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| Alloy Steel and Stainless Steel Bolting Materials for Low- Temperature Service |
| ASTM A-320 |
L7 |
L7M |
B8 |
B8C |
B8M |
B8T |
| EQUIVALENCES |
AISI |
4140/42/45 |
4140/42/45 |
304 |
347 |
316 |
321 |
DIN |
12CrMo 19.05 |
X10Cr13 |
42CrMo4 |
42CrMo4 |
X5CrNi 18.09 |
X5CrNiMo 18.10 |
| CHEMICAL REQUERIMENTS |
(C) Carbon |
0,38-0,48 |
0,38-0,48 |
<0,08 |
<0,08 |
<0,08 |
<0,08 |
(Mn) Manganese |
0,75-1 |
0,75-1 |
<2 |
<2 |
<2 |
<2 |
(P) Phosphorus (máx.) |
0,035 |
0,035 |
0,045 |
0,045 |
0,045 |
0,045 |
(S) Sulfur (max.) |
0,04 |
0,04 |
0,03 |
0,03 |
0,03 |
0,03 |
(Si) Silicon |
0,35-0,45 |
<1 |
<1 |
<1 |
<1 |
<1 |
(Ni) Niquel |
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8-10,5 |
9-13 |
10-14 |
9,12 |
| (Cr) Chromium |
0,80-1,10 |
0,80-1,10 |
10-20 |
17-19 |
16-18 |
16-19 |
| (Mo) Molybdenum |
0,15-0,25 |
0,15-0,25 |
- |
- |
2-3 |
|
(Ti) Titanium (min.) |
- |
- |
- |
- |
- |
5 x C |
(Nb+Ta)Niobium+Tantalum |
- |
- |
- |
10 x C |
- |
- |
| MECHANICAL REQUERIMENTS |
Tensile Strength (min) |
Lbs/in2 |
125.000 |
100.000 |
75.000 |
75.000 |
75.000 |
75.000 |
| Kg/mm2 |
88 |
70,4 |
52,8 |
52,8 |
52,8 |
52,8 |
Yield Strength (min) |
Lbs/in2 |
105.000 |
80.000 |
30.000 |
30.000 |
30.000 |
30.000 |
| Kg/mm2 |
74 |
56 |
21 |
21 |
21 |
21 |
| Elong. (%) (min.) |
16 |
18 |
35 |
35 |
35 |
35 |
| Reduct. % (min.) |
50 |
50 |
50 |
50 |
50 |
50 |
| Test Temperature Cº |
-101 |
-73 |
- |
- |
- |
- |
Impact (min) |
ft-lb |
20 |
20 |
1) |
2) |
1) |
2) |
| J |
27 |
27 |
1) |
2) |
1) |
2) |
| |
1) Above -200ºC is not necessary impact tests.
2) Above -255ºC is not necessary impact tests.
NOTA: Hardness values "are not mandatory for these materials", therefore, they do not reflect the accuracy of treatments and test performed. |
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