Ratings of chemical behavior listed in this chart apply at a 48hr exposure period. Stainless steel chemical composition, chemical composition. General use material grades are tp304304l, tp316316l. Some scrap is produced, which is directly reused in the melting shop. Typical of this group is type 304, also widely known as 188 stainless, a generalpurpose stainless steel.
Astm a312 stainless steel pipe specification standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes astm a312 pipe is common use stainless pipe for industries. Well known stainless steel grade, very close to the 201 grade but with lower mechanical properties. Thermal treatments surface treatments fabrication characteristics welding, brazing and soldering general characteristics chemical composition physical properties mechanical properties. Weldability issue of aisi 202 ss stainless steel grade with. It is the most versatile and most widely used stainless steel available, even though a wide range of alternatives are available. Grade 309 stainless steel has high corrosion resistance and strength compared to 304 stainless steel. It has been written primarily from a european perspective and may not fully reflect the practice in other regions.
Most astm and asme standards list the steel grades by their uns unified numbering system numbers but also make reference, where appropriate to the more general aisi american iron and steel institute grade designations. Ss 304 is a stainless steel with applications ranging from the manufacturing of chemical equipment, kitchen and cooking utensils and equipment, to surgical tools and textile dyeing equipment. It is still sometimes referred to by its old name 188 which is derived from the nominal composition of type 304 being 18% chromium and 8% nickel. Crack propagation behavior in type 304 stainless steel. Weldability issue of aisi 202 ss stainless steel grade. It covers diameters from 18 to 30 and thickness from sch 10s to sch 80s. Approximate concentrations for industrial hygiene purposes ingredients cas number percent permissable exposure limit pel osha threshold limit value tlv acgih iron 7439896 45 70 % 10 mgm 3 5 mgm 3. The following datasheet gives an overview of grade 309 stainless steel.
But it is very inexpensive so we can use it in indoor applications like indoor fabrication. Aisi 202 ss stainless steel has similar mechanical property as compare to aisi 304 ss grade, but its ability to resist corrosion is somewhat less as compare to aisi 304 ss grade in chloride environment. Types 302 s30200, 304s30400, 304l s30403, and 305 s30500 stainless steels are variations of the 18 percent chromium 8 percent nickel austenitic alloy, the most familiar and most frequently used alloy in the stainless steel family. Other special requests about specification,please contact us. The stainless steel family a short description of the various grades of stainless steel and how they fit into distinct metallurgical families. Ak steel produces type 430 stainless steel in coils and cut lengths in thicknesses 0. Microsoft word msds 304 304l stainless steel xylem.
In some instances type 304 can be used in the aswelded condition. Well known stainless steel as well, with very high corrosion resistance, it is usually reserved to very aggressive. The asquenched structure of fresh martensite must be. High ductility, excellent drawing, forming, and spinning properties. For some high strength cold headed fasteners a slightly higher work hardening rate will be needed, so grade 304 or 304l or the specialist grade 304m will need. The 188 stainless steels, principally types 304 and. They apply to all wrought product forms including ingots and semifinished material. Ss 304 is considered the basic stainless steel alloy, composed of 18% chromium and 8% nickel. Tjc stainless is the most competitive manufacture and supplier of 204 stainless steel in thickness 0. Otherwise referred to as grade 304 or type 304, it is the most commonly utilized grade of stainless. As will be shown, stainless steel is sometimes the only material that can be used. Type 304 stainless steel is the most versatile and one of the most widely applied of the 300 series stainless steels.
When it comes to variations between 304 and 304l stainless steel, the most essential thing to note is the latters greater immunity to intergranular corrosion. Values shown in this bulletin were established in u. Table 1 chemical composition of base and filler metals used in this study wt. Kad group of companies provide stainless steel chemical composition table chart. Download generated pdf file 1mb view forta range datasheet. The role stainless steel in industrial heat exchangers. The selection of the appropriate stainless steel grade for each applic ation is the result of variou s considerations. This makeup ensures that ss 304 has a wellbalanced. The molybdenum allows ss 316 to be more resistance to corrosion overall, with specific resistance against chlorine pitting. The following table shows the chemical composition of grade 309 stainless steel.
Type 316 stainless steel in an environment of 25% phosphoric acid, and figure 3 shows effects of temperature on types 304 and 316 in very concentrated sulfuric acid. Type 304 stainless steel is a variation of the base 188 grade, with a higher. Stainless steel is the term used to describe an extremely versatile family of. Intergranular corrosion is the cracking that can occur along grain boundaries of steel in the presence of tensile stress. Type 304 is the most versatile and widely used stainless steel. The stainless steel alloys shown in the table on page 3 were heated as sheet samples for 60 minutes per inch of thickness at 1800f 982c for type 410 and at 1900f 1038c for types 420, 425 modified, and 440a, and then air cooled to room temperature. The selection of the appropriate stainless steel grade for each application is the result of various considerations. Stainless steel 316 is a chromiumnickel based steel that possesses increased levels of resistance against several substances, due to the addition of molybdenum in its composition. Table 1 stainless steel properties chemical analysis % max unless noted otherwise 304 s30400 304l s30403 309s. The remainder of its composition is made up of carbon, manganese, silicon and very small amounts of phosphorous and sulfur.
Sus329j1 denotes austenitic and ferritic stainless steel. It has excellent forming and welding characteristics. The carefully controlled analysis of type 304 enables it to be deep drawn more severely than types 301 and 302 without intermediate softening. The next step is the production of hotrolled and coldfinished steel products in steel mills. High strength, excellent corrosion resistance and excellent formability make. Stainless 302, 304, 304l, 305 united performance metals. The balanced austenitic structure of grade 304 enables it to be severely deep drawn without intermediate annealing. Please contact us for mechanical properties if en, astm, or aisi specification is. Types 316 uns s31600, 316ls31603, 317 s31700, and 317l s31703 are molybdenum bearing austenitic stainless steels which are more resistant to general corrosion and pittingcrevice corrosion than the conventional chromiumnickel austenitic stainless steels such as type 304. The grade 304 l is preferably used for welded constructions as this low carbon grade will not be sensitized. The lower carbon content minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion.
Its high chromium and nickel contents provide comparable corrosion resistance, superior resistance to oxidation and the retention of a larger fraction of room. Service tests are most reliable in determining optimum material, and astm g4 is a recommended practice for carrying out such tests. Where high strength is required at temperatures above 500c and up to 800c grade 304h is recommended. Oct 23, 2001 grade 304 is a standard 188 stainless. Chemical composition of stainless steels flat products. These components also give cause for 304 to be referred to as 188. The stainless steel cycle starts with carbon steel scrap, primary metals, and slag. Reference is often made to stainless steel in the singular sense as if it were one material. Type 304 has slightly lower strength than 302 due to its lower carbon content.
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