Uniform rolled Steel (RHA, also known as' Armor Steel ') a term used especially for 4340 Steel plates with a hardness between 250 and 390 BHN, and for casting or rolling thick Armor plates. Specified in ASTM A829, 4340 steel includes nickel for higher overall hardness and superb through hardening. 4340 steel plates are designed for a wide variety of military specifications and structural uses, combat and defense applications. The defensive properties of steel (Armor and ballistic steel）plate are usually compared with those of uniformly rolled steel.
Specification: ASTM A 829
Process: hot rolled
Thickness: 6-115mm
Width: 45-105*505
Heat treatment: Normalizing, annealing, or tempering at high temperature or without heat treatment.
Applications: Armor steel plate 4340 can be used for the manufacturing of military vehicles, structural units with high protection, armaments and other protective parts.
Equivalent Material
ASTM | JIS | DIN | GB |
AISI/ASTM/SAE 4340 | SNCM439 | 36CrNiMo4 | 40CrNi2MoA |
4340 Chemical Composition
C | Si | Mn | P | S | Ni | Cr | Mo |
0.38-0.43 | 0.15-0.35 | 0.6-0.85 | 0.035 | 0.04 | 1.65-2.0 | 0.7-0.9 | 0.2-0.3 |
4340 Mechanical Property
Tensile strengthσb(MPa) | Yield strength σs(MPa) | Elongation | Impact energy -20 ℃ | Hardness, HB |
≥1080 | ≥930 | ≥12 | ≥63 | ≤217HB |
Armor steel plate 4340 is intended for use in applications where required structural application with high protection. World iron&steel is one of the leading 4340 armor steel plate manufacturers and suppliers in China. We manufacture and distribute high-quality alloy steel plates in accordance with standards China GB specified delivery conditions and final customer specifications for industrial and commercial applications. Special sizes and delivery issues can be further negotiated and we provide a wide range of solutions for purchasing departments to select alternative grades, contact us today!