ASTM C774-88(2011)e1

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. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2011
• 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(2006) - 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-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
´1
Designation: C774 − 88 (Reapproved 2011)
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.
´ NOTE—Test Method was corrected editorially in 2011
INTRODUCTION
The strength after strain and fire of a steel is a significant factor in the strength of the final enameled
ware. This test provides a method to quantify the yield strength of enamel steels after straining and
firing by straining duplicate test plates to five different strain levels, exposing to a simulated enamel
fire, and measuring the yield stress with a standardized tensile pull test.
1. Scope 4. Summary of Test Method
1.1 This test method covers determination of the yield 4.1 Representative sheet-steel specimens are selected,
strength of steel specimens after simulated forming and enamel strained in tension to simulate forming, heat treated to simulate
firing operations. enamel firing, and tension tested for determination of yield
strength.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
5. Significance and Use
information only.
5.1 In the manufacture of porcelain enameled ware, sheet
1.3 This standard does not purport to address all of the
steel is subjected to forming operations and subsequently to
safety concerns, if any, associated with its use. It is the
firing of the enamel at temperatures, typically, of 1400 to
responsibility of the user of this standard to establish appro-
1550°F (760 to 844°C). Some steels used for porcelain
priate safety and health practices and determine the applica-
enameling are subject to grain growth in critically strained
bility of regulatory limitations prior to use.
areas resulting in loss of strength.
2. Referenced Documents
5.2 This may lead to easy deformation of the steel and
damage to the porcelain enamel coating.
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing
5.3 This test method may be correlated with transit or use
of Steel Products
tests to evaluate the suitability of steel for porcelain enameled
E8 Test Methods for Tension Testing of Metallic Materials
ware.
3. Definition
6. Apparatus
3.1 quarter lines—imaginary lines parallel to the direction
6.1 Shear for cutting blanks.
of rolling, positioned at a distance from the sheet mill edge
6.2 Equipment for cutting or machining tension specimens.
equal to one quarter of the sheet width.
6.3 Gage, 2-in. (50.8-mm), for marking tension specimens.
6.4 Tension-Testing Equipment, as described in Test Meth-
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
ods and Definitions A370.
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 on
Materials for Porcelain Enamel and Ceramic-Metal Systems.
6.5 Specimen-Supporting Rack, slotted to support speci-
Current edition approved April 1, 2011. Published April 2011. Originally
mens on edge spaced 1 in. (25.4 mm) apart.
approved in 1974. Last previous edition approved in 2006 as C774 – 88 (2006).
DOI: 10.1520/C0774-88R11E01.
6.6 Furnace, capable of heating the test specimens and their
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
supporting rack to the firing temperature in 2 min.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 7. Reagents and Materials
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