J356 TUBE
SAE J356 Type-A tubing is also covered by this specification. Standard SAE J356 and SAE J356 Type-A have the same mechanical properties and performance requirements. Therefore, the designated differences of Type-A tubing are not intended to imply that Type-A tubing is inferior to standard SAEJ356 tubing.
Its purpose is to recognize the unique manufacturing differences associated with small-diameter, light-weight wall sizes (typically 15.88 mm OD x 1.24 mm wall and smaller). Here are the primary differences between SAE J356 and SAE J356 Type-A tubing. Type-A tubing is heat treated in-line to relieve stress and generally comes coiled.
Straight Type-A tubing can only be produced through secondary straightening and cut-to-length operations when Type-A tubing is produced in coil form. The SAE J356 standard is produced as straight lengths and then undergoes a secondary normalizing operation. Unless a “Type-A” designation is specified, all SAE J356 requirements apply to Type-A tubing. Type-A is also available in standard SAE J356 sizes, in which case all the standard SAE J356 specifications apply.
In contrast to J356, which is annealed separately, SAE J356 Type-A covers small diameter, light wall tubing (typically 5/8″ OD x 18Ga and under). The performance requirements for Type-A tubes are the same as for J356 tubes, but the ranges for Carbon and Manganese are wider. It is common for Type-A tubes to be produced in coil form, although they can be cut and straightened by secondary operations.
The specification covers electric resistance welded, flash controlled, normalized, single wall, low carbon steel pressure tubing. This tubing is suitable for bending, double flaring, beading, forming, and brazing in pressure lines and other applications. This material cannot be used for single flare applications due to the potential leak path caused by the ID weld bead.
In contrast to J356, which is annealed separately, SAE J356 Type-A covers small diameter, light wall tubing (typically 5/8″ OD x 18Ga and under). The performance requirements for Type-A tubes are the same as for J356 tubes, but the ranges for Carbon and Manganese are wider. Type-A tubes have the same performance requirements as J356 tubes, but the ranges for Carbon and Manganese are wider. Type-A tubes are often produced in coil form although they can be cut and straightened through secondary operations.
SAE J356 Type-A tubing is also covered by this specification. SAE J356 Type-A and SAE J356 Type-B have the same mechanical properties and performance requirements. As defined by the SAE J356 or SAE J356 Type-A designation, coiled and straight material are manufactured differently. This tubing has nominal reference working pressures listed in ISO 10763 for metric tubing and SAE J1065 for inch tubing. During the secondary heat treat operation, SAE J356 is produced in straight lengths. A coil of SAE J356 Type-A tubing is heat treated in-line to relieve stresses.
Specifications
Testing
According to SAE J1677, tubing produced to this specification will be subjected to the following tests: Flattening Test, Flaring Test, Reverse Flattining Test, Expansion Test, Hardening Test, Tensile Test, Pressure Proof Test and a Nondestructive Electronic Test.
Inside Flash Height
Tubing Outside Diameter Tolerances
Tubing Wall Thickness Tolerances
Chemical Requirements
Mechanical Properties
Welded Flash Controlled Low Carbon Steel Tubing
A single strip of steel is shaped into a tubular shape by electric resistance welding. Welding techniques or cutting are used to control the inside flash after welding. By annealing on-line, ductility and uniform grain structure are achieved. Normalized electric resistance welded low carbon steel pressure tubing is designed for use as pressure lines and in other applications requiring tubing of a quality suitable for bending, double flaring, beading, and brazing.
Tubing Flash Tolerances, Inches