ASTM A1021-01

Standard Specification for Martensitic Stainless Steel Forgings and Forging Stock for High-Temperature Service

SCOPE
1.1 This specification covers martensitic chromium stainless steel forgings, forged bar, and forging stock for high temperature service. The mechanical properties are developed by suitable heat treatment, as indicated for each alloy.
1.2 The values stated in inch-pound units are to be regarded as standard.

General Information

• Status: Historical
• Publication Date: 09-Sep-2001
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaced By: ASTM A1021-02 - Standard Specification for Martensitic Stainless Steel Forgings and Forging Stock for High-Temperature Service
• Effective Date: 10-Sep-2002

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 1021 – 01
Standard Specification for
Martensitic Stainless Steel Forgings and Forging Stock for
High-Temperature Service
This standard is issued under the fixed designation A 1021; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope In case of conflict between the requirements of this specifica-
tion and Specification A 788, this specification shall prevail.
1.1 This specification covers martensitic chromium stainless
steel forgings, forged bar, and forging stock for high tempera-
5. Manufacture
ture service. The mechanical properties are developed by
5.1 Melting Process—All melting processes of Specifica-
suitable heat treatment, as indicated for each alloy.
tion A 788 are permitted unless the purchaser invokes Supple-
1.2 The values stated in inch-pound units are to be regarded
mentary Requirement S1.
as standard.
5.2 Forging Process—Either the closed impression die or
2. Referenced Documents the open die, including ring rolling, forging processes may be
utilized unless the purchaser specifies a process.
2.1 ASTM Standards:
5.3 Heat Treatment—Quenched and tempered classes shall
A 275 Test Method for Magnetic Particle Examination of
2 be heat-treated in accordance with Table 1.
Steel Forgings
5.3.1 Number of Heat Treatments—Heat treatment as de-
A 370 Test Methods and Definitions for Mechanical Testing
3 fined in Table 1 shall consist of austenitizing, quenching, and
of Steel Products
tempering. Retempering is permitted but purchaser approval is
A 788 Specification for Steel Forgings, General Require-
2 required for more than one complete reheat treatment.
ments
5.4 Stress Relief—When heat treatment for mechanical
E 112 Test Methods for Determining Average Grain Size
properties is followed by straightening, a stress-relieving heat
E 292 Test Methods for Conducting Time-For-Rupture
treatment is required in accordance with Table 1.
Notch Tension Tests of Materials
5.4.1 Quenching after Stress Relief—Liquid quenching of
E 381 Method of Macroetch Testing Steel Bars, Billets,
stress-relieved forgings is prohibited.
Blooms, and Forgings
5.5 Finish—Forgings may be furnished in one of the fol-
E 562 Test Method for Determining Volume Fraction by
lowing hot-finished conditions:
Systematic Manual Point Count
5.5.1 Finish F—As forged without descaling.
3. Ordering Information
5.5.2 Finish FD—Forged and descaled.
5.5.3 Finish RT—Rough turned or rough machined to
3.1 In addition to the ordering information required by
specified dimensions. Billets or blooms ordered as forging
Specification A 788, the purchaser shall specify the grade
stock shall be furnished with a ground, machined, or descaled
designation, heat treatment condition, class and finish, and
surface unless otherwise specified in the ordering document.
include a sketch or written description of the forging with the
5.6 Camber—Camber shall not exceed ⁄4 in. (5 mm) in 5 ft
inquiry and order.
(150 cm).
4. General Requirements
6. Chemical Composition
4.1 Materials supplied to this specification shall conform to
6.1 The steel shall conform to the requirements for chemical
the requirements of Specification A 788, including any supple-
composition prescribed in Table 2.
mentary requirements that are indicated in the purchase order.
Failure to comply with the general requirements of Specifica-
7. Mechanical Properties
tion A 788 constitutes non-conformance with this specification.
7.1 Tension, Impact and Hardness Tests—All testing shall
be performed after heat treatment and stress relief, as appli-
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
cable. The material and test specimens shall meet the require-
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
ments of Table 3 if fully heat-treated or Table 4 if annealed.
A01.06 on Steel Forgings and Billets.
Current edition approved Sept. 10, 2001. Published October 2001.
Mechanical property requirements, including hardness, do not
Annual Book of ASTM Standards, Vol 01.05.
apply to forging stock when it is to be tested after forging and
Annual Book of ASTM Standards, Vol 01.03.
4 heat treatment.
Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 1021
TABLE 1 Heat Treatment, °F (°C)
Grade A Grade B Grade C Grade D Grade E
Class1&2 Class 1 Class 1 Class 2 Class1&2 Class 1 Class 2
Austenitizing 1725-1775 1600-1750 1825-1875 1725-1875 1875-1925 2075-2125 1725-1775
(940-970) (870-955) (995-1025) (940-1025) (1025-1050) (1135-1165) (940-970)
Quenching Air or liquid Air or liquid Air or liquid Air or liquid Air or liquid Air or liquid Air or liquid
Single Tempering 1050 min 1050 min 1050 min 1050 min 1150 min 1250 min 1100 min
(565 min) (565 min) (565 min) (565 min) (620 min) (675 min) (595 min)
Double Tempering . . . . . . 1025 min 1025 min . . .
(550 min) (550 min)
Stress Relieving 1025 min 1025 min 1000 min 1000 min 1100 min 1200 min 1050 min
(550 min) (550 min) (540 min) (540 min) (595 min) (650 min) (565 min)
A
TABLE 2 Chemical Requirements
Composition %
Grade A Grade B Grade C Grade D Grade E
Type—Similar to 403/410 SS 403/410 SS XM-32 Mod 422 SS UNS S41041
UNS S41000 MOD.
Carbon 0.15 0.10-0.15 0.10-0.17 0.20.-0.25 0.13-0.18
Manganese 1.00 0.25-0.80 0.65-1.05 0.50-1.00 0.40-0.60
Phosphorus 0.018 0.018 0.020 0.025 0.030
Sulfur 0.015 0.015 0.015 0.010 0.030
Silicon 1.00 0.50 0.35 0.50 0.50
Nickel 0.75 0.75 2.25-3.25 0.50-1.00 0.50
Chromium 11.5-13.5 11.5-13.0 11.25-12.75 11.0-12.5 11.5-13.0
Molybdenum 0.50 0.50 1.50-2.00 0.90-1.25 0.20
Vanadium . . . Report only 0.25-0.40 0.20-0.30 . . .
Tungsten . . . 0.10 0.10 0.9-1.25 . . .
Nitrogen . . . 0.08 0.020-0.045 Report only . . .
Aluminum . . . 0.025 0.025 0.025 0.050
Columbium . . . 0.20 . . . . . . 0.15-0.45
Cobalt . . . . . . . . . 0.20 . . .
Titanium . . . 0.05 0.05 0.025 . . .
Copper . . . 0.50 0.50 0.50 . . .
Tin . . . 0.05 0.05 0.02 . . .
A
Maximum or range unless otherwise specified.
TABLE 3 Mechanical Properties—Quenched & Tempered Classes
Grade A Grade B Grade C Grade D Grade E
Class 1 Class 2 Class 1 Class 1 Class 2 Class 1 Class 2 Class 1 Class 2
Tensile strength, 100 (690) 110 (760) 110 (760) 145 (1000) 160 (1105) 140 (965) 140 (965) 115 (795) 110 (760)
KSI min (MPa)
Yield Strength min, 70 (485) 80 (550) 90 (620) 115 (795) 120 (825) 90 (620) 100 (690) 75 (515) 80 (550)
KSI (MPa), 0.2 % Offset
Elongation in 2 in., min % 20 18 18 15 16 13 13 15 18
Reduction of area, min, % 60 50 50 30 50 30 35 50 55
Impact Strength, min, avg., 3
...