Steel Metallurgy Properties Specifications And Applications Pdf

AISI/SAE 4-digit code:

Example: SAE 4140 = 0.40% C, 1% Cr, 0.2% Mo.

Standards: ASTM A519, EN 10083.

| Series | Structure | Corrosion Resistance | Example | Application | |--------|-----------|----------------------|---------|-------------| | 300 (Austenitic) | FCC, non-magnetic | Excellent | 304, 316 | Food equipment, chemical plants | | 400 (Ferritic/Martensitic) | BCC, magnetic | Good | 410, 430 | Cutlery, automotive trim | | 200 series | Austenitic, Mn-substituted | Moderate | 201 | Utensils, architectural |

| Process | Description | Effect | |---------|-------------|--------| | Annealing | Slow cooling from high temp | Softens, improves ductility | | Normalizing | Air cooling from high temp | Refines grain, uniform structure | | Quenching | Rapid cooling (water/oil) | Forms martensite (hardness) | | Tempering | Reheating quenched steel | Reduces brittleness, improves toughness | AISI/SAE 4-digit code:

Properties determine how a steel performs under specific conditions.

Modern steel is rarely just iron and carbon. Specific elements are added to alter the metallurgical structure: Example: SAE 4140 = 0

This is the "lookup" section of the resource, teaching you how to read the codes stamped on steel products.

ASTM Standards: Focuses on application and mechanical properties rather than just chemistry.

UNS (Unified Numbering System): A cross-reference system that matches metals from different international standards.

ISO Standards: The international equivalent for global engineering projects.