ASTM A3-2019 pdf free download

ASTM A3-2019 pdf free download.Standard Specification for Steel Joint Bars, Low, Medium, and High Carbon (Non-Heat- Treated)
1. Scope
1.1 This specification covers steel joint bars for connecting steel rails in mine, industrial, and standard railroad track. 1.2 Three grades of joint bars are defined for applications where non-heat treated bars are suitable: 1.2.1 Grade 1, low-carbon, primarily for industrial and mine use. 1.2.2 Grade 2, medium-carbon, primarily for industrial and mine use. 1.2.3 Grade 3, high-carbon, for general use in standard railroad track. They may be used in the production of insulated track joints. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Ordering Information
3.1 Orders for joint bars under this specification shall include the following information as appropriate: 3.1.1 Quantity—number of pairs of bars, 3.1.2 Type—design or type bar along with section designa- tion and weight of rails being joined, 3.1.3 Grade—in accordance with 1.2 and Table 1 and Table 2, 3.1.4 Dimension—overall length, 3.1.5 Punching—type (elliptical, oval, round, or combinations), size, number, location, spacing, and elevation of punched holes, with dimensional drawing if necessary, 3.1.6 Special Requirements—notching, shearing, bundling, etc., including details, and 3.1.7 Certification and Test Report Requirements—(see Sec- tion 11).
4. Manufacture
4.1 The steel shall be made by one or both of the following processes: basic-oxygen or electric-furnace. 4.1.1 The steel may be cast by a continuous process, or in ingots. 4.2 Grade 2, medium-carbon, joint bars may be punched, slotted, and shaped in the case of special designs, either hot or cold. Joint bars that are punched, slotted, or shaped cold shall be subsequently annealed. 4.3 Grade 3, high-carbon, joint bars shall be uniformly heated for punching, slotting, and shaping.
5. Chemical Requirements
5.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 1. 5.2 Heat or Cast Analysis—An analysis of each heat or cast shall be made by the manufacturer to determine the percent- ages of carbon, manganese, phosphorus, and sulfur. The analysis shall be made from a test sample taken preferably during the pouring of the heat or cast. The chemical composi- tion thus determined shall conform to the requirement in Table 1. Manganese and sulfur determinations are for information only.5.3 Product Analysis—When ladle tests are not available, finished material representing the heat may be product tested. The product analysis allowance beyond the limits of the specified ladle analysis shall be within the limits for product analyses specified in Table 2. 5.3.1 An analysis may be made by the purchaser from a sample taken from a finished joint bar representing each heat or cast. The chemical composition thus determined shall conform to the requirements in Table 1.
6. Tensile Requirements
6.1 Properties—The material as represented by a tension test specimen shall conform to the tensile properties prescribed in Table 3. 6.2 Test Specimen—The tension test specimen shall be taken from the middle ofthe head at the center ofa finished joint bar. The specimen shall be machined to the form and dimensions for a standard round tension test specimen with 2-in. or (50-mm) gage length, as described in Test Methods and Definitions A370. 6.3 Number ofTests—One tension test shall be made from each heat or cast of steel. 6.4 Retests—If the results of the tension test fail to meet the requirements specified, a retest shall be permitted on two random specimens from the lot. Both shall conform to the requirements specified in Table 3. 6.4.1 If any test specimen fails because of mechanical reasons such as failure of testing equipment or improper specimen preparation, it may be discarded and another speci- men taken.