ASTM A550 - 16 (2025) 铌铁的标准规格

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Designation: A550 −16 (Reapproved 2025)
Standard Speciﬁcation for
Ferrocolumbium (Ferroniobium)
1
This standard is issued under the ﬁxed designation A550; 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 three grades of ferrocolum-
bium (ferroniobium), designated Low-Alloy Steel Grade, Al-
loy and Stainless Steel Grade, and High-Purity Grade.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
A1025/A1025M Speciﬁcation for Ferroalloys and Other Al-
loying Materials, General Requirements
E11 Speciﬁcation for Woven Wire Test Sieve Cloth and Test
Sieves
3. General Conditions for Delivery
3.1 Materials furnished to this speciﬁcation shall conform to
the requirements of Speciﬁcation A1025/A1025M, including
any supplementary requirements that are indicated in the
purchase order. Failure to comply with the general require-
ments of Speciﬁcation A1025/A1025M constitutes nonconfor-
mance with this speciﬁcation. In case of conﬂict between the
requirements of this speciﬁcation and Speciﬁcation A1025/
A1025M, this speciﬁcation shall prevail.
4. Chemical Composition
4.1 The material shall conform to the requirements as to
chemical composition speciﬁed in Tables 1 and 2. The manu-
facturer shall furnish an analysis of each shipment showing the
percentage of each element speciﬁed in Table 1.
4.2 For elements speciﬁed in Table 2 an analysis of each lot
is not required. Upon request of the purchaser, the manufac-
turer shall supply the results of an analysis for the elements
speciﬁed in Table 2 on a cumulative basis over a period
mutually agreed upon by the manufacturer and the purchaser.
5. Sizing
5.1 Ferrocolumbium (ferroniobium) is available in sizes and
to tolerances shown in Table 3.
6. Keywords
6.1 columbium (niobium); ferrocolumbium (ferroniobium);
tantalum
1
This speciﬁcation is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
Current edition approved Sept. 1, 2025. Published September 2025. Originally
approved in 1965. Last previous edition approved in 2021 as A550 – 16 (2021).
DOI: 10.1520/A0550-16R25.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at www.astm.org/contact. For Annual Book of
ASTM Standards volume information, refer to the standard’s Document Summary
page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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.
1

TABLE 1 Chemical Requirements

Element

Composition, %

Low-Alloy Steel

Grade

Alloy and Stainless

Steel Grade

High-Purity

Grade

Columbium (Niobium)

A,E

60.0–70.0 60.0–70.0 60.0–70.0

Tantalum, max 5.0 2.0 0.50

Carbon, max 0.5 0.3 0.10

Manganese, max 3.0 2.0 0.50

Silicon, max 4.0 2.5 0.40

Aluminum, max 3.0

2.0

Tin, max 0.25 0.15 0.02

Phosphorus, max 0.10 0.05 0.02

Sulfur, max 0.10 0.05 0.02

The columbium (niobium) content of any shipment shall be reported to the

nearest 0.1 %.

Or 0.25 % maximum as agreed between purchaser and seller.

Or 1.50 % maximum as agreed between purchaser and seller.

Or 1.0 % maximum as agreed between purchaser and seller.

Columbium (Cb) and niobium (Nb) refer to the same Element 41.

TABLE 2 Supplemental Chemical Requirements

NOTE 1—These are maximum limits allowable unless otherwise

stated.

Element

Composition, %

Low-Alloy

Steel Grade

Alloy and Stainless

Steel Grade

High-Purity

Grade

Chromium 1.00 1.00 0.10

Tungsten 1.00 0.5 0.05

Titanium 1.00 1.0 0.10

Lead 0.25 0.01 0.01

Cobalt 0.25 0.05 0.05

The composition of the ferrocolumbium (ferroniobium) shall be within these

limits; however, an analysis of each lot is not required. Upon request, the

manufacturer shall supply the results of an analysis for these elements on terms

previously agreed upon by the manufacturer and purchaser.

TABLE 3 Standard Sizes and Tolerances

Standard Size Tolerance

Friability

Rating

2 in. by down 10 % max retained on 2 in.

(50 mm) sieve

10 % max passing No. 8

(2.36 mm) sieve

⁄

in. by down 10 % max retained on

⁄

in. (12.5 mm) sieve

⁄

in. by down 10 % max retained on

⁄

in. (6.3 mm) sieve

8 mesh by down 10 % max retained on No.

8 (2.36 mm) sieve

20 mesh by

down

10 % max retained on No.

20 (0.85 mm) sieve

Speciﬁcations of sieve sizes used to deﬁne tolerances herein are as listed in

Speciﬁcation E11.

A550 − 16 (2025)

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned

in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk

of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ﬁve years and

if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards

and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the

responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should

make your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above

address or at 610-832-9585 (phone), or through the ASTM website (www.astm.org/contact). Permission rights to photocopy the

standard may also be secured from the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600;

http://www.copyright.com/

A550 − 16 (2025)

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摘要：

ASTM A550 - 16 (2025) 是铌铁（铁铌合金）的国际标准规格，由美国材料与试验协会（ASTM）发布。该标准涵盖了用于炼钢和铸造工业的铌铁合金的化学成分、物理要求、取样方法、试验程序以及交货验收条件。最新修订版（2025年）延续了2016年的技术框架，并进一步明确了铌、钽、铝、钛、硅等元素的含量限值，确保合金在微合金化钢、高强度低合金钢及不锈钢生产中发挥稳定的晶粒细化和析出强化作用。遵循本标准有助于提升产品质量一致性，促进国际贸易互认，并为冶金企业、采购商及质检机构提供统一的技术依

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