ASTM A193 A320 A325 Alloy steel fasteners bolt nut washer for high temperature

1. Most commonly steel used for fasteners:

Fasteners are often made of steel, but there are many different types of steel. Here are the steels most commonly used for fasteners:

Alloy steels: Steels alloyed with molybdenum, nickel, and chromium (AISI 4037, 4130, 8630) are best if strength is required. These steels also have good cold-forming properties when annealed and can be heat-treated for the best combination of strength, toughness, and shock resistance.

Carbon steels: Fine-grain, fully killed (i.e., completely deoxidized) basic steel with no alloying agent. Low-carbon steels have from 0.06 to 0.22% carbon content (AISI 1008, 1010, 1018, and 1022) and exhibit good ductility for cold-forming. Medium-carbon steels contain 0.30 to 0.50% carbon content (AISI 1038, 1045) and are stronger but less ductile. These steels respond well to quench and temper. High-carbon steels contain 0.50% or more carbon (AISI 1066, 1095). They are difficult to cold-form unless annealed. They do, however, have high strength and can be heat-treated.

2. ASTM A193 A320 A325 Alloy steel fasteners dimension:

3. Common surface treatment for carbon steel and alloy steel grade:

• Nature
• Black
• Hot galvanizing
• Cold galvanizing/ electrogalvanizing
• Cadium plate
• Zinc-Nickel plate
• PTFE coat

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