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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

 

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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