30 max
38 ASMn435H .32/.39 .15/.35 1.15/1.55 .030 max .030 max .25 max .35 max — — .30 max
39 SMn438H .34/.41 .15/.35 1.30/1.70 .030 max .030 max .25 max .35 max — — .30 max
40 ASMn440H .37/.44 .15/.35 1.30/1.70 .030 max .030 max .25 max .35 max — — .30 max
41 ASMn443H .40/.47 .15/.35 1.30/1.70 .030 max .030 max .25 max .35 max — — .30 max
42 ASMn448H .45/.52 .15/.35 1.30/1.70 .030 max .030 max .25 max .35 max — — .30 max
43 ASMn453H .50/.57 .15/.35 1.30/1.70 .030 max .030 max .25 max .35 max — — .30 max
44 ASMnB220H .17/.23 .15/.35 1.10/1.40 .030 max .030 max .25 max .35 max — .0005 min .30 max
45 ASMnB233H .29/.36 .15/.35 1.10/1.40 .030 max .030 max .25 max .35 max — .0005 min .30 max
46 ASMnB422H .19/.25 .15/.35 1.20/1.50 .030 max .030 max .25 max .35 max — .0005 min .30 max
47 ASMnB425H .22/.28 .15/.35 1.20/1.50 .030 max .030 max .25 max .35 max — .0005 min .30 max
48 ASMnB433H .29/.36 .15/.35 1.20/1.50 .030 max .030 max .25 max .35 max — .0005 min .30 max
49 ASMnB443H .40/.47 .15/.35 1.20/1.50 .030 max .030 max .25 max .35 max — .0005 min .30 max
50 ASMnC420H .17/.23 .15/.35 1.15/1.55 .030 max .030 max .25 max .35/.70 — — .30 max
51 SMnC443H .39/.46 .15/.35 1.30/1.70 .030 max .030 max .25 max .35/.70 — — .30 max
52 ASMnC520H .17/.23 .15/.35 1.15/1.55 .030 max .030 max .25 max .85/1.25 — — .30 max
53 ASMnC543H .39/.46 .15/.35 1.30/1.70 .030 max .030 max .25 max .85/1.25 — — .30 max
54 ASMnCB440H .37/.44 .15/.35 .80/1.20 .030 max .030 max .25 max .30/.70 — .0005 min .30 max
55 SCr415H .12/.18 .15/.35 .80/1.20 .030 max .030 max .25 max .85/1.25 — — .30 max
56 ASCr418H .15/.21 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
57 SCr420H .17/.23 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
58 ASCr423H .20/.26 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
59 ASCr425H .22/.28 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
60 SCr430H .27/.34 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
61 SCr435H .32/.39 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
62 SCr440H .37/.44 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
63 ASCr445H .42/.49 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — — .30 max
64 ASCB435H .32/.39 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — .0005 min .30 max
65 ASCB440H .37/.44 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 — .0005 min .30 max
66 ASCM115H .12/.18 .15/.35 .60/.90 .030 max .030 max .25 max .35/.65 .08/.15 — .30 max
67 ASCM118H .15/.21 .15/.35 .60/.90 .030 max .030 max .25 max .35/.65 .08/.15 — .30 max
68 ASCM120H .17/.23 .15/.35 .60/.90 .030 max .030 max .25 max .35/.65 .08/.15 — .30 max
69 ASCM125H .22/.28 .15/.35 .60/.90 .030 max .030 max .25 max .35/.65 .08/.15 — .30 max
70 ASCM315H .12/.18 .15/.35 .65/1.00 .030 max .030 max .25 max .85/1.25 .08/.15 — .30 max
71 ASCM318H .15/.21 .15/.35 .65/1.00 .030 max .030 max .25 max .85/1.25 .08/.15 — .30 max
72 ASCM320H .17/.23 .15/.35 .65/1.00 .030 max .030 max .25 max .85/1.25 .08/.15 — .30 max
73 ASCM325H .22/.28 .15/.35 .65/1.00 .030 max .030 max .25 max .85/1.25 .08/.15 — .30 max
74 SCM415H .12/.18 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
75 SCM418H .15/.21 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
76 SCM420H .17/.23 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
77 ASCM430H .27/.34 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
78 SCM435H .32/.39 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
79 SCM440H .37/.44 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
80 SCM445H .42/.49 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .15/.35 — .30 max
81 SCM822H .19/.25 .15/.35 .55/.90 .030 max .030 max .25 max .85/1.25 .35/.45 — .30 max
82 SNCM220H .17/.23 .15/.35 .60/.95 .030 max .030 max .35/.75 .35/.65 .15/.30 — .30 max
83 SNCM420H .17/.23 .15/.35 .40/.70 .030 max .030 max 1.55/2.00 .35/.65 .15/.30 — .30 max

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