ASTM C774-88(2006)

Standard Test Method for Yield Strength of Enameling Steels After Straining and Firing

SIGNIFICANCE AND USE
In the manufacture of porcelain enameled ware, sheet steel is subjected to forming operations and subsequently to firing of the enamel at temperatures, typically, of 1400 to 1550°F (760 to 844°C). Some steels used for porcelain enameling are subject to grain growth in critically strained areas resulting in loss of strength.
This may lead to easy deformation of the steel and damage to the porcelain enamel coating.
This test method may be correlated with transit or use tests to evaluate the suitability of steel for porcelain enameled ware.
SCOPE
1.1 This test method covers determination of the yield strength of steel specimens after simulated forming and enamel firing operations.
1.2 The values stated in inch-pound units are to be regarded as the standard. SI units are provided for information only.
1.3  This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2006
• ICS: 25.220.50 - Enamels
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.12 - Materials for Porcelain Enamel and Ceramic-Metal Systems

Relations

• Replaces: ASTM C774-88(2000) - Standard Test Method for Yield Strength of Enameling Steels After Straining and Firing
• Effective Date: 01-Apr-2006
• Replaced By: ASTM C774-88(2011)e1 - Standard Test Method for Yield Strength of Enameling Steels After Straining and Firing
• Effective Date: 01-Apr-2011
• Referred By: ASTM C286-22 - Standard Terminology Relating to Porcelain Enamel and Ceramic-Metal Systems
• Effective Date: 01-Apr-2006

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:C774–88(Reapproved 2006)
Standard Test Method for
Yield Strength of Enameling Steels After Straining and
Firing
This standard is issued under the fixed designation C774; 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 5. Significance and Use
1.1 This test method covers determination of the yield 5.1 In the manufacture of porcelain enameled ware, sheet
strength of steel specimens after simulated forming and enamel steel is subjected to forming operations and subsequently to
firing operations. firing of the enamel at temperatures, typically, of 1400 to
1.2 The values stated in inch-pound units are to be regarded 1550°F (760 to 844°C). Some steels used for porcelain
as the standard. The values given in parentheses are for enameling are subject to grain growth in critically strained
information only. areas resulting in loss of strength.
1.3 This standard does not purport to address all of the 5.2 This may lead to easy deformation of the steel and
safety concerns, if any, associated with its use. It is the damage to the porcelain enamel coating.
responsibility of the user of this standard to establish appro- 5.3 This test method may be correlated with transit or use
priate safety and health practices and determine the applica- tests to evaluate the suitability of steel for porcelain enameled
bility of regulatory limitations prior to use. ware.
2. Referenced Documents 6. Apparatus
2.1 ASTM Standards: 6.1 Shear for cutting blanks.
A370 Test Methods and Definitions for Mechanical Testing 6.2 Equipment for cutting or machining tension specimens.
of Steel Products 6.3 Gage, 2-in. (50.8-mm), for marking tension specimens.
E8 Test Methods for Tension Testing of Metallic Materials 6.4 Tension-Testing Equipment, as described in Test Meth-
ods and Definitions A370.
3. Definition
6.5 Specimen-Supporting Rack, slotted to support speci-
3.1 quarter lines—imaginary lines parallel to the direction
mens on edge spaced 1 in. (25.4 mm) apart.
of rolling, positioned at a distance from the sheet mill edge 6.6 Furnace, capable of heating the test specimens and their
equal to one quarter of the sheet width.
supporting rack to the firing temperature in 2 min.
4. Summary of Test Method 7. Reagents and Materials
4.1 Representative sheet-steel specimens are selected,
7.1 Sheet Steel, sufficient in size to provide the test speci-
strained in tension to simulate forming, heat treated to simulate men, described in Section 8.
enamel firing, and tension tested for determination of yield
7.2 Solvent, such as acetone or isopropyl alcohol.
strength. 7.3 Hydrochloric Acid (1+1)—Dilute 1 volume of concen-
trated hydrochloric acid (HCl, sp gr 1.19) with 1 volume of
water.
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 on
8. Sampling
Materials for Porcelain Enamel and Ceramic-Metal Systems.
8.1 Obtain ten test samples, each approximately 1 by 9 in.
Current edition approved April 1, 2006. Published April 2006. Originally
approved in 1974. Last previous edition approved in 2000 as C774 – 88 (2000). (25 by 229 mm), from within the quarter lines of the sheet
DOI: 10.1520/C0774-88R06.
sample, the long dimension being in the direction of rolling.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Cu
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