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Data Sheet:

  Alloy Steel E-4340 

Chemical Composition Limits

Weight % C Mn P&S Si Cr Ni Mo

E4340

Bar

0.38 - 0.43 0.65-0.85

0.025 

Max

0.15-0.30 0.70-0.90 1.65-2.00 0.20-0.30

E4340

Plate

0.38 - 0.43 0.60-0.80

0.025 

Max

0.15-0.35 0.70-0.90 1.65-2.00 0.20-0.30

   

Alloy E 4340 is a widely used deep-hardening constructional steel. Due to E-4340's high alloy content it obtains a uniformed hardness by heat treatment.  The high fatigue strength makes E4340 ideal for highly stress parts as it maintains it's strength and hardness at elevated temperatures.

  

Availability

Alloy E-4340 is available in Bar, Square, Round, Hexagon, Flat, Plates, Forging Stock and Welding Wire. For all stock availability contact Sales.

  

Specifications

UNS G 43406

  

4340 Bars

E4340 VAR

E4340 Plate

MIL-S-5000

AMS 6409 4340 Bar forgings & Tube

AMS 6415 4340 Bar forgings & Tube

AMS 6484 4340 Bar forgings & Tube

AMS-S-5000

ASTM-A-322

ASTM-A-331

MIL-S-8844 CL1

MIL-S-5000

AMS 6414

AMS -S-5000

BMS-7-28

BPS-299-947-055

BPS-299-949-055

AMS 6359

  

HEAT TREATMENT

  

To obtain the highest strength (260,000 psi minimum ultimate)

  

E4340

Normalised

1650ºF - 1700º

Austenitise

1500º - 1600º

Quench

Oil

Temper

700º - 1250º

  

Disclaimer

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

 

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