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4340 Annealed

HOT ROLLED & COLD FINISHED

PACIFIC 4340 is available in two conditions: heat treated (quenched and tempered) to high strength or annealed for ease of machining and subsequent heat treatment. It is a nickel-chromium-molybdenum medium carbon alloy steel with deep hardenability. It can be through hardened in large sections. When properly hardened, 4340 exhibits a good combination of strength, ductility and toughness; this is the material to which other ultra-strength steels are compared. PACIFIC 4340 Heat Treated bars are hardened to 285/331 HB and meet ASTM A 434, Class BD. 4340 is weldable but only with proper precautions; because of its high hardenability, it requires both preheat and post heat in virtually all welding applications. It can be induction hardened or nitrided after quenching and tempering.

CHEMICAL COMPOSITION
Heat Analysis - ranges and limits %

C
.38/.43
Mn
.60/.80
P
.035 MAX
S
.040 MAX
Ni
1.65/2.00
Cr
.70/.90
Mo
.20/.30

TYPICAL PROPERTIES
Approximate - not for specification

over 2-1/2"
thru 4"
Tensile (psi)
140,000
Yield (psi)
110,000
Elongation
14%
over 4"
thru 7"
Tensile (psi)
135,000
Yield (psi)
105,000
Elongation
14%
over 7"
thru 9-1/2"
Tensile (psi)
130,000
Yield (psi)
100,000
Elongation
14%

PROCESSING TEMPERATURES
Typical

Forge
2200°F MAX
Normalize
1550/1650°F
Case Harden
1475/1550°F
Anneal
1475/1575°F
Temper
1200°F & 400°F

Shapes and Conditions Available
Hot Rolled Annealed Rounds through 3" Diameter
Rough Turned Oversize Annealed Rounds from 3-1/4" through 17-1/2" Diameter
Rough Turned Oversize Heat Treated Rounds from 3-5/8" through 10" Diameter