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Designation Of Stainless Steels



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ASTM Stainless Steel Pipe available in diversity of sizes in Big stock, we deliver ASTM Stainless Steel Pipe with Exceptional sizes & Quality.

Rythme Alloys is the most acclaimed manufacturer, exporter, distributor and supplier of industrial ASTM Stainless Steel Pipe with required test certificates. You can also Order small quantities, we will be happy to quote best price for small and large quantities & can typically deliver the ASTM Stainless Steel Pipe in minimum time frame anywhere around the globe. Our broad product range makes your individual wishes possible and also meets the extraordinary demands.

Structure Hardenable Group AISI Type Analyses Built Up From Basic Types
Austenitic Hardenable by Cold Work Chromium-Nickel Manganese 201 Cr and Ni lower for more work hardening
202 Basic Type ó Cr 18% ó Ni 5% ó Mn 8%
204 C lower to avoid carbide precipitation
204L C lower for welding application
Austenitic Hardenable by Cold Work Chromium-Nickel 301 Cr and Ni lower for more work hardening
302 Basic Type ó Cr 18% ó Ni 8%
302B Si higher for more scaling resistance
303 S or Se added for easier machining
304 C lower to avoid carbide precipitation
304L C lower for welding application
305 Ni higher for less work hardening
308 Cr and Ni higher with C low for more corrosion and scaling resistance
309 Cr and Ni still higher for more corrosion and scaling resistance
309C Cb, Ta added to avoid carbide precipitation
309S C lower to avoid carbide precipitation
310 Cr and Ni highest to increase scaling resistance
314 Si higher to increase scaling resistance
316 Mo added for more corrosion resistance
316L C lower for welding application
317 Mo higher for more corrosion resistance and strength at heat
318 Cb, Ta added to avoid carbide precipitation
321 Ti added to avoid carbide precipitation
347 Cb, Ta added to avoid carbide precipitation
347F or Se S or Se added to improve machinability
348 Similar to 347, but low tantalum content (.10)
Martensitic Hardenable by Heat Treatment Chromium-Iron 403 Cr 12% adjusted for special physicals
410 Basic Type – Cr 12%
414 Ni added to increase corrosion resistance and physicals.
416 S or Se added for easier machining
418 Spec W added to improve high temperature properties
420 C higher for cutting purposes
420F or Se S or Se added for easier machining
431 Cr higher and Ni added for better resistance and properties
440A C higher for cutting applications
440B C higher for cutting applications
440C C still higher for wear resistance
440F or Se S or Se added for easier machining
Ferritic Non-hardenable Chromium-Iron 405 Al added to Cr l2% prevent hardening
430 Basic Type ó Cr 17%
430F or So S or Se added for easier machining
430Ti Titanium stabilized
442 Cr higher to increase scaling resistance
446 Cr much higher for improved scaling resistance
Alloy Abreviations
Carbon . . . . . . . . . . C Molybdenum . . . . . . Mo Sulfur . . . . . . . . . . . S
Nickel . . . . . . . . . . Ni Chromium . . . . . . . . . Cr Titanium . . . . . . . . . Ti
Columbium . . . . . . Cb Phosphorous . . . . . . . . P Tantalum . . . . . . . . Ta
Manganese . . . . . . Mn Selenium . . . . . . . . . . Se Tungsten . . . . . . . . W
Silicon . . . . . . . . . . Si    

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.

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