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    Astm A194

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    poerwnti
    The document discusses ASTM A194, a specification covering carbon, alloy, and stainless steel nuts intended for high-pressure and high-temperature service. It lists various grades of nuts including carbon steel, quenched and tempered carbon steel, alloy steel, and stainless steel. It provides the chemical and mechanical properties for each grade, intended applications, hardness levels, and other testing requirements.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Astm A194

    Uploaded by

    poerwnti
    85 views3 pages
    The document discusses ASTM A194, a specification covering carbon, alloy, and stainless steel nuts intended for high-pressure and high-temperature service. It lists various grades of nuts including carbon steel, quenched and tempered carbon steel, alloy steel, and stainless steel. It provides the chemical and mechanical properties for each grade, intended applications, hardness levels, and other testing requirements.

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    ASTM A194

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    ASTM A194

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    The document discusses ASTM A194, a specification covering carbon, alloy, and stainless steel nuts intended for high-pressure and high-temperature service. It lists various grades of nuts including carbon steel, quenched and tempered carbon steel, alloy steel, and stainless steel. It provides the chemical and mechanical properties for each grade, intended applications, hardness levels, and other testing requirements.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    85 views3 pages

    Astm A194

    Uploaded by

    poerwnti
    The document discusses ASTM A194, a specification covering carbon, alloy, and stainless steel nuts intended for high-pressure and high-temperature service. It lists various grades of nuts including carbon steel, quenched and tempered carbon steel, alloy steel, and stainless steel. It provides the chemical and mechanical properties for each grade, intended applications, hardness levels, and other testing requirements.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    The document discusses ASTM A194 specification which covers carbon, alloy and stainless steel nuts intended for high-pressure and high-temperature applications. It specifies various grades of nuts along with their mechanical and chemical properties.

    The main grades specified are 2, 2H, 2HM, 4, 7, 7M, 8 and 8M with variations in material composition and heat treatment for each grade.

    Properties like proof load stress, hardness and tempering temperature are specified for each grade to ensure they can withstand high pressures and temperatures.

    (800) 547-6758

    sales@portlandbolt.com

    ASTM A194
    The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pres-
    sure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy
    Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Se-
    ries Class 2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series
    Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace and are often substi-
    tuted for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and fin-
    ishes.

    A194 Grades
    2 Carbon steel heavy hex nuts

    2H Quenched & tempered carbon steel heavy hex nuts

    2HM Quenched & tempered carbon steel heavy hex nuts, 100% hardness tested

    4 Quenched & tempered carbon-molybdenum heavy hex nuts (withdrawn in 2017)

    7 Quenched & tempered alloy steel heavy hex nuts

    7M Quenched & tempered alloy steel heavy hex nuts, 100% hardness tested

    7L Quenched & tempered alloy steel heavy hex nuts, Charpy impact tested

    8 Stainless AISI 304 heavy hex nuts

    8M Stainless AISI 316 heavy hex nuts

    A194 Mechanical Properties


    Proof Hardness
    Grade Identifi-
    Nominal Tempering Load Rockwell See
    cation Mark- Specification Material
    Size, In. Temp. °F Stress, Note
    ing5 Min Max
    ksi

    ASTM A194 Medium Car-


    1/4 - 4 0 150 159 352 1,2,3
    Grade 2 bon Steel
    Medium Car-
    ASTM A194 bon Steel,
    1/4 - 4 850 175 C24 C38 1,2
    Grade 2H Quenched and
    Tempered

    Medium Car-
    ASTM A194 bon Steel,
    1/4 - 4 1150 150 159 237 1,2,3
    Grade 2HM Quenched and
    Tempered

    Medium Car-
    bon Alloy
    ASTM A194
    Steel, 1/4 - 4 1100 175 C24 C38 1,2
    Grade 4
    Quenched and
    Tempered

    Medium Car-
    bon Alloy
    ASTM A194
    Steel, 1/4 - 4 1100 175 C24 C38 1,2
    Grade 7
    Quenched and
    Tempered

    Medium Car-
    bon Alloy
    ASTM A194
    Steel, 1/4 - 4 1150 150 159 237 1,2,3
    Grade 7M
    Quenched and
    Tempered

    ASTM A194 Stainless AISI


    1/4 - 4 - 80 126 300 4
    Grade 8 304

    ASTM A194 Stainless AISI


    1/4 - 4 - 80 126 300 4
    Grade 8M 316
    NOTES:

    1. The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When
    nuts are machined from bar stock, the nut must additionally be marked with the letter 'B'. The let-
    ters H and M indicate heat treated nuts.
    2. Properties shown are those of coarse and 8-pitch thread heavy hex nuts.
    3. Hardness numbers are Brinell Hardness.
    4. Nuts that are carbide-solution treated require additional letter A - 8A or 8MA.
    5. All nuts shall bear the manufacturer’s identification mark. Nuts shall be legibly marked on one face
    to indicate the grade and process of the manufacturer. Marking of wrench flats or bearing surfaces
    is not permitted unless agreed upon between manufacturer and purchaser.
    6. Other less common grades exist, but are not listed here.

    Inch Fastener Standards. 7th ed. Cleveland: Industrial Fasteners Institute, 2003. N-80 - N-81.

    A194 Chemical Properties


    Element 2, 2H, and 2HM 4 7 and 7M (AISI 4140) 8 (AISI 304) 8M (AISI 316)

    Carbon 0.40% min 0.40 - 0.50% 0.37 - 0.49% 0.08% max 0.08% max

    Manganese 1.00% max 0.70 - 0.90% 0.65 - 1.10% 2.00% max 2.00% max

    Phosphorus, max 0.040% 0.035% 0.035% 0.045% 0.045%

    Sulfur, max 0.050% 0.040% 0.040% 0.030% 0.030%

    Silicon 0.40% max 0.15 - 0.35% 0.15 - 0.35% 1.00% max 1.00% max

    Chromium 0.75 - 1.20% 18.0 - 20.0% 16.0 - 18.0%

    Nickel 8.0 - 11.0% 10.0 - 14.0%

    Molybdenum 0.20 - 0.30% 0.15 - 0.25% 2.00 - 3.00%

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