ASTM F879 Stainless Steel Socket Button and Flat Countersunk Head Cap Screws manufacturers in india , ASTM F879 Stainless Steel Socket Button and Flat Countersunk Head Cap Screws Suppliers in india

ASTM F879 Stainless Steel Socket Button and Flat Countersunk Head Cap Screws

ASTM F879 Stainless Steel Socket Button and Flat Countersunk Head Cap Screws

1. Scope

1.1 This specification covers the chemical and mechanical requirements for stainless steel inch hexagon socket button (SBHCS) and flat countersunk (SFHCS) head cap screws with nominal thread 0.060 through 0.625 in. intended for use in applications requiring general corrosion resistance.

1.2 Two groups of austenitic stainless steel alloys and three conditions are covered.

TABLE 1 Mechanical Property Requirements

Alloy Group

Alloy

Condition

 

Full Size Product TestsA

Machined Specimen Tests

Core HardnessB

Tensile

Strength ksi

ExtensionC

min

Tensile

Strength ksi

Yield

Strength ksi

Elongation

% min

Vickers

Rockwell

All

   AF

   85 max

0.6D

   85 max

55 max

40

210 max

95 HRB max

All

   CW

   80 min

0.4D

   80 min

40 min

25

150 min

50 HRA min

All

   CW1

  102 min

0.4D

   87 min

65 min

20

220 min

59 HRA min

A Actual full-size testing of condition CW and CW1 may result in decreased tensile strength because of the head configuration . For fasteners with nominal thread diameters larger than 0.625 in., the mechanical properties shall be agreed upon between the user and manufacturer.

TABLE 2 Chemical Requirements

Alloy Group

UNS Designation

 

Alloy

 

Composition, % maximum except as shown

Carbon

Manganese

Phosphorus

Sulfur

Silicon

Chromium

Nickel

Copper

Molybdeneunm

Austenitic Alloys

1

S30400

304

0.08

2.00

0.045

0.030

1.00

18.0 to 20.0

 8.0 to 10.5

1.00

. . .

1

S30403

304L

0.030

2.00

0.045

0.030

1.00

18.0 to 20.0

 8.0 to 12.0

1.00

. . .

1

S30500

305

0.12

2.00

0.045

0.030

1.00

17.0 to 19.0

10.5 to 13.0

1.00

. . .

1

S38400

384

0.08

2.00

0.045

0.030

1.00

15.0 to 17.0

17.0 to 19.0

. . .

. . .

1

S30430

18–9LW

0.10

2.00

0.045

0.030

1.00

17.0 to 19.0

 8.0 to 10.0

3.0 to 4.0

. . .

1

S30433

302HQ

0.03

2.00

0.045

0.030

1.00

17.0 to 19.0

 8.0 to 10.0

3.0 to 4.0

. . .

2

S31600

316

0.08

2.00

0.045

0.030

1.00

16.0 to 18.0

10.0 to 14.0

. . .

2.00 to 3.0

2

S31603

316L

0.03

2.00

0.045

0.030

1.00

16.0 to 18.0

10.0 to 14.0

. . .

2.00 to 3.0

 

1.3 Units—The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 The following precautionary caveat pertains only to the test method portion, Section 12, of this specification: 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.

Related ASTM Specification

  • A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
  • A342/A342M Test Methods for Permeability of Weakly Magnetic Materials
  • A380/A380M Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
  • A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods
  • A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
  • A967/A967M Specification for Chemical Passivation Treatments for Stainless Steel Parts
  • D3951 Practice for Commercial Packaging
  • E18 Test Methods for Rockwell Hardness of Metallic Materials
  • E92 Test Method for Vickers Hardness of Metallic Materials
  • E384 Test Method for Knoop and Vickers Hardness of Materials
  • F593 Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
  • F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
  • F788 Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
  • F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

JIS Standard

JIS G 4309 Stainless Steel Wires

ASME Standard

B18.3 Socket Cap, Shoulder and Set Screws (Inch Series) Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters

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