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Annealed



4340 is a highly alloyed steel with high nickel and chromium content which assures deep hardening when oil quenched, with high strength characteristics throughout the section. Used for heavily stressed parts operating under strenuous conditions.

TYPICAL ANALYSIS

AISI 4340

Carbon (C)

.38A43

Manganese (Mn)

.60/.80

Silicon (Si)

.15/.35

Molybdenum (Mo)

.20/.30

Chromium (Cr)

70/.90

Nickel (Ni)

1.65/2.00

Sulphur (S)

.040 MAX

Phosphorus (P)

.035 MAX

HEAT TREATMENT

Oil Quenched from

1550F(828C)

Temper as shown:
1 Round (center)

Tensile

Yield

BHN

RC

800

208,000

200,000

415

44

1000

174,000

163,000

352

38

1200

142,000

124,000

285

30

4 Round (1/2 radius)

Tensile

Yield

BHN

RC

800

193,000

184,000

401

42

1000

170,000

159,000

341

37

1200

136,000

119,000

269

28

Quench: 1475 to 1550

Anneal: 1475 to 1700

Available in Annealed and Q&T machinable state.

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