This standard is issued under the fixed designation A/AM; the number 1 This specification is under the jurisdiction of ASTM Committee A01 on Steel. ASTM A Scope - This specification is heavily utilized in petroleum and chemical construction applications and covers alloy steel and stainless steel bolting. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. ASTM A covers a number of other standard specifications not covered in this description including B5, B6, and B B7 B8 B8M B8 B8M Alloy steel, AISI
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A / AM Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Standard + Redline PDF Bundle ASTM License Agreement. ASTM A Grade B7 is a material specification for low alloy chromium- molybdenum steel, used for manufacturing of bolts, studs, stud bolts and other fasteners. Designation: A/AM – 10a Standard Speci?cation for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure.
Below is an overview of some of the specifics these fasteners are required to meet. This list is not inclusive, but represents some of the differences between these two designations. First thread is defined as the intersection of the major diameter of the thread with the base of the point. Please see the drawing above-this is confusing to most users!!
Length tolerances, all stud bolt sizes, shall be as tabulated below: Length, in. Length Tolerance, in. When points are flat and chamfered, the diameter of the flat shall not exceed the minor diameter of the thread, and shall be not less than one or more than two complete threads as measured from the extreme end parallel to the axis.
It is recommended that stud bolts be designated in the following sequence: product name, nominal size, threads per inch, length, material, and protective finish, if required.
S units. The Standard is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.
For most the accurate references in critical situations torque values should be replaced with field measured tension values. Accurate stud tension is difficult to attain using torque, because friction has a significant effect on the torque—tension relationship.
Full Description 1. Other Browser: Other 0. Direct Navigation IP: Class 1D applies only to bar and wire and? This designation does not apply to starting material such as bar. Fasteners shall be heated from ambient temperature and held a sufficient time at a temperature at which the chromium carbide will go into solution and then shall be cooled at a rate sufficient to prevent the precipitation of the carbide.
Following this treatment the material shall then be strain hardened to achieve the required properties. NOTE 5—Heat treatment following operations performed on a limited portion of the product, such as heading, may result in non-uniform grain size and mechanical properties through the section affected.
Chemical Composition 8.
Furthermore, elements present in concentrations greater than 0. Heat Analysis 9. Should the downloadr deem it necessary to have the transition zone of two heats sequentially cast discarded, the downloadr shall invoke Supplementary Requirement S3 of Speci? Mechanical Properties Alternatively, stainless strain hardened fasteners Class 2, 2B, and 2C shall be tested full size after strain hardening to determine tensile strength and yield strength and shall conform to the requirements prescribed in Tables 2 and 3.
Should the results of full size tests con? Hardness testing shall be performed in accordance with either Speci? Conformance to this hardness shall be ensured by testing the hardness of each stud or bolt by Brinell or Rockwell B methods in accordance with Following electromagnetic testing for hardness a random sample of a minimum of pieces of each heat of steel in each lot as de?
All samples must meet hardness requirements to permit acceptance of the lot. If any one sample is outside of the speci? Hardness tests shall be performed on the end of the bolt or stud. When this is impractical, the hardness test shall be performed elsewhere. Workmanship, Finish, and Appearance Points shall be? Length of point on studs and stud bolts shall be not less than one nor more than two complete threads as measured from the extreme end parallel to the axis.
Length of studs and stud bolts shall be measured from? Unless otherwise speci? The body diameter and head? Retests Test Specimens When heat treated without interruption in continuous furnaces, the material in a lot shall be the same heat, same prior condition, same size, and subjected to the same heat treatment.
Not fewer than two tension tests are required for each lot containing 20 lb [ kg] or less. Every additional 10 lb [ kg] or fraction thereof requires one additional test.
Each lot shall consist of the following: Diameter, in. In the case of dissatisfaction with the results of the test, the manufacturer may make claim for a rehearing within that time. Product Marking The marking symbol shall be as shown in Table 4 and Table 5. Keywords This testing shall be in addition to tensile testing as speci? The lot size shall be as shown in Failure shall occur in the body or threaded section with no failure, or indications of failure, such as cracks, at the junction of the head and shank.
Nuts Nuts shall conform to Speci? Rejection and Rehearing High Temperature Tests S1. Charpy Impact Tests S2. When testing temperatures are as low as those speci? Hardness Testing of Grade B16 S4.
Product Marking S5. For bolts smaller than 1? Stress Relieving S6. Magnetic Particle Inspection S7. Stress-Relaxation Testing S8. The initial stress shall be 50 M psi [ MPa]. The residual stress at h shall be 17 M psi [ MPa] minimum.