J356 TUBE

This specification also covers SAE J356 Type-A tubing. Mechanical properties and performance requirements of standard SAE J356 and SAE J356 Type-A are the same. The differences between Type-A tubing and SAEJ356 tubing are not intended to imply that Type-A tubing is inferior. 

This standard recognizes the manufacturing differences associated with small-diameter, light-weight wall sizes (typically 15.88 mm OD x 1.24 mm wall and smaller). SAE J356 Type-A tubing differs from SAE J356 Type-B tubing in the following ways. Tubing of type A is usually coiled and heat-treated in-line to relieve stress.

When Type-A tubing is produced in coil form, straight Type-A tubing can only be produced by secondary straightening and cutting operations. Straight lengths of SAE J356 are produced and then normalized. Type-A tubing must meet all SAE J356 requirements unless a “Type-A” designation is specified. The Type-A is also available in standard SAE J356 sizes, in which case all the SAE J356 specifications apply.

SAE J356 Type-A covers small diameter, light wall tubing (typically 5/8″ OD x 18Ga and under), as opposed to J356, which is annealed separately. Type-A tubes must meet the same performance requirements as J356 tubes, but their carbon and manganese ranges are wider. Tubes of Type-A are often produced in coil form, although they can be cut and straightened after production.

Electric resistance welded, flash controlled, normalized, single wall, low carbon steel pressure tubing is covered by this specification. In pressure lines and other applications, this tubing is suitable for bending, double flaring, beading, forming, and brazing. Due to the ID weld bead, this material cannot be used for single flare applications.

SAE J356 Type-A covers small diameter, light wall tubing (typically 5/8″ OD x 18Ga and under), as opposed to J356, which is annealed separately. Carbon and Manganese ranges for Type-A tubes are wider than those for J356 tubes. Carbon and Manganese ranges for Type-A tubes are wider than those for J356 tubes. In addition to being produced in coil form, type-A tubes can be cut and straightened through secondary operations.

This specification also applies to SAE J356 Type-A tubing. Mechanical properties and performance requirements are the same for SAE J356 Type-A and Type-B. Coiled and straight material are manufactured differently according to SAE J356 or SAE J356 Type-A. There are nominal reference working pressures listed in ISO 10763 for metric tubing and SAE J1065 for inch tubing. SAE J356 is produced in straight lengths during the secondary heat treat operation. To relieve stress, SAE J356 Type-A tubing is heat treated in-line.

Specifications

SAE-J356

Welded Flash Controlled Low Carbon Steel Tubing Normalized for Bending. Double Flaring and Beading.

Covers normalized electric resistance welded tube ID flash-controlled .005″ to .010″ manipulative quality.

Testing

SAE J1677 requires tubing produced to this specification to undergo the following tests: Flattening Test, Flaring Test, Reverse Flattining Test, Expansion Test, Hardening Test, Tensile Test, Pressure Proof Test, and Nondestructive Electronic Test.

Inside Flash Height

Nominal Wall Thickness

Inches

Maximum Flash Height

Through 1” OD

(Inches)

Maximum Flash Height

Over 1” OD

(Inches)

Less Than .035

.005

.010

.035 Through .065

.008

.010

Greater Than .065

.010

.010

Tubing Outside Diameter Tolerances

Nominal Tube OD (Inches)

Tube OD Tolerance (+/- Inches)

Up to 3/8

.0025

Over 3/8 to 5/8

.003

Over 5/8 to 1-1/8

.0035

Over 1-1/8 to 2

.005

Over 2 to 2-1/2

.006

Over 2-1/2 to 3

.008

Over 3 to 3-1/2

.009

Over 3-1/2 to 4

.010

Tubing Wall Thickness Tolerances

Nominal Wall

Thickness

(Inches)

Nominal Tube OD

Through 1”

(+/- Inches)

Nominal Tube OD

Over 1” Through

2” (+/- Inches)

Nominal Tube OD

Over 2” Through

4” (+/- Inches)

  .028 (22 Ga)

.002/.003

.003/.003

.003/.003

  .035 (20 Ga)

.002/.004

.002/.004

.002/.004

  .042 (19 Ga)

.002/.004

.002/.004

.002/.005

  .049 (18 Ga)

.004/.005

.003/.005

.004/.008

  .058 (17 Ga)

.006/.006

.004/.008

.004/.008

  .065 (16 Ga)

.006/.006

.004/.008

.004/.008

  .072 (15 Ga)

.006/.010

.006/.010

.006/.010

  .083 (14 Ga)

.006/.010

.006/.010

.006/.010

  .095 (13 Ga)

.006/.010

.006/.010

.006/.010

  .100

.006/.010

.006/.010

.006/.010

  .109 (12 Ga)

.006/.010

.006/.010

.006/.010

  .118

.006/.010

.006/.010

.006/.010

  .120 (11 Ga)

.006/.010

.006/.010

.006/.010

  .134 (10 Ga)

.006/.010

.006/.010

.006/.010

  .148 (9 Ga)

.007/.001

.007/.011

  .156 (5/32)

.007/.011

.007/.011

  .165 (8 Ga)

.007/.011

.007/.011

  .180 (7 Ga)

.007/.011

.007/.011

  .197

.008/0.12

.008/0.12

  .203 (6 Ga)

.008/0.12

.008/0.12

  .219 (7/32)

.008/.012

.008/.012

  .236

.014/.018

.014/.018

  .238 (4 Ga)

.014/.018

.014/.018

  .259 (3 Ga)

.014/.020

.014/.020

Chemical Requirements

Element

Cast or Heat Analysis: Weight %

J356

J356 Type-A

Carbon

0.06 Min/0.18 Max

0.02 Min/0.18 Max

Manganese

0.30 Min/0.60 Max

0.10 Min/0.60 Max

Phosphorus

0.04 Max

0.04 Max

Sulfur

0.06 Max

0.05 Max

Mechanical Properties

Properties

Values

Yield Strength (Min)

25,000 PSI

Tensile Strength (Min.)

45,000 PSI

Elongation in 2” (Min)

35% a

Hardness (Rockwell B)(Max)

65 b

a

For tubing having a nominal OD of 3/8” or less, and/or wall thickness of .035” or less, a minimum elongation of 25% is permissible.

b

The hardness test shall not be required on tubing with a nominal wall thickness of less than .065” (16 Ga).

Welded Flash Controlled Low Carbon Steel Tubing

Electric resistance welding shapes a single strip of steel into a tubular shape. In order to control the inside flash after welding, welding techniques or cutting are used. Through on-line annealing, ductility and uniform grain structure are achieved. For pressure lines and other applications requiring tubing of a quality suitable for bending, double flaring, beading, and brazing, normalized electric resistance welded low carbon steel pressure tubing is designed for use as pressure lines.

Tubing Flash Tolerances, Inches

Nominal Wall Thickness

Nominal Tubing Outside Diameter

Thru 1.000

Over 1.000

Maximum Flash Height

Thru 0.035

0.005

0.010

Over 0.035 thru 0.065

0.008

0.010

Over 0.065

0.010

0.010

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