ASTM B370-12(2019)

Standard Specification for Copper Sheet and Strip for Building Construction

ABSTRACT
This specification establishes the requirements for rolled copper sheets and strips in flat lengths or coils of ounce-weight thicknesses for roofing, flashing, gutters, downspouts, and general sheet metal work in building construction. Products produced to this specification are not intended for electrical applications. Materials are available in the following tempers: O60 (soft), H00 (cold-rolled), H01 (cold-rolled, high yield), H02 (half hard), H03 (three-quarter hard), and H04 (hard). Products shall be sampled and prepared, then tested accordingly to examine their conformance to dimensional (mass, thickness, length, width, weight, and straightness), mechanical (tensile and yield strength, and Rockwell hardness), chemical composition, and grain recrystallization requirements.
SCOPE
1.1 This specification establishes the requirements for rolled copper sheet and strip in flat lengths or coils in ounce-weight thicknesses for roofing, flashing, gutters, downspouts, and general sheet metal work in building construction.  
1.1.1 Products produced to this specification are not intended for electrical applications.  
1.2 Units—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.
Note 1: Specification B101 is an associated specification for lead-coated copper sheets and strip for building construction.  
1.3 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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2019
• ICS: 77.150.30 - Copper products
• Technical Committee: B05 - Copper and Copper Alloys
• Drafting Committee: B05.01 - Plate, Sheet, and Strip

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:B370 −12 (Reapproved 2019)
Standard Specification for
Copper Sheet and Strip for Building Construction
This standard is issued under the fixed designation B370; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* B601 ClassificationforTemperDesignationsforCopperand
Copper Alloys—Wrought and Cast
1.1 Thisspecificationestablishestherequirementsforrolled
B846 Terminology for Copper and Copper Alloys
copper sheet and strip in flat lengths or coils in ounce-weight
E3 Guide for Preparation of Metallographic Specimens
thicknesses for roofing, flashing, gutters, downspouts, and
E8/E8M Test Methods for Tension Testing of Metallic Ma-
general sheet metal work in building construction.
terials
1.1.1 Products produced to this specification are not in-
E112 Test Methods for Determining Average Grain Size
tended for electrical applications.
E255 Practice for Sampling Copper and Copper Alloys for
1.2 Units—The values stated in inch-pound units are to be
the Determination of Chemical Composition
regarded as standard. The values given in parentheses are
E478 Test Methods for ChemicalAnalysis of CopperAlloys
mathematical conversions to SI units that are provided for
information only and are not considered standard.
3. General Requirements
NOTE 1—Specification B101 is an associated specification for lead-
3.1 The following sections of Specification B248 constitute
coated copper sheets and strip for building construction.
a part of this specification:
1.3 This standard does not purport to address all of the
3.1.1 Terminology;
safety concerns, if any, associated with its use. It is the 3.1.2 Materials and Manufacture;
responsibility of the user of this standard to establish appro-
3.1.3 Workmanship, Finish, and Appearance;
priate safety, health, and environmental practices and deter- 3.1.4 Specimen Preparation;
mine the applicability of regulatory limitations prior to use.
3.1.5 Test Methods;
1.4 This international standard was developed in accor- 3.1.6 Significance of Numerical Limits;
dance with internationally recognized principles on standard-
3.1.7 Inspection;
ization established in the Decision on Principles for the
3.1.8 Certification;
Development of International Standards, Guides and Recom-
3.1.9 Mill Test Report;
mendations issued by the World Trade Organization Technical
3.1.10 Packaging and Package Marking; and
Barriers to Trade (TBT) Committee.
3.1.11 Supplementary Requirements.
3.2 In addition, when a section with a title identical to that
2. Referenced Documents
referenced in 3.1, above, appears in this specification, it
2.1 ASTM Standards:
contains additional requirements, which supplement those
B101 Specification for Lead-Coated Copper Sheet and Strip
appearing in Specification B248.
for Building Construction
B248 Specification for General Requirements for Wrought
4. Terminology
Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled
4.1 Definitions:
Bar
4.1.1 For definitions of terms related to copper and copper
alloys, refer to Terminology B846.
1 4.1.2 coil, n—a length of the product wound into a series of
ThisspecificationisunderthejurisdictionofASTMCommitteeB05onCopper
andCopperAlloysandisthedirectresponsibilityofSubcommitteeB05.01onPlate, connected turns.
Sheet, and Strip.
4.1.2.1 Discussion—The unqualified term “coil” as applied
Current edition approved Oct. 1, 2019. Published October 2019. Originally
to “flat product” usually refers to a coil in which the product is
approved in 1961. Last previous edition approved in 2012 as B370–12. DOI:
spirally wound, with the successive layers on top of one
10.1520/B0370–12R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
another (sometimes called a “roll”).
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.1.3 lengths, mill, n—straight lengths, including ends, that
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. are be manufactured conveniently in the mills.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B370−12 (2019)
TABLE 1 Thickness Tolerances of Sheet and Strip TABLE 2 Thickness Tolerances of Sheet and Strip to be Coated
for Flashing
Tolerances, Plus
Theoretical
2 A
Ounce-Weight/ft and Minus
Thickness, in. Tolerances,
Theoretical
(mm) A
in. (mm)
Ounce-Weight/ft Plus and Minus
Thickness,
in. (mm) in. (mm)
6 0.0081 (0.206) 0.001 (0.026)
2 0.0027 (0.068) 0.0004 (0.010)
8 0.0108 (0.274) 0.0011 (0.028)
3 0.004 (0.103) 0.0005 (0.013)
10 0.0135 (0.343) 0.0011 (0.028)
4 0.0054 (0.138) 0.0006 (0.0152)
12 0.0162 (0.411) 0.0012 (0.030)
5 0.0067 (0.171) 0.0006 (0.0152)
16 0.0216 (0.549) 0.0012 (0.031)
A 3 3
20 0.0270 (0.686) 0.0012 (0.031)
Based on a density of 0.322 lb/in. (8.91 g/cm ).
24 0.0323 (0.820) 0.0015 (0.038)
32 0.0431 (1.09) 0.002 (0.05)
48 0.0646 (1.64) 0.0025 (0.06)
A 3 3
Based on a density of 0.322 lb/in. (8.91 g/cm ).
6.2.2 Strip—The product shall be manufactured in flat
lengths or in coils (rolls) of one single continuous length not
less than 25 ft (7.5 m) wound into a cylindrical spiral.
4.1.3.1 Discussion—Full length pieces usually are 8 or 10 ft
(2.4 or 3.0 m) and subject to established length tolerances.
7. Chemical Composition
4.1.4 length, stock, n—straight lengths that are mill cut and
7.1 The material shall be any copper with a minimum
stored in advance of orders.
copper content, including silver, of 99.5 %.
4.1.4.1 Discussion—They usually are 8 or 10 ft (2.4 or 3.0
7.1.1 Limits shall be established and analysis required for
m) and subject to established length tolerances.
unnamed elements by agreement between the manufacturer
4.1.5 ounce-weight, n—the weight of copper sheet or strip
and the purchaser.
expressed in ounces per square foot.
8. Temper
4.1.6 sheet, for building construction, n—a rolled flat prod-
uct over 24 in. (610 mm) in width and of ounce-weight
8.1 The standard tempers for products described in this
thickness from 8 to 48 oz.
specification are given in Table 3.
4.1.7 strip, for building construction, n—a rolled flat prod-
8.2 Cold Rolled tempers as defined in Classification B601:
uct up to 24 in. (610 mm), inclusive, in width and of
H00 (cold-rolled), H01 (cold-rolled, high yield), H02 (half
ounce-weight thickness from 8 to 48 oz.
hard), H03 (three-quarter hard), and H04 (hard).
NOTE 2—In 4.1.6 and 4.1.7, the 8 to 48 oz refers to the names
8.3 Annealed temper as defined in Classification B601: O60
commonly used in the building industry for the sizes used. The respective
(soft)
sizes that correspond to these names are listed in Table 1.
NOTE 3—The purchaser should confer with the manufacturer or
5. Ordering Information
supplier concerning the availability of a specific temper and form.
NOTE 4—H00 temper is commonly known in the building industry as
5.1 Include the following information when placing orders
cold-rolled temper.
for product under this specification, as applicable:
NOTE 5—H01 temper is commonly known in the building industry as
5.1.1 ASTM designation and year of issue (for example, cold-rolled, high yield temper.
B370–XX);
9. Physical Property Requirements
5.1.2 Temper (Section 8);
5.1.3 Dimensions: tolerances (Section 12);
9.1 Grain Size—Althoughnograinsizehasbeenestablished
5.1.4 How furnished: flat lengths or coils (4.1.2 – 4.1.4);
for temper O60, the product shall be recrystallized fully as
5.1.5 Quantity: total weight or number of pieces of each
determined by Test Methods E112.
form and size; and
5.1.6 When product is purchased for agencies of the U.S. 10. Mechanical Property Requirements
Government (Section 11).
10.1 Tensile and Yield Strength Requirements:
5.2 The following are options available under this specifi- 10.1.1 The product shall conform to the requirements speci-
cation and should be specified in the contract or purchase order fied in Table 3 for the specific temper when subjected to test in
when required: accordance with Test Methods E8/E8M.
5.2.1 Heat identification or traceability details,
10.1.2 Acceptance or rejection for mechanical properties
5.2.2 Certification, and shall be based upon the results of the tensile and yield strength
5.2.3 Mill test report.
tests.
10.2 Rockwell Hardness Requirement—The approximate
6. Materials and Manufacture
Rockwell values given in Table 3 are for general information
6.1 Materials—The material shall be any copper conform-
and assistance in testing and shall not be a basis for product
ing with the chemical composition requirements (Section 7).
rejection.
6.2 Manufacture:
NOTE 6—The Rockwell hardness test offers a quick and convenient
6.2.1 Sheet—The product shall be manufactured in flat
method of checking for general conformity to the specification require-
sheets. ments for temper and tensile strength.
B370−12 (2019)
TABLE 3 Mechanical Properties
B
Approximate Rockwell Hardness
A Yield Strength, at
Temper Designation Tensile Strength, ksi (MPa) (For Information Only)
0.5 % Extension Under
Scale
A
Load, min ksi (MPa)
Standard Former Min Max F Superficial 30 T
O60 soft 30 (205) 38 (260) . . . up to 65 up to 31
H00 cold-rolled 32 (220) 40 (275) 20 (135) 54–82 15–49
H01 cold-rolled, high yield 34 (235) 42 (290) 28 (190) 60–84 18–51
H02 half hard 37 (255) 46 (315) 30 (205) 77–89 43–57
H03 three-quarter hard 41 (285) 50 (345) 32 (220) 82–91 47–59
H04 hard 43 (295) 52 (360) 35 (240) 86–93 54–62
A
ksi = 1000 psi.
B
Rockwell hardness values apply as follows: The F scale applies to metal 0.020 in. (0.508 mm) and over in thickness; the superficial 30T scale applies to metal 0.012
in. (0.305 mm) to 0.020 in. (0.508 mm) in thickness.
TABLE 4 Width Tolerances for Slit Metal
Width Tolerances, Plus and
Width, in. (mm)
11. Purchases for U.S. Government Agencies
Minus, in. (mm)
Up to 24 (610), incl ⁄64 (0.40)
11.1 When identified in the contract o
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B370 − 12 B370 − 12 (Reapproved 2019)
Standard Specification for
Copper Sheet and Strip for Building Construction
This standard is issued under the fixed designation B370; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification establishes the requirements for rolled copper sheet and strip in flat lengths or coils in ounce-weight
thicknesses for roofing, flashing, gutters, downspouts, and general sheet metal work in building construction.
1.1.1 Products produced to this specification are not intended for electrical applications.
1.2 Units—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.
NOTE 1—Specification B101 is an associated specification for lead-coated copper sheets and strip for building construction.
1.3 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 establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
B101 Specification for Lead-Coated Copper Sheet and Strip for Building Construction
B248 Specification for General Requirements for Wrought Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled Bar
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B846 Terminology for Copper and Copper Alloys
E3 Guide for Preparation of Metallographic Specimens
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E112 Test Methods for Determining Average Grain Size
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E478 Test Methods for Chemical Analysis of Copper Alloys
3. General Requirements
3.1 The following sections of Specification B248 constitute a part of this specification:
3.1.1 Terminology,Terminology;
3.1.2 Materials and Manufacture,Manufacture;
3.1.3 Workmanship, Finish, and Appearance,Appearance;
3.1.4 Specimen Preparation,Preparation;
3.1.5 Test Methods,Methods;
3.1.6 Significance of Numerical Limits,Limits;
3.1.7 Inspection,Inspection;
3.1.8 Certification,Certification;
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.01 on Plate,
Sheet, and Strip.
Current edition approved Oct. 1, 2012Oct. 1, 2019. Published December 2012October 2019. Originally approved in 1961. Last previous edition approved in 20112012
ε1
as B370 – 11B370 .–12. DOI: 10.1520/B0370-12.10.1520/B0370–12R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B370 − 12 (2019)
3.1.9 Mill Test Report,Report;
3.1.10 Packaging and Package Marking,Marking; and
3.1.11 Supplementary Requirements.
3.2 In addition, when a section with a title identical to that referenced in 3.1, above, appears in this specification, it contains
additional requirements, which supplement those appearing in Specification B248.
4. Terminology
4.1 Definitions:
4.1.1 For definitions of terms related to copper and copper alloys, refer to Terminology B846.
4.1.2 coil, n—a length of the product wound into a series of connected turns.
4.1.2.1 Discussion—
The unqualified term “coil” as applied to “flat product” usually refers to a coil in which the product is spirally wound, with the
successive layers on top of one another (sometimes called a “roll”).
4.1.3 lengths, mill, n—straight lengths, including ends, that are be manufactured conveniently in the mills.
4.1.3.1 Discussion—
Full length pieces usually are 8 or 10 ft (2.4 or 3.0 m) and subject to established length tolerances.
4.1.4 length, stock, n—straight lengths that are mill cut and stored in advance of orders.
4.1.4.1 Discussion—
They usually are 8 or 10 ft (2.4 or 3.0 m) and subject to established length tolerances.
4.1.5 ounce-weight, n—the weight of copper sheet or strip expressed in ounces per square foot.
4.1.6 sheet, for building construction, n—a rolled flat product over 24 in. (610 mm) in width and of ounce-weight thickness from
8 to 48 oz.
4.1.7 strip, for building construction, n—a rolled flat product up to 24 in. (610 mm), inclusive, in width and of ounce-weight
thickness from 8 to 48 oz.
NOTE 2—In 4.1.6 and 4.1.7, the 8 to 48 oz refers to the names commonly used in the building industry for the sizes used. The respective sizes that
correspond to these names are listed in Table 1.
5. Ordering Information
5.1 Include the following information when placing orders for product under this specification, as applicable:
5.1.1 ASTM designation and year of issue (for example, B370–XX),–XX);
5.1.2 Temper (Section 8),);
5.1.3 Dimensions: tolerances (Section 12),);
5.1.4 How furnished: flat lengths or coils (4.1.2 – 4.1.4),);
5.1.5 Quantity: total weight or number of pieces of each form and size,size; and
5.1.6 When product is purchased for agencies of the U.S. Government (Section 11).
5.2 The following are options available under this specification and should be specified in the contract or purchase order when
required:
5.2.1 Heat identification or traceability details,
5.2.2 Certification, and
5.2.3 Mill test report.
6. Materials and Manufacture
6.1 Materials—The material shall be any copper conforming with the chemical composition requirements (Section 7).
6.2 Manufacture:
6.2.1 Sheet—The product shall be manufactured in flat sheets.
6.2.2 Strip—The product shall be manufactured in flat lengths or in coils (rolls) of one single continuous length not less than
25 ft (7.5 m) wound into a cylindrical spiral.
B370 − 12 (2019)
TABLE 1 Thickness Tolerances of Sheet and Strip
Tolerances, Plus
Theoretical
2 A
Ounce-Weight/ft and Minus
Thickness, in.
(mm)
in. (mm)
6 0.0081 (0.206) .001(.026)
8 0.0108 (0.274) .0011(.028)
10 0.0135 (0.343) .0011(.028)
12 0.0162 (0.411) .0012(.030)
16 0.0216 (0.549) .0012(.031)
20 0.0270 (0.686) .0012(.031)
24 0.0323 (0.820) .0015(.038)
32 0.0431 (1.09) .002(.05)
48 0.0646 (1.64) .0025(.06)
TABLE 1 Thickness Tolerances of Sheet and Strip
Tolerances, Plus
Theoretical
A
Ounce-Weight/ft Thickness, in. and Minus
(mm)
in. (mm)
6 0.0081 (0.206) 0.001 (0.026)
8 0.0108 (0.274) 0.0011 (0.028)
10 0.0135 (0.343) 0.0011 (0.028)
12 0.0162 (0.411) 0.0012 (0.030)
16 0.0216 (0.549) 0.0012 (0.031)
20 0.0270 (0.686) 0.0012 (0.031)
24 0.0323 (0.820) 0.0015 (0.038)
32 0.0431 (1.09) 0.002 (0.05)
48 0.0646 (1.64) 0.0025 (0.06)
A 3 3
Based on a density of 0.322 lb/in. (8.91 g/cm ).
7. Chemical Composition
7.1 The material shall be any copper with a minimum copper content, including silver, of 99.5 %.
7.1.1 Limits shall be established and analysis required for unnamed elements by agreement between the manufacturer and the
purchaser.
8. Temper
8.1 The standard tempers for products described in this specification are given in Table 3.
8.2 Cold Rolled tempers as defined in Classification B601: H00 (cold-rolled), H01 (cold-rolled, high yield), H02 (half hard),
H03 (three-quarter hard), and H04 (hard).
8.3 Annealed temper as defined in Classification B601: O60 (soft)
NOTE 3—The purchaser should confer with the manufacturer or supplier concerning the availability of a specific temper and form.
NOTE 4—H00 temper is commonly known in the building industry as cold-rolled temper.
NOTE 5—H01 temper is commonly known in the building industry as cold-rolled, high yield temper.
9. Physical Property Requirements
9.1 Grain Size—Although no grain size has been established for temper O60, the product shall be recrystallized fully as
determined by Test MethodMethods E112.
10. Mechanical Property Requirements
10.1 Tensile and Yield Strength Requirements:
10.1.1 The product shall conform to the requirements specified in Table 3 for the specific temper when subjected to test in
accordance with Test Methods E8E8/E8M.
10.1.2 Acceptance or rejection for mechanical properties shall be based upon the results of the tensile and yield strength tests.
10.2 Rockwell Hardness Requirement —Requirement—The approximate Rockwell values given in Table 3 are for general
information and assistance in testing and shall not be a basis for product rejection.
NOTE 6—The Rockwell hardness test offers a quick and convenient method of checking for general conformity to the specification requirements for
temper and tensile strength.
11. Purchases for U.S. Government Agencies
11.1 When identified in the contract or purchase order, product purchased for agencies of the U.S. Government shall conform
to the special government requirements stipulated in the Supplemental Requirements.
B370 − 12 (2019)
TABLE 2 Thickness Tolerances of Sheet and Strip to be Coated
for Flashing
Ounce- Weight/ft Theoretical Tolerances,
A
Thickness, Plus and Minus
in. (mm)
in. (mm)
2 .0027 (.068) .0004 (.010)
3 .004 (.103) .0005 (.013)
4 .0054 (.138) .0006 (.0152)
5 .0067 (.171) .0006 (.0152)
TABLE 2 Thickness Tolerances of Sheet and Strip to be Coated
for Flashing
Tolerances,
Theoretical
A
Ounce-Weight/ft Plus and Minus
Thickness,
in. (mm) in. (mm)
2 0.0027 (0.068) 0.0004
(0.010)
3 0.004 (0.103) 0.0005 (0.013)
4 0.0054 (0.138) 0.0006 (0.0152)
5 0.0067 (0.171) 0.0006 (0.0152)
A 3 3
Based on a density of 0.322 lb/in. (8.91 g/cm ).
12. Dimensions, Mass, and Permissible Variations
12.1 The product shall conform to the following requirements:
12.1.1 Thickness:
12.1.1.1 Tolerances of Sheet and Strip—The standard method for specifying thickness shall be by ounce-weight. The theoretical
thickness for standard ounce-weights and the minimum and maximum thickness, measured at any point, shall be as specified in
Table 1.
12.1.2 Thickness for Coated Copper for Flashing:
12.1.2.1 Tolerances for Sheet and Strip to be Subsequently Bonded with Rubber, Fibreglass or Other Material for
Flashing—The standard method for specifying thickness shall be by ounce-weight. The theoretical thickness for standard
ounce-weights and the minimum and maximum thickness, measured at any point, shall be as specified in Table 2.
12.1.3 Weight:
12.1.3.1 Weight tolerances shall be as specified in Table 1.
12.1.4 Width:
12.1.4.1 Tolerances for Slit Metal—Table 4.
12.1.4.2 Tolerance for Square-Sheared Metal—Table 5.
12.1.5 Length.
12.1.5.1 Tolerances for Specific and Stock—Table 6.
12.1.5.2 Tolerances for Square-Sheared Metal—Table 7.
12.1.6 Straightness.
12.1.6.1 Tolerances or Slit Metal—Table 8.
12.1.6.2 Tolerances for Square-Sheared Metal—Table 9.
13. Sampling
13.1 Sampling—The lot size, portion size, and selection of sample pieces shall be as follows.
13.1.1 Lot Size—An inspection lot shall be 10 000 lb (4540 kg) or less of product of the same mill form, alloy, temper, and
nominal dimensions, subject to inspection at one time, or shall be the product of one cast bar from a single melt charge whose
weight shall not exceed 25 000 lb (11 340 kg) that has been processed continuously and subject to inspection at one time.
13.1.2 Portion Size—A portion shall be four or more pieces selected as to be representative of the lot. When the lot consist of
less than four pieces, representative samples shall be taken from each piece.
13.2 Chemical Analysis:
13.2.1 The sample for chemical analysis shall be taken from the pieces selected and combined into one composite sample in
accordance with Practice E255 for product in its final form. The minimum weight of the composite sample shall be 150 g.
13.2.2 Instead of sampling in accordance with Practice E255, the manufacturer shall have the option of taking samples at the
time the castings are poured or by taking samples from the semifinished product.
13.2.2.1 When composition of the material has been determined during the course of manufacture, sampling of the finished
product by the manufacturer is not required.
13.2.3 The number of samples to be taken for determination of chemical composition shall be as follows.
13.2.3.1 When sampled at the time the castings are poured, at least one sample shall be taken for each group of castings poured
from the same source of molten metal.
B370 − 12 (2019)
TABLE 3 Mechanical Properties
B
Approximate Rockwell Hardness
A Yield Strength, at
Temper Designation Tensile Strength, ksi (MPa) (For Information Only)
0.5 % Extension Under
Scale
A
Load, min ksi (MPa)
Standard Former Min Max F Superficial 30 T
B
Approximate Rockwell Hardness (For
Yield Strength, at
A
Temper Designation Tensile Strength, ksi (MPa) Information Only)
0.5 % Extension Under
Scale
A
Load, min ksi (MPa)
Standard Former Min Max F Superficial 30 T
O60 soft 30 (205) 38 (260) . . . up to 65 up to 31
H00 cold-rolled 32 (220) 40 (275) 20 (135) 54–82 15–49
H01 cold-rolled, high yield 34 (235) 42 (290) 28 (190) 60–84 18–51
H02 half hard 37 (255) 46 (315) 30 (205) 77–89 43–57
H03 three-quarter hard 41 (285) 50 (345) 32 (220) 82–91 47–59
H04 hard 43 (295) 52 (360) 35 (240) 86–93 54–62
A
ksi = 1000 psi.
B
Rockwell hardness values apply as follows: The F scale applies to metal 0.020 in. (0.508 mm) and over in thickness; the superficial 30T scale applies to metal 0.012
in. (0.305 mm) to 0.020 in. (0.508 mm) in thickness.
TABLE 4 Width Tolerances for Slit Metal
Width Tolerances, Plus an
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