ASTM B850-98(2004)

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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2004
• ICS: 77.080.01 - Ferrous metals in general
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.02 - Pre Treatment

Relations

• Replaces: ASTM B850-98 - Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement
• Effective Date: 01-Apr-2004
• Replaced By: ASTM B850-98(2009) - Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement
• Effective Date: 01-Sep-2009
• Referred By: ASTM B605-22 - Standard Specification for Electrodeposited Coatings of Tin-Nickel Alloy
• Effective Date: 01-Apr-2004
• Referred By: ASTM B242-99(2020) - Standard Guide for Preparation of High-Carbon Steel for Electroplating
• Effective Date: 01-Apr-2004
• Referred By: ASTM B867-95(2018) - Standard Specification for Electrodeposited Coatings of Palladium-Nickel for Engineering Use
• Effective Date: 01-Apr-2004
• Referred By: ASTM B999-15(2022) - Standard Specification for Titanium and Titanium Alloys Plating, Electrodeposited Coatings of Titanium and Titanium Alloys on Conductive and Non-Conductive Substrate
• Effective Date: 01-Apr-2004
• Referred By: ASTM B842-23 - Standard Specification for Electrodeposited Coatings of Zinc Iron Alloy Deposits
• Effective Date: 01-Apr-2004
• Referred By: ASTM B545-22 - Standard Specification for Electrodeposited Coatings of Tin
• Effective Date: 01-Apr-2004
• Referred By: ASTM B177/B177M-11(2021) - Standard Guide for Engineering Chromium Electroplating
• Effective Date: 01-Apr-2004
• Referred By: ASTM B700-20 - Standard Specification for Electrodeposited Coatings of Silver for Engineering Use
• Effective Date: 01-Apr-2004
• Referred By: ASTM B840-22 - Standard Specification for Electrodeposited Coatings of Zinc Cobalt Alloy Deposits
• Effective Date: 01-Apr-2004
• Referred By: ASTM B579-22 - Standard Specification for Electrodeposited Coatings of Tin-Lead Alloy (Solder Plate)
• Effective Date: 01-Apr-2004
• Referred By: ASTM B200-22 - Standard Specification for Electrodeposited Coatings of Lead and Lead-Tin Alloys on Steel and Ferrous Alloys
• Effective Date: 01-Apr-2004
• Referred By: ASTM B633-23 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
• Effective Date: 01-Apr-2004
• Referred By: ASTM B734-97(2018) - Standard Specification for Electrodeposited Copper for Engineering Uses
• Effective Date: 01-Apr-2004

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 2004)
Standard Guide for
Post-Coating Treatments of Steel for Reducing the Risk of
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 of Metallic Articles Prior to Nickel, Autocatalytic Nickel,
or Chromium Plating, or as Final Finish
1.1 This guide covers procedures for reducing the suscep-
2.2 ISO Standards:
tibility in some steels to hydrogen embrittlement or degrada-
ISO 2080 Electroplating and Related Processes—
tion that may arise in the finishing processes.
Vocabulary
1.2 The heat treatment procedures established herein may
ISO DIS 9588 Post-Coating Treatments of Iron or Steel for
be effective for reducing susceptibility to hydrogen embrittle-
Reducing the Risk of Hydrogen Embrittlement
ment. This heat-treatment procedure shall be used after plating
2.3 Federal Standard:
operations but prior to any secondary conversion coating
QQ-C-320 Chromium Plating (Electrodeposited)
operation.
1.3 ThisguidehasbeencoordinatedwithISO/DIS9588and
3. Terminology
is technically equivalent.
3.1 Definitions—Many of the terms used in this guide can
NOTE 1—The heat treatment does not guarantee complete freedom
be found in Terminology B374, A919,or ISO 2080.
from the adverse effects of hydrogen degradation.
4. Requirements
2. Referenced Documents
4.1 Heat treatment may be performed on coated metals to
2.1 ASTM Standards:
reduce the risk of hydrogen embrittlement. The duration of
A919 Terminology Relating to Heat Treatment of Metals
heat treatment in all cases shall commence from the time at
B374 Terminology Relating to Electroplating
which the whole of each part attains the specified temperature.
B851 Specification forAutomated Controlled Shot Peening
4.2 Parts made from steel with actual tensile strengths
$1000 MPa (with corresponding hardness values of 300
HV , 303 HB, or 31 HR ) and surface-hardened parts may
10kgf C
This specification is under the jurisdiction of ASTM Committee B08 on
require heat treatment unless Class ER-0 is specified. Prepara-
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
tion involving cathodic treatments in alkaline or acid solutions
B08.02 on Pre Treatment.
shall be avoided. Additionally, the selection of electroplating
Current edition approved April 1, 2004. Published April 2004. Originally
approved in 1994. Last previous edition approved in 1998 as B850–98. DOI:
10.1520/B0850-98R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
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B850–98 (2004)
solutions with high cathodic efficiencies is recommended for 5. Embrittlement Relief Treatment Classes
steel components with tensile strengths above 1400 MPa (with
5.1 With the exception of surface-hardened parts and parts
corresponding hardness values of 425 HV , 401 HB, or 43
10kgf that have been shot peened in accordance with Specification
HR ).
C
B851,heattreatmentconditionsmaybeselectedonthebasisof
4.3 Table 1 provides a list of embrittlement-relief heat-
actual tensile strength. When only the minimum tensile
treatment classes from which the purchaser may specify the
strength is specified, or if the tensile strength is not known, the
treatmentrequiredtotheelectroplater,supplier,orprocessoron
heat treatment condition may be selected by relating known or
the part drawing or purchase order.
measured hardness values to equivalent tensile strengths. It is
recommended that the tensile strength be supplied by the
NOTE 2—The treatment class selected is based on experience with the
part, or similar parts, and the specific alloy used or with empirical test purchaser.
data. Because of factors such as alloy composition and structure, type of
5.2 Ste
...