Machinery's Handbook, 31st Edition
416 Alloy Steels SAE 30316: Recommended for use in parts where unusual resistance to chemical or salt water corrosion is necessary. It has superior creep strength at elevated temperatures. SAE 30317: Similar to SAE 30316 but has the highest corrosion resistance of all these alloys in many environments. SAE 30321: Recommended for use in the manufacture of welded structures where heat treatment after welding is not feasible. It is also recommended for use where temperatures up to 1600 ° F (870 ° C) are encountered in service. SAE 30325: Used for such parts as heat control shafts. SAE 30347: This steel is similar to SAE 30321. This niobium alloy is sometimes pre ferred to titanium because niobium is less likely to be lost in welding operations. Stainless Chromium Irons and Steels.— SAE 51409: An 11 percent chromium alloy developed especially for automotive mufflers and tailpipes. Resistance to corrosion and oxidation is very similar to SAE 51410. It is nonhardenable and has good forming and welding characteristics. This alloy is recommended for mildly corrosive applications where surface appearance is not critical. SAE 51410: A general-purpose stainless steel capable of heat treatment to show good physical properties. It is used for general stainless applications, both in the annealed and heat-treated condition, but is not as resistant to corrosion as SAE 51430 in either the an- nealed or heat-treated condition. SAE 51414: A corrosion and heat-resisting nickel-bearing chromium steel with some what better corrosion resistance than SAE 51410. It will attain slightly higher mechanical properties when heat treated than SAE 51410. It is used in the form of tempered strip or wire, and in bars and forgings for heat-treated parts. SAE 51416F: A free-machining grade for the manufacture of parts produced in auto matic screw machines. SAE 51420: This steel is heat-treatable to a relatively high hardness. It will harden to a maximum of approximately 500 BHN (Brinell Hardness Number). Maximum corro- sion-resisting qualities exist only in the fully hardened condition. It is used for cutlery, hardened pump shafts, etc. SAE 51420F: This is similar to SAE 51420 except for its free-machining properties. SAE 51430: This high-chromium steel is not capable of heat treatment and is recom mended for use in shallow parts requiring moderate draw. Corrosion and heat resistance are superior to SAE 51410. SAE 51430F: This steel is similar to SAE 51430 except for its free-machining properties. SAE 51431: This nickel-bearing chromium steel is designed for heat treatment to high mechanical properties. Its corrosion resistance is superior to other hardenable steels. SAE 51440A: A hardenable chromium steel with greater quenched hardness than SAE 51420 and greater toughness than SAE 51440B and 51440C. Maximum corrosion resis tance is obtained in the fully hardened and polished condition. SAE 51440B: A hardenable chromium steel with greater quenched hardness than SAE 51440A. Maximum corrosion resistance is obtained in the fully hardened and polished condition. Capable of hardening to 50–60 RC (Rockwell C scale) depending on carbon content. SAE 51440C: This steel has the greatest quenched hardness and wear resistance on heat treatment of any corrosion- or heat-resistant steel. SAE 51440F: The same as SAE 51440C, except for its free-machining characteristics. SAE 51442: A corrosion- and heat-resisting chromium steel with corrosion-resisting properties slightly better than SAE 51430 and with good scale resistance up to 1600 ° F (870 ° C). SAE 51446: A corrosion- and heat-resisting steel with maximum amount of chromium consistent with commercial malleability. Used principally for parts that must resist high temperatures in service without scaling. Resists oxidation up to 2000 ° F (1095 ° C). SAE 51501: Used for its heat and corrosion resistance and good mechanical properties at temperatures up to approximately 1000 ° F (540 ° C).
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