Effect of Environment

(1)P The detail category Aac given in Tables 5.1.1 to 5.1.5 and 5.2.2 shall be reduced in accordance with Table 5.4.1 for certain combinations of alloy and environment where the average ambient temperature during the life does not exceed 65°C.

NOTE: For marine environment the average ambient temperature during the life should not exceed 30°C.

Table 5.4.1 Number of detail categories by which Acc shall be reduced according to environment and alloy !)

Table 5.4.1 Number of detail categories by which Acc shall be reduced according to environment and alloy !)

Alloy

Environment

Composition

Protec-tion ratings (see Part 1.1)

Rural

Industrial/Urban

Marine

Immersed

Moderate

Severe

Non-Industrial

Moderate

Severe

Fresh Water

Sea Water

30003)

AlMnCu

A

-

-

(P)

-

-

.5)

-

.5)

5000

AlMg

A

0

0

(P)4)

0

0

05)

0

05)

5000

AlMgMn

A

0

0

(P)4)

0

0

05)

0

15>

6000

AlMgSi

B

0

0

(P)4)

0

0

15>

0

25)

7000

AlZnMg

C

0

0

(P)4)

0

0

25)

1

3s)

Note 2: For conditions where table 5.4.1 requires a reduction in detail category and the average temperature exceeds 30°C specialist advice should be sought. Note 3: Data not available

Note 4: (P) very dependent on chemistry of environment. Regularly maintained protection may be required to avoid risk of local exposures which may be particularly detrimental to crack initiation. Note 5 :The value of ND should be increased from 5x106 to 107 cycles. The value of NL should be increased from 108 to 2xl08 cycles

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