1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 07 22 Revised Updated and renumbered 1989 05 31 B/031524TC Revised clause 3.3 1988 01 06 SM/ER1739TC Released R.V. Lebeck K. Gribble NAAO. M Prasser EAO. Printed copies are uncontrolled Page 1 of 3 Copy
2、right 2002, Ford Global Technologies, Inc. TUBING, WELDED LOW CARBON STEEL WSA-M1A308-A1 TUBING, BRAZED DOUBLE WALL LOW CARBON STEEL WSA-M1A308-A2 1. SCOPE These specifications define tubing manufactured by forming steel strip into a cylindrical form and copper brazing in a reduction atmosphere, or
3、by electric welding steel strip. 2. APPLICATION These specifications were originally released for hydraulic brake, fuel, vacuum, oil cooler, and air brake lines. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Stan
4、dard Requirements For Production Materials (WSS-M99P1111-A). 3.2 MATERIAL The tubing shall be made from low carbon steel, such as UNS 10100, JIS G 3141, DIN CK10, BS 040A10, SAE J 403 1010 or a similar approved steel. 3.3 CONSTRUCTION OPTIONS WSA-M1A308-A1 Type 1 WSA-M1A308-A2 Types 2 and 3 SINGLE W
5、ALL CONSTRUCTION Type 1 Butt welded ENGINEERING MATERIAL SPECIFICATION WSA-M1A308-A1/A2 Page 2 of 3 Copyright 2002, Ford Global Technologies, Inc. DOUBLE WALL 360 DEGREE BRAZED CONSTRUCTION Type 2 Type 3 Single Strip Double Strip 3.4 HYDROSTATIC/PNEUMATIC PRESSURE TESTS Each tube shall be capable of
6、 withstanding without bursting or leaking, an internal hydrostatic pressure sufficient to subject the material to a fiber stress of 140 MPa. The hydrostatic pressure is to be determined by the formula; PD = 2St Where P = Hydrostatic pressure in MPa t = Wall thickness of tubing in mm D = Outside diam
7、eter of tubing in mm S = Allowable fiber stress In lieu of the hydrostatic test, welded tubing may be subjected to an air under water or air pressure decay test at 1.5 to 2.0 MPa pressure without leaking or bursting. 3.5 EDDY CURRENT TEST All tubing manufactured to this specification shall be 100% n
8、ondestructive, eddy current tested to ensure uniform quality. If defects are noted, immediate action must be taken to identify and remove the irregularity. In addition to the eddy current test, a prescribed program of physical tests and visual inspection is to be conducted at regular intervals for a
9、dditional assurance that tubing is of uniform quality. 3.6 MECHANICAL PROPERTIES Yield Strength (0.2% offset) 170 MPa min. Tensile Strength 290 MPa min. Elongation in 50 mm 14-40% * Hardness, Rockwell 30T 68 max. * NOTE The Rockwell hardness test shall be made on the inside surface of a specimen cut
10、 longitudinally from the tubing. Test shall be made at points away from the seams. ENGINEERING MATERIAL SPECIFICATION WSA-M1A308-A1/A2 Page 3 of 3 Copyright 2002, Ford Global Technologies, Inc. 3.7 FLARING TEST A section of tubing approximately 100 mm in length shall stand being expanded over a mand
11、rel having a taper of 25 mm in 250 mm until the outside diameter at the expanded end is increased 20 percent without cracking and showing flaws. The tube axis must be parallel to center of mandrel during this test. 3.8 BENDING PROPERTIES A suitable length of tubing shall stand being bent around a cy
12、lindrical mandrel through 360 degrees without kinking, cracking or developing other flaws. The diameter of the mandrel shall be as follows Tube diameter Mandrel diameter 8 mm and under 3 x tube diameter Over 8 mm to 10 mm incl. 6 x tube diameter Over 10 mm to 15 mm incl. 8 x tube diameter 3.9 INTERN
13、AL CLEANLINESS (FLTM BZ 2-1) 0.020 g max of metallic and other nonsoluble materials per 3 m of tubing. 3.10 DIMENSIONS The tube dimensions shall be specified on the engineering drawing. Tolerances shall conform to SAE Standards. SAE J 526 for single wall tubing and SAE J 527 for double wall tubing.
14、4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 SPECIAL FINISHES (FOR CORROSION PROTECTION) Special finishes such as paint, plating, and chromate conversion coatings will be required on the majority of tubing produced to this specification to prevent the formation of corrosion products. In these cases the special finish shall be marked accordingly on the engineering drawing.
