FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 4. Metal Structure, Welding, and Brazing | 1. Identification of Metals | 4-4. Identification of Aluminum
9/27/01
AC 43.13-1B CHG 1
TABLE 4-3. Examples of stainless and heat-resistant steels nominal composition (percent)
ALLOY DESIGNATION
302
310
321
347
410
430
446
PH15-7 Mo
17-4 PH
CARBON
0.15
0.25
0.08
0.08
0.15
0.12
0.20
0.09
0.07
CHROMIUM
18
25
18
18
12.5
17
25
15
16.5
NICKEL
9
20
11
11
OTHER
Titanium
Columbium or
Tantalum
Nitrogen
7
Molybdenum,
Aluminum
4
Copper,
Columbium
or Tantalum
GENERAL CLASS OF STEEL
Austenitic
Austenitic
Austenitic
Austenitic
Martensitic, Magnetic
Ferritic, Magnetic
Ferritic, Magnetic
Precipitation
Hardening
Precipitation
Hardening
Par 4-5
Page 4-3