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4340 N&T (Normalized & Tempered) - Fry Steel

Aircraft Alloys / 4340 N & T

4340 N&T (Normalized & Tempered) is an aircraft quality extremely high strength medium carbon low alloy steel that has been normalized and then tempered for stress relief. This alloy exhibits deep hardenability, high ductility, toughness and strength. The material has high fatigue resistance and creep resistance. After tempering, flame or induction hardening will produce material with Rc 50, while nitriding will produce Rc 60. 4340 is used in products such as piston pins, bearings, ordnance, gears, dies, and pressure vessels. (UNS G43400)

Chemical Makeup of 4340 N&T

Element	Min	Max
Carbon, C	0.38	0.43
Manganese, Mn	0.65	0.85
Silicon, Si	0.15	0.35
Phosphorus, P	-	0.015
Sulfur, S	-	0.008
Chromium, Cr	0.7	0.9
Molybdenum, Mo	0.2	0.3
Nickel, Ni	1.65	2
Copper, Cu	-	0.35
Aluminum, Al	0.02	0.05
Vanadium, V	0.02	0.08
Columbium/Niobium, Nb	0.02	0.05

Common Applications of 4340 Normalized & Tempered

Aerospace
Industrial

Benefits

Extremely High Strength
Deep Hardenability
High Ductility
High Fatigue Resistance
High Creep Resistance

We stock 4340 N & T to the following specifications:

AMS-2301
AMS-2304
AMS-2310
AMS-6409
AMS-6415
AMS-6484
AMS-S-5000
ASTM-A-322
ASTM-A-331
BMS-7-28 (CHECK T.R.)
DMS-1555 GRD B (CHECK T.R.)
MIL-S-5000

Click on a cross-section to see the sizes we stock:

Flat
hex
Round
Square

Aircraft Alloys
4340 N & T
Flat
77 sizes and conditions:

CD - Cold Drawn HR - Hot Rolled HR - Hot Rolled
1/4 X 1 - CD
1/4 X 1-1/2 - CD
1/4 X 2 - CD
3/8 X 2 - CD
3/8 X 3 - CD
1/2 X 1 - CD
1/2 X 1-1/2 - CD
1/2 X 2 - CD
1/2 X 2-1/2 - CD
1/2 X 3 - CD
1/2 X 4 - CD
1/2 X 6 - CD
5/8 X 1 - CD
5/8 X 1-1/2 - CD
5/8 X 2 - CD
5/8 X 4 - CD
3/4 X 1 - CD
3/4 X 1-1/2 - CD
3/4 X 2 - CD
3/4 X 3 - CD
3/4 X 4 - CD
3/4 X 6 - CD
1 X 1-1/4 - CD
1 X 1-1/2 - CD
1 X 2 - CD
1 X 2-1/2 - CD
1 X 3 - CD
1 X 4 - CD
1 X 5 - CD
1 X 6 - CD
1-1/4 X 1-1/2 - CD
1-1/4 X 2 - CD
1-1/4 X 2-1/2 - CD
1-1/4 X 3 - CD
1-1/4 X 4 - CD
1-1/4 X 5 - CD
1-1/4 X 6 - CD
1-1/2 X 2 - CD
1-1/2 X 2-1/2 - CD
1-1/2 X 3 - CD
1-1/2 X 4 - CD
1-1/2 X 5 - CD
1-1/2 X 6 - CD
1-3/4 X 3 - CD
1-3/4 X 4 - CD
2 X 2-1/2 - CD
2 X 3 - CD
2 X 4 - CD
2 X 5 - CD
2 X 6 - CD
2-1/2 X 3 - CD
2-1/2 X 3-1/2 - CD
2-1/2 X 4 - CD
2-1/2 X 5 - CD
2-1/2 X 6 - CD
3 X 4 - CD
3 X 5 - CD
3 X 6 - CD
1-3/4 X 3 - HR
1-3/4 X 4 - HR
2 X 2-1/2 - HR
2 X 3 - HR
2 X 3-1/2 - HR
2 X 4 - HR
2 X 6 - HR
2-1/2 X 3 - HR
2-1/2 X 3-1/2 - HR
2-1/2 X 4 - HR
2-1/2 X 5 - HR
2-1/2 X 6 - HR
3 X 4 - HR
3 X 5 - HR
3 X 6 - HR
3-1/2 X 6 - HR
4 X 5 - HR
4 X 6 - HR

Aircraft Alloys
4340 N & T
Round
106 sizes and conditions:

CD - Cold Drawn DG&P - DG&P - HR - Hot Rolled HR - Hot Rolled T-CD TL - T-CD TL - T-HR TL - T-HR TL - TG&P - TG&P -
1/4 - CD
.260 - DG&P
5/16 - CD
.3225 - DG&P
3/8 - CD
.385 - DG&P
7/16 - CD
.4475 - DG&P
1/2 - CD
.510 - DG&P
9/16 - CD
.5725 - DG&P
5/8 - CD
.635 - DG&P
11/16 - CD
3/4 - CD
.760 - TG&P
13/16 - CD
7/8 - CD
.885 - TG&P
15/16 - CD
1 - CD
1.010 - TG&P
1-1/16 - CD
1-1/8 - CD
1.135 - TG&P
1-3/16 - CD
1-1/4 - CD
1.260 - TG&P
1-5/16 - CD
1-3/8 - CD
1-7/16 - CD
1-1/2 - T-CD TL
1-9/16 - T-CD TL
1-5/8 - T-CD TL
1-3/4 - T-CD TL
1-7/8 - T-CD TL
2 - T-CD TL
2-1/8 - T-CD TL
2-1/4 - T-CD TL
2-3/8 - T-CD TL
2-1/2 - T-CD TL
2-5/8 - T-CD TL
2-3/4 - T-CD TL
3 - T-CD TL
3-1/8 - T-CD TL
3-1/4 - T-CD TL
3-1/2 - T-CD TL
3-3/4 - T-CD TL
4 - T-CD TL
4-1/4 - T-CD TL
4-1/2 - T-CD TL
1 - HR
1-1/8 - T-HR TL
1-1/4 - T-HR TL
1-3/8 - T-HR TL
1-1/2 - T-HR TL
1-5/8 - T-HR TL
1-3/4 - T-HR TL
1-7/8 - T-HR TL
2 - T-HR TL
2-1/8 - T-HR TL
2-1/4 - T-HR TL
2-3/8 - T-HR TL
2-1/2 - T-HR TL
2-5/8 - T-HR TL
2-3/4 - T-HR TL
2-7/8 - T-HR TL
3 - T-HR TL
3-1/8 - T-HR TL
3-1/4 - T-HR TL
3-3/8 - T-HR TL
3-1/2 - T-HR TL
3-3/4 - T-HR TL
3-7/8 - T-HR TL
4 - T-HR TL
4-1/4 - T-HR TL
4-1/2 - T-HR TL
4-3/4 - T-HR TL
5 - T-HR TL
5-1/4 - T-HR TL
5-1/2 - T-HR TL
5-3/4 - T-HR TL
6 - T-HR TL
6-1/4 - T-HR TL
6-1/2 - T-HR TL
6-3/4 - T-HR TL
7 - T-HR TL
7-1/4 - T-HR TL
7-1/2 - T-HR TL
7-3/4 - T-HR TL
8 - T-HR TL
8-1/4 - T-HR TL
8-1/2 - T-HR TL
9 - T-HR TL
9-1/2 - T-HR TL
10 - T-HR TL
10-1/2 - T-HR TL
11 - T-HR TL
12 - T-HR TL
13 - T-HR TL
14 - T-HR TL
16 - T-HR TL
18 - T-HR TL
20 - T-HR TL

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Materials

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4340 N&T (Normalized & Tempered) - Fry Steel

Chemical Makeup of 4340 N&T

Common Applications of 4340 Normalized & Tempered

Benefits

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