ASTM A193 B7 Combination Studs Step Down Studs

ASTM A193 B7 Combination Studs Step Down Studs

Short Description:

ASTM A193/A193M B7 Combination Studs Step Down Studs Alloy steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.   Standard: According to drawing Inch Size: 1/4”-4” with various lengths Metric Size: M6-M100 with various lengths Other Available Grade: ASTM A193/A193M B7, B7M, B16 B8 Class 1 & 2, B8M Class 1 & 2, ASTM A320/A320M L7, L7M, L43, B8 Class 1 & 2, B8M Class 1 & 2, and so ...


  • FOB Price: US $0.5 - 9,999 / Piece
  • Min.Order Quantity: 100 Piece/Pieces
  • Supply Ability: 10000 Piece/Pieces per Month
  • Port: Ningbo
  • Payment Terms: L/C,D/A,D/P,T/T
  • Product Detail

    Product Tags

    Product Description

    ASTM A193/A193M B7 Combination Studs Step Down Studs

    Alloy steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.

     

    Standard: According to drawing

    Inch Size: 1/4”-4” with various lengths

    Metric Size: M6-M100 with various lengths

    Other Available Grade:

    ASTM A193/A193M B7, B7M, B16 B8 Class 1 & 2, B8M Class 1 & 2,

    ASTM A320/A320M L7, L7M, L43, B8 Class 1 & 2, B8M Class 1 & 2, and so on.

    Finish: Plain, Black Oxide, Zinc Plated, Zinc Nickel Plated, Cadmium Plated, PTFE etc.

    Packing: Bulk about 25 kgs each carton, 36 cartons each pallet

    Advantage: High Quality and Strict Quality Control, Competitive Price,Timely Delivery; Technical Support, Supply Test Reports

    Please feel free to contact us for more details.

    Product Standards

    ASTM A193

    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 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 Nuts Washers
    B7 A194 Grade 2H 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

    Product Certificates

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    About us

    Testing Lab

    1. Strength Testing Facility
    2. Impact Testing Facility
    3. Hardness Testing Facility
    5. Metallographic Analysis Facility

    Workshop

    1 Annealing Furnace
    2 Cold Forging Line
    3 Hot Forging Line
    4 Heat Treatment line
    5 Heat Treatment Line
    6 Thread Rolling  Line
    7 Thread Rolling  Line
    8 Thread Rolling  Line
    9 CNC Lathe Workshop
    10 CNC Machining Center

    Warehouse

    3 Carton and Pallet
    5 Threaded Rod Packing
    2 Metal Keg and Pallet
    6 Threaded Rod Packing
    4 Threaded Rod Packing
    1 Stock Shelf

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