Overview

4340 steel has outstanding harden-ability and high-strength characteristics.  Ideal for highly stressed parts operating under severe conditions, aircraft quality AISI 4340 steel alloy material is excellent for shafts and valves that are subject to extreme conditions.  The term Aircraft Quality (or AQ steel) which all of our steel carries means it is suitable for the production of aircraft parts which are subject to magnetic particle inspection after machining.

Chemistry

4340 Alloy Steel Grade Chemistry
Fe Ni Cr Mn C Mo Si S P
MIN 95.195 1.65 0.70 0.60 0.370 0.200 0.150
MAX 96.33 2.0 0.90 0.80 0.430 0.300 0.300 0.04 0.035

Specs

Form

Flat Bar
,
Plate
,
Round Bar

Incoming Stock

Forms:
Round Bar
Flat Bar
Description Form Thickness / Diameter Width Length Pieces Weight Available Supplier Estimated Due Date
2.000" 4340VAR ALLOY STEEL ROUND BARRound Bar2.000"--144.000"375021.53Latrobe Specialty Metals Company7/5/2019ALLOY STEEL4340VAR
3.500" 4340VAR ALLOY STEEL ROUND BARRound Bar3.500"--144.000"41584.91Carpenter Technology Corporation5/17/2019ALLOY STEEL4340VAR
6.000" 4340VAR ALLOY STEEL ROUND BARRound Bar6.000"--144.000"22302.5Latrobe Specialty Metals Company2/28/2019ALLOY STEEL4340VAR
7.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar7.000"15.000"120.000"13780Latrobe Specialty Metals Company12/21/2018ALLOY STEEL4340VAR
7.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar7.000"15.000"120.000"13780Latrobe Specialty Metals Company2/22/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"115.500"19009Latrobe Specialty Metals Company2/15/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"115.500"218018Latrobe Specialty Metals Company3/22/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"115.500"218018Latrobe Specialty Metals Company4/26/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"115.500"19009Latrobe Specialty Metals Company5/10/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"115.500"19009Latrobe Specialty Metals Company8/9/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"115.500"218018Latrobe Specialty Metals Company11/8/2019ALLOY STEEL4340VAR
13.000" 4340VAR ALLOY STEEL RECTANGLE BARFlat Bar13.000"20.000"120.000"19360Latrobe Specialty Metals Company12/21/2018ALLOY STEEL4340VAR

* Updated in real time

Other Grades