Is AMS 2700 the same as QQ p35?

QQ-P-35 has been cancelled and superseded by ASTM A967 or AMS-QQ-P-35. AMS-QQ-P-35 has been cancelled and superseded by AMS 2700. Not Specified Use type appropriate for alloy, subject to purchaser acceptance. This document is written in accordance with the requirements of AMS2700.

What is QQ p35?

QQ-P-35C, FEDERAL SPECIFICATION: PASSIVATION TREATMENTS FOR CORROSION-RESISTANT STEEL (28 OCT 1988) [S/S BY ASTM-A967 OR SAE-AMS-QQ-P-35]., This specification covers the different types of passivation treatments, as well as recommendations, guidance, and precautions for cleaning and descaling corrosion-resistant parts.

Is ASTM A967 the same as AMS 2700?

There are other differences- ASTM A967 allows the use of any mix of nitric and water, so long as you show it works (Nitric 5 solution). The ASTM doesn’t default to the nitric acid formulations, as AMS 2700 does. AMS 2700 has an iron concentration maximum, absent from ASTM A 967. AMS 2700 exempts 440C from testing.

What is ASTM A380?

ASTM A380 allows for different types of operations, so long as they are performed to industry standards and create the required finish. This standard specifies different methods for testing the quality of the finish, including wipe tests, high-humidity tests, free iron tests, atomizer tests and more.

Does stainless steel need to be passivated?

In conclusion, passivation of austenitic steel is essential to establish and maintain a uniform chromium oxide film on the stainless steel surface. This is especially true when the metal has been modified during fabrication and system construction. System contamination would also warrant passivation or re-passivation.

What is ASTM A967?

The ASTM A967 passivation standard applies to the cleaning, passivation and testing of stainless steel parts. Chemical passivation removes free iron and other surface contaminants from stainless steel parts, improving corrosion resistance.

Is 316 stainless steel passivated?

What types of stainless steel are compatible with the passivation process? The passivation process includes but is not limited to these types of SST: 303, 304, and 316 alloys. It is typically performed to ASTM A9367 and similar industry specifications for chemical passivation.

What is the difference between pickling and passivation?

Passivation, as the term implies, makes the stainless steel “passive” to corrosion which means building up oxide layer on the surface of the metals. On the other hand, Pickling removes the oxide layers to clean the surface of the metals of any metallic residues.

What is Ferroxyl test?

Ferroxyl test is used on stainless steel to detect iron contamination, including iron-tool marks, residual-iron salts from pickling solutions, iron dust, iron deposits in welds, embedded iron or iron oxide.

What happens if you dont passivate stainless steel?

Passivation cannot make problems associ- ated with lack of a suitable welding purge go away, i.e. severe weld discoloration or sugared welds. Cutting, grinding and mechanical polishing also alters the stainless steel surface and can affect the passive surface.