MIL-DTL-12560 Armor Plate, Steel, Wrought, Homogeneous \(For Use In Combat-Vehicles And For Ammunition Testing\)This specification covers wrought-steel homogeneous armor plate for ordered thicknesses from 0.098 inch \(2.5 mm\) up to an ordered thickness of 6.000 inches \(152.4 mm\), inclusive, for use in combat-vehicles and for ordered thicknesses from 0.250 inches \(6.35 mm\) up to an ordered thickness of 12.000 inches \(304.8 mm\), inclusive, for use in proof and acceptance testing of armor defeating ammunition \(see 6.1, 6.2, and 6.3.3\).

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MIL-DTL-12560K (MR)

3.2.6.3 Bend test. Unless otherwise specified in the contract or purchase order (see 6.2), bend

test samples shall be required for a given lot of plates with an ordered thickness of 0.500 inch

and under, and shall be capable of being bent to the requirements specified in Table V without

cracking (see 4.6.1.3, 4.6.2.4 and 4.8.4). For ordered thickness of greater than 0.500 inches a

bend test shall be specified in the contract or purchase order (see 6.2). After bending, samples

shall be free of cracks as determined by visual inspection unless otherwise specified in the

contract or purchase order (see 6.2).

TABLE IV. Minimum Charpy V-notch impact requirements (at -40oF + 2oF)

Minimum impact values (average of three

(3) test specimens), ft-lb

Brinell hardness, BHN

Specimen Size

Inclusive

Exclusive

Standard � width � width � width

210

220

230

240

250

260

270

280

290

300

310

320

330

340

350

360

370

380

470

Table V. Bend test requirements.

Inside Radius

Ordered Plate Thickness (T)

Class 2

Class 1, 3 & 4

0.098 to 0. 500 inches, inclusive

Greater than 0.500 inches

as specified in contract or purchase order (see 6.2)