WELDED HYDRAULIC TUBING

SAE J356

SCOPE
This specification covers electric resistance welded, flash controlled,normalized, single wall, low carbon steel pressure tubing. It is intended for use in pressure lines and in other applications requiring tubing of a quality suitable for bending, double flaring, beading, forming and brazing. Material produced to this specification is not intended for single flare applications due to the potential leak path caused by the ID weld bead.

SAE J356 Type-A covers small diameter light wall tubing (typically 5/8” OD x 18Ga and under) that is “in line” annealed, as opposed to J356 where normalizing is performed as a separate operation. Type-A performance requirements are the same as for J356 tubes but the chemical composition ranges for Carbon and Manganese are broader. Type-A tubes are often produced in coil form although they can be cut and straightened through secondary operations.

TESTING
Tubing produced to this specification will be submitted to the following test procedures according to SAE J1677; Flatteneing Test, Flaring Test, Reverse Flattining Test, Expansion Test, Hardenss Test, Tensile Test, Pressure Proof Test and a 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

SAE J356a is manufactured from a single strip of steel shaped into a tubular form by electric resistance welding. After welding, the inside flash is closely controlled by welding techniques or by cutting. Overall ductility and uniform grain structure is achieved by on-line annealing. This standard covers normalized electric resistance welded flash controlled single wall low carbon steel pressure tubing intended for use as pressure lines and in other applications requiring tubing of a quality suitable for bending, double flaring, beading, and brazing.
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TUBING OUTSIDE DIAMETER TOLERANCES, INCHES
Nominal Tubing
OD
Tolerance
±
Nominal Tubing
OD
Tolerance
±
Thru 0.375
      0.0025
Over 2.000-2.500
0.006
Over 0.375-0.625
      0.003
Over 2.500-3.000
0.008
Over 0.625-1.125
      0.0035
Over 3.000-3.500
0.009
Over 1.125-2.000
      0.005
Over 3.500-4.000
0.010
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
MECHANICAL PROPERTIES
Yield strength, minimum
25,000 psi
Ultimate strength, minimum
45,000 psi
Elongation in 2 inches, minimum
35 percent
Hardness (Rockwell B), maximum
65b