ASTM A336/A336M-23

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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: A336/A336M − 21 A336/A336M − 23
Standard Specification for
Alloy Steel Forgings for Pressure and High-Temperature
Parts
This standard is issued under the fixed designation A336/A336M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers ferritic steel forgings for boilers, pressure vessels, high-temperature parts, and associated equipment.
1.2 Forgings made of steel grades listed in Specification A335/A335M, may also be ordered under this specification. The
chemical, tensile, heat treatment, and marking requirements of Specification A335/A335M shall apply, except the forging shall
conform to the chemical requirements of Tables 1 and 2 of Specification A335/A335M only with respect to heat analysis. On
product analysis they may deviate from these limits to the extent permitted in Table 1 of this specification.
1.3 Supplementary Requirements S1 to S9S10 are provided for use when additional testing or inspection is desired. These shall
apply only when specified individually by the purchaser in the order.
1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
1.5 Specification A336/A336M formerly included austenitic steel forgings, which are now found in Specification A965/A965M.
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.7 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 ASTM Standards:
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A335/A335M Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06
on Steel Forgings and Billets.
Current edition approved May 1, 2021Nov. 1, 2023. Published May 2021November 2023. Originally approved in 1955. Last previous edition approved in 20192021 as
A336/A336MA336/A336M – 21.–19. DOI: 10.1520/A0336_A0336M-21.10.1520/A0336_A0336M-23.
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-336/SA-336M in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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
A336/A336M − 23
TABLE 1 Tensile Requirements
Ferritic Steels
Grade
F91,
F11, F11, F11, F21, F21, F22, F22, Type 1
F1 F12 F5 F5A F9 F6 F6NM F911 F92 F3V F3VCb F22V
Class 2 Class 3 Class 1 Class 3 Class 1 Class 3 Class 1 and
Type 2
70- 70- 75- 60- 70- 60- 80- 85- 85- 115- 75- 60- 75- 60- 90- 90- 90- 85- 85- 85-
Tensile
95 95 100 85 95 85 105 110 110 140 100 85 100 85 110 120 120 110 110 110
strength,
[485- [485- [515- [415- [485- [415- [550- [585- [585- [790- [515- [415- [515- [415- [620- [620- [620- [585- [585- [585-
ksi [MPa]
660] 660] 690] 585] 660] 585] 725] 760] 760] 965] 690] 585] 690] 585] 760] 830] 830] 760] 760] 760]
70– 70– 75– 60– 70– 60– 80– 85– 85– 115– 75– 60– 75– 60– 90– 90– 90– 85– 85– 85–
Tensile
95 95 100 85 95 85 105 110 110 140 100 85 100 85 110 120 120 110 110 110
strength,
[485– [485– [515– [415– [485– [415– [550– [585– [585– [790– [515– [415– [515– [415– [620– [620– [620– [585– [585– [585–
ksi [MPa]
660] 660] 690] 585] 660] 585] 725] 760] 760] 965] 690] 585] 690] 585] 760] 830] 830] 760] 760] 760]
Yield
strength, 40 40 45 30 40 36 50 55 55 90 45 30 45 30 60 64 64 60 60 60
min, ksi [275] [275] [310] [205] [275] [250] [345] [380] [380] [620] [310] [205] [310] [205] [415] [440] [440] [415] [415] [415]
[MPa]
Elongation
in 2 in. or
20 20 18 20 20 20 19 20 18 15 19 20 19 20 20 20 20 18 18 18
50 mm,
min, %
Reduction
of area, 40 40 40 45 40 40 35 40 35 45 40 45 40 45 40 40 45 45 45 45
min, %
A336/A336M − 23
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A788/A788M Specification for Steel Forgings, General Requirements
A965/A965M Specification for Steel Forgings, Austenitic, for Pressure and High Temperature Parts
E165/E165M Practice for Liquid Penetrant Testing for General Industry
2.2 ASME Boiler and Pressure Vessel Code:
Section III Nuclear Power Plant Components
Section IX Welding and Brazing Qualifications
2.3 AWS Specifications:
A5.5/A5.5M Low-Alloy Steel Electrodes for Shielded Metal Arc Welding
A5.23/A5.23M Low-Alloy Steel Electrodes and Fluxes for Submerged Arc Welding
A5.28/A5.28M Low-Alloy Steel Electrodes for Gas Shielded Arc Welding
A5.29/A5.29M Low-Alloy Steel Electrodes for Flux Cored Arc Welding
3. Ordering Information and General Requirements
3.1 In addition to the ordering information required by Specification A788/A788M, the purchaser should include with the inquiry
and order the following information:
3.1.1 A drawing or sketch that shows test locations when the testing is in accordance with 8.2.1.3.
3.1.2 The intended use of forgings if 5.1 is applicable.
3.2 Material supplied to this specification shall conform to the requirements of Specification A788/A788M, which outlines
additional ordering information, manufacturing requirements, testing and retesting methods and procedures, marking, certification,
product analysis variations, and additional supplementary requirements.
3.3 If the requirements of this specification are in conflict with the requirements of Specification A788/A788M, the requirements
of this specification shall prevail.
3.4 For hubbed flatheads and tube sheets ordered for ASME Boiler and Pressure Vessel Code application, Supplementary
Requirement S12 of Specification A788/A788M shall be specified.
3.5 At the purchaser’s request the forgings shall be rough machined before heat treatment (5.2).
3.6 For Section III, Part NB of the ASME Boiler and Pressure Vessel Code application, Supplementary Requirement S3 shall be
specified.
4. Melting and Forging
4.1 In addition to the melting and forging requirements of Specification A788/A788M, which may be supplemented by
Supplementary Requirement S8, the following conditions apply:
4.1.1 A sufficient discard shall be made to secure freedom from injurious pipe and undue segregation.
5. Machining
5.1 Forged pressure vessels for steam power service shall have the inner surface machined or ground. Unfired pressure vessels
shall have the inner surfaces sufficiently free of scale to permit inspection.
5.2 Unless otherwise specified by the purchaser, when rough machining is performed, it may be done either before or after heat
treatment at the manufacturer’s option.
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 American Welding Society (AWS), 8669 NW 36 St., #130, Miami, FL 33166-6672, http://www.aws.org.
A336/A336M − 23
6. Heat Treatment
6.1 Except as permitted in 6.1.1 for Grade F22V, and in 6.1.2 for Grade F91 Type 1 and Type 2 and Grade F92, the steel forgings
shall be annealed or normalized and tempered but alternatively may be liquid quenched and tempered when mutually agreed upon
between the manufacturer and the purchaser. For all grades, normalizing or liquid quenching shall be followed by tempering at
a subcritical temperature as shown in 6.1.4.
6.1.1 Grade F22V forgings shall be normalized and tempered or liquid quenched and tempered at the manufacturer’s option.
6.1.1.1 For Grade F22V forgings the minimum austenitizing temperature shall be 1650 °F [900 °C].
6.1.2 Grade F91 Type 1 and Type 2 forgings having any section thickness greater than 3 in. [75 mm] shall be normalized and
tempered or liquid quenched and tempered at the manufacturer’s option. Grade F92 forgings shall be normalized and tempered or
liquid quenched and tempered at the manufacturer’s option.
6.1.2.1 For Grade F91 Type 1 and Type 2, F911, and F92 forgings, the austenitizing temperature shall be in the range of 1900 °F
to 1975 °F [1040 °C to 1080 °C].
6.1.3 For Grade F6NM the austenitizing temperature shall be 1850 °F [1010 °C] minimum. The tempering temperature range shall
be as shown in 6.1.4.
6.1.4 Except for the following grades, the minimum tempering temperature shall be 1100 °F [595 °C]:
Grade Tempering Temperature
Minimum or Range, °F [°C]
F6 1150 [620]
F6NM 1040–1120 [560–600]
F11, Class 2 1150 [620]
F11, Class 3 1150 [620]
F11, Class 1 1150 [620]
F5, F5a 1250 [675]
F9 1250 [675]
F21, Class 1 1250 [675]
F3V, F3VCb 1250 [675]
F22, Class 1 1250 [675]
F22V 1250 [675]
F91 Type 1 and Type 2, F92 1350–1470 [730–800]
F911 1365–1435 [740–780]
F22, Class 3 1250 [675]
7. Chemical Composition
7.1 Heat Analysis—The heat analysis obtained from sampling in accordance with Specification A788/A788M and shall comply
with Table 2.
7.2 Product Analysis—The manufacturer shall use the product analysis provision of Specification A788/A788M to obtain a
product analysis from a forging representing each heat or multiple heat. The product analysis for columbium and calcium for Grade
F22V shall conform to the requirements of Table 2 of this specification. Boron is not subject to product analysis. The purchaser
may also make this determination in accordance with Specification A788/A788M.
8. Mechanical Properties
8.1 General Requirements—The material shall conform to the requirements for mechanical properties prescribed in Table 1. The
largest obtainable tension test specimen as specified in Test Methods and Definitions A370 shall be used.
8.2 Sampling—The mid-point of the gauge length of tension test specimens and the area under the notch of impact specimens shall
be located in accordance with one of the following methods as specified by the purchaser, or suggested by the supplier and
approved by the purchaser. Unless otherwise noted, all testing shall be from integral prolongations of the forging.
A336/A336M − 23
A
TABLE 2 Chemical Requirements
Composition, %
Grade
B B
Element F1 F11, Classes 2 F11, Class 1 F12 F5 F5A F9 F6 F6NM
and 3
Carbon 0.20–0.30 0.10–0.20 0.05–0.15 0.10–0.20 0.15 max 0.25 max 0.15 max 0.12 max 0.05 max
Manganese 0.60–0.80 0.30–0.80 0.30–0.60 0.30–0.80 0.30–0.60 0.60 max 0.30–0.60 1.00 max 0.50–1.00
Phosphorus, 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.020
max
Sulfur, max 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.015
Silicon 0.20–0.35 0.50–1.00 0.50–1.00 0.10–0.60 0.50 max 0.50 max 0.50–1.00 1.00 max 0.60 max
Nickel . . . . . . . . . . . . 0.50 max 0.50 max . . . 0.50 max 3.5–5.5
Chromium . . . 1.00–1.50 1.00–1.50 0.80–1.10 4.0–6.0 4.0–6.0 8.0–10.0 11.5–13.5 11.5–14
Molybdenum 0.40–0.60 0.45–0.65 0.44–0.65 0.45–0.65 0.45–0.65 0.45–0.65 0.90–1.10 . . . 0.50–1.00
Grade
Element F21, Classes F22, Classes
1 and 3 1 and 3
Carbon 0.05–0.15 0.05–0.15
Manganese 0.30–0.60 0.30–0.60
Phosphorus, 0.025 0.025
max
Sulfur, max 0.025 0.025
Silicon 0.50 max 0.50 max
Nickel . . . . . .
Chromium 2.7–3.3 2.00–2.50
Molybdenum 0.80–1.06 0.90–1.10
Vanadium . . . . . .
Copper . . . . . .
Nitrogen . . . . . .
C
Columbium . . . . . .
Element Grade F91 Grade F91 Grade F911 Grade F92 F3V F3VCb F22V
Type 1 Type 2
Carbon 0.08–0.12 0.08–0.12 0.09–0.13 0.07–0.13 0.10–0.15 0.10–0.15 0.11–0.15
Heat Product . . . 0.07–0.13 . . . . . . . . . . . . . . .
D
Manganese 0.30–0.60 0.30–0.50 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60
D
Phosphorus, 0.025 0.020 0.020 0.020 0.020 0.020 0.015
max
D
Sulfur, max 0.025 0.005 0.010 0.010 0.020 0.010 0.010
D
Silicon 0.20–0.50 0.20–0.40 0.10–0.50 0.50 0.10 max 0.10 max 0.10 max
D
Nickel 0.40 max 0.20 max 0.40 max 0.40 . . . 0.25 max 0.25 max
D
Chromium 8.0–9.5 8.0–9.5 8.5–9.5 8.50–9.50 2.7–3.3 2.7–3.3 2.00–2.50
Molybdenum 0.85–1.05 0.85–1.05 0.90–1.10 0.30–0.60 0.90–1.10 0.90–1.10 0.90–1.10
Vanadium 0.18–0.25 0.18–0.25 0.18–0.25 0.15–0.25 0.20–0.30 0.20–0.30 0.25–0.35
Heat Product . . . 0.16–0.27 . . . . . . . . . . . . . . .
C
Columbium 0.06–0.10 0.06–0.10 0.06–0.10 0.04–0.09 . . . 0.015–0.070 0.07 max
D
Nitrogen 0.03–0.07 0.035–0.070 0.04–0.09 0.030–0.070 . . . . . . . . .
D D D
Aluminum 0.02 max 0.02 max 0.02 max 0.02 . . . . . . . . .
D
Boron . . . 0.001 max 0.0003–0.006 0.001–0.006 0.001–0.003 . . . 0.0020 max
N/Al ratio . . . $4.0 . . . . . . . . . . . . . . .
D
Tungsten . . . 0.05 max 0.90–1.10 1.50–2.00 . . . . . . . . .
D D D
Titanium 0.01 max 0.01 max 0.01 max 0.01 0.015–0.035 0.015 max 0.030 max
D
Copper . . . 0.10 max . . . . . . . . . 0.25 max 0.20 max
E
Calcium . . . . . . . . . . . . . . . 0.0005–0.0150 0.015 max
D D D
Zirconium 0.01 max 0.01 max 0.01 max 0.01 . . . . . . . . .
D
Tin . . . 0.010 max . . . . . . . . . . . . . . .
D
Antimony . . . 0.003 max . . . . . . . . . . . . . . .
D
Arsenic . . . 0.010 max . . . . . . . . . . . . . . .
A
Where ellipses (.) appear in this table, there is no requirement, and the element need neither be analyzed for nor reported.
B
The present Grade F5A (0.25 %, maximum carbon) previous to 1955 was assigned the identification symbol F5. Identification symbol F5 has been assigned to the
0.15 %, maximum, carbon grade to be consistent with ASTM specifications for other products such as pipe, tubing, bolting, welding, fittings, etc.
C
Columbium (Cb) and Niobium (Nb) are alternate names for Element 41 in the Periodic Table of the Elements.
D
Applies to both heat and product analyses.
E
For Grade F22V, rare earth metals (REM) may be added in place of calcium subject to agreement between the producer and the purchaser. In that case the total amount
of REM shall be determined and reported.
8.2.1 Except as required in 3.4, for annealed, normalized, and tempered or quenched and tempered forgings, the longitudinal axis
of the tension test specimens, and, when required, Charpy impact test specimens, shall be parallel to the direction of major working
A336/A336M − 23
of the forging, except when Supplementary
...