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ATI Allegheny Ludlum K12® Dual Hardness Steel

Category Metal , Ferrous Metal , Carbon Steel
Manufacturer ATI Allegheny Ludlum
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ATI Allegheny Ludlum K12® Dual Hardness Steel.pdf
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Material Notes:
This is a roll bonded, dual hardness armor plate consisting of a high hardness front side to break up or flatten incoming projectiles while the back side functions to capture the projectile.The composition of both faces is a Ni-Mo-Cr steel, but the front side has a higher carbon content, which leads to a higher hardness after heat treatment. The front and back sides are roll bonded by a multi-step, proprietary process which involves heating the assembly to a specific temperature and hot rolling it until the two sides develop a strong, metallurgical bond. The roll-bonded plates are annealed, sheared, and flattened. A careful and precise heat treatment is required to achieve optimum ballistics performance.Information provided by Allegheny Ludlum.
Physical Properties Metric English Comments
Density 7.86 g/cc
0.284 lb/in³
Mechanical Properties Metric English Comments
Hardness, Brinell 233 - 286
233 - 286
Annealed; Soft Side
293
293
Annealed; Hard Side
Hardness, Rockwell C 48 - 54
48 - 54
Heat Treated; Soft Side
58 - 64
58 - 64
Heat Treated; Hard Side
Tensile Strength, Ultimate 1020 MPa
148000 psi
Average Annealed
Tensile Strength, Yield 896 MPa

@Strain 0.200 %
130000 psi

@Strain 0.200 %
Elongation at Break 14.5 %
14.5 %
Average Annealed
Compressive Yield Strength 1610 MPa
234000 psi
0.2%; Average Transverse Hardened
1640 MPa
238000 psi
0.2%; Average Longitudinal Hardened
Charpy Impact 16.3 - 17.6 J
12.0 - 13.0 ft-lb
0.009" V-Notch in soft side; struck on hard side; Heat Treated
Charpy Impact, Unnotched 209 J
154 ft-lb
Heat Treated
Thermal Properties Metric English Comments
CTE, linear 11.5 µm/m-°C

@Temperature 21.0 - 93.0 °C
6.39 µin/in-°F

@Temperature 69.8 - 199 °F
Specific Heat Capacity 0.481 J/g-°C

@Temperature 21.0 - 93.0 °C
0.115 BTU/lb-°F

@Temperature 69.8 - 199 °F
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000260 ohm-cm

@Temperature 0.000 °C
0.0000260 ohm-cm

@Temperature 32.0 °F
0.0000310 ohm-cm

@Temperature 100 °C
0.0000310 ohm-cm

@Temperature 212 °F
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