MIL-S-7809 Steel, High-Strength, Low-Alloy, Bars, Shapes, Sheet, Strip, and Plate See Notice 1 for Replacement InformationThis specification covers high-strength low-alloy hot rolled steel bars, shapes, plates, sheet, and strip products intended primarily for use in welded structures.

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MIL-S-7809A

ard  No. 151 in  accordance  with table V. The location of tensile  test  specimens  shall  be as shown in table  VI.

4.5 Cold bend test.

4.5.1  Sa:m.pling.  Two  specimens  shall  be selected from  each heat.  If  material  from  one heat  differs  by  % inch  or  more. in thickness, one  specimen  shall  be  taken   from  both  the thickest  and  thinnest  material,   regardless  of the  w,eight represented.

4.5.2 Metkod.  Transverse   bend  test  speciD mens   shall   be   tested   in   accordance   with  . Method 231  of  Federal  Test  Method  StandD ard  No.  151.  Specimens  shall  be  bent  cold

through  an  angle  of 180 degrees,  over  a diaD meter   equal   to  the   bend   ratio   times   the thickness   of   the   plate,   sheet,   or   strip   in accordance with table  VII.

4.6 Weldability  test.

4.6.1   Sampling.     One   sample    shall    be selected  to  represent  each lot  of  steel  subD mitted  for  inspection  at  one time,  from  one heat,  of  the  same  condition,  and  when  heat treated,  of the  same  process  and  batch.  The sample  shall  be  o.f sufficient  size  to prepare the  weldability  specimen  shown  in figure  1. The  sample  shall  be  of the  maximum  thickD ness found in  the  lot.

TABLE V. SelectiOll.  of  test  specimens  for  tensile  test.9  from   Fed.   Teat  Method   Std.   No.  l6l

Product or t-                                 Productsize                                    FeelTat                                             Ccnnnient

(inchesth.icld                          HetbodStd. No.1&1

Method!ll  epec.lmen

Bars,   round                                 Under   1.50                 Largest    obtainable    round      When practicable,  test:round

1.50 and  over              Largest    obtainable    round

Bars, ftat                                                                              specimen  (Rt)

Under   1.50                Fl  1  or  F2 1 or  Rl

1.60  and  over             Rl

Plates,    shapes     (incl.   bar-     Under   0.250                Ft1   or  F21  - sized   Shapes)    sheets   or

strips

:

Platea.:  and    shapes     (incl.     0.250  to 1.0                F11                                             If   impracticable,    ase   speci- bar--ized shapes)                                                                                                               men  Rl   or  F2   at  option

of  contractor

Plates'                                       Over  1.0  to  2.0          ai or  F11

Plates                                       Over  2.0                   Rl

"  Option t   P3  niay       be  uaed  la  piece  of  Fl   er  F%.

TABLE  VI.   Loca&n.   &/  tenBils   test  apecimem