ASTM B850-98(2015)

Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement

ABSTRACT
This guide covers the standard procedure of performing post-coating heat treatment of some steels for reducing susceptibility to hydrogen embrittlement or degradation that may arise in the finishing processes. 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.
SCOPE
1.1 This guide covers procedures for reducing the susceptibility in some steels to hydrogen embrittlement or degradation that may arise in the finishing processes.  
1.2 The heat treatment procedures established herein may be effective for reducing susceptibility to hydrogen embrittlement. This heat-treatment procedure shall be used after plating operations but prior to any secondary conversion coating operation.  
1.3 This guide has been coordinated with ISO/DIS 9588 and is technically equivalent.  
Note 1: The heat treatment does not guarantee complete freedom from the adverse effects of hydrogen degradation.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-2014
• ICS: 77.080.01 - Ferrous metals in general
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.02 - Pre Treatment

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B850 − 98 (Reapproved 2015)
Standard Guide for
Post-Coating Treatments of Steel for Reducing the Risk of
1
Hydrogen Embrittlement
This standard is issued under the fixed designation B850; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
When atomic hydrogen enters steel, it can cause a loss of ductility, load carrying ability, or cracking
(usually as submicroscopic cracks), as well as catastrophic brittle failures at applied stresses well
below the yield strength or even the normal design strength for the alloys. This phenomenon often
occurs in alloys that show no significant loss in ductility, when measured by conventional tensile tests,
and is referred to frequently as hydrogen-induced delayed brittle failure, hydrogen stress cracking, or
hydrogen embrittlement. 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. Hydrogen can also 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.
1. Scope 2. Referenced Documents
2
1.1 This guide covers procedures for reducing the suscep- 2.1 ASTM Standards:
tibility in some steels to hydrogen embrittlement or degrada- A919 Terminology Relating to Heat Treatment of Metals
3
tion that may arise in the finishing processes. (Withdrawn 1999)
B374 Terminology Relating to Electroplating
1.2 The heat treatment procedures established herein may
B851 Specification for Automated Controlled Shot Peening
be effective for reducing susceptibility to hydrogen embrittle-
of Metallic Articles Prior to Nickel, Autocatalytic Nickel,
ment. This heat-treatment procedure shall be used after plating
or Chromium Plating, or as Final Finish
operations but prior to any secondary conversion coating
2.2 ISO Standards:
operation.
ISO 2080 Electroplating and Related Processes—
1.3 ThisguidehasbeencoordinatedwithISO/DIS9588and
4
Vocabulary
is technically equivalent.
ISO DIS 9588 Post-Coating Treatments of Iron or Steel for
4
NOTE1—Theheattreatmentdoesnotguaranteecompletefreedomfrom
Reducing the Risk of Hydrogen Embrittlement
the adverse effects of hydrogen degradation.
2.3 Federal Standard:
5
1.4 The values stated in SI units are to be regarded as QQ-C-320 Chromium Plating (Electrodeposited)
standard. No other units of measurement are included in this
3. Terminology
standard.
1.5 This standard does not purport to address all of the
3.1 Definitions—Manyofthetermsusedinthisguidecanbe
safety concerns, if any, associated with its use. It is the
found in Terminology B374, A919, or ISO 2080.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
2
bility of regulatory limitations prior to use.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1 3
This specification is under the jurisdiction of ASTM Committee B08 on The last approved version of this historical standard is referenced on
Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee www.astm.org.
4
B08.02 on Pre Treatment. Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved Jan. 1, 2015. Published January 2015. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
5
approved in 1994. Last previous edition approved in 2009 as B850–98(2009). DOI: Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
10.1520/B0850-98R15. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B850 − 98 (2015)
4. Requirements in the purchaser’s interest that his or her part designer,
manufacturing engineer, or other technically qualified indi-
4.1 Heat treatment may be performed on coated metals to
vidual specify the treatment class on the part drawing or
reduce the risk of hydrogen embrittlement. The duration of
purchase order.
heat treatment in all cases shall commence from the time at
which the whole of each part attains the specified temperature.
5. Embrittlement Relief Treatment Classes
4.2 Parts
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B850 − 98 (Reapproved 2009) B850 − 98 (Reapproved 2015)
Standard Guide for
Post-Coating Treatments of Steel for Reducing the Risk of
1
Hydrogen Embrittlement
This standard is issued under the fixed designation B850; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
When atomic hydrogen enters steel, it can cause a loss of ductility, load carrying ability, or cracking
(usually as submicroscopic cracks), as well as catastrophic brittle failures at applied stresses well
below the yield strength or even the normal design strength for the alloys. This phenomenon often
occurs in alloys that show no significant loss in ductility, when measured by conventional tensile tests,
and is referred to frequently as hydrogen-induced delayed brittle failure, hydrogen stress cracking, or
hydrogen embrittlement. 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. Hydrogen can also 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.
1. Scope
1.1 This guide covers procedures for reducing the susceptibility in some steels to hydrogen embrittlement or degradation that
may arise in the finishing processes.
1.2 The heat treatment procedures established herein may be effective for reducing susceptibility to hydrogen embrittlement.
This heat-treatment procedure shall be used after plating operations but prior to any secondary conversion coating operation.
1.3 This guide has been coordinated with ISO/DIS 9588 and is technically equivalent.
NOTE 1—The heat treatment does not guarantee complete freedom from the adverse effects of hydrogen degradation.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
3
A919 Terminology Relating to Heat Treatment of Metals (Withdrawn 1999)
B374 Terminology Relating to Electroplating
B851 Specification for Automated Controlled Shot Peening of Metallic Articles Prior to Nickel, Autocatalytic Nickel, or
Chromium Plating, or as Final Finish
2.2 ISO Standards:
4
ISO 2080 Electroplating and Related Processes—Vocabulary
4
ISO DIS 9588 Post-Coating Treatments of Iron or Steel for Reducing the Risk of Hydrogen Embrittlement
1
This specification is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.02 on Pre
Treatment.
Current edition approved Sept. 1, 2009Jan. 1, 2015. Published December 2009January 2015. Originally approved in 1994. Last previous edition approved in 20042009
as B850–98(2004).B850–98(2009). DOI: 10.1520/B0850-98R09.10.1520/B0850-98R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B850 − 98 (2015)
2.3 Federal Standard:
5
QQ-C-320 Chromium Plating (Electrodeposited)
3. Terminology
3.1 Definitions—Many of the terms used in this guide can be found in Terminology B374, A919, or ISO 2080.
4. Requirements
4.1 Heat treatment may be performed on coated metals to reduce the risk of hydrogen embrittlement. The duration of heat
treatment in all cases shall commence from the time at which the whole of each part attains the specified t
...