ASTM A355-89(2000)

Standard Specification for Steel Bars, Alloys, for Nitriding

SCOPE
1.1 This specification covers alloy steel bars, suitable for surface hardening by nitriding, designated as Classes A, B, C, and D. Class A and Class D bars are general-purpose bars; Class B bars are free-machining bars; Class C bars contain 3.50% nickel and are characterized by higher core strength. All classes are normally furnished in the hot-rolled, quenched, and tempered condition. However, centerless-ground or turned bars, in any of the classes, may be specified by the purchaser. Also, as-rolled, annealed, or unannealed bars suitable for forging may be purchased to this specification. When as-rolled, annealed, or unannealed bars are furnished, Sections 7, 11, and 12 are not applicable.  
1.2 The values stated in inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 31-Dec-1999
• ICS: 77.140.60 - Steel bars and rods
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.15 - Bars

Relations

• Replaced By: ASTM A355-89(2006) - Standard Specification for Steel Bars, Alloys, for Nitriding
• Effective Date: 01-Mar-2006

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A 355 – 89 (Reapproved 2000)
Standard Specification for
Steel Bars, Alloys, for Nitriding
This standard is issued under the fixed designation A 355; 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 3.1.11 Report of ladle analysis if desired (Section 10),
3.1.12 Straightness (Section 11),
1.1 This specification covers alloy steel bars, suitable for
3.1.13 ASTM designation A 355, and
surface hardening by nitriding, designated as Classes A, B, C,
3.1.14 End use, exceptions to the specification, or special
and D. Class A and Class D bars are general-purpose bars;
requirements.
Class B bars are free-machining bars; Class C bars contain
3.50 % nickel and are characterized by higher core strength.
4. Process
All classes are normally furnished in the hot-rolled, quenched,
4.1 The steel shall be made by the electric-furnace process
and tempered condition. However, centerless-ground or turned
only.
bars, in any of the classes, may be specified by the purchaser.
Also, as-rolled, annealed, or unannealed bars suitable for
5. Discard
forging may be purchased to this specification.When as-rolled,
5.1 Sufficient discard shall be made from each ingot to
annealed, or unannealed bars are furnished, Sections 6, 10, and
ensure freedom from injurious piping and undue segregation.
11 are not applicable.
1.2 The values stated in inch-pound units are to be regarded
6. Quenching and Tempering
as the standard.
6.1 The bars shall be given a liquid quench followed by a
tempering treatment at a temperature not lower than 600°C
2. Referenced Documents
(1112°F) to produce a fine spheroidized structure.
2.1 ASTM Standards:
A 29/A 29M SpecificationforSteelBars,CarbonandAlloy,
7. Microstructure
Hot-Wrought and Cold Finished, General Requirements
2 7.1 When specified the microstructure resulting from the
for
heat treatment specified in Section 7 shall not show free ferrite
in amounts exceeding those prescribed in Table 1. Other
3. Ordering Information
percentages of free ferrite may be supplied by agreement
3.1 Orders under this specification should include the fol-
between the manufacturer and the purchaser.
lowingasrequiredtoadequatelydescribethedesiredmaterials:
7.2 The amount of free ferrite shall be determined by
3.1.1 Quantity (weight or number of pieces),
metallographic examination under suitable magnification of a
3.1.2 Name of material (alloy steel bars, for nitriding),
specimen from the bars in the quenched and tempered condi-
3.1.3 Surface finish (Section 1),
tion. The number and location of tests and details of the basis
3.1.4 Cross-sectional shape,
of establishing free ferrite shall be as agreed upon between the
3.1.5 Size,
manufacturer and the purchaser.
3.1.6 Length (Section 15),
3.1.7 Class (Section 10),
8. Decarburization
3.1.8 Thermal treatment (Section 1),
8.1 The maximum depth of total and partial decarburization
3.1.9 Hardness (Section 12),
of hot-rolled bars and heat-treated bars shall not exceed the
3.1.10 Microstructure when desired (Section 8),
amounts prescribed in Table 2.
8.2 Centerless-ground or turned bars shall be free from total
and partial decarburization.
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys, and is the direct responsibility of Subcommittee
A01.15 on Bars.
9. HeatAnalysis
Current edition approved Dec. 7, 1989. Published February 1990. Originally
9.1 The steel shall conform to the requirements as to cast or
published as A 355–52T. Last previous edition A 355–81(1988).
heat (formerly ladle) analysis prescribed in Table 3.
Annual Book of ASTM Standards, Vol 01.05.
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A 355 – 89 (2000)
TABLE 1 Permissible Free Ferrite TABLE 4 Hardness Requirements
Permissible Free Hardness
Diameter or Thickness, in. (mm) Ferrite Area, Hardness Scale Range 1 Range 2
max, % Brinell 223 to 269 248 to 302
Rockwell C 19 to 28 24 to 32
1.00 (25.4) and under 2
Rockwell B 98 to 104 101 to 107
Over
...