ASTM A858/A858M-19

Standard Specification for Heat-Treated Carbon Steel Fittings for Low-Temperature and Corrosive Service

ABSTRACT
This specification covers heat-treated wrought carbon steel piping fittings with lowered carbon content of seamless and electric fusion-welded construction for low-temperature and corrosive service applications. These fittings are for use in pressure components where inherent notch toughness and optimum sulfide-cracking resistance are required, such as oil and gas industry piping and distribution systems. The materials shall be manufactured by forging and shaping methods which involves hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of these operations. Fittings shall be heat treated by normalizing, quenching, and tempering or stress-relieving. Product analyses shall be performed wherein specimens shall conform to required chemical composition of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, and copper. The fittings shall undergo tension and impact tests, and shall conform to the following mechanical requirements: yield strength, tensile strength, elongation, and notch toughness.
SCOPE
1.1 This specification covers heat-treated wrought carbon steel piping fittings with lowered carbon content of seamless and electric fusion-welded construction covered by the latest revisions in ASME B16.9, ASME B16.11, MSS SP-75, MSS SP-79, MSS SP-83, MSS SP-95, or MSS SP-97. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M. These fittings are for use in pressure components where inherent notch toughness and optimum sulfide-cracking resistance are required, such as oil and gas industry piping and distribution systems.  
1.2 Optional supplementary requirements are provided for fittings when a greater degree of examination is desired. One or more of the supplementary requirements may be specified in the order.  
1.3 This specification does not cover cast-welding fittings or fittings machined from castings.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Unless the other specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Nov-2019
• ICS: 23.040.40 - Metal fittings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.22 - Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications

Relations

• Replaces: ASTM A858/A858M-14 - Standard Specification for Heat-Treated Carbon Steel Fittings for Low-Temperature and Corrosive Service
• Effective Date: 01-Dec-2019
• Refers: ASTM A960/A960M-19a - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Nov-2019
• Refers: ASTM A960/A960M-19 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Mar-2019
• Refers: ASTM A960/A960M-16a - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Dec-2016
• Refers: ASTM A960/A960M-16 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Jun-2016
• Refers: ASTM A960/A960M-15 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Nov-2015
• Refers: ASTM A960/A960M-14a - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Nov-2014
• Refers: ASTM A960/A960M-14 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-May-2014
• Refers: ASTM A960/A960M-13 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-May-2013
• Refers: ASTM A960/A960M-08 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-May-2008
• Refers: ASTM A960/A960M-07 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Feb-2007
• Refers: ASTM A960/A960M-06 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Mar-2006
• Refers: ASTM A960/A960M-04a - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-May-2004
• Refers: ASTM A960/A960M-04 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Mar-2004
• Referred By: ASTM A960/A960M-23 - Standard Specification for Common Requirements for Wrought Steel Piping Fittings
• Effective Date: 01-Dec-2019

Overview

ASTM A858/A858M-19 is the internationally recognized standard specification developed by ASTM for heat-treated wrought carbon steel piping fittings used in low-temperature and corrosive service applications. This standard covers both seamless and electric fusion-welded fittings with reduced carbon content, specifically designed for use in pressure components demanding excellent notch toughness and sulfide-cracking resistance. The document outlines the requirements for material composition, manufacture, heat treatment, testing, certification, and product marking, ensuring reliable performance in critical piping systems, particularly in oil and gas distribution.

Key Topics

• Material Requirements:

  • Specifies fully killed, fine-grain, heat-treated carbon steel.
  • Requires controlled chemical composition, focusing on elements such as carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, and copper.
  • Excludes cast-welding fittings or fittings machined from castings.
  • Ensures material is suitable for field welding without mandatory preheating under certain conditions.

• Manufacturing and Heat Treatment:

  • Allows for a variety of forging and shaping operations, including hammering, pressing, extruding, upsetting, bending, welding, and machining.
  • All fittings must be heat-treated by normalizing, quenching and tempering, or stress-relieving to meet toughness requirements.

• Testing and Mechanical Properties:

  • Mandates thorough product analyses and mechanical testing, including tension and impact (Charpy V-notch) tests.
  • Sets specific requirements for yield strength, tensile strength, elongation, reduction of area, and notch toughness at low temperatures.
  • Requires radiographic examination of all welds and additional non-destructive examination (NDE) for fittings like butt-weld tees and caps.

• Dimensional Standards and Marking:

  • References widely recognized standards such as ASME B16.9, B16.11, and multiple MSS specifications for dimensional and fitting types.
  • Requires permanent markings for traceability, heat treatment condition, and any supplementary certifications.

Applications

ASTM A858/A858M-19 is essential for industries where piping systems are exposed to low temperatures and corrosive environments. Typical applications include:

• Oil and Gas Industry:
  Used extensively in pipelines, pressure vessels, and distribution systems that demand high reliability under fluctuating temperatures and corrosive conditions.
• Chemical Processing Plants:
  Employed in process piping requiring superior toughness and sulfide stress-corrosion resistance.
• Power Generation:
  Applied in systems handling pressurized fluids at subzero temperatures.
• General Pressure Applications:
  Suitable for any pressure-containing components where low carbon steel with high notch toughness is needed.

The standard allows for customization through supplementary requirements for higher degrees of examination, making it adaptable for projects with critical safety and reliability needs.

Related Standards

When implementing ASTM A858/A858M-19, familiarity with the following standards is beneficial:

• ASTM A960/A960M: Common requirements for wrought steel piping fittings.
• ASME B16.9: Steel butt-welding fittings.
• ASME B16.11: Forged steel fittings, socket-welding, and threaded.
• MSS SP-75: High test wrought butt-welding fittings.
• MSS SP-79: Socket welding reducer inserts.
• MSS SP-83: Steel pipe unions, socket-welding, and threaded.
• MSS SP-95: Swaged nipples and bull plugs.
• MSS SP-97: Integrally reinforced forged branch outlet fittings.
• ASME Boiler and Pressure Vessel Code, Sections V, VIII, and IX: Governing materials, welding, and inspection for pressure equipment.
• SNT-TC-1A: Personnel qualification and certification for nondestructive testing.

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By adhering to ASTM A858/A858M-19, manufacturers and end users ensure that carbon steel fittings deliver consistent quality, safety, and performance in demanding low-temperature and corrosive service environments. This standard underpins the reliability of critical infrastructure across energy and process industries.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A858/A858M −19
Standard Specification for
Heat-Treated Carbon Steel Fittings for Low-Temperature and
Corrosive Service
This standard is issued under the fixed designationA858/A858M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
1.1 This specification covers heat-treated wrought carbon
2.1 In addition to those reference documents listed in
steel piping fittings with lowered carbon content of seamless
Specification A960/A960M, the following list of standards
and electric fusion-welded construction covered by the latest
apply to this specification.
revisions in ASME B16.9, ASME B16.11, MSS SP-75, MSS
2.2 ASTM Standards:
SP-79, MSS SP-83, MSS SP-95, or MSS SP-97. Fittings
A960/A960MSpecification for Common Requirements for
differing from these ASME and MSS standards shall be
Wrought Steel Piping Fittings
furnished in accordance with Supplementary Requirement S58
of Specification A960/A960M. These fittings are for use in 2.3 ASME Standards:
B16.9Steel Butt-Welding Fittings
pressure components where inherent notch toughness and
optimum sulfide-cracking resistance are required, such as oil B16.11Forged Steel Fittings, Socket Welding and Threaded
and gas industry piping and distribution systems.
2.4 MSS Standards:
1.2 Optional supplementary requirements are provided for MSS SP-75Specification for High Test Wrought Butt-
Welding Fittings
fittingswhenagreaterdegreeofexaminationisdesired.Oneor
MSS SP-79Socket Welding Reducer Inserts
more of the supplementary requirements may be specified in
MSS SP-83 Steel Pipe Unions, Socket-Welding and
the order.
Threaded
1.3 Thisspecificationdoesnotcovercast-weldingfittingsor
MSS SP-95Swage(d) Nipples and Bull Plugs
fittings machined from castings.
MSS SP-97Integrally Reinforced Forged Branch Outlet
1.4 The values stated in either SI units or inch-pound units
Fittings—Socket Welding, Threaded and Buttwelding
are to be regarded separately as standard. Within the text, the
Ends
SI units are shown in brackets. The values stated in each
2.5 ASME Boiler and Pressure Vessel Code:
system may not be exact equivalents; therefore, each system
Section V
shall be used independently of the other. Combining values
Section VIIIDivision 1
from the two systems may result in non-conformance with the
Section IX
standard. Unless the other specifies the applicable “M” speci-
2.6 American Society of Nondestructive Testing:
fication designation (SI units), the material shall be furnished
SNT-TC-1A Recommended Practice for Nondestructive
to inch-pound units.
Testing Personnel Qualification and Certification
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Development of International Standards, Guides and Recom-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
mendations issued by the World Trade Organization Technical
Standards volume information, refer to the standard’s Document Summary page on
Barriers to Trade (TBT) Committee.
the ASTM website.
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
1 4
This specification is under the jurisdiction ofASTM Committee A01 on Steel, AvailablefromManufacturersStandardizationSocietyoftheValveandFittings
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
A01.22onSteelForgingsandWroughtFittingsforPipingApplicationsandBolting hq.com.
Materials for Piping and Special Purpose Applications. Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Current edition approved Dec. 1, 2019. Published December 2019. Originally Dr., Warrendale, PA 15096-0001, http://www.sae.org.
approved in 1986. Last previous edition approved in 2014 as A858/A858M–14. AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
DOI: 10.1520/A0858_A0858M-19. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A858/A858M−19
3. Ordering Information 6.2.1 Made by welders, welding operators, and welding
procedures qualified under the provisions of ASME Boiler and
3.1 In addition to the requirements of Specification A960/
Pressure Vessel Code, Section IX,
A960M, the following ordering information applies: require-
6.2.2 Heat treated in accordance with Section 7 of this
ments for certification of the test report.
specification, and
6.2.3 Radiographically examined throughout the entire
4. General Requirements
length of each weld in accordance with Articles 1 and 2 of
4.1 Products furnished to this specification shall conform to
ASME Boiler and Pressure Vessel Code, Section V with the
the requirements of Specification A960/A960M, including any
acceptance limits in accordance with Paragraph UW-51 in
supplementary requirements that are indicated in the purchase
Section VIII of that same code.
order. Failure to comply with the general requirements of
6.3 The welded joints of the fittings shall be furnished in
Specification A960/A960M constitutes nonconformance with
accordance with the requirements of Paragraph UW-35(a) of
this specification. In case of conflict between the requirements
ASME Boiler and Pressure Vessel Code, Section VIII.
of this specification and Specification A960/A960M, this
specification shall prevail.
6.4 All butt-weld tees manufactured by cold-forming meth-
ods shall be liquid-penetrant or magnetic-particle examined by
5. Materials
one of the methods specified in Specification A960/A960M.
5.1 The material for fittings shall be fully killed fine-grain
This examination shall be performed in accordance with a
material made by a melting process that is intended to produce
written procedure and shall be performed after final heat
rounded, well dispersed, fine sulfide inclusions, that promote
treatment. Only the side wall area of the tees need be
good notch toughness, assists in the resistance to hydrogen
examined. This area is defined by a circle that covers the area
induced cracking, and for weldability suitable for field-
fromtheweldbevelofthebranchoutlettothecenterlineofthe
welding.
body or run. Internal and external surfaces shall be examined
when size permits accessibility. No cracks shall be permitted.
5.2 Starting materials shall consist of plate, sheet, forgings,
OtherimperfectionsshallbetreatedinaccordancewithSection
forging quality bar and seamless or fusion welded tubular
14 on finish. After the removal of any crack, the tees shall be
products with filler metal added. The chemical composition
re-examined by the original method. Acceptable tees shall be
shall conform to Table 1.
marked with the symbol PT or MT, as applicable, to indicate
5.3 Astartingmaterialthatspecificallyrequirestheaddition
compliance. NDE personnel shall be qualified in accordance
of any element beyond those listed in Table 1 is not permitted.
with SNT-TC-1A.
This does not preclude the use of deoxidizers.
6.5 All caps machined from bar stock shall be examined by
5.4 Starting materials shall not require a preheat for field
liquid penetrant or magnetic particle in accordance with
welding provided that the restrictions of ASME Boiler and
Supplementary Requirement S69 or S70 with personnel
Pressure Vessel Code, Section VIII, Paragraph UW-30 are
qualifications, acceptance criteria and marking as in 5.4.
complied with.
7. Heat Treatment
6. Manufacture
7.1 All fittings shall be furnished in the heat-treated condi-
6.1 Forging or shaping operations may be performed by
tion. Fittings formed above the transformation temperature or
hammering, pressing, piercing, extruding, upsetting, rolling,
uponwhichweldingisperformed,shallbecooledtobelowthe
bending, fusion welding, machining, or by a combination of
lowercriteriatemperaturepriortoheattreatment.Fittingsshall
these operations.
subsequently be heat treated by normalizing, quenching, and
6.2 All welds including welds in tubular products from
tempering or stress-relieving in accordance with Specification
which the fittings are made shall be:
A960/A960M.
8. Chemical Composition Requirements
TABLE 1 Chemical Requirements
Composition % 8.1 The chemical composition of the steel shall conform to
Heat Analysis the requirements prescribed in Table 1.
Carbon 0.20
8.2 The steel shall not contain any unspecified elements for
Manganese 0.90–1.35 All values are
the ordered grade to the extent that it conforms to the
Phosphorus 0.030 maximum unless a
Sulfur 0.010 range is shown
requirements of another grade for which that element is a
A
Silicon 0.15–0.40
specified element having a required minimum content.
B
Nickel 0.50
B
Chromium 0.30
8.3 An analysis of each heat of steel shall be made from a
B
Molybdenum 0.20
sample taken preferably during the pouring of the heat. The
B
Copper 0.35
results shall conform to Table 1.
A
When vacuum carbon deoxidation is used, the silicon shall be 0.10 % maximum,
and on product analysis shall not exceed 0.12 %.
8.4 The fittings manufacturer shall make a product analysis
B
The combined total of nickel, chromium, molybdenum, and copper shall not
per heat from either the starting material or from a fitting in
exceed 1.0 %.
acc
...

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: A858/A858M − 14 A858/A858M − 19
Standard Specification for
Heat-Treated Carbon Steel Fittings for Low-Temperature and
Corrosive Service
This standard is issued under the fixed designation A858/A858M; 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.
1. Scope*
1.1 This specification covers heat-treated wrought carbon steel piping fittings with lowered carbon content of seamless and
electric fusion-welded construction covered by the latest revisions in ASME B16.9, ASME B16.11, MSS SP-75, MSS SP-79, MSS
SP-83, MSS SP-95, or MSS SP-97. Fittings differing from these ASME and MSS standards shall be furnished in accordance with
Supplementary Requirement S58 of Specification A960/A960M. These fittings are for use in pressure components where inherent
notch toughness and optimum sulfide-cracking resistance are required, such as oil and gas industry piping and distribution systems.
1.2 Optional supplementary requirements are provided for fittings when a greater degree of examination is desired. One or more
of the supplementary requirements may be specified in the order.
1.3 This specification does not cover cast-welding fittings or fittings machined from castings.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in non-conformance with the standard. Unless the
other specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 In addition to those reference documents listed in Specification A960/A960M, the following list of standards apply to this
specification.
2.2 ASTM Standards:
A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
2.3 ASME Standards:
B16.9 Steel Butt-Welding Fittings
B16.11 Forged Steel Fittings, Socket Welding and Threaded
2.4 MSS Standards:
MSS SP-25 The Standard Marking System of Valves, Fittings, Flanges and Unions
MSS SP-75 Specification for High Test Wrought Butt-Welding Fittings
MSS SP-79 Socket Welding Reducer Inserts
MSS SP-83 Steel Pipe Unions, Socket-Welding and Threaded
MSS SP-95 Swage(d) Nipples and Bull Plugs
MSS SP-97 Integrally Reinforced Forged Branch Outlet Fittings—Socket Welding, Threaded and Buttwelding Ends
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.22
on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.
Current edition approved Oct. 1, 2014Dec. 1, 2019. Published October 2014December 2019. Originally approved in 1986. Last previous edition approved in 20132014
as A858/A858MA858/A858M – 14.–13. DOI: 10.1520/A0858_A0858M-14.10.1520/A0858_A0858M-19.
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.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-hq.com.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A858/A858M − 19
2.5 ASME Boiler and Pressure Vessel Code:
Section V
Section VIII Division 1
Section IX
2.6 American Society of Nondestructive Testing:
SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification
3. Ordering Information
3.1 In addition to the requirements of Specification A960/A960M, the following ordering information applies: requirements for
certification of the test report.
4. General Requirements
4.1 Products furnished to this specification shall conform to the requirements of Specification A960/A960M, including any
supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of
Specification A960/A960M constitutes nonconformance with this specification. In case of conflict between the requirements of this
specification and Specification A960/A960M, this specification shall prevail.
5. Materials
5.1 The material for fittings shall be fully killed fine-grain material made by a melting process that is intended to produce
rounded, well dispersed, fine sulfide inclusions, that promote good notch toughness, assists in the resistance to hydrogen induced
cracking, and for weldability suitable for field-welding.
5.2 Starting materials shall consist of plate, sheet, forgings, forging quality bar and seamless or fusion welded tubular products
with filler metal added. The chemical composition shall conform to Table 1.
5.3 A starting material that specifically requires the addition of any element beyond those listed in Table 1 is not permitted. This
does not preclude the use of deoxidizers.
5.4 Starting materials shall not require a preheat for field welding provided that the restrictions of ASME Boiler and Pressure
Vessel Code, Section VIII, Paragraph UW-30 are complied with.
6. Manufacture
6.1 Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending,
fusion welding, machining, or by a combination of these operations.
6.2 All welds including welds in tubular products from which the fittings are made shall be:
6.2.1 Made by welders, welding operators, and welding procedures qualified under the provisions of ASME Boiler and Pressure
Vessel Code, Section IX,
6.2.2 Heat treated in accordance with Section 7 of this specification, and
6.2.3 Radiographically examined throughout the entire length of each weld in accordance with Articles 1 and 2 of ASME Boiler
and Pressure Vessel Code, Section V with the acceptance limits in accordance with Paragraph UW-51 in Section VIII of that same
code.
TABLE 1 Chemical Requirements
Composition %
Heat Analysis
Carbon 0.20
Manganese 0.90–1.35 All values are
Phosphorus 0.030 maximum unless a
Sulfur 0.010 range is shown
A
Silicon 0.15–0.40
B
Nickel 0.50
B
Chromium 0.30
B
Molybdenum 0.20
B
Copper 0.35
A
When vacuum carbon deoxidation is used, the silicon shall be 0.10 % maximum,
and on product analysis shall not exceed 0.12 %.
B
The combined total of nickel, chromium, molybdenum, and copper shall not
exceed 1.0 %.
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
A858/A858M − 19
6.3 The welded joints of the fittings shall be furnished in accordance with the requirements of Paragraph UW-35(a) of ASME
Boiler and Pressure Vessel Code, Section VIII.
6.4 All butt-weld tees manufactured by cold-forming methods shall be liquid-penetrant or magnetic-particle examined by one
of the methods specified in Specification A960/A960M. This examination shall be performed in accordance with a written
procedure and shall be performed after final heat treatment. Only the side wall area of the tees need be examined. This area is
defined by a circle that covers the area from the weld bevel of the branch outlet to the center line of the body or run. Internal and
external surfaces shall be examined when size permits accessibility. No cracks shall be permitted. Other imperfections shall be
treated in accordance with Section 14 on finish. After the removal of any crack, the tees shall be re-examined by the original
method. Acceptable tees shall be marked with the symbol PT or MT, as applicable, to indicate compliance. NDE personnel shall
be qualified in accordance with SNT-TC-1A.
6.5 All caps machined from bar stock shall be examined by liquid penetrant or magnetic particle in accordance with
Supplementary Requirement S69 or S70 with personnel qualifications, acceptance criteria and marking as in 5.4.
7. Heat Treatment
7.1 All fittings shall be furnished in the heat-treated condition. Fittings formed above the transformation temperature or upon
which welding is performed, shall be cooled to below the lower criteria temperature prior to heat treatment. Fittings shall
subsequently be heat treated by normalizing, quenching, and tempering or stress-relieving in accordance with Specification
A960/A960M.
8. Chemical Composition Requirements
8.1 The chemical composition of the steel shall conform to the requirements prescribed in Table 1.
8.2 The steel shall not contain any unspecified elements for the ordered grade to the extent that it conforms to the requirements
of another grade for which that element is a specified element having a required minimum content.
8.3 An analysis of each heat of steel shall be made from a sample taken preferably during the pouring of the heat. The results
shall conform to Table 1.
8.4 The fittings manufacturer shall make a product analysis per heat from either the starting material or from a fitting in
accordance with Specification A960/A960M.
8.5 Weld metal used in the c
...