High Quality for AISI 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | 817M40 | SNCM439 Manufacturer in Burundi
AISI 4340 steel is a medium carbon, low alloy steel known for its toughness andstrength in relatively large sections. AISI 4340 is also one kind ofnickel chromium molybdenum steels. 4340 alloy steel is generallysupplied hardened and tempered in the tensile range of 930 – 1080 Mpa.Pre hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding. The 4340 steel has goodshockand impact resistance as well as wear and abrasion resistance inthe ...
owing to good service, a variety of high quality products, competitive prices and efficient delivery, we enjoy a good reputation among our customers. We are an energetic company with wide market for High Quality for AISI 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | 817M40 | SNCM439 Manufacturer in Burundi, items won certifications with the regional and international primary authorities. For far more detailed information, please contact us!
AISI 4340 steel
is a medium carbon, low alloy steel known for its toughness and
strength in relatively large sections. AISI 4340 is also one kind of
nickel chromium molybdenum steels. 4340 alloy steel is generally
supplied hardened and tempered in the tensile range of 930 – 1080 Mpa.
Pre hardened and tempered 4340 steels can be further surface hardened by
flame or induction hardening and by nitriding. The 4340 steel has good
shockand impact resistance as well as wear and abrasion resistance in
the hardened condition. AISI 4340 steel properties offer good ductility
in the annealed condition, allowing it to be bent or formed. Fusion and
resistance welding is also possible with our 4340 alloy steel. ASTM 4340
material is often utilized where other alloy steels do not have the
hardenability to give the strength required.For highly stressed parts
it is excellent choice. AISI4340 alloy steelcan also be machined by
all customary methods.
Due to availability the ASTM 4340 grade steel is often substituted
with European based standards 817M40/EN24 and 1.6511/36CrNiMo4 or Japan
based SNCM439 steel. You have the detailed data of 4340 steel below.
1. AISI4340 Steel Specification and Relevant Standards
|Standard||ASTM A29||EN 10250||BS 970||JIS G4103|
2. ASTM 4340 Steels And Equilvalents Chemical Composition
|JIS G4103||SNCM 439/SNCM8||0.36-0.43||0.60-0.90||0.030||0.030||0.15-0.35||1.60-2.00||0.60-1.00||0.15-0.30|
3. AISI Alloy 4140 SteelMechanical Properties
(Heat Treated Condition )
|Tensile Strength MPa||Yield Strength
|Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper||12.3 μm/m°C||6.83 μin/in°F|
|Thermal conductivity (typical steel)||44.5 W/mK||309 BTU in/hr.ft2.°F|
4. Forging of 4340 Alloy Steel
the steel 4340 first, heat up to 1150°C – 1200°C maximum for forging,
hold until temperature is uniform throughout the section.
Do not forge
below 850 °C. 4340 has good forging characteristics but care must be
taken when cooling as the steel shows susceptibility to cracking.
Following forging operation the work piece should be cooled as slowly as
possible. And cooling in in sand or dry lime is recommended etc.
5. AISI 4340 Steel Grade Heat Treatment
- Next: 50% OFF Price For Metal Forms in Rio de Janeiro
pre-hardened steel stress relieving is achieved by heating steel 4340
to between 500 to 550°C. Heat to 600 °C – 650 °C, hold until temperature
is uniform throughout the section, soak for 1 hour per 25 mm section,
and cool in still air.
full anneal may be done at 844°C (1550 F) followed by controlled
(furnace) cooling at a rate not faster than 10°C (50 F) per hour down to
315°C (600 F). From 315°C 600 F it may be air cooled.
4340 alloy steel should be in the heat treated or normalized and heat
treated condition before tempering. The tempering temperature for
depends upon the strength level desired. For strength levels in the 260 –
280 ksi range temper at 232°C (450 F). For strength in the 125 – 200
ksi range temper at 510°C (950 F). And don’t temper the 4340 steels if
it is in the 220 – 260 ksi strength range as tempering can result in
degradation of impact resistance for this level of strength.
Tempering should be avoided if possible within the range 250 °C – 450 °C due to temper brittleness.
Flame or Induction Hardening
As mentioned above, pre-hardened and tempered 4340 steel bars or plates can be further surface hardened by either the flame or induction hardening
methods resulting in a case hardness in excess of Rc 50. AISI 4340
steel parts should be heated as quickly as possible to the austenitic
temperature range (830 °C – 860 °C) and required case depth followed by
an immediate oil or water quenching, depending upon hardness required,
workpiece size/shape and quenching arrangements.
quenching to hand warm, tempering at 150°C – 200°C will reduce stresses
in the case with minimal effect on its hardness.
All de-carburised surface material must first be removed to ensure best results.
and tempered 4340 alloy steel can also be nitrided, giving a surface
hardness of up to Rc 60. Heat to 500°C – 530°C and hold for sufficient
time (from 10 to 60 hours) to develop the depth of case. Nitriding
should be followed by slow cooling (no quench) reducing the problem of
distortion. The nitrided grade 4340 materials can therefore be machined
to near final size, leaving a small grinding allowance only. The tensile
strength of the 4340 steel material core is usually not affected since
the nitriding temperature range is generally below the original
tempering temperature employed.
Surface hardness achievable is 600 to 650HV.
is best done with the alloy steel 4340 in the annealed or normalized
and tempered condition. It can be readily machined by all conventional
methods such as sawing, turning, drilling etc. However in the high
strength conditions of 200 ksi or greater the machinability is only from
25% to 10% that of the alloy in the annealed condition.
of steel 4340 in the hardened and tempered condition (as normally
supplied), is not recommended and should be avoided if at all possible,
because of the danger of quench cracking, as the mechanical properties
will be altered within the weld heat affected zone.
must be carried out, pre-heat to 200 to 300°C and maintain this while
welding. Immediately after welding stress relieve at 550 to 650°C, prior
to hardening and tempering.
If welding in the hardened and
tempered condition is really necessary, then the work piece, immediately
on cooling to hand warm, should be if possible stress relieved at 15 °C
below the original tempering temperature.
8. Application of 4340 Steel
4340 steel is used in most industry sectors for applications requiring
higher tensile/yield strength than 4140 steel can provide.
Some typical applications such as:
Aircraft Landing Gear
Oil and Gas Drilling,
Warm and Cold Forming,
Transfer Systems, like power transmission gears and shafts.
engineering industries and structural use applications, such as: heavy
duty shafts, gears, axles, spindles, couplings, pins, chucks, molds etc.
Hi, we’re here to talk about reshoring the U.S. injection molding industry, and most importantly, show you how you can grow your injection molding business. Reshoring is the process bringing manufacturing back to the U.S. from China and other countries. We help by lowering the cost of tooling for U.S. injection molders. This may seem counterintuitive at first, since we build our molds in China. But the bottom-line is that without competitive costs on tooling, the U.S. loses the entire supply chain to offshore sources. Not only does the tooling move offshore, but the molded parts go along with it.
Now if we lower your tooling costs, and you can win more business, 90% of the manufacturing stays in the U.S. …If your tooling costs aren’t competitive, you win fewer jobs. Having the capacity and staff to produce molds can be a challenge for many custom molders. Particularly with a package of molds. Offshoring CAN be part of the solution. It reduces mold costs by 30-50%. Equally important is the higher capacity found offshore, which results in shorter lead-times. And you can get 3D modeling and tech support at no cost….Most companies that source offshore get their molds from China. To do that you have to locate potential suppliers…Due diligence typically involves a trip to China, or multiple trips… how well do they QC their materials? Can they catch fake resins? How do they test their molds? What documentation do they provide? … Intellectual property laws. Materials & components. Banking. Project management and mold testing… I’m sure you get the point – it’s a real challenge to source a mold from China on your own. So if you’ve sourced molds in China, or you are considering it, you’ve probably concluded that it’s challenging. What does Jade do to help? We BLACK BOX these challenges. We have already addressed the offshore challenges, and put them in a box, so to speak. This lets you focus on your business, and your customers. The goal of this, of course, is to help YOU win more business. We’re eliminating the unknowns, the uncertainty, and the hassles that you have offshore. You benefit from our long history with suppliers in China. We’ve done the screening. And your molds are built with bullet-proof steel certification and resin verification processes. Your mold is tested to YOUR standards. You see, while others focus on giving you first articles that LOOK correct, we focus on giving you a properly built mold that produces the part correctly. We have U.S. engineering and management running the factory in China, to bridge the cultural differences, and make the process seamless for you. This greatly improves communication. Your touch-points – engineering, customer service, and account management, are in the United States. So you’re always interacting with an American team.
We’re a U.S. company – our banking is in the US, and intellectual property protection is covered by U.S. law. This gives you convenience, and added protection, while reducing your uncertainty.
Then there’s simply overall convenience – All interaction is in U.S. English, and meetings are during your working hours. You see with Jade, our expertise also eliminates the intangible challenges – things like culture, communication, and convenience. Now here a few notes to give you a picture of our company. We’ve been in China for 9 years and have over 100 years of combined U.S. engineering expertise. We’ve built-out a new 20,000 square-foot factory in Zhongshan Our mold building capabilities span the entire range – from prototypes to class 101. We build for press sizes from 20 tons to 2,000 tons. We manufacture cooling fixtures, sonic horns and hot stamps – all at a substantial savings for you. We have in-house 3D design & development and engineering support for you. The next logical step would be to have a conversation with us and get a mold quote. To get you on the road to lowering your costs or finding a better China source — We recommend a web-conference that brings together your engineering, operations and purchasing people with Jade’s engineering team and account manager. We’ll go through a sample Design For Manufacturability and a mold design review with you – and discuss the business in general. To get a quote simply email part files and your instructions to your account Rep, or upload them on our website. You will have a quote within 24-48 hours. We’ll do a DFM & design review conference with you on your mold. Ship you the First Shots Ship you the FAR parts & QC documentation. We’ll then ship your mold by the method of your choice. It’s a very straight-forward process. If you’d like to see how you can lower your costs and win more business, give us a try! Contact us at 888-549-6014 or email@example.com We look forward to working with you, and helping you to win more business.
“FD Grip” The No.1 earthquake-resistant rebar coupler in Japan, the highest seismic country, for over 30 years.