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Chapter 7 Steel Fasteners
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MECHANICAL PROPERTIES OF AUSTENITIC STEEL BOLTING FOR HIGH
TEMPERATURE SERVICE
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Tensile Strength |
Yield Strength |
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ASTM A 193 |
ksi (MPa) |
ksi (MPa) |
% El (4D) |
% R.A. |
Hardness |
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Class, Grade & Diameter |
min |
min |
min |
min |
max |
| Classes
1 & 1D: B8, B8C, B8M, B8T, |
75 (515 |
30 (205) |
30 |
50 |
223 HBa or 96 HRB |
| B8LN,
B8MLN, all diameters |
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| Class
1A: B8A, B8CA, B8MA, B8PA, B8TA |
75 (515) |
30 (205) |
30 |
50 |
192 HB or 90 HRB |
| B8LNA,
B8MLNA, B8NA, B8MNA, |
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| all
diameters |
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| Classes
1B & 1D: B8N, B8MN, |
80 (550) |
35 (240) |
30 |
40 |
223 HBa or 96 HRB |
| B8MLCuN,
all diameters |
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|
271 HB or 28 HRC |
| Classes
1C & 1D: B8R, all diameters |
100 (690) |
55 (380) |
35 |
55 |
271 HB or 28 HRC |
| B8RA,
all diameters |
100 (690) |
55 (380) |
35 |
55 |
271 HB or 28 HRC |
| B8S,
all diameters |
95 (655) |
50 (345) |
35 |
55 |
271 HB or 28 HRC |
| B8SA,
all diameters |
95 (655) |
50 (345) |
35 |
55 |
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| Class
2: B8, B8C, B8P, B8T, B8N, |
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| B8MLCuN
3/4 (20) and under |
125 (860) |
100 (690) |
12 |
|
321 HB or 35 HRC |
| over
3/4 to 1 (20 to 25) incl |
115 (795) |
80 (550) |
15 |
35 |
321 HB or 35 HRC |
| over
1 to 1 1/4m(25.4 to 31.6) incl |
105 (725) |
65 (450) |
20 |
35 |
321 HB or 35 HRC |
| over
1 1/4 to 1 1/2 (32 to 40) incl |
100 (690) |
50 (345) |
28 |
45 |
321 HB or 35 HRC |
| Class
2: B8M, B8MN, B8MLCuN |
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| 3/4
(19.05) and under |
110 (760) |
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|
| over
3/4 to 1 (19.05 to 25.4) incl |
80 (550) |
80 (550) |
20 |
46 |
321 HB or 35 HRC |
| over
1 to 1 1/4 (25.4 to 31.6) incl |
65 (450) |
65 (450) |
25 |
45 |
321 HB or 35 HRC |
| over
1 1/4 to 1 1/2 (31.6 to 37.9) incl |
50 (345) |
50 (345) |
30 |
45 |
321 HB or 35 HRC |
| Class
2B: B8M2 |
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|
|
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|
| 2
(50.8) and under |
95 (655) |
75 (515) |
25 |
40 |
321 HB or 35 HRC |
| over
2 to 2 1/2 (50.8 to 63.2) |
90 (620) |
65 (450) |
30 |
40 |
321 HB or 35 HRC |
| over
2 1/2 to 3 (63.2 to 76.2) |
80 (550) |
55 (380) |
30 |
40 |
321 HB or 35 HRC |
| Class
2C: |
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| 2
(50.8) and under |
85 (585) |
65 (450) |
30 |
60 |
321 HB or 35 HRC |
| over
2 (50.8) |
85 (585) |
60 (415) |
30 |
60 |
321 HB or 35 HRC |
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a. For sizes 3/4 in (20 mm) in diameter and smaller, a maximum hardness of
241 HB (100 HRB) is permitted. |
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