SPECIFICATIONS FOR STRUCTURAL NICKEL STEEL. 



508 



5. Check Analyses. A check analysis may be made by the purchaser from finished material 



mini; c.irli mi-It, and this analysis shall conform to the requirements specified in Section 3. 



III. PHYSICAL PROPERTIES AND TESTS. 



6. Tension Tests, (a) Th'e steel shall conform to the following requirements as to tensile 

 pnpertie*: 



TENSILE PPOPERTIES FROM SPECIMEN TESTS. 



Tests of annealed specimens of eye-bars shall be made for information only. 



6 See Section 7. 



* Elongation shall be measured in 2 in. 



(6) The yield point shall be determined by the drop of the beam of the testing machine. 



7. Modifications in Elongation. For plates, shapes and unannealed bars over I in. in thick- 

 ness, a deduction of I from the percentage of elongation specified in Section 6 shall be made for 

 each increase of J in. in thickness above I in., to a minimum of 14 per cent. 



8. Character of Fracture. All broken tension test specimens shall show either a silky or a 

 very fine granular fracture, of uniform color, and free from coarse crystals. 



9. Bend Tests, (a) The test specimen for plates, shapes and bars shall bend cold through 

 1 80 deg. without fracture on the outside of the bent portion, as follows: For material J in. or under 

 in thickness, around a pin the diameter of which is equal to the thickness of the specimen; and for 

 material over J in. in thickness, around a pin the diameter of which is equal to twice the thickness 

 of the specimen. 



(&) The test specimen for pins and rollers shall bend cold through 1 80 deg. around a I in. 

 pin, without fracture on the outside of the bent portion. 



(c) The test specimen for rivet steel shall bend cold through 180 deg. flat on itself without 

 cracking on the outside of the bent portion. 



10. Tests of Angles, (a) Angles with 4 in. legs or under, and ^ in. or under in thickness, 

 shall open flat or bend shut, cold, under the blows of a hammer without cracking. 



(b) Angles with legs over 4 in., or over J in. in thickness, shall open to an angle of 150 deg., 

 or close to an angle of 30 deg., cold, under the blows of a hammer without cracking. 



11. Drift Tests. Punched rivet holes pitched two diameters from a planed edge shall stand 

 drifting until the diameter is enlarged 50 per cent without cracking the metal. 



12. Test Specimens, (a) Tension and bend test specimens shall be taken from the finished 

 rolled or forged material. Specimens for pins shall be taken after annealing. 



(b) Tension and bend test specimens for plates, shapes and bars, except as specified in Para- 

 iph (c), shall be of the full thickness of material as rolled. They may be machined to the form 

 and dimensions shown in Fig. I, or with both edges parallel; except that bend test specimens shall 

 not be less than 2 in. in width, and that bend test specimens for eye-bar flats may have three 

 rolled sides. 



About 18" - -> 



FIG. i. 



(c) Tension and bend test specimens for plates and bars (except eye-bar flats) over ij in. in 

 thickness or diameter may be machined to a thickness or diameter of at least J in. for a length of 

 at least 9 in. 



