Types of Armored Steel Used in Vehicles - Complete Guide

Types of Armored Steel Used in Vehicles - Complete Guide

Types of Armored Steel Used in Vehicles - Complete Guide

In modern armored vehicles (tanks, APCs, MRAPs, cash-in-transit vehicles, etc.), steel remains the most fundamental and reliable armor material. While composite armor, ceramics, titanium alloys and other advanced materials dominate headlines, various high-hardness armored steels continue to be irreplaceable due to their cost-effectiveness, workability, multi-hit capability, and structural strength.

Close-up of thick military armored steel plate

Main Types of Armored Steel Compared

MIL-DTL-46100 High Hardness Armor steel plate

1. MIL-DTL-46100 (High Hardness Armor - HHA)

Hardness: 477–534 HB

The most widely used high-hardness armor steel in military vehicles today, commonly referred to as "46100 steel".

  • Excellent resistance to penetration (stops high-velocity small-caliber AP rounds)
  • Good multi-hit performance
  • Typically used in thicknesses from 3–50 mm

Typical applications: Side/front armor of APCs, MRAP vehicles, add-on armor for light tanks, command vehicles.

AR500 abrasion-resistant armor steel surface

2. Commercial AR500 / AR550 Steel

Hardness: 470–540+ HB (AR500) / 500–550+ HB (AR550)

Originally designed as ultra-wear-resistant steel for mining and heavy machinery, later widely adopted for civilian armored vehicles, shooting range targets, and DIY armor projects.

  • Extremely cost-effective
  • Ballistic performance close to MIL-46100 (but slightly inferior consistency & toughness)
  • More spall/fragmentation — usually requires anti-spall coating

Typical applications: Civilian armored pickups, cash-in-transit vans, budget armor conversions, shooting range protection.

MIL-A-12560 Rolled Homogeneous Armor steel

3. MIL-A-12560 (Class 1–4)

Hardness: ~330–410 HB (Class 1)

The classic military Rolled Homogeneous Armor (RHA) steel — excellent toughness, particularly suitable for blast resistance and large deformation impacts.

  • Class 1 – Kinetic energy protection
  • Class 2 – Blast protection (commonly used for vehicle floors)
  • Class 3/4 – Special applications

Typical applications: Older tank structural components, modern V-shaped blast-resistant hulls, areas requiring good weldability and ductility.

Modern light armored tactical vehicle

4. Ultra-High Hardness / Advanced Armored Steels (Armox® 500T–600T / Ramor 550/600)

Hardness: 500–650 HB

Ultra-high hardness steels from SSAB and other manufacturers — lighter weight with superior protection, commonly used in high-end lightweight armored vehicles.

Typical applications: VIP armored sedans, lightweight high-protection tactical vehicles, modular add-on armor packages.

Quick Comparison Table - Armored Steel Selection Guide

Type Hardness (HB) Weight/Protection Ratio Main Advantages Typical Use
MIL-DTL-46100477–534★★★☆☆Best all-round performanceMilitary mainstream armor
AR500/AR550470–550+★★★☆☆Best value for moneyCivilian/semi-military
MIL-A-12560330–410★★☆☆☆Excellent toughness + blast resistanceUnderbody, blast protection
Armox/Ramor 600 series550–650★★★★☆Lightest + highest protectionPremium lightweight applications

Choosing armor steel is always a difficult trade-off between protection level, weight, cost, and manufacturability.
True top-tier protection is never about a single material — it's a system engineering combination of steel + ceramics + spacing + angles + energy absorption layers.

January 2026 · Armor Knowledge Series

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