ASTM A1014 Bolting

ASTM A1014/A1014M (Edition 2016) specification covers a precipitation hardening bolting material (UNS N07718) aka Inconel 718 for high temperature service.

ASTM A1014 (UNS N07718) Inconel 718 Bolts, Screws, Studs, Threaded Rod Supplier and Manufacturer

Inconel 718 Bolts, Inconel 718 Screws and Inconel 718 Threaded Rod Shall be uniform in quality and condition, smooth, commercially straight or flat, and free of injurious imperfections. These Fasteners are marked with “718” and manufacturer’s identification symbol “TorqBolt” or “ TB”. This Bolting specification is equivalent to SAE AS 7467 Bolts And Screws, Nickel Alloy, UNS N07718 Tensile Strength 185 KSI Stress Rupture Rated Procurement Specification.

Corresponding accessories used with ASTM A1014 Bolting also known as Fastener Materials Intended for Use at Any Temperature from Cryogenic to the Creep Range are as follows:

ASTM A1014 Chemical Composition

ElementUNS N07718 (Formerly Grade 718)
Carbon, max.0.08
Manganese, max.0.35
Silicon, max.0.35
Phosphorus, max.0.015
Sulfur, max.0.015
Chromium17.0-21.0
Cobalt, max.A1.0
Molybdenum2.80-3.30
Columbium + Tantalum4.75-5.50
Titanium0.65-1.15
Aluminum0.20-0.80
Boron, max.0.006
IronBRemainder
Copper, max.0.30
NickelC50.0-55.0

A If determined.

B Determined arithmetically by difference. C Nickel + Cobalt.

Additional Notes

  • Remelt Ingots—The chemical analyses of each remelted ingot shall conform to the requirements for chemical composition prescribed in Above Table.
  • Product Analysis—If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis variations prescribed in Specification B 880.

ASTM A1014 Mechanical Properties

Tensile and Hardness
Tensile strength, min, ksi (Mpa) 185 (1275)
Yield Strength, min, ksi, (Mpa) 0.2 % offset 150 (1035)
Elongation in 2 in., min % 12
Reduction of area, min, % 15
Hardness, Brinell 331-444
Stress Rupture Requirements
Temperature, °F (°C) 1200 (650)
Stress, ksi (Mpa) 100 (690)
Hours, min 23
Elongation in 2 in., or 50 mm (or 4D), min % 5
Elevated Tensile Requirements
Temperature, °F (°C) 1200 (650)
Tensile strength, min, ksi (Mpa) 145 (1000)
Yield Strength, min, ksi, (Mpa) 0.2 % offset 125 (860)
Elongation in 2 in., min % 12
Reduction of area, min, % 15

where:

Ts = tensile strength,

UTS = tensile strength specified in Table 2, and As = stress area, square inches, as shown in ANSI B1.1 or calculated as follows:

As = 0.785 (D – (0.974/n) )2 (2)

where:

D = nominal thread size, and n = the number of threads per inch.

Additional Notes

  • Tensile and Hardness—All testing shall be performed after aging. The test specimens shall meet the requirements.
  • Stress Rupture—Stress rupture testing shall be conducted in accordance with in Above Table using a combination test bar in accordance with Test Methods E 292. Rupture must occur in the smooth section of each test specimen.
  • Headed fasteners with body length three times the diameter or longer shall be subjected to full size tensile test in accordance with Annex A3 of Test Methods and Definitions A 370 and shall conform to the tensile strength shown in Table 2. The minimum full size breaking strength (lbf) for individual sizes shall be as follows:
    Ts = UTS X As (1)

Download PDF: ASTM A1014 at ASTM.org

ASTM A1014 Heat Treatment

  • Solution Treatment—Material shall be solution heat treated at a temperature within the range of 1725 to 1850°F (941 to 1010°C), held at the selected temperature for a time commensurate with cross-sectional thickness, and cooled at a rate equivalent to an air cool or faster.
  • Temperature Variation—Solution treating temperatures shall be controlled in the range of ± 25°F (± 14°C).

ASTM A1014 Metallography

  • Microstructure—The microstructure shall be free of freckles, white spots, and Laves phases. Threads may show evidence of cold working as a result of rolling. The average grain size shall be determined in accordance with Test Methods E 112 and found to be ASTM No 5 or finer. Up to 20 % of the structure may have a grain size as large as a No. 3 due to the presence of noncrystallized grains.
  • Macrostructure—Fasteners produced from forgings shall exhibit continuous flow lines in the threads and in any shank to head or fillet and/or bearing surface areas.

Related ASTM Specification

B 637 Specification for Precipitation-Hardening Nickel Al- loy Bars, Forgings, and Forging Stock for High- Temperature Service

B 880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys, and Cobalt Alloys

E 112 Test Methods for Determining the Average Grain Size

E 292 Test Methods for Conducting Time-For-Rupture Notch Tension Tests of Materials

A 370 Test Methods and Definitions for Mechanical Testing of Steel Products

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

ASTM A1082 / A1082M – 16 : Standard Specification for High Strength Precipitation Hardening and Duplex Stainless Steel Bolting for Special Purpose Applications

ASTM A1014 / A1014M – 16 : Standard Specification for Precipitation-Hardening Bolting (UNS N07718) for High Temperature Service

ASTM F2281 : Standard Specification for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications Designation

ASTM A453 / A453M – 16 : Standard Specification for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels

ASTM A638 / A638M : Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

ASTM B637 – 15 : Standard Specification for Precipitation-Hardening and Cold Worked Nickel Alloy Bars, Forgings, and Forging Stock for Moderate or High Temperature Service

ASTM B564 – 15 : Standard Specification for Nickel Alloy Forgings

ASTM A962 / A962M – 16a : Standard Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range

ASTM F467 – 15 : Standard Specification for Nonferrous Nuts for General Use

ASTM F468 – 15 : Standard Specification for Nonferrous Bolts, Hex Cap Screws, Socket Head Cap Screws, and Studs for General Use

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