ASTM A380 PDF
This standard is issued under the fixed designation A; the 1 This practice is under the jurisdiction of ASTM Committee A01 on Steel. A / AM Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Standard + Redline PDF Bundle ASTM License Agreement. Designation: A/AM − Cleaning, Descaling, and Passivation of Stainless Steel. corrosion resistance, or result in the later contamination of the Annex A2 and Part II of the table on acid cleaning of steel.
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Astm apdf - Download as PDF File .pdf), Text File .txt) or read online. ASTM A, test preparations should be available from specialist stainless steel pickling and cleaning product suppliers. Your nearest national stainless steel. ASTM A Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Superseded By: ASTM A/AM PDF + Print. In Stock.
ASTM A380 PASSIVATION DOWNLOAD
Items that are subject to several redraws or a series of safety concerns, if any, associated with its use. It is the hot-forming operations, with intermediate anneals, must be responsibility of the user of this standard to establish appro- cleaned after each forming operation, prior to annealing.
For more specific mersion in, spraying, or swabbing with alkaline or emulsion safety precautions see 7. Referenced Documents 5. Stainless Steel Parts Because mill products are usually supplied in the descaled F21 Test Method for Hydrophobic Surface Films by the condition, descaling except removal of localized scale result- Atomizer Test ing from welding is generally not necessary during fabrication F22 Test Method for Hydrophobic Surface Films by the of equipment or erection of systems see 6.
When Water-Break Test necessary, scale may be removed by one of the chemical 2. Design 5. For Annual Book of ASTM and removes both metallic contamination, and welding and Standards volume information, refer to the standards Document Summary page on heat-treating scales.
Its use should be carefully controlled and the ASTM website. Grind- equipment, and systems. See also A1. Solutions of nitric acid ing is usually the most effective means of removing localized alone are usually not effective for removing heavy oxide scale. Disadvantages 5. When size and shape of product permit, descaling, and the fact that surface defects for example, laps, total immersion in the pickling solution is preferred.
Where pits, slivers may be obscured, making them difficult to detect.
After mechanical descaling, surfaces required chemical treatment. The surface should be kept in should be cleaned by scrubbing with hot water and fiber contact with agitated solution for about 15 to 30 min or until brushes, followed by rinsing with clean, hot water.
Without agitation, additional exposure time may be contain iron, iron oxide, zinc, or other undersirable materials required. If rocking or rotation are impracticable, pickling that may cause contamination of the metal surface.
Grinding solution may be circulated through the item or system until wheels, sanding materials, and wire brushes previously used on inspection shows that descaling has been accomplished. Wire brushes 5. Uniform removal of should be of a stainless steel which is equal in corrosion scale with acid pickling depends on the acid used, acid resistance to the material being worked on.
Continuous exposure to pickling solutions for beads or iron-free silica or alumina sand, are recommended for more than 30 min is not recommended. The item should be abrasive blasting. Steel shot or grit is generally not recom- drained and rinsed after 30 min and examined to check the mended because of the possibility of embedding iron particles. Additional treatment may be The use of stainless steel shot or grit reduces the danger of required.
Most pickling solutions will loosen weld and heat- rusting and iron contamination, but cannot completely elimi- treating scale but may not remove them completely. Intermit- nate the possibility of embedding residues of iron-oxide scale.
Cleaning 5. To minimize the removal of surface contaminants from metals to ensure 1 staining, surfaces must not be permitted to dry between maximum corrosion resistance of the metal; 2 prevention of successive steps of the acid descaling and rinsing procedure, product contamination; and 3 achievement of desired appear- and thorough drying should follow the final water rinse. Cleanness is a perishable condition. Careful planning is Chemical descaling methods, factors in their selection, and necessary to achieve and maintain clean surfaces, especially precautions in their use are described in the Metals Handbook.
Selection of When chemical descaling is necessary, it should be done while cleaning processes is influenced mainly by the type of con- the part is in its simplest possible geometry, before subsequent taminant to be removed, the required degree of cleanness, and fabrication or installation steps create internal crevices or cost.
If careful control of fabrication processes, sequencing of undrainable spaces that may trap descaling agents, sludge, cleaning and fabrication operations, and measures to prevent particles, or contaminated rinse water that might either result in recontamination of cleaned surfaces are exercised, very little eventual corrosion or adversely affect operation of the item special cleaning of the finished item or system may be after it is placed in service.
If there is a question concerning the effectiveness of cleaning agents or 5. Procedural requirements and precautions for using test specimens and sensitive inspection techniques may some of these methods are given in the Metals Handbook.
Descriptions, processes, and precautions to be Mechanical descaling methods have the advantage that they do observed in cleaning are given in the Metals Handbook. For some materials, in particular the austenitic the performance of a part, equipment, or system under service stainless steels when in the sensitized condition and the conditions.
It is recommended that the manufacturer of the martensitic stainless steels when in the hardened condition, cleaner be consulted if there is reason for concern. Water in the degreasing tank or on the item being may be accomplished by immersion in, swabbing with, or cleaned may react with the solvent to form hydrochloric acid, spraying with alkaline, emulsion, solvent, or detergent cleaners which may be harmful to the metal.
No water should be present or a combination of these; by vapor degreasing; by ultrasonics in the degreasing tank or on the item being cleaned. Acids, using various cleaners; by steam, with or without a cleaner; or oxidizing agents, and cyanides must be prevented from con- by high-pressure water-jetting. The cleaning method available taminating the solvent. Materials such as silicones cause at any given time during the fabrication or installation of a foaming at the liquid-vapor interface and may result in component or system is a function of the geometric complexity recontamination of the workpiece as it is removed from the of the item, the type of contamination present, the degree of degreaser.
Vapor degreasing with chlorinated solvents is not cleanliness required, and cost. Methods commonly used for recommended for closed systems or items with internal voids removing deposited contaminants as opposed to scale are or crevices. Cavitation in the use of these methods.
Particular care must be exercised when liquid produced by the high frequency sound causes micro cleaning closed systems and items with crevices or internal agitation of the solvent in even tiny recesses of the workpiece, voids to prevent retention of cleaning solutions and residues.
For extremely semisolid, and solid contaminants from metals. To a great high levels of surface cleanness, high-purity solvents 1 ppm extent the solutions used depend on their detergent qualities for total nonvolatile residue are required. Agitation and temperature of 6. They are effec- deposits and other common contaminants from metals by the tive for softening hard water and in lowering the surface and use of common organic solvents dispersed in an aqueous interfacial tensions of the solutions.
Synthetic detergents, in solution with the aid of a soap or other emulsifying agent an particular, should be checked for the presence of harmful emulsifying agent is one which increases the stability of a ingredients as noted in 6. It is effective for removing 6. They Emulsion cleaning is used when rapid, superficial cleaning is enhance the solubility of scales and certain other contaminants, required and when a light residual film of oil is not objection- do not precipitate different scales when the cleaning solution able.
ASTM A380 Passivation
When properly nants from metal surfaces by immersion or by spraying or used chelating agents must be continuously circulated and swabbing with common organic solvents such as the aliphatic must be maintained within carefully controlled temperature petroleums, chlorinated hydrocarbons, or blends of these two limits , intergranular attack, pitting, and other harmful effects classes of solvents.
Cleaning is usually performed at or slightly are minimal. Chelating agents are particularly useful for above room temperature. Except for parts with extremely cleaning installed equipment and systems. Chlorinated solvents are removing surface contaminants and rust. Cleanliness of abra- not recommended for degreasing of closed systems or items sives and cleaning equipment is extremely important to prevent with crevices or internal voids.
Although sur- 6.
Subsequent effective against oils, waxes, and greases. The cleanness and treatment such as additional iron-free abrasive cleaning chemical stability of the degreasing solvent are critical factors methods, acid cleaning, passivation, or combinations of these in the efficiency of the vapor and possible chemical attack of is, therefore, required for stainless steel parts, equipment, and systems to be used where corrosion resistance is a prime factor to satisfy performance and service requirements, or where 5 product contamination must be avoided.
It may be used with cleaning agents such as 6.
Steam lances are has been taken in earlier fabrication and cleaning, final frequently used for cleaning piping assemblies. Steam pres- cleaning may consist of little more than scrubbing with hot sures from to kPa [50 to 75 psi] are usually adequate water or hot water and detergent such as trisodium phosphate, see 6.
More A Consideration shall be given in the design of parts, equipment, and systems that will require cleaning to minimize the presence of areas in which dirt, or cleaning solutions might become trapped, and to provide for effective circulation and removal of cleaning solutions.
Materials shall be precleaned.
Scales shall be removed through chemical descaling, acid pickling, and mechanical descaling. Degreasing and general cleaning shall be accomplished by immersion in, swabbing with, or spraying with alkaline, emulsion, chelate, acid, solvent, or detergent cleaners or a combination of these; by vapor degreasing; by ultrasonics using various cleaners; by steam, with or without a cleaner; or by high-pressure water-jetting.
Recommended cleaning practices shall be followed for welds and weld-joint areas, specially critical applications, installed systems and post-erections.
The following shall be used as the basis for cleanness acceptability: Visual inspection; wipe tests; residual pattern; water-break test; free iron test such as water-wetting or drying; high-humidity test; and copper sulfate test. Precision inspection shall be performed by solvent-ring test, black light inspection, atomizer test, and ferroxyl test. Precaution shall always be practiced to minimize iron contamination, in reuse of cleaning and pickling solution, in water rinsing, in circulation of cleaning solutions and rinse water, in protection of cleaned surfaces, for safety, and disposal of used solutions and water.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Scope 1.
Degreasing and general cleaning shall be accomplished by immersion in, swabbing with, or spraying with alkaline, emulsion, chelate, acid, solvent, or detergent cleaners or a combination of these; by vapor degreasing; by ultrasonics using various cleaners; by steam, with or without a cleaner; or by high-pressure water-jetting.
This ASTM also deals 3a80 the pre-cleaning stage which can astm a passivation done with pickling, ultrasonics and degreasing. This process is described in a general way in 6. To my knowledge it is not possible to do a combination pickling and passivation.
There are better formulations for doing astm a passivation you want, however, that are available on a proprietary basis. Astm a passivation to Active This link will always route to the current Active version of the standard. Referenced Documents purchase separately The paszivation listed below are referenced within the astm a passivation standard but are not provided as part of the standard.
Passivarion standard covers both nitric and citric acid passivatiom. Methods are described for the detection of free iron and transparent chemical and a deposits. Passivation of stainless steels Introduction Stainless steels are designed to naturally self-passivate whenever a clean surface is exposed to an environment that astm a passivation provide enough oxygen to form the chromium rich oxide surface layer, on which the corrosion resistance of these alloys depends.
At Classic Electropolishing quality finishing and polishing passiavtion paramount, both to us and to our customers. This process greatly reduces the formation rust on the surface of the workpiece. It therefore in no way precludes the necessity for careful planning and judgment in the selection and implementation of such procedures. Specific treatments are however also specified. ASTM A deals with the standards for cleaning, descaling, and passivation of stainless steel parts, equipment, and systems.
Standard Practice for
Citric acid passivation as an alternative to nitric acid treatments Citric acid treatments can also be considered as an alternative to nitric acid as both provide the oxidising conditions astm a passivation for astm a passivation.The presence of a smudge under clean-room conditions.
Chelating agents are particularly useful for above room temperature. F For reasons of convenience and handling safety. For certain exceptional 1. Originally 1. Cleaning by mechanical methods or other chemical ance of parts. Waqas Waqas. For inaccessible areas.
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