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Tolerances and Machining Allowances Hot Forged products
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dimension |
For products with lengths > 6000 mm., the tolerances and allowances are to be agreed in the purchase order |
|
b
or
h |
carbon steels and low-alloy steels
L 3500
max |
carbon steels and low-alloy steels
L 3500
-
6000 |
high alloyed steels
L 3500
max |
|
after |
(% of every alloy elements < 5) |
(% of every alloy element < 5) |
(% of every alloy element = 5) |
|
machining |
increese |
deviation |
increese |
deviation |
increese |
deviation |
increese |
deviation |
increese |
deviation |
increese |
deviation |
|
mm |
b
or
h
(2 a) |
B
or
H |
l
(2 a) |
L |
b
or
h
(2 a) |
B
or
H |
l
(2 a) |
L |
b
or
h
(2 a) |
B
or
H |
l
(2 a) |
L |
|
> 100 |
< 125 |
14 |
± 3,8 |
17 |
+ 17 / - 10 |
17 |
± 4,8 |
22 |
+ 21 / - 13 |
10 |
± 2,0 |
16 |
+ 14 / - 11 |
|
> 125 |
< 160 |
16 |
± 4,2 |
19 |
+ 18 / - 11 |
19 |
± 5,4 |
24 |
+ 22 / - 14 |
12 |
± 2,3 |
18 |
+ 14 / - 11 |
|
> 160 |
< 200 |
18 |
± 4,9 |
22 |
+ 20 / - 13 |
21 |
± 6,3 |
26 |
+ 22 / - 15 |
14 |
± 2,8 |
20 |
+ 14 / - 14 |
|
> 200 |
< 250 |
21 |
± 5,6 |
24 |
+ 22 / - 14 |
24 |
± 7,2 |
29 |
+ 26 / - 17 |
17 |
± 3,4 |
23 |
+ 16 / - 16 |
|
> 250 |
< 315 |
25 |
± 6,5 |
28 |
+ 26 / - 15 |
28 |
± 8,4 |
32 |
+ 29 / - 19 |
21 |
± 4,2 |
26 |
+ 18 / - 18 |
|
> 315 |
< 400 |
30 |
± 7,7 |
32 |
+ 28 / - 18 |
33 |
± 10,0 |
36 |
+ 33 / - 22 |
26 |
± 5,1 |
30 |
+ 21 / - 21 |
|
> 400 |
< 500 |
36 |
± 9,2 |
38 |
+ 33 / - 22 |
40 |
± 11,9 |
42 |
+ 38 / - 25 |
32 |
± 6,3 |
36 |
+ 25 / - 25 |
|
> 500 |
< 630 |
44 |
± 11,0 |
45 |
+ 39 / - 25 |
48 |
± 14,3 |
49 |
+ 46 / - 29 |
39 |
± 7,8 |
42 |
+ 29 / - 29 |
|
> 630 |
< 800 |
54 |
± 13,5 |
55 |
+ 45 / - 30 |
58 |
± 17,4 |
58 |
+ 51 / - 34 |
49 |
± 9,8 |
52 |
+ 35 / - 35 |
|
> 800 |
< 1000 |
66 |
± 16,3 |
67 |
+ 55 / - 36 |
71 |
± 21,3 |
69 |
+ 61 / - 41 |
61 |
± 12,1 |
63 |
+ 42 / - 42 |
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Measures are expressed in mm |
|
Example : unalloyed steels round
b
= 330 mm and
l
= 3500 mm. Diameter of turned raw material
B
= 330 + 30 = 360 ± 7,7 |
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|
dimension |
For products with lengths > 6000 mm., the tolerances and allowances are to be agreed in the purchase order |
|
b
or
h |
low alloy steel
L 3500
-
6000 |
tool steels
L 3500
max |
tool steels
L 3500
-
6000 |
|
after |
(% of every alloy elements = 5) |
|
|
|
machining |
increese |
deviation |
increese |
deviation |
increese |
deviation |
increese |
deviation |
increese |
deviation |
increese |
deviation |
|
mm |
b
or
h
(2 a) |
B
or
H |
l
(2 a) |
L |
b
or
h
(2 a) |
B
or
H |
l
(2 a) |
L |
b
or
h
(2 a) |
B
or
H |
l
(2 a) |
L |
|
> 100 |
< 125 |
13 |
± 4,0 |
21 |
+ 18 / - 12 |
7 |
± 1,5 |
14 |
+ 14 / - 11 |
10 |
± 2,1 |
17 |
+ 14 / - 10 |
|
> 125 |
< 160 |
15 |
± 4,6 |
22 |
+ 20 / - 13 |
9 |
± 1,8 |
15 |
+ 14 / - 11 |
12 |
± 2,5 |
19 |
+ 15 / - 12 |
|
> 160 |
< 200 |
18 |
± 5,2 |
25 |
+ 22 / - 14 |
11 |
± 2,2 |
17 |
+ 14 / - 14 |
14 |
± 2,9 |
21 |
+ 16 / - 14 |
|
> 200 |
< 250 |
21 |
± 6,0 |
27 |
+ 24 / - 16 |
13 |
± 2,6 |
20 |
+ 16 / - 16 |
17 |
± 3,5 |
23 |
+ 17 / - 17 |
|
> 250 |
< 315 |
24 |
± 7,0 |
30 |
+ 27 / - 18 |
16 |
± 3,2 |
23 |
+ 18 / - 18 |
21 |
± 4,2 |
26 |
+ 19 / - 19 |
|
> 315 |
< 400 |
29 |
± 8,4 |
35 |
+ 31 / - 21 |
19 |
± 4,0 |
27 |
+ 21 / - 21 |
26 |
± 5,0 |
30 |
+ 22 / - 22 |
|
> 400 |
< 500 |
35 |
± 10,0 |
40 |
+ 35 / - 24 |
24 |
± 4,9 |
32 |
+ 25 / - 25 |
32 |
± 6,2 |
35 |
+ 26 / - 26 |
|
> 500 |
< 630 |
42 |
± 12,0 |
47 |
+ 42 / - 28 |
30 |
± 6,0 |
38 |
+ 29 / - 29 |
39 |
± 7,5 |
41 |
+ 31 / - 31 |
|
> 630 |
< 800 |
52 |
± 14,9 |
55 |
+ 49 / - 33 |
37 |
± 7,4 |
47 |
+ 35 / - 35 |
49 |
± 9,4 |
49 |
+ 36 / - 36 |
|
> 800 |
< 1000 |
64 |
± 18,1 |
66 |
+ 59 / - 40 |
46 |
± 9,3 |
57 |
+ 42 / - 42 |
61 |
± 11,6 |
59 |
+ 44 / - 44 |
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Measures are expressed in mm |
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Example: tool steels round
b
= 260 mm and
l
= 4000 mm. Diameter of turned raw material
B
= 260 + 21 = 281 ± 4,2 |
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The ovalization , only for rounds, has not to be higher than the tolerance corresponding to diameter
B |
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Tolerances and allowances for flats are valid when we have the following relation: b/h = 8 quality, special, alloyed and unalloyed steelsi; b/h = 5 base unalloyed steels. |
|
Lucefin Group
has fixed the tolerance of rough products on
b
or
h
in
+ 1
mm /
+ 3
mm
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