ASTM A193 Grade B8LN Specification for high tensile bolts, screws, stud bolts, anchor bolts, threaded rods and other externally threaded fasteners, made from 304LN stainless steel.

ASTM A193 Grade B8LN is a standard material specification for nitrogen enhanced corrosion resistant 304LN stainless steel fasteners, for use in high tensile, high temperature and special purpose applications such as pressure piping & pressure vessels bolting. Grade B8LN is a heat-treated, work-hardened (or both) austenitic stainless steel further divided into class 1, & class 1D, having a similar strength requirement. ASTM A193 specification covers requirements for chemical composition, mechanical properties, hardness, heat-treatment and recommended nuts-washers for Grade B8LN Fasteners.

Tensile Class

Property	Description
Class 1	Carbide Solution Treated
Class 1D	Carbide Solution Treated

Chemical Composition

Element	Austenitic Stainless Steel
	AISI 304LN / UNS S30453
	CompositionA, %
Carbon	0.03 max
Manganese	2.00
Phosphorus	0.045 max
Sulfur	0.030 max
Silicon	1.00 max
Chromium	18.00 - 20.00
Nickel	8.00 - 11.00
Nitrogen	0.10 - 0.16

A; The 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, maxA
								Class 1	All Sizes	75	30	30	50	223 HBW or 96 HRB
						Class 1D	All Sizes	75	30	30	50	223 HBW or 96 HRB

Heat Treatment: Carbide Solution Treated
A: For sizes 3⁄4 in. in diameter and smaller, a maximum hardness of 241 HBW (100 HRB) is permitted.