Specialized High-Temperature ASTM A193 B16 Belleville Spring Washer

The Specialized ASTM A193 B16 Belleville Spring Washer (or disc spring) is a conical-shaped component used to introduce and maintain a controlled load or preload in a bolted assembly. It is essential for joints subjected to thermal cycling or vibration where the bolt might otherwise lose tension. Manufactured by Zeron Fasteners from the B16 alloy steel, these washers are used in applications exceeding the temperature limits of standard spring steel, benefiting from the material's superior creep resistance and high yield strength at temperatures over $850^\circ\text{F}$ ($454∘C). The Chromium-Molybdenum-Vanadium composition ensures the washer maintains its spring force (load-deflection curve) and dimensional stability over long operational periods, making it critical for high-integrity flange connections in steam lines, turbines, and thermal power systems.

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ASTM A193 B16 Belleville Spring Washer Chemical Composition

Element Composition (% by Mass)
Carbon (C) 0.37 - 0.49
Manganese (Mn) 0.70 - 1.10
Phosphorus (P) ≤ 0.035
Sulfur (S) ≤ 0.040
Silicon (Si) 0.15 - 0.35
Chromium (Cr) 0.80 - 1.15
Molybdenum (Mo) 0.45 - 0.65
Vanadium (V) 0.25 - 0.35

ASTM A193 B16 Belleville Spring Washer Mechanical Properties

Property Minimum Requirement (Grade B16 Base Material)
Tensile Strength, min 125 ksi (860 MPa)
Yield Strength, min (0.2% offset) 105 ksi (720 MPa)
Elongation in 2 in. (50 mm), min 18%
Reduction of Area, min 50%
Hardness, max (Brinell) 321 HBW
Hardness, max (Rockwell) 35 HRC

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