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Help Center4340 Hot Rolled Alloy Structural Steel Plate
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4340 hot rolled alloy structural steel plate
4340 is a 1.8% nickel - chromium - molybdenum high hardenability high tensile steel - generally supplied hardened and
tempered in the tensile range of 930 - 1080 Mpa (condition U) - (Rc 28 - 36)..
Characterised by high strength and toughness in relatively large sections.
Pre hardened and tempered 4340 can be further surface hardened by flame or induction hardening and by nitriding.
4340 is used in most industry sectors for applications requiring higher tensile/yield strength than 4140 can provide.
Typical applications are: Heavy Duty Shafts, Gears, Axles, Spindles, Couplings, Pins etc
Chemical analysis of 4340 steel
C |
Si |
Mn |
P≤ |
S≤ |
Cr |
Ni≤ |
Mo |
0.37~0.45 |
0.10~0.35 |
0.55~0.90 |
0.025 |
0.025 |
0.65~0.95 |
2.00 |
0.20~0.35 |
Compared grades(based on usage)
Chinese |
American |
German |
Swedish |
Japanese |
GB |
AISI |
DIN |
ASSAB |
JIS |
42CrNiMo |
4340 |
1.6511/34nicrmo4 |
|
SNCM439 |
Specification of 4340 steel
Round bar |
Diameter(mm) |
Length (mm) |
|
10~500 |
2000~6000 |
|
|
plate/sheet |
Thickness(mm) |
Width (mm) |
Length (mm) |
10~500 |
80~2300 |
2000~6000 |
4340 Round bar /plate can be supplied as full bar lengths or cut pieces. AISI 4340 ground steel bar can be supplied, providing a quality alloy steel precision ground bar to tight tolerances.
| Forging | Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C. |
| Annealing | Heat the AISI 4340 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling. |
| Stress Relieving | When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening. |
| Hardening | AISI 4340 steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed AISI 4340 should be heated slowly to 840-875°C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature. |
| Tempering | Heat the AISI 4340 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 550-700°C, soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value. |
| Heat Treatment | Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each AISI 4340 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of alloy steel. |
Our Packing is easily loading and unloading. The way of packing has been widely loved by clients.And it can be customized.
Container condition:20'GP: maximum length≤5800mm, maximum weight 25 mts
40'GP: maximum length≤11800mm, maximum weight 25mts
Dongguan Yaoteng Mould steel Co., Ltd is a tool steel stockholders and suppliers of tool steel and mould steel.
On April 12, 2009, Yaoteng began to develop the international market, our products have been exported to Brazil, Turkey , Mexico, Colombia,
Argentina, Dubai, Saudi Arabia, Syria, Iran, Egypt, the Philippines, Indonesia, Malaysia, Vietnam, India and other countries.
Our advantage:
1.Large stocks for various steel grades:Over 5000Mt stock of regular grade and size
2.Competitive price:long term cooperation with most China famous mill to intergrate mills' product line
3.Fast delivery time:Own factories for peeling,milling,grinding and cuting etc
4,Good after-sale service
We have horizontal saw machine, vertical saw machine, CNC flame cutting machine, plane milling machine,
face milling machine, grinding machine equipment to meet customers’ requirements of the steel processing
Send Inquiry to This Supplier
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