Carbon steels:

Index Percent Relative to 1212 Carbon Steel

1212

100%

1015

72%

1020

72%

1022

78%

1030

70%

1040

64%

1042

64%

1050

54%

1095

42%

1117

91%

1137

72%

1141

70%

1141 annealed

81%

1144

76%

1213

136%

12L14

170%

1215

136%

Alloy steels:

 Index Percent Relative to 1212 Carbon Steel

2355 annealed

70%

4130 annealed

72%

4140 annealed

66%

4142 annealed

66%

41L42 annealed

77%

4150 annealed

60%

4340 annealed

57%

4620

66%

4820 annealed

49%

52100 annealed

40%

6150 annealed

60%

8620

66%

86L20

77%

9310 annealed

51%

Stainless Steels and Super Alloys:

 Index Percent Relative to 1212 Carbon Steel

302 annealed

45%

303 annealed

78%

304 annealed

45%

316 annealed

45%

321 annealed

36%

347 annealed

36%

410 annealed

54%

416 annealed

110%

420 annealed

45%

430 annealed

54%

431 annealed

45%

440A

45%

15-5PH

48%

17-4PH

48%

A286 aged

33%

Hastelloy X

19%

Tool Steels:

Index Percent Relative to 1212 Carbon Steel

A-2

42%

A-6

33%

D-2

27%

D-3

27%

M-2

39%

O-1

42%

O-2

42%

Gray Cast Iron:

 Index Percent Relative to 1212 Carbon Steel

ASTM class 20 annealed

73%

ASTM class 25

55%

ASTM class 30

48%

ASTM class 35

48%

ASTM class 40

48%

ASTM class 45

36%

ASTM class 50

36%

Aluminum and Magnesium Alloys:

 Index Percent Relative to 1212 Carbon Steel

aluminum, cold drawn

360%

aluminum, cast

450%

aluminum, die cast

76%

magnesium, cold drawn

480%

magnesium, cast

480%