ASTM B468 - 10 (2020)

免费

Carl 2024-09-02 11 74.54KB 2 页免费

Designation: B468 −10 (Reapproved 2020)
Standard Speciﬁcation for
Welded UNS N08020 Alloy Tubes
1
This standard is issued under the ﬁxed designation B468; 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
2
covers welded UNS N08020 alloy
boiler, heat exchanger, and condenser tubes for general
corrosion-resisting and low- or high-temperature service.
1.2 This speciﬁcation covers tubes
1
⁄
8
to 5 in. (3.18 to 127
mm), inclusive, in outside diameter and 0.015 to 0.500 in. (0.38
to 12.70 mm), inclusive, in wall thickness. Table 2 of Speciﬁ-
cation B751 lists the dimensional requirements of these sizes.
Tubes having other dimensions may be furnished provided
such tubing complies with all other requirements of this
speciﬁcation.
1.3 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.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to become familiar
with all hazards including those identiﬁed in the appropriate
Safety Data Sheet (SDS) for this product/material as provided
by the manufacturer, to establish appropriate safety, health,
and environmental practices, and determine the applicability
of regulatory limitations prior to use.
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
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:
3
A262 Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
B751 Speciﬁcation for General Requirements for Nickel and
Nickel Alloy Welded Tube
B899 Terminology Relating to Non-ferrous Metals and Al-
loys
3. Terminology
3.1 Deﬁnitions—Deﬁnitions for terms deﬁned in Terminol-
ogy B899 shall apply unless otherwise deﬁned by the require-
ments of this document.
4. General Requirements
4.1 Material furnished in accordance with this speciﬁcation
shall conform to the applicable requirements of the current
edition of Speciﬁcation B751 unless otherwise provided
herein.
5. Ordering Information
5.1 It is the responsibility of the purchaser to specify all
requirements that are necessary for material ordered under this
speciﬁcation. Examples of such requirements include, but are
not limited to, the following:
5.1.1 Quantity (feet or number of lengths),
5.1.2 UNS number,
5.1.3 Size (outside diameter and minimum or average wall
thickness),
5.1.4 Length (random or speciﬁc),
5.1.5 ASTM designation,
5.1.6 Product Analysis—State if required,
5.1.7 Certiﬁcation—State if a certiﬁcation or a report of test
results is required,
5.1.8 Purchaser Inspection—State which tests or inspec-
tions are to be witnessed, if any, and
5.1.9 Supplementary requirements, if any.
6. Materials and Manufacture
6.1 The tubing shall be made from ﬂat-rolled stock by an
automatic welding process with no addition of ﬁller metal.
Subsequent to welding and prior to ﬁnal heat treatment, the
material shall be cold-worked in either the weld metal only, or
in both the weld and base metal.
6.2 Heat Treatment—Tubing of UNS N08020 alloy shall be
furnished in the stabilized-annealed condition.
1
This speciﬁcation is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Reﬁned Nickel and Cobalt and Their Alloys.
Current edition approved Oct. 1, 2020. Published October 2020. Originally
approved in 1968. Last previous edition approved in 2016 as B468 – 10 (2016).
DOI: 10.1520/B0468-10R20.
2
For ASME Boiler and Pressure Vessel Code applications, see related Speciﬁ-
cation SB-468 in Section II of that code.
3
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.
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.

NOTE 1—The recommended annealing temperatures are 1800 to 1850°F

(982 to 1010°C) for UNS N08020.

7. Chemical Composition

7.1 The material shall conform to the composition limits

speciﬁed in Table 1. One test is required for each lot as deﬁned

in Speciﬁcation B751.

7.2 If a product analysis is performed, it shall meet the

chemistry limits prescribed in Table 1, subject to the analysis

tolerances speciﬁed in Table 6 of Speciﬁcation B751.

8. Mechanical Properties and Other Requirements

8.1 Mechanical Properties—The material shall conform to

the mechanical property requirements speciﬁed in Table 2. One

test is required for each lot as deﬁned in Speciﬁcation B751.

8.2 Flattening Test—A ﬂattening test shall be made on each

end of one tube per lot. Superﬁcial ruptures resulting from

surface imperfections shall not be cause for rejection.

8.3 Flange Test—A ﬂange test shall be made on each end of

one tube per lot.

8.4 Nondestructive Test Requirements—Each tube shall be

subjected to either a pressure test or a nondestructive electric

test at the manufacturer’s option. The purchaser may specify

which test is to be used.

9. Keywords

9.1 welded tube; N08020

SUPPLEMENTARY REQUIREMENTS

The following supplementary requirements shall be applied only when speciﬁed by the purchaser

in the inquiry, contract, or order:

S1. Corrosion Tests

S1.1 One intergranular corrosion test per lot shall be per-

formed by the manufacturer on a sensitized specimen and

tested in accordance with Practices A262. When this supple-

mentary requirement is speciﬁed, the speciﬁc practice (Practice

B or Practice E) shall also be speciﬁed. If Practice B is

speciﬁed, the specimen must pass with a rate of less than 0.002

in. (0.05 mm) per month. A lot for intergranular corrosion

testing shall be the same as for mechanical testing.

S1.1.1 In addition to the anneal recommended in Note 1, the

specimen shall be sensitized for1hat1250°F (677°C) before

being subjected to corrosion testing.

S1.1.2 If any corrosion test specimen fails the test, the

material represented by such specimens may be reheat-treated

and resubmitted for test.

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), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website

(www.astm.org). 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/

TABLE 1 Chemical Requirements

Element Composition,%

UNS N08020

Carbon, max 0.07

Manganese, max 2.00

Phosphorus,

max

0.045

Sulfur, max 0.035

Silicon, max 1.00

Nickel 32.00–38.00

Chromium 19.00–21.00

Molybdenum 2.00–3.00

Copper 3.00–4.00

Columbium

(Nb) +

8 × carbon–1.00

tantalum

Nitrogen ...

Iron

remainder

By difference.

TABLE 2 Mechanical Property Requirements

Tensile Strength,

min, ksi (MPa)

Yield Strength,

min, ksi (MPa)

Elongation in 2 in.

(50.8 mm), min, %

80 (551) 35 (241) 30.0

B468 − 10 (2020)

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

亲，本站95%以上的标准规范都面向会员免费，办理VIP会员下载更省钱，平均每篇不到2元

立即下载

已全部加载

摘要：

ASTM B468 - 10 (2020) 是国际材料与试验协会（ASTM）发布的关于焊接和拉制无缝铬-镍-铁合金（UNS N08810 及 UNS N08811）管材的标准规范。该标准主要适用于高温和腐蚀性环境下的锅炉、过热器及热交换器用管材，涵盖无缝管和焊接管的生产要求、化学成分、力学性能、热处理工艺及尺寸公差等关键指标。最新2020版本延续了2010年版本的技术要求，并维持了对延展性、耐应力腐蚀开裂性能及高温强度的严格规定。本规范常用于石化、核电及化工行业，确保管道在极端工况下的安全性与可

展开>> 收起<<

ASTM B468 - 10 (2020).pdf

共2页,预览2页

还剩页未读，继续阅读

声明：本文档系会员上传，若文档所含内容侵犯了您的版权或隐私，请立即通知，我们立即给予侵权申诉删除！

ASTM B468 - 10 (2020)

相关推荐

开通VIP享超值会员特权

相关内容

热门标签

举报选择: