AISI 4340 1.6582 SNCM439 34CrNiMo6 Alloy Steel Plate Block Round Bar Stock

Product Description

Spare Parts Alloy Steel with AISI 4340 1.6582 Sncm439 Flat Steel Plate Sheet Block Round Bar 34CrNiMo6 

 

Product Description

 

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

Heat Treatment

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
 

 

Applications

 

 

Summary:Why Choose NSPM 4340

• Stable supply from leading domestic and overseas tool steel mills

• Complete tool steel grade portfolio

• Competitive pricing advantage

• Large stock and flexible cutting services

• Flexible delivery and supply solutions

• Professional technical support
 

Company Profile

 

FAQ

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.


Q2: Are you a manufacturer or a trader? 
A2: For Special Steel, we are the one of the leading distributors and service center in China. 9 warehouses with over 50,000 tons of regular stock. Our workshop has various kinds of equipments for sawing, milling, grinding, drilling etc.
For mold base, we are a professional manufacturer, with 24 sets of CNC machines, 3 axis and 5 axis, CMM for inspection. We produce medium-large sized mold base for plastic injection mold and die casting die.


Q3: How do you control the quality of steels?
A3: Firstly, we have very close and deep relationship with Chinese Prime Mills, choose supplier carefully, and regard them as the long term business partner. Based on the long term cooperation, we concentrate on special steel business and expand the market step by step. Secondly, we have own technical center which is formed by the experienced engineers and technicians whom ever worked for prime mills. We control the quality in production process, in-out warehouse.


Q4: Which kind of processing can you do?
A4: We do machining processing like cutting, milling, grinding, turning, peeling, drilling, CNC machining. Meanwhile, we do vacuum heat treatment for die and mold.