ASTM A193 Grade B8CLNA Specification

ASTM A193 Grade B8CLNA Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from 347LN stainless steel.

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.

Chemical Composition

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.

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.

Recommended Nuts & Washers

Nut Specification Washer Specification
ASTM A194 Grade 8CLNA ASTM A240 TP347

Fasteners

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