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Designation: A 193/A 193M – 06a

Standard Speciﬁcation for

Alloy-Steel and Stainless Steel Bolting Materials for High

Temperature or High Pressure Service and Other Special

Purpose Applications

This standard is issued under the ﬁxed designation A 193/A 193M; 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.

This standard has been approved for use by agencies of the Department of Defense.

1. Scope*

1.1 This speciﬁcation

covers alloy and stainless steel bolt-

ing material for pressure vessels, valves, ﬂanges, and ﬁttings

for high temperature or high pressure service, or other special

purpose applications. The term bolting material as used in this

speciﬁcation covers bars, bolts, screws, studs, stud bolts, and

wire. Bars and wire shall be hot-wrought. The material may be

further processed by centerless grinding or by cold drawing.

Austenitic stainless steel may be carbide solution treated or

carbide solution treated and strain-hardened. When strain

hardened austenitic steel is ordered, the purchaser should take

special care to ensure that

Appendix X1 is thoroughly under-

stood.

1.2 Several grades are covered, including ferritic steels and

austenitic stainless steels designated B5, B8, and so forth.

Selection will depend upon design, service conditions, me-

chanical properties, and high temperature characteristics.

NOTE 1—The committee formulating this speciﬁcation has included

ﬁfteen steel types that have been rather extensively used for the present

purpose. Other compositions will be considered for inclusion by the

committee from time to time as the need becomes apparent.

OTE 2—For grades of alloy-steel bolting material suitable for use at

the lower range of high temperature applications, reference should be

made to Speciﬁcation

A 354.

OTE 3—For grades of alloy-steel bolting material suitable for use in

low temperature applications, reference should be made to Speciﬁcation

A 320/A 320M.

1.3 Nuts for use with this bolting material are covered in

Section 14.

1.4 Supplementary Requirements S1 through S10 are pro-

vided for use when additional tests or inspection are desired.

These shall apply only when speciﬁed in the purchase order.

1.5 This speciﬁcation is expressed in both inch-pound units

and in SI units. However, unless the order speciﬁes the

applicable M speciﬁcation designation (SI units), the material

shall be furnished to inch-pound units.

1.6 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.

2. Referenced Documents

2.1 ASTM Standards:

A 153/A 153M Speciﬁcation for Zinc Coating (Hot-Dip) on

Iron and Steel Hardware

A 194/A 194M Speciﬁcation for Carbon and Alloy Steel

Nuts for Bolts for High Pressure or High Temperature

Service, or Both

A 320/A 320M Speciﬁcation for Alloy-Steel and Stainless

Steel Bolting Materials for Low-Temperature Service

A 354 Speciﬁcation for Quenched and Tempered Alloy

Steel Bolts, Studs, and Other Externally Threaded Fasten-

ers

A 788/A 788M Speciﬁcation for Steel Forgings, General

Requirements

A 962/A 962M Speciﬁcation for Common Requirements

for Steel Fasteners or Fastener Materials, or Both, Intended

for Use at Any Temperature from Cryogenic to the Creep

Range

B 633 Speciﬁcation for Electrodeposited Coatings of Zinc

on Iron and Steel

B 695 Speciﬁcation for Coatings of Zinc Mechanically

Deposited on Iron and Steel

B 696 Speciﬁcation for Coatings of Cadmium Mechanically

Deposited

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

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

A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting

Materials for Piping and Special Purpose Applications.

Current edition approved March 1, 2006. Published March 2006. Originally

approved in 1936. Last previous edition approved in 2006 as A 193/A 193M-06.

For ASME Boiler and Pressure Vessel Code applications, see related Speciﬁ-

cation SA-193 in Section II of that Code.

For referenced ASTM standards, visit the ASTM website, www.astm.org, or

contact ASTM Customer Service at [email protected]. For Annual Book of ASTM

Standards volume information, refer to the standard’s Document Summary page on

the ASTM website.

*A Summary of Changes section appears at the end of this standard.

Reproduction authorized per License Agreement with Monique Tyree (ASTMIHS Account); Mon Apr 3 16:10:58 EDT 2006

Provided by IHS under license with ASTM

Not for Resale

No reproduction or networking permitted without license from IHS

--`,,```,,,,````-`-`,,`,,`,`,,`---

B 766 Speciﬁcation for Electrodeposited Coatings of Cad-

mium

E18 Test Methods for Rockwell Hardness and Rockwell

Superﬁcial Hardness of Metallic Materials

E21 Test Methods for Elevated Temperature Tension Tests

of Metallic Materials

E112 Test Methods for Determining Average Grain Size

E 139 Test Methods for Conducting Creep, Creep-Rupture,

and Stress-Rupture Tests of Metallic Materials

E 150 Recommended Practice for Conducting Creep and

Creep-Rupture Tension Tests of Metallic Materials Under

Conditions of Rapid Heating and Short Times

E 151 Recommended Practice for Tension Tests of Metallic

Materials at Elevated Temperatures With Rapid Heating

and Conventional or Rapid Strain Rates

E 292 Test Methods for Conducting Time-for-Rupture

Notch Tension Tests of Materials

E 328 Test Methods for Stress Relaxation for Materials and

Structures

E 381 Method of Macroetch Testing Steel Bars, Billets,

Blooms, and Forgings

E 566 Practice for Electromagnetic (Eddy-Current) Sorting

of Ferrous Metals

E 709 Guide for Magnetic Particle Examination

E 606 Practice for Strain-Controlled Fatigue Testing

2.2 ANSI Standards:

B1.1 Screw Threads

B18.2.1 Square and Hex Bolts and Screws

B18.2.3.1M Metric Hex Cap Screws

B18.3 Hexagon Socket and Spline Socket Screws

B18.3.1M Metric Socket Head Cap Screws

2.3 AIAG Standard:

AIAG B-5 02.00 Primary Metals Identiﬁcation Tag Appli-

cation Standard

3. General Requirements and Ordering Information

3.1 The inquiry and orders shall include the following, as

required, to describe the desired material adequately:

3.1.1 Heat-treated condition (that is, normalized and tem-

pered, or quenched and tempered, for the ferritic materials, and

carbide solution treated (Class 1), carbide solution treated after

ﬁnishing (Class 1A), and carbide solution treated and strain-

hardened (Classes 2, 2B and 2C), for the austenitic stainless

steels; Classes 1B and 1C apply to the carbide solution-treated

nitrogen-bearing stainless steels; Class 1D applies to material

carbide solution treated by cooling rapidly from the rolling

temperature),

3.1.2 Description of items required (that is, bars, bolts,

screws, or studs),

3.1.3 Nuts, if required by purchaser, in accordance with

14.1,

3.1.4 Supplementary requirements, if any, and

3.1.5 Special requirements, in accordance with 7.3, 7.5.1,

11.2, 15.1, and 16.1.

3.2 Coatings—Coatings are prohibited unless speciﬁed by

the purchaser (See Supplementary Requirement S13). When

coated fasteners are ordered the purchaser should take special

care to ensure that

Appendix X2 is thoroughly understood.

4. Common Requirements

4.1 Material and fasteners supplied to this speciﬁcation shall

conform to the requirements of Speciﬁcation

A 962/A 962M.

These requirements include test methods, ﬁnish, thread dimen-

sions, marking, certiﬁcation, optional supplementary require-

ments, and others. Failure to comply with the requirements of

Speciﬁcation

A 962/A 962M constitutes nonconformance with

this speciﬁcation. In case of conﬂict between this speciﬁcation

and Speciﬁcation

A 962/A 962M, this speciﬁcation shall pre-

vail.

5. Manufacture (Process)

5.1 The steel shall be produced by any of the following

processes: open-hearth, basic-oxygen, electric-furnace, or

vacuum-induction melting (VIM). The molten steel may be

vacuum-treated prior to or during pouring of the ingot or strand

casting.

5.2 Quality—See Speciﬁcation

A 962/A 962M for require-

ments.

6. Discard

6.1 A sufficient discard shall be made to secure freedom

from injurious piping and undue segregation.

7. Heat Treatment

7.1 Ferritic steels shall be properly heat treated as best suits

the high temperature characteristics of each grade. Immedi-

ately after rolling or forging, the bolting material shall be

allowed to cool to a temperature below the cooling transfor-

mation range. The materials which are to be furnished in the

liquid-quenched condition shall then be uniformly reheated to

the proper temperature to reﬁne the grain (a group thus

reheated being known as a quenching charge) and quenched in

a liquid medium under substantially uniform conditions for

each quenching charge. Use of water quenching is prohibited

for any ferritic grade when heat treatment is part of the fastener

manufacturing process. This prohibition does not apply to heat

treated bar or to fasteners machined therefrom. The materials

that are to be furnished in the normalized or air-quenched

condition shall be reheated to the proper temperature to reﬁne

the grain and cooled uniformly in air to a temperature below

the transformation temperature range. The material, whether

liquid-quenched or normalized, shall then be uniformly re-

heated for tempering. The minimum tempering temperature

shall be as speciﬁed in

Table 2 and Table 3.

Withdrawn.

Available from American National Standards Institute (ANSI), 25 W. 43rd St.,

4th Floor, New York, NY 10036.

Available from Automotive Industry Action Group, 26200 Lahser, Suite 200,

Southﬁeld, MI 48034.

A 193/A 193M – 06a

Reproduction authorized per License Agreement with Monique Tyree (ASTMIHS Account); Mon Apr 3 16:10:58 EDT 2006

Provided by IHS under license with ASTM

Not for Resale

No reproduction or networking permitted without license from IHS

--`,,```,,,,````-`-`,,`,,`,`,,`---

TABLE 1 Chemical Requirements (Composition, percent)

Type......... Ferritic Steels

Grade........ B5 B6andB6X

UNS Designation ........ 5%Chromium 12%Chromium

S 41000 (410)

Range Product Variation, Range Product Variation

Over or Under

Carbon 0.10 min 0.01 under 0.08–0.15 0.01 over

Manganese, max 1.00 0.03 over 1.00 0.03 over

Phosphorus, max 0.040 0.005 over 0.040 0.005 over

Sulfur, max 0.030 0.005 over 0.030 0.005 over

Silicon 1.00 max 0.05 over 1.00 max 0.05 over

Chromium 4.0–6.0 0.10 11.5–13.5 0.15

Molybdenum 0.40–0.65 0.05 . . . . . .

Type.......... Ferritic Steels

Grade...... B7,B7M B16

Description ......... Chromium-Molybdenum

Chromium-Molybdenum-Vanadium

Product Variation, Product Variation,

Range Over or Under

Carbon 0.37–0.49

0.02 0.36–0.47 0.02

Manganese 0.65–1.10 0.04 0.45–0.70 0.03

Phosphorus, max 0.035 0.005 over 0.035 0.005 over

Sulfur, max 0.040 0.005 over 0.040 0.005 over

Silicon 0.15–0.35 0.02 0.15–0.35 0.02

Chromium 0.75–1.20 0.05 0.80–1.15 0.05

Molybdenum 0.15–0.25 0.02 0.50–0.65 0.03

Vanadium . . . . . . 0.25–0.35 0.03

Aluminum, max %

... ... 0.015 ...

Type Austenitic Steels,

Classes 1, 1A, 1D, and 2

Grade . . B8, B8A B8C, B8CA B8M, B8MA, B8M2, B8M3 B8P, B8PA

UNS Designation ...... S30400 (304) S 34700 (347) S 31600 (316) S 30500

Range

Product Variation,

Over or Under

Range

Product Variation,

Over or Under

Range

Product Variation,

Over or Under

Range

Product Variation,

Over or Under

Carbon, max 0.08 0.01 over 0.08 0.01 over 0.08 0.01 over 0.12 0.01 over

Manganese, max 2.00 0.04 over 2.00 0.04 over 2.00 0.04 over 2.00 0.04 over

Phosphorus, max 0.045 0.010 over 0.045 0.010 over 0.045 0.010 over 0.045 0.010 over

Sulfur, max 0.030 0.005 over 0.030 0.005 over 0.030 0.005 over 0.030 0.005 over

Silicon, max 1.00 0.05 over 1.00 0.05 over 1.00 0.05 over 1.00 0.05 over

Chromium 18.0–20.0 0.20 17.0–19.0 0.20 16.0–18.0 0.20 17.0–19.0 0.20

Nickel 8.0–11.0 0.15 9.0–12.0 0.15 10.0–14.0 0.15 11.0–13.0 0.15

Molybdenum . . . . . . . . . . . . 2.00–3.00 0.10 . . . . . .

Columbium + . . . . . . 10 x carbon 0.05 under . . . . . . . . . . . .

tantalum content, min;

1.10 max

Type.......... Austenitic Steels,

Classes 1A, 1B, 1D, and 2

Grade..... B8N, B8NA B8MN, B8MNA B8MLCuN, B8MLCuNA

UNS Designation .......... S30451 (304N) S 31651 (316N) S 31254

Range

Product Variation,

Over or Under

Range

Product Variation,

Over or Under

Range

Carbon, max 0.08 0.01 over 0.08 0.01 over 0.020

Manganese, max 2.00 0.04 over 2.00 0.04 over 1.00

Phosphorus, max 0.045 0.010 over 0.045 0.010 over 0.030

Sulfur, max 0.030 0.005 over 0.030 0.005 over 0.010

Silicon, max 1.00 0.05 over 1.00 0.05 over 0.80

Chromium 18.0–20.0 0.20 16.0–18.0 0.20 19.5–20.5

Nickel 8.0–11.0 0.15 10.0–13.0 0.15 17.5–18.5

Molybdenum . . . . . . 2.00–3.00 0.10 6.0–6.5

Nitrogen 0.10–0.16 0.01 0.10–0.16 0.01 0.18–0.22

Copper . . . . . . . . . . . . 0.50–1.00

A 193/A 193M – 06a

Reproduction authorized per License Agreement with Monique Tyree (ASTMIHS Account); Mon Apr 3 16:10:58 EDT 2006

Provided by IHS under license with ASTM

Not for Resale

No reproduction or networking permitted without license from IHS

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