ASTM B Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement. ASTM B Standard Guide for Post-Coating Treatments of Steel for Reducing_ 化学_自然科学_专业资料。后电镀产品处理,降低氢脆的风险标准. Buy ASTM B R GUIDE FOR POST-COATING TREATMENTS STEEL FOR REDUCING THE RISK OF HYDROGEN.
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The hydrogen can be introduced during cleaning, pickling, phosphating, electroplating, autocatalytic processes, porcelain enameling, and in the service environment as a result of cathodic protection reactions or corrosion reactions. It is recommended that the tensile strength be supplied by the purchaser.
ASTM B733 Class 3 post heat treatment vs. ASTM B850 embrittlement relief
Some companies consider the high temperature bake as sufficient to replace the hydrogen embrittlement relief if it can be done within 4 hours, but you would need to check with your customer first before going down that route.
Because of factors such as alloy composition and structure, type of coating, coating thickness, size, mass, or design parameters, some parts may perform satisfactorily with no embrittlement-relief treatment. No further reproductions authorized. Guide ASTM B is a better document to use as a guide to the minimum times for de-embrittlement operations, especially true when you get up the the high tensile strength or very hard materials.
What is the answer to the Heat Treatment vs. This abstract is a brief summary of the referenced standard.
It shall not be applied to steels that may be affected adversely by heat treatment at this temperature, and the lower temperature range shall be applied. For steels of actual tensile strength below MPa, heat treatment after plating is not essential.
ASTM B Standard Guide for Post-Coating Treatments of Steel for Reducing_百度文库
When only the minimum tensile strength is speci? 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.
If I am coating primarily for corrosion protection, I can select a class 3 post heat treatment to improve adhesion and to provide for hydrogen embrittlement relief. I figure that if I ask a plater to plate a part per a specification, the least I can do is read the specification and give them all of the ordering information they need to plate our parts per the specification.
I’m an engineer trying to write good drawing notes for plating requirements. This guide covers the standard procedure sstm performing post-coating heat treatment of some steels for reducing susceptibility to hydrogen embrittlement or degradation that may arise in the finishing processes. NOTE atsm heat treatment does not guarantee complete freedom from the adverse effects of hydrogen degradation.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are xstm provided as part of the standard. Does specifying embrittlement relief baking per Guide B replace Class 3 post heat treatment or should it be specified in addition to Class 3 post heat treatment? NOTE 2—The treatment class selected is based on experience with the part, or similar parts, and the speci?
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. This heat treatment procedure shall be used after plating operations but prior to any secondary conversion coating operation.
Except for surface-hardened and shot-peened parts, the choice of embrittlement-relief heat treatment and the corresponding treatment conditions shall be selected on the basis of actual tensile strength of the steel. Historical Version s – view previous versions of standard.
Which of these would be performed first? All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
No other satm of measurement are included in this standard.
sstm The duration of heat treatment in all cases shall commence from the time at which the whole of each part attains the speci? Per B paragraph 6.
Hydrogen can asttm be introduced during fabrication, for example, during roll forming, machining, and drilling, due to the breakdown of unsuitable lubricants, as well as during welding or brazing operations. Link to Active This link will always route to the current Active version of the standard. For cadmium, tin, zinc, their alloys, or any other coating receiving a chromate treatment, heat treatment shall be conducted before chromate treatment.
A number in parentheses indicates the year of last reapproval.
ASTM B Class 3 post heat treatment vs. ASTM B embrittlement relief
Thanks for your help. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
They sstm not apply to any other standard. If you feel that your comments have not received a fair hearing you should make your views xstm to the ASTM Committee on Standards, at the address shown below. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
So, generally it is hydrogen embrittlement relief bake first and heat treatment second.
While the crystallized chromate coating will provide satisfactory corrosion protection under most natural environments, the chromate coating will no longer pass accelerated corrosion tests.