| Customization: | Available |
|---|---|
| Type: | Sheet |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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Spare Parts Alloy Steel with AISI 4340 1.6582 Sncm439 Flat Steel Plate Sheet Block Round Bar 34CrNiMo6
Equivalence
| AISI / SAE | DIN / W.Nr | JIS | GB | |
| 4340 | 34CrNiMo6 (1.6582) | SNCM439 | 40CrNiMoA | |
| Other designations that are equivalent to AISI 4340 alloy steel include the following: | ||||
| AMS 6359 | AMS 6454 | ASTM A331 (4340) | ASTM A711 | SAE J1397 (4340) |
| AMS 6409 | ASTM A29 (4340) | ASTM A506 (4340) | ASTM A752 (4340) | SAE J404 (4340) |
| AMS 6414 | ASTM A320 (L43) | ASTM A519 (4340) | ASTM A829 | SAE J412 (4340) |
| AMS 6415 | ASTM A322 (4340) | ASTM A646 (4340-7) | MIL S-5000 | |
Chemical Composition (%)
| Steel Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| 34CrNiMo6 | 0.30-0.38 | ≤ 0.40 | 0.50-0.80 | ≤ 0.025 | ≤ 0.035 | 1.30-1.70 | 0.15-0.30 | 1.30-1.70 |
| 1.6582 | ||||||||
| 4340 | 0.38-0.43 | 0.15-0.35 | 0.60-0.80 | ≤ 0.035 | ≤ 0.040 | 0.70-0.90 | 0.20-0.30 | 1.65-2.00 |
| SNCM439 | 0.36-0.43 | 0.15-0.35 | 0.60-0.90 | ≤ 0.025 | ≤ 0.025 | 0.60-1.00 | 0.15-0.30 | 1.60-2.00 |
| 40CrNiMoA | 0.37-0.44 | 0.17-0.37 | 0.50-0.80 | ≤ 0.025 | ≤ 0.025 | 0.60-0.90 | 0.15-0.25 | 1.25-1.65 |
Supply Specifications
| Condition | Processing Route |
Tolerance Range |
Surface Quality |
Application Notes |
| Black | / | Rolled: +3~5 mm Forged: +10~20 mm |
Hot-rolled black scale surface | Economical choice for large volume orders |
| Rough Machined |
Milled 4 sides + Rough ground 2 sides
|
Rolled: +0~1 mm Forged: +0~5 mm |
Clean surface no heavy scale |
Pre-machined surface ready for further processing |
| Fully Machined |
6 sides precision milled + ground |
+0.05~0.1 mm | Surface roughness Ra1.6 | Ready for direct CNC machining |
| Ground Finish |
6 sides fine ground | +0.02~0.05 mm |
Mirror finish
|
For high-precision molds |
| Custom cutting service available according to drawings | ||||
Machinability
AISI 4340 alloy steel can be machined using all conventional techniques. Machining process can be performed in the annealed or normalized and tempered conditions.
Forming
AISI 4340 alloy steel has good ductility and formability in the annealed condition. It can be bent or formed by pressing or spinning in the annealed state.
Welding
AISI 4340 alloy steel can be welded using fusion or resistance welding methods. Preheat and post heat weld procedures are followed while welding this steel by established methods.
Heat Treatment
AISI 4340 alloy steel is heat treated at 830°C (1525°F) followed by quenching in oil.
Forging
AISI 4340 alloy steel is forged at 427 to 1233°C (1800 to 2250°F).
Cold Working
AISI 4340 alloy steel can be cold worked using all conventional methods in the annealed condition. It has high ductility.
Annealing
AISI 4340 alloy steel is annealed at 844°C (1550°F) followed by cooling the furnace.
Tempering
AISI 4340 alloy steel should be in the heat treated or normalized and heat treated condition before tempering. Tempering temperatures depend upon the desired strength level.
Hardening
AISI 4340 alloy steel can be hardened by cold working or heat treatment.
Technical Parameters
Q1: What is Ningbo Ningshing Precision Machinery Group Co., Ltd ?
A1: Ningbo Ningshing Precision Machinery Group Co., Ltd., formerly known as Ningbo Ningshing Special-Steel Group Co., Ltd., is the leading distributor of Special Steel, and also a professional mold base maker in China. Our business involves special steel trading, machining processing, mold base making, heat treatment, CNC machines manufacturing.
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