ASTM A193 Grade B8CLNA is a standard material specification for nitrogen enhanced corrosion resistant grade 347LN stainless steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8CLNA is a carbide solution treated 347LN stainless steel classified under class 1A having minimum tensile requirement of 75 ksi, yield 30 ksi and maximum hardness limit of 192 HBW or 90 HRB. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8CLNA Fasteners.
| Element | Austenitic Stainless Steel |
|---|---|
| AISI 347LN | |
| CompositionA, % | |
| Carbon | 0.08 max |
| Manganese | 2.00 |
| Phosphorus | 0.045 max |
| Sulfur | 0.030 max |
| Silicon | 1.00 max |
| Chromium | 17.00 - 19.00 |
| Nickel | 9.00 - 12.00 |
| Columbium + tantalum | 10 x Carbon Content - 1.10 |
AThe intentional addition of Bi, Se, Te, and Pb is not permitted.
| Tensile Class | Diameter, Inch | Tensile Strength, min, ksi |
Yield Strength, min, 0.2% offset, ksi |
Elongation in 4D, min, % |
Reduction of Area, min, % |
Hardness, max |
|---|---|---|---|---|---|---|
| Class 1A | All Sizes | 75 | 30 | 30 | 50 | 192 HBW or 90 HRB |
Heat Treatment: Carbide Solution Treated in Finished Condition.
| Nut Specification | Washer Specification |
|---|---|
| ASTM A194 Grade 8CLNA | ASTM A240 TP347 |
| Commonly Produced B8CLNA Fasteners | ||||
|---|---|---|---|---|
| Hex Bolts | Heavy Hex Bolts | Stud Bolts | Threaded Rods | Anchor Bolts |
| Eye Bolts | Socket Head Cap Screws | Countersunk Screws | U Bolts | Square Head Bolts |