Subscribers can view annotate, and download all of SAE's content. View Details. Coating, Cadmium Vacuum Deposited. This specification covers the requirements for heat-treatment of four classes of steel see 1. It is applicable to all heat treatment of parts and to only the heat treatment of mill products which could affect its fabricability or the properties of parts.
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This speclflcatlon is approved for use by all Departments and Agencies of the Department of Defense. This spec! It is applicable. Unless otherwise speclfled, this specification is not. Processes not covered Include deliberate surface heat-treating and spectaltzed heat-treating, such as induction hardening, flame hardening, carburizlng, nltriding; however, this specification may be referenced for equipment and controls. Austemperlng, ausbay quenching and martemperlng may be used when specified by the cognizant engtneer!
Steels covered by this specification are classified. Unless otherwise specified, the process and. C l a s s A - Carbon and low alloy steel C l a s s B - Martensltic corrosion-resistant steel C l a s s C - Austenitlc corrosion-resistant steel C l a s s D - Prectpitatlon-hardening and maraging steel.
The followlng spec. Nickel Plating Electroplated. Unless otherwise speclfled, the. U n l e s s otherwise speclfled, the Issues of. Attack In Austenltlc. Stainless Steels. Mechanical Testing of Steel Products, Methods and. Definitions for. ASTM C ASTM D -. Ceramic Nhltewares by Resonance, Test Method for. ASTM E. ASTM E Metallic Materials.
Appllcatlon for copies should be addressed to the Amer can Society for. Testing and Materla. MIS Copper Plating. AMS These documents also may be available In or through Ilbrarles or other Informational services. In the event of a confllct between. Nothing in this specification, however, supersedes applicable laws and regulations unless a speclflc exemption has been obtained.
The gaseous. Argon jl. Atmosphere shall be refined or blended content at the surface of the material. Exothermlc atmosphere permissible only for heat treatment of class A mill products.
A product. Nitrogen atmosphere does not include nitrogen from dissociated ammonia. Only acceptable when tempered at oF or above. Acceptable for annealing. Class A steels may be fine grain copper plated 0.
Other supplementary protective coatings may be used If approved by the cognizant engineering organization. Permissible only for anneallng of mill products providing residual ammonia at the outlet of the generator does not exceed 15 ppm.
Furnaces for mill products shall be. Furnaces, gases, and. A l l atmosphere furnaces and gas supply lines shall be purged w!
Ducts and working zones shall be sealed to. Salt baths shall be tested. Inltlally and at least once. The design and construction of heat! The set temperature on the. The temperature of the mill product shall not exceed.
In continuous furnaces used to anneal and normalize mill products, a. The requirements and. Equipment which cannot be controlled and tested in accordance with AMS shall be controlled and tested as directed by the cognizant.
Quenching equipment. Quench baths. Quench baths shall permit complete Immersion of. Baths shall be adequate to produce the requfred properties In the most massive material to be quenched. The temperature of the oil quenching media shall not exceed the manufacturers recommended operating range. Quench oil useo in integrai quench vacuum furnace systems, where the quench chamber Is below atmospheric pressure, shall be vacuum degassed at approximately the maximum recommended temperature for the quenchant Initially and after each major addition of oil.
Aqueous polymer quenchants may be The temperature of the aqueous. Hater-quenching baths employed. Polymer quenching baths when used in conjunction w! All salt residues shall be removed.
In lieu of the stated methods in Tables. IA through ID, steam, air ,water sprays, inert gases, polymers, molten salts or. Equivalence tests shall be as spec! IA-ID, argon and hellum may be used; other Inert gases. Suitable jigs, fixtures, trays, hangers,. Equipment shall be provided to clean material In. Hhere toxic or harmful cleaners are employed, they shall be used In compliance with the applicable health and safety regulations. Heating rates shall be controlled to prevent damage.
Has been previously hardened above Rc 35, or IS made of steel of 0. Has abrupt changes of section, or sharp re-entrant angles, or. Hds been finish machined,. Hardening of Classes A and B material. Classes A and B matertal. H-II parts shall be In the annealed condltlon,.
Parts made of or steel. Parts made from other Class A steels to be. Parts that have been welded shall be normalized, prior. The austen! The recommended holding times at temperature are. Parts shall be held within the speclfled. Material shall be quenched from the austenitizing. Material shall be cooled to or below the quenchant temperature before t e m p e r i n g. Material should be tempered within two hours after quench or within.
They shall be cooled sufficiently and tempered within a period of time adequate to prevent quench cracking or conditions deleterious to end product mechanical properties and corrosion resistance. Material shall be tempered In accordance with Table. Class D steel parts shall be hardened by. Class D material is normally acquired in the solutlon treated or solutlon treated and cold worked I. The aging temperature In Table ID may be adjusted higher to meet the specified tensile strength.
Other thermal treatment. Normalizing applicable to Class A steel only. Normalizing shall. The recommended minimum holdlng times at. Anneallng full annealing of.
Annealing of Class C material shall be. Stress relieving before hardening of Class A.
Subscribers can view annotate, and download all of SAE's content. Steel, Bars, Forgings, and Tubing 1. View Details. This specification covers the requirements for heat-treatment of four classes of steel See 1.
MIL-H-6875H Heat Treatment of Steel, Process for (SS by SAE-AMS-H-6875)