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A193 B7牙条

更新时间:2014-03-25    有效期:6个月     加入收藏

A193 B7牙条

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  • Detailed Description :    
     Standard: ASTM A193 B7—ASTM A194 2H
                       ASTM A193 B7M—ASTM A194 2HM
                       ASTM A320 L7—ASTM A194 GR.7
                       ASTM A320 L7M—ASTM A194 GR7M
    MATERIAL: 1040,1045,4140,4142
    Surface protection: Plain, Hot dip galvanized, Galvanization, Dacroment, Xylan .
    Packing: Standard packing or According to customers' requirements
    According to customers' Drawings and/or samples


     

     

    Scope
    Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications.  The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
    Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
    Grades


    B7
    Alloy steel, AISI 4140/4142 quenched and tempered
    B8
    Class 1 Stainless steel, AISI 304, carbide solution treated.
    B8M
    Class 1 Stainless steel, AISI 316, carbide solution treated.
    B8
    Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
    B8M
    Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened


    Mechanical Properties


    Grade
    Size
    Tensile ksi, min
    Yield, ksi, min
    Elong, %, min
    RA % min
    B7
    Up to 2-1/2
    125
    105
    16
    50
    2-5/8 - 4
    115
    95
    16
    50
    4-1/8 - 7
    100
    75
    18
    50
    B8 Class 1
    All
    75
    30
    30
    50
    B8M Class 1
    All
    75
    30
    30
    50
    B8 Class 2
    Up to 3/4
    125
    100
    12
    35
    7/8 - 1
    115
    80
    15
    35
    1-1/8 - 1-1/4
    105
    65
    20
    35
    1-3/8 - 1-1/2
    100
    50
    28
    45
    B8M Class 2
    Up to 3/4
    110
    95
    15
    45
    7/8 - 1
    100
    80
    20
    45
    1-1/8 - 1-1/4
    95
    65
    25
    45
    1-3/8 - 1-1/2
    90
    50
    30
    45


    Recommended Nuts and Washers


    Bolt Grade
    Washers
    B7
    F436
    B8 Class 1
    A194 Grade 8
    SS304
    B8M Class 1
    A194 Grade 8M
    SS316
    B8 Class 2
    A194 Grade 8
    SS304
    B8M Class 2
    A194 Grade 8M
    SS316



    Strain hardened nuts available as a supplementary requirement
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