ASTM A193 B7 Washers - High-Temperature Fasteners
The ASTM A193 B7 Washer is a crucial component in high-integrity bolting assemblies, designed to evenly distribute the fastener's load and prevent damage to the joint surface, especially in severe operating conditions. Though the B7 specification primarily covers studs and bolts, the washers used alongside them are typically manufactured from similar high-strength, heat-treated Alloy Steel (often AISI 4140) to ensure mechanical compatibility and reliability. Zeron Fasteners specializes in supplying these robust fasteners for applications in the petrochemical, power generation, and oil and gas industries, where resistance to high temperatures and pressures is paramount.
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ASTM A193 B7 Washers Chemical Composition
| Specification | Element | Composition (%) |
|---|---|---|
| AISI 4140 / Compatible Alloy Steel | Carbon (C) | 0.38 - 0.43 |
| Manganese (Mn) | 0.75 - 1.00 | |
| Phosphorus (P) | Max 0.035 | |
| Sulfur (S) | Max 0.040 | |
| Chromium (Cr) | 0.80 - 1.10 | |
| Molybdenum (Mo) | 0.15 - 0.25 |
ASTM A193 B7 Washers Mechanical Properties
| Specification | Property | Value |
|---|---|---|
| Compatible Mechanical Properties (Similar to $\text{ASTM F436}$) | Hardness Range (HB) | 248 - 341 HBW |
| Hardness Range (HRC) | 23 - 38 HRC | |
| Heat Treatment | Quenched and Tempered | |
| Associated A193 B7 Fastener | Tensile Strength, min | 125 ksi (860 MPa) |
| Yield Strength, min | 105 ksi (725 MPa) |