Specification for ASTM A179 Seamless Tubes and Pipes

ASTM A179/A179M-90a(Reapproved 2001) Cold-drawn seamless mild steel tubes for heat exchangers and condensers
1	Scope	1. this standard applies to tube heat exchangers, condensers and similar heat transfer devices used in the thinnest wall seamless steel tube; 2. this standard applies to 3.2 ~ 76.2mm steel pipe.
2	General requirements	Except as otherwise provided in this standard, all applicable provisions of ASTM A450/A450M shall be met.
3	Surface quality	No iron oxide, other surface quality as per ASTM A450/A450M.
4	Grade and chemical composition(%)	C Mn P S 0.06～0.18 0.27～0.63 ≤0.035 ≤0.035 Note: It is not permissible to supply alloy grades that specifically call for the addition of elements other than those listed above.
5	Hot treatment	After the last cold drawing, heat treatment is carried out at a temperature of not less than 650°C.
6	Hardness Tests	HRB ≤ 72, sampling requirements for each batch of steel pipe from any two steel pipe samples for Rockwell hardness test. (The so-called batch, refers to the same furnace steel production of the same nominal diameter and wall thickness of all steel pipe without cutting. If the batch furnace, the batch refers only to the same furnace number, the same size, the same time the furnace heat treatment of steel pipe; if the continuous furnace, the batch should include the same furnace number, the same size and in the same heat treatment furnace to the same temperature, the same heating time and the same furnace speed for heat treatment of all the steel pipe.)
7	Flattening test	Methods according to ASTM A450/A450M, sampling for each batch of steel pipe or its remaining parts of two steel pipe each cut specimens for testing. (A batch of 250 tubes)
8	Flaring performance	Methods according to ASTM A450/A450M, sampling for each batch of steel pipe or its remaining parts of two steel pipe each cut specimens for testing. (A batch of 250 tubes)
9	Heading performance	S / D <10% of the steel pipe (S is the actual average wall thickness), such as the provisions of the crimp instead of flaring. Methods according to ASTM A450, sampling for each batch of steel pipe or its remaining part of the two steel pipe each cut sample for testing. Not belong to the above provisions of the steel pipe does not need to make crimping test. (A batch of 250 tubes)
10	Hydraulic test	Water pressure by branch, if the demand side agrees to use non-destructive substitution of water pressure. Non-destructive testing according to ASTM A450/A450M.
11	Finished product marking	In addition to ASTM A450/A450M, include the name of the demand side and the order number.

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