ASTM A826 - A 826M - 95 (2001)

VIP免费

Carl 2024-09-02 9 97.06KB 5 页 14星币

侵权投诉

Designation: A 826/A 826M – 95 (Reapproved 2001)

Standard Speciﬁcation for

Seamless Austenitic and Martensitic Stainless Steel Duct

Tubes for Liquid Metal-Cooled Reactor Core Components

This standard is issued under the ﬁxed designation A 826/A 826M; 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 (ε) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This speciﬁcation covers seamless, annealed or cold

worked, austenitic or martensitic stainless steel duct tubes of 2

to 7-in. [51 to 178 mm] outside dimensions with wall thickness

of 0.250 in. [6.35 mm] or less for use at high temperature in

liquid metal-cooled reactor plants.

1.2 The values stated in either inch-pound units or SI units

are to be regarded separately as standard. Within the text, the

SI units are shown in brackets. The values stated in each

system are not exact equivalents; therefore, each system must

be used independently of the other. Combining values from the

two systems may result in nonconformance with the speciﬁ-

cation.

1.3 This speciﬁcation and the applicable material speciﬁca-

tions are expressed in both inch-pound and SI units. However,

unless the order speciﬁes the applicable “M” speciﬁcation

designation (SI units), the material shall be furnished in

inch-pound units.

2. Referenced Documents

2.1 ASTM Standards:

A 370 Test Methods and Deﬁnitions for Mechanical Testing

of Steel Products

A 380 Practice for Cleaning and Descaling Stainless Steel

Parts, Equipment and Systems

A 450/A 450M Speciﬁcation for General Requirements for

Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes

A 751 Test Methods, Practices, and Terminology for

Chemical Analysis of Steel Products

D 129 Test Method for Sulfur in Petroleum Products (Gen-

eral Bomb Method)

D 808 Test Method for Chlorine in New and Used Petro-

leum Products (Bomb Method)

E 3 Methods of Preparation of Metallographic Specimens

E 29 Practice for Using Signiﬁcant Digits in Test Data to

Determine Conformance with Speciﬁcations

E 45 Practice for Determining the Inclusion Content of

Steel

E 112 Test Methods for Determining the Average Grain

Size

E 165 Test Method for Liquid Penetrant Examination

E 384 Test Method for Microhardness of Materials

E 407 Test Methods for Microetching Metals and Alloys

2.2 ANSI Standard:

B46.1 Surface Texture

2.3 ASME Standard:

NQA-1 Quality Assurance Program Requirements for

Nuclear Facilities

2.4 ASNT Standard:

SNT-TC-1A Recommended Practice for Nondestructive

Testing Personnel Qualiﬁcation and Certiﬁcation

3. Ordering Information

3.1 It is the responsibility of the purchaser to specify all

requirements that are necessary for the safe and satisfactory

performance of material ordered under this speciﬁcation.

Examples of such requirements include but are not limited to

the following:

3.1.1 Quantity (feet, metres, or number of lengths),

3.1.2 Name of material (seamless duct tubes),

3.1.3 Grade (Table 1),

3.1.4 Melting process (5.1),

3.1.5 Approval of procedures for conversion of ingot to bar

(5.2),

3.1.6 Thermomechanical treatment requirements (5.4),

3.1.7 Annealing and tempering requirements for martensitic

grades (5.4),

3.1.8 Condition (annealed, cold-worked, or thermomechani-

cal treatment) (5.6),

This speciﬁcation is under the jurisdiction of ASTM Committee A01 on Steel,

Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee

A01.10 on Stainless and Alloy Steel Tubular Products.

Current edition approved Nov. 10, 1995. Published January 1996. Originally

published as A 826 – 84. Last previous edition A 826 – 88.

Available from the American Society for Nondestructive Testing, 3200 River-

side Drive, Columbus, OH 43221.

Annual Book of ASTM Standards, Vol 01.03.

Annual Book of ASTM Standards, Vol 01.01.

Annual Book of ASTM Standards, Vol 05.01.

Annual Book of ASTM Standards, Vol 03.01.

Annual Book of ASTM Standards, Vol 14.02.

Annual Book of ASTM Standards, Vol 03.03.

Available from American National Standards Institute, 11 West 42nd St., 13th

Floor, New York, NY 10036.

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

3.1.9 Percent of cold-work (5.7),

3.1.10 Sublotting requirements (5.8),

3.1.11 Duct identiﬁcation requirements (5.9),

3.1.12 Archive samples requirements (5.11),

3.1.13 Other chemical requirements (6.1),

3.1.14 Tensile property requirements and number of tests

(7.1),

3.1.15 Microhardness measurement acceptance criteria, lo-

cations, and number of samples (7.2),

3.1.16 Dimensional data or applicable drawings (8.1),

3.1.17 Surface roughness limits (9.2),

3.1.18 Surface marring limits (9.3),

3.1.19 Cleaning procedures (9.4),

3.1.20 Grain size requirements for martensitic grades

(10.1),

3.1.21 Carbide and carbonitride inclusion rating require-

ments (10.2),

3.1.22 Inclusion rating requirements for martensitic grades

(10.2),

3.1.23 Penetrant examination requirements (11.1),

3.1.24 Lot qualiﬁcation sampling levels (12.1),

3.1.25 Packaging (15.1), and

3.1.26 Quality assurance documentation (see Supplemen-

tary Requirements).

4. General Requirements for Delivery

4.1 Material supplied under this speciﬁcation shall conform

to the applicable requirements of Speciﬁcation A 450/A 450M

unless otherwise speciﬁed herein.

5. Manufacture

5.1 Melting—Unless an alternative melting process has

been speciﬁed in the order, the process for austenitic grades

shall consist of a vacuum induction melt followed by a

consumable electrode vacuum-arc remelt. Additions of rare

earths during melting are prohibited unless approved by the

purchaser. The melting process for martensitic grades shall be

as speciﬁed in the order.

5.2 Ingot Processing—Procedures for converting ingots to

bars shall be approved by the purchaser prior to use if speciﬁed

in the order. The parameters for the conversion of austenitic

grades shall be selected to minimize the formation of complex

carbides and carbonitrides.

5.3 Tubemaking—Duct tube fabrication shall be made by a

seamless process that has been previously qualiﬁed as accept-

able.

5.4 Heat Treating:

5.4.1 Austenitic Grades—Annealing times and tempera-

tures shall be selected to ensure full carbide solution. Cooling

shall be performed at a rate rapid enough to prevent carbide

precipitation, unless a speciﬁc thermomechanical treatment is

speciﬁed in the order.

5.4.2 Martensitic Grades—Martensitic grades shall be an-

nealed and tempered as speciﬁed in the order.

5.5 Cleanliness During Manufacture—Before each heat

treatment and after each cutting operation prior to any reduc-

tion, duct tubes shall be cleaned in accordance with the

procedures of Recommended Practice A 380, and shall be

visually inspected after cleaning in accordance with 7.2.1 of

Recommended Practice A 380.

5.6 Condition—Duct tubes shall be furnished in the an-

nealed, cold-worked, or thermomechanical condition as speci-

ﬁed in the order.

5.7 Cold Work—Percent cold work shall be as speciﬁed in

the order and shall be based upon the reduction in transverse

area. Cold-worked duct tubes shall be cold worked to ﬁnished

size and delivered without further heat treatment. The cold-

working procedure shall be submitted to the purchaser for

review and approval prior to use.

5.7.1 Cold Work Determination—Calculate percent cold

work as follows:

CW =[A

−A

]3100

where:

CW = percent cold work,

= duct tube cross-sectional area prior to ﬁnal cold-work,

and

= duct tube cross-sectional area after ﬁnal cold-work.

5.8 Lot Size—Duct tubes shall be grouped into rational

inspection lots that can be characterized by lot qualiﬁcation

sampling. This shall be done on the basis of items of the same

nominal dimensions produced from the same heat, processed

consecutively, and annealed under identical parameters. Any

sublotting shall be as speciﬁed in the order.

5.9 Identiﬁcation—Duct tubes shall be marked and pro-

cessed in a manner that will ensure individual duct tube

identity and traceability to both heat and lot numbers. Each

duct tube shall be identiﬁed with the supplier code, lot code,

heat number, alloy, purchase order number, and a sequential

identiﬁcation number as speciﬁed in the order. Duct tubes shall

be marked using an electrolytic etching procedure approved by

the purchaser.

5.10 Repair and Rework—Reworked duct tubes shall meet

the requirements of this speciﬁcation. Repair shall be permitted

only after prior approval by the purchaser.

TABLE 1 Chemical Requirements of Duct Tubes

Grade

UNS Designation

TP 316

S 31600

...

S38660

...

S42100

Carbon 0.040–0.060 0.030–0.050 0.17–0.23

Manganese 1.00–2.00 1.65–2.35 0.40–0.70

Phosphorus, max 0.040 0.040 0.040

Sulfur, max 0.010 0.010 0.010

Silicon 0.50–0.75 0.50–1.00 0.20–0.30

Nickel 13.0–14.0 14.5–16.5 0.30–0.80

Chromium 17.0–18.0 12.5–14.5 11.0–12.5

Molybdenum 2.00–3.00 1.50–2.50 0.80–1.20

Titanium . . . 0.10–0.40

...

Columbium 0.050 max 0.050 max 0.050 max

Tantalum, max 0.020 0.020 . . .

Tungsten . . . . . . 0.40–0.60

Nitrogen 0.010 max 0.005 max . . .

Aluminum, max 0.050 0.050 0.050

Arsenic, max 0.030 0.030 . . .

Boron, max 0.0020 0.0020 . . .

Cobalt, max 0.050 0.050 . . .

Copper, max 0.04 0.04 . . .

Vanadium 0.05 max 0.05 max 0.25–0.35

Aim for 0.25

A 826/A 826M – 95 (2001)

5.11 Archive Samples—Archive samples shall be supplied

as speciﬁed in the order.

6. Chemical Composition

6.1 The material shall conform to the applicable chemical

requirements speciﬁed in Table 1, unless otherwise speciﬁed in

the order.

6.2 An analysis of each heat of steel shall be made by the

steel manufacturer in accordance with Methods, Practices, and

Deﬁnitions A 751 to determine the percentages of the elements

speciﬁed. If the secondary melting processes are employed, the

heat analysis shall be obtained from one remelted ingot or the

product of one remelted ingot of each primary melt. The

chemical composition thus determined, or that determined

from a product analysis made by the tubular product manufac-

turer, shall be reported to the purchaser or the purchaser’s

representative and shall conform to the requirements speciﬁed

in 6.1.

6.3 An analysis shall be made on one ﬁnished duct tube

fabricated from each heat of steel. The chemical composition

thus determined, shall conform to the requirements speciﬁed in

6.1.

7. Mechanical Properties

7.1 Tensile Properties—Room temperature tensile proper-

ties of 20 % cold-worked Type 316 stainless steel duct tubes

shall be determined in accordance with Speciﬁcation A 450.

Unless otherwise speciﬁed in the order, the requirements of

Table 2 are for information only. Tensile properties of other

grades and conditions and number of tests shall be speciﬁed in

the order as required by the purchaser.

7.2 Hardness—The Vickers hardness shall be determined

on samples of ﬁnished duct tubes in accordance with Test

Method E 384 using a 500-g load. The acceptance criteria,

number of samples, and measurement locations shall be as

speciﬁed in the order.

8. Dimensions

8.1 Dimensional requirements shall be as speciﬁed in the

order. The rounding-off method deﬁned in Practice E 29 shall

be used for determining conformance with these requirements.

8.2 Equipment/Technique Accuracy — Dimensional mea-

surements shall be made with a device measuring in units no

greater than 10 % of the speciﬁed tolerance range. For limits

speciﬁed as minimum or maximum, use a device measuring in

units to one decimal place beyond the character speciﬁed.

Alternative measuring equipment shall require approval by the

purchaser.

9. Surface Requirements

9.1 Surface Condition—The ﬁnished duct tubes shall be

free of visible oxide, scale, splits, laps, cracks, seams, and

inclusions.

9.2 Surface Roughness—All surfaces of ﬁnished duct tubes

shall meet the limits speciﬁed in the order. Surfaces shall be

examined visually and compared with roughness comparison

specimens, or alternatively, measured with surface roughness

measuring instruments. Roughness comparison specimens and

roughness measurement instruments shall meet the require-

ments of ANSI B 46.1.

9.3 Surface Marring—Rejection criteria for surface imper-

fections, such as scratches, handling marks, light mandrel, and

die or roll marks, shall be as speciﬁed in the order. The bottom

of surface defects shall be visible, rounded, and well faired-in

as conﬁrmed by visual inspection. Removal of surface defects

by grinding, buffing, or polishing is considered a repair subject

to the requirements of 5.10.

9.4 Cleaning—All cleaning operations shall be conducted

in accordance with the procedures meeting the requirements of

Recommended Practice A 380 and shall be approved by the

purchaser. Cleaned surfaces shall be inspected visually and by

instrumental methods in accordance with Section 7 on Inspec-

tion After Cleaning of Recommended Practice A 380, as

speciﬁed in the order. Measures to prevent the recontamination

of cleaned surfaces shall be taken as soon as ﬁnal cleaning is

completed, and shall be maintained during all subsequent

fabrication, inspection, storage, and shipping operations.

10. Metallographic Test Requirements

10.1 Grain Size—The recrystallized average grain size of

austenitic grade duct materials from any lot following ﬁnal

anneal and prior to cold working shall be 4 to 7, as determined

in accordance with Methods E 112, Reference Plate II, and

shall exhibit no evidence of a duplex structure. The grain size

of martensitic grade duct materials shall be as speciﬁed in the

order.

10.2 Inclusions—The inclusion rating of the austenitic

grade starting bar, when determined in accordance with Mi-

croscopical Method D of Practice E 45, shall be limited to one

for each of the following four types of inclusions: (A) Sulﬁde

Type, (B) Alumina Type, (C) Silicate Type, and (D) Globular

Oxide Type. The ﬁeld of the samples shall be rated by

comparison with Plate III of Practice E 45. A maximum of

10 % of the ﬁelds may show inclusions at the next higher

density to that speciﬁed, and a maximum of 1 % of the ﬁelds

may show inclusions at the second higher density. Complex

carbide and carbonitride inclusion ratings shall be as speciﬁed

in the order. The inclusion rating of martensitic grade starting

bars shall be as speciﬁed in the order.

10.3 Intergranular Attack—Specimens from ﬁnished duct

tubes shall be prepared in accordance with Methods E 3 and

shall be metallographically examined at 1003to verify free-

dom from intergranular attack.

10.4 Carbide Precipitation—Specimens from ﬁnished aus-

tenitic grade duct tubes shall be mounted as transverse sec-

tions, polished, etched, and examined at 5003. Specimen

preparation shall be as described in Methods E 3 using etching

TABLE 2 Room Temperature Tensile Requirements for Duct

Tubes

Alloy Tensile Strength,

min, ksi [MPa]

Yield Strength,

min, ksi [MPa]

Minimum Total

Elongation, %

TP 316 100 [689] 85 [586] 15

S38660

100 [689] 85 [586] 15

S42100

100 [689] 70 [483] 15

20 % cold-worked

Tempered

A 826/A 826M – 95 (2001)

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 VIP免费下载

摘要：

ASTM A826 - A 826M - 95 (2001) 是一项关于铁素体不锈钢管材的标准规范，主要适用于核电站和其他高温高压环境中使用的无缝与焊接奥氏体不锈钢管。该标准最初于1995年发布，后在2001年重新确认并沿用其技术要求，涵盖了材料化学成分、机械性能、热处理工艺、尺寸公差及无损检测等关键指标。对于从事核电、石油化工及高温管道系统的工程师、采购人员和质检人员而言，掌握ASTM A826标准有助于确保管材在高温、高压及腐蚀性环境下的安全性与可靠性。标准中明确规定了管子需进行的拉伸试验、

展开>> 收起<<

ASTM A826 - A 826M - 95 (2001).pdf

共5页,预览4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 A826 - A 826M - 95 (2001)

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: