ASTM A193 Grade B8CA Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from 347 stainless steel.

ASTM A193 Grade B8CA is a standard material specification for corrosion resistant grade 347 stainless steel fasteners such as hex bolts, screws, stud bolts, threaded rods and other externally threaded parts, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8CA is similar to B8C but the latter is carbide solution treated after head formig and the former is carbide solution treated in finished condition. Grade B8CA is classified under tensile Class 1A and has a lower hardness requirement compared to B8C. This specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8CA Fasteners.

Chemical Composition

Element	Austenitic Stainless Steel
	AISI 347
	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.

Mechanical Properties

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.