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AC 43.13-1B CHG 1 9/27/01 b. There are numerous steels with higher percentages of alloying elements that do not fit into this numbering system. These include a large group of stainless and heat resisting al loys in which chromium is an essential alloy ing element. Some of these alloys are identi fied by three digit AISI numbers and many others by designations assigned by the steel company that produces them. The few exam ples in table 4-3 will serve to illustrate the kinds of designations used and the general al loy content of these steels. c. “1025” welded tubing as per Specification MIL-T-5066 and “1025” seamless tubing con forming to Specification MIL-T-5066A are inter changeable. 4-3. INTERCHANGEABILITY OF STEEL TUBING. a. “4130” welded tubing conforming to Specification MIL-T-6731, and “4130” seam-less tubing conforming to Specification MIL-T-6736 are interchangeable. b. NE-8630 welded tubing conforming to Specification MIL-T-6734, and NE-8630 seamless tubing conforming to Specification MIL-T-6732 are interchangeable. 4-4. IDENTIFICATION OF ALUMINUM. To provide a visual means for identifying the various grades of aluminum and aluminum alloys, such metals are usually marked with symbols such as a Government Specification Number, the temper or condition furnished, or the commercial code marking. Plate and sheet are usually marked with specification numbers or code markings in rows approximately 5 inches apart. Tubes, bars, rods, and extruded shapes are marked with specification numbers or code markings at intervals of 3 to 5 feet along the length of each piece. The commercial code marking consists of a number which identifies the particular compo sition of the alloy. In addition, letter suffixes (see table 4-4) designate the basic temper des ignations and subdivisions of aluminum alloys. TABLE 4-2. Numerical system for steel identification. TYPES OF STEELS NUMERALS AND DIGITS Plain carbon steel 10XX Carbon steel with additional sulfur for easy 11XX machining. Carbon steel with about 1.75% manganese 13XX .25% molybdenum. 40XX 1% chromium, .25% molybdenum 41XX 2% nickel, 1% chromium, .25% molybdenum 43XX 1.7% nickel, .2% molybdenum 46XX 3.5% nickel, .25% molybdenum 48XX 1% chromium steels 51XX 1% chromium, 1.00% carbon 1.5% chromium steels 52XX 51XXX 1.5% chromium, 1.00% carbon 1% chromium steel with .15% vanadium 61XX .5% chromium, .5% nickel, .20% molybde- 86XX num .5% chromium, .5% nickel, .25% molybde- 87XX num 2% silicon steels, .85% manganese 92XX 3.25% nickel, 1.20% chromium, .12% mo- 93XX lybdenum 52XXX Page 4-2 Par 4-2PDF Image | AFS-640
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