Metal and Steel Classification ASTM, AISI, SAE, ISO and other codes. Metal Classification Deciphering the Codes. Introduction. For the many different metals and alloys sold today, nearly as many classification systems exist to keep all the standards straight within the industry. Students and apprentices should become familar with at least a couple of them early on in their training. Generally, welders refer to three key bodies when it comes to the numbers the American Iron and Steel Institute AISI, which classifies steels the Society of Automobile Engineers SAE, which classifies all metals used on motor vehicles and the American Society of Mechanical Engineers ASME, which oversees codes that pertain to pressure vessels, fittings and pipe. The American Petroleum Institute API maintains some 5. These cover the oil and gas industry. Meanwhile, the American Society for Testing and Materials ASTM has compiled some 1. On aluminum stock, you may see labeling from the Aluminum Association AA. Finally, the U. S. Military MIL and some federal government agencies have their own codes. For an example of how different classifications line up against each other, heres a crossreferenee chart. Naturally, theres a body set up to oversee all these standards developing organizations. Its known as the American National Standards Institute ANSI. On the global front, theres the International Organization for Standardization ISO, which attempts to consolidate various national stock codes worldwide. In the 1. 97. 0s, a Unified Numbering System for Metals and Alloys UNS was jointly put into play by ASTM and SAE. AMSOIL Synthetic Compressor Oil ISO 68, SAE 30. The correct viscosity grade compressor oil is recommended for use in rotary screw, rotary vane, reciprocating and. An inline style check valve intended for blocking fluid flow. Learn about the different kinds of wrenches and how to use them properly and for their intended use. Legal Disclaimer tinytinytiny. All visual depictions displayed on here, whether they are actual sexually. MTA2M1gxNjAw/z/jroAAOxyTjNSfjCi/$(KGrHqYOKpkFJsyPK904BSfjCiiLLw~~60_3.jpg' alt='Sae Crack' title='Sae Crack' />Long story short Be prepared to see this alphabet soup on the labels of any new metal stock you weld on, both in the shop and out in the field. The American Welding Society, incidentally, classifies filler rods and stick electrodes used by welders, but not the base metals themselves. See Consumeables for info. Carbon and Alloyed Steels. Most ironworkers are aquainted with carbon steel, since tons of this material go into building bridges, high rises and pipelines each year. This steel begins as iron oxide in rocks like hematite and magnetite, and during its processing carbon gets added to create the material we know as steel. In particular, cold rolled steel labeled A3. Cold rolled means that the stock is shaped at room temperature. Once installed on a construction site, and often even before that, this framing usually has to be welded together. In manufacturing, both cold rolled and hot rolled steel are used in a variety of alloys. An alloy is defined as a separate element or compound added to the base metal, like nickel or chromium. Steel framing classifications mostly come from ASTM. The code starts with the letter A, followed by a number ranging anywhere from 1 to 1. Theres a complete listing of the various specifications at the ASTM website, but heres a sampling for common stock used in construction. A3. 6A3. 6M 0. 8    Carbon Structural Steel. A5. 3A5. 3M 1. 0    Pipe, Steel, Black and Hot Dipped, Zinc Coated Welded Seamless. A2. 42A2. 42. M 0. R2. 00. 9     High Strength Low Alloy Structural Steel. A2. 83A2. 83. M 0. R2. 00. 7   LowIntermediate Tensile Strength Carbon Steel Plates. A3. 07 1. 0 Carbon Steel Bolts and Studs, 6. Tensile Strength. A5. 00A5. 00. M 1. Cold Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes. A5. 01 0. 7     Hot Formed Welded and Seamless Carbon Steel Structural Tubing. A9. 92A9. 92. M 0. Structural Steel Shapes. Another well used classfication system youll come across is the SAE AISI code for steel. The xx in the table below represents the carbon content of the metal in hundredths of a percent. The first digit in the number represents the other alloy if any added to the steel. The second digit indicates either the percentage of that alloy, or more alloy additives. You can read a laymans description of the different alloying elements nickel, phosphorus, manganese, etc. Metallurgical Consultants. Stainless Steels. The roster of stainless steel classifications is vast. Fortunately, this metal is easily distinguished from the others, because three digit numbers are used instead of four. Most fall in the 2. As discussed in Visually Identifying Common Metals. The main categories are Austenitic, Martensitic, Ferritic, Precipitation Hardening and Duplex. Stainless steels may also be idenfitied by their chromiumnickel percentages. You see designations like 1. The first number indicates the percentage of chromium added to the steel, the second number the percent nickel. For welders, the most common stainless steel filler rod youll see is 3. L, used on austenitic grades. The L stands for low carbon, which provides greater corrosion resistance. For more on stainless steel filler rods, see TIG Welding Rods. Aluminum. Aluminum stock is classified with four digit numbers, just like steel. The different series e. Like carbon steel, the 1. However, youll notice that the numbering protocol for aluminum then assigns one series per alloy. In steel, multiple alloys may show up in one series. In the 1. For example the classification 1. In all other cases, the three digits after the first number may signify either different properties or other additives to the metal. This will make more sense as you peruse the designations below. For a good discussion of the different alloys and their use, plus more coding specifications, see the tutorial at Alcotec. Heres the general rundown 1xxx Aluminum 9. Ductile, corrosion resistant, weldable but non heat treatable. These alloys are selected primarily for their superior corrosion resistance such as in specialized chemical tanks and piping, or for their excellent electrical conductivity as in bus bar applications. However, they have poor mechanical properties and would seldom be considered for general structural applications. These base alloys are often welded with matching filler material or with 4xxx filler alloys. Aluminum Copper alloys. This is the most common heat treatable alloy. Aluminum copper alloys respond to solution heat treatment. Subsequent aging will increase strength and hardness while decreasing elongation. These metals are often welded with high strength 2xxx series filler alloys, but can sometimes be welded with the 4xxx series fillers containing silicon or silicon and copper, dependent on the application and service requirements. Aluminum Manganese alloys. Manganese increases strength either in solid solution or as a finely precipitated inter metallic phase. It has no adverse effect on corrosion resistance. Aluminum Silicon alloys. Predominantly used as filler material. While silicon is non heat treatable, a number of these alloys have been designed to have additions of magnesium or copper, which provides them with the ability to respond favorably to solution heat treatment. Donde Esta La Papelera De Reciclaje En Windows 7. Typically, these heat treatable filler alloys are used when a welded component is to be subjected to post weld thermal treatments. Aluminum Magnesium alloys. Aluminum magnesium alloys are not heat treatable, and may be strengthened by cold work strain hardening. Effectiveness of cold work hardening increases when magnesium content is increased. The magnesium base alloys are often welded with filler alloys, which are selected after consideration of the magnesium content of the base material, and the application and service conditions of the welded component.