1.Description
AISI 4340 1.6511 36CrNiMo4 SNCM439 Round Steel Bar Round Bar Round Bar Rod
AISI 4340 steel (UNS G43400) is an ultra-high strength medium carbon low alloy steel, which combines deep hardenability, high ductility, toughness and strength, and has high fatigue resistance and creep resistance. 4340 steel & equivalents: 36CrNiMo4, 1.6511, EN24, SNCM439 etc.
2.Specifications
Steel Grade: AISI 4340 1.6511 36CrNiMo4 SNCM439
Alloy Or Not: Is Alloy
Technique: Hot Rolled
Application: Structural Steel Bar,Die Steel Bar,Tool Steel Bar
Standard: ASTM,DIN,GB,AISI,JIS
Shape: Round
Length: 1m-6m,as Your Request
Material: Die Alloy Steel Round Bars
Surface: Black Or Bright
Product Name: Alloy Steel Round Bar 40Cr 4140 D2 Alloy Steel Round Bars
Diameter: 12mm-650mm
Delivery Condition: Within15 Days After Received The Deposit
High Light: AISI 4340 Alloy Steel Round Bar, 1.6511 Alloy Steel Round Bar
3.Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Mo |
| 36CrNiMo4/1.6511 | 0.32-0.4 | ≤ 0.4 | 0.5-0.8 | ≤ 0.035 | ≤ 0.035 | 0.9-1.2 | 0.9-1.2 | 0.15-0.3 |
4.Similar Standards
| Chinese | American | German | Japanese | British |
| GB | AISI | DIN | JIS | BS |
| 40CrNiMo | SAE4340 | 1.6511 | SNCM439 | EN24 |
5. AISI Alloy 4140 Steel Mechanical Properties
|
Mechannical Properties
(Heat Treated Condition ) |
Condition |
Ruling section |
Tensile Strength MPa |
Yield Strength |
Elong. |
Izod Impact |
Brinell |
|
T |
250 |
850-1000 |
635 |
13 |
40 |
248-302 |
|
|
T |
150 |
850-1000 |
665 |
13 |
54 |
248-302 |
|
|
U |
100 |
930-1080 |
740 |
12 |
47 |
269-331 |
|
|
V |
63 |
1000-1150 |
835 |
12 |
47 |
293-352 |
|
|
W |
30 |
1080-1230 |
925 |
11 |
41 |
311-375 |
|
|
X |
30 |
1150-1300 |
1005 |
10 |
34 |
341-401 |
|
|
Y |
30 |
1230-1380 |
1080 |
10 |
24 |
363-429 |
|
|
Z |
30 |
1555- |
1125 |
5 |
10 |
444- |
1.6511 Steel Application
4340 alloy steel is used to manufacture large and medium-sized plastic molds that require high strength and toughness. And it is used for making important quality controlling parts with good toughness, high strength, and large size, such as heavy machinery and high load shafts, dia of turbine shafts is larger than 250mm, helicopter rotor shafts, turbojet turbine shafts, blades, high-load transmission parts, crankshaft fasteners, gears and etc.
After nitriding, it also can be used to make important parts for special performance requirements. And it will be a great material for high strength and good plasticity parts after low-temperature tempering or isothermal quenching.
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