Resistance steels

Steels iu the AISI 400 series contain a minimum of 11.5% chromium and usually not more than 2.5% of any other aHoyiag element these steels are either hardenable (martensitic) or nonhardenable, depending principally on chromium content. Whereas these steels resist oxidation up to temperatures as high as 1150°C, they are not particularly strong above 700°C. Steels iu the AISI 300 series contain a minimum of 16% chromium and 6% nickel the relative amounts of these elements are balanced to give an austenitic stmcture. These steels caimot be strengthened by heat treatment, but can be strain-hardened by cold work. 

These steels resist oxidation scaling up to 825°C but are difficult to weld and, thus, are used mainly for items that do not involve welded joints [17]. They are thermally hardened and useful for items that require cutting edges and abrasion resistance in mildly corrosive situations. However, they should not be tempered in the temperature range of 450 to 650°C. This reduces the hardness and wear resistance and also lowers the corrosion resistance because of the depletion of chromium in solution through the formation of chromium carbides. 

S = Safety what are the consequences of failure If they are serious, a more resistant material than usual may be justified. For example, on a plant where leaking v. ater would react violently with process materials, the water lines were made from a grade of steel resistant to stress corrosion cracking (from the chloride in the cooling water) as well as rust. 

Notwithstanding possible explanations of the effects of these various alloying elements, perhaps the most important message arising from the effects reflected in equations (8.11). (8.12) and (8.13) is that the effects of alloying elements vary with the environment. It follows that a steel resistant to cracking in one environment may not be resistant in others, with the effect... 

Austenitic stainless steels resist corrosion at levels of chloride contamination greater than that which can be resisted by epoxy-coated bar. 

L. I. Class, Present State of Knowledge in Respect to the Properties of Steels Resistant to Hydrogen Under Pressure, Stahl and Eisen, August 18, 1960, Vol. 80, pp. 1117-1135. 

I45. Parrini, C. DeVito, A. "High Strength Microalloyed Pipe Steels Resistant to P ydrogen-Induced Failures", Presented at Micon 78 Conf., Houston, Texas, April 3-5, 1978, Private Publ. by Italsider, Taranto, Italy, also, ASTM book STP 672, Baltimore,... 

Chemical steel resist) 18-8 Mo Nickel Monel brass num glass bate) veg) [Lucite (Saran) materials... 

Lake, T., 1990, Duplex steels resist corrosion in heat transfer. Proc. Ind. J. July 15 -17. 

Polyester polyol blocked Blend coating applied on steel Resistant to acids, methyl Maruyama and... 

Austenitic stainless steels resist oxidation by either oxygen-bearing or sulfur-bearing process streams. Austenitic stainless steel pipe is not foolproof simply because it has corrosion resistance. Many plant operators are too optimistic, feeling that tight temperature controls are unnecessary with austenitic stainless steels. If... 

Pure iron ordinarily rusts quickly, but steel does not corrode nearly as fast. How does steel resist corrosion ... 

In alloyed air-hardened steels (13 CrMo44), thorough tempering at 750°C is needed after welding to eliminate the hardness structure. Only when the hardness is below 220V are these steels resistant to stress corrosion cracking. 

Shock-resisting tool steels S Shock-resistant tool steels, with Cr-W, Sl-Mo, and Sl-Mn as major alloys, are strong and tough, but they are not as wear resistant as many other tool steels. These steels resist sudden and repeated loadings. Apphcatlons include pneumatic tooling parts, chisels, punches, shear blades, bolts, and springs... 

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