ASTM A519 / A519M This specification covers for several grades of carbon and alloy steel mechanical tubing, either hot-finished or cold-finished. The steel used in the mechanical tubing may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The seamless tubing is a tubular product made without a welded seam. It is usually manufactured by hot working steel, and if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions and properties.
Seamless mechanical tubing is manufactured from carbon and alloy steels for structural or other mechanical purposes involving machining or heat treating, where close tolerances, smooth finish, or definite physical properties are important factors.
Seamless mechanical tubing is manufactured from carbon and alloy steels for structural or other mechanical purposes involving machining or heat treating, where close tolerances, smooth finish, or definite physical properties are important factors.The steel used in the mechanical tubing may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The seamless tubing is a tubular product made without a welded seam. It is usually manufactured by hot working steel, and if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions and properties.
The steel may be made by any process. If a specific type of melting is required by the purchaser, it shall be as stated on the purchase order. The primary melting may incorporate separate degaussing or refining, and may be followed by secondary melting,such as electroslag or vacuum-arc remelting. If secondary melting is employed, the heat shall be defined as all of the ingots remelted from a single primary heat. Steel may be cast into ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The producer shall remove the transition material by an established procedure that positively separates the grades. Tubes shall be made by a seamless process and shall be either hot finished or cold finished, as specified. Seamless tubing is a tubular product made without a welded seam. It is manufactured usually by hot working steel and, if necessary, by subsequently cold finishing the hotworked tubular product to produce the desired shape, dimensions and properties.
Size range(mm):
Out diameter:10-324mm
Wall Tickness:1-30mm
Length:14000mm max
Grade:
ASTM A519 1020
ASTM A519 1025
ASTM A519 1035
ASTM A519 1045
ASTM A519 4130
ASTM A519 4140
Mechanical properties
| Grade | Tenslle strength(Mpa) | Yield strength(Mpa) | Elongation(%) | RB |
| 4118 | 685 | 885 | 12 | 197 |
| 4130 | 785 | 930 | 12 | 229 |
| 4135 | 835 | 980 | 12 | 229 |
| 4140 | 930 | 1080 | 12 | 217 |
What is the tolerance of cold drawn seamless steel tubes? ? ?
Cold Drawn Seamless stocks are generally carried to OD and ID tolerances, except when the ID is less than 50 percent of the OD. The latter sizes and hot finished seamless stocks are carried in warehouse to OD and wall tolerances.
SPECIAL NOTE: Tolerances are applicable only to two dimensions (length excepted). Thus, if OD and wall are specified, the theoretical ID may not conform to published tolerances except that the mean or average wall (taking into account the permissible OD and ID tolerances) will not vary more than indicated under “DIAMETER AND WALL TOLERANCES.”
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