General Introduction

The Alloy 20 bars(UNS N08020) manufactured to ASTM B473 can be furnished in several types: (1)hot-finished rounds, square, octagons, and hexagons: 0.25″(6.35 mm) and over in diameter or size; (2)hot-finished flats: 0.25″~10″, inclusive, in width, 0.125″(3.175 mm) and over in thickness; (3)cold-finished rounds, squares, octagons, hexagons, and shapes: over 0.5″ in diameter or size; (4)cold-finished flats: 0.375″(9.525 mm) and over in width, 0.125″ and over in thickness.

Chemical Composition Requirements

The chemical requirements of ASTM B473 Alloy 20 bar are the same as those of ASTM B564 Alloy 20 flanges. Corrosion test in accordance with ASTM A262 Practice A shall be performed per heat.

Mechanical Properties of ASTM B473 Alloy 20 Bars

Heat Treatment	Diameter	Tensile Strength, min.		Yield Strength, min.		Elongation, min.	Reduction of Area
Condition	mm	ksi	MPa	ksi	MPa	in 2", %	min. %
*A	All Sizes	80	551	35	241	30.0	50.0
*B	≤2"	90	620	60	415	15.0	40.0

*A: Alloy 20 hot-finished or cold-finished bars, annealed.
*B: Annealed Alloy 20 bars, strain-hardened.