10 Years manufacturer AISI 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | 817M40 | SNCM439 Factory for Tunisia
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 goodshock and impact resistance as well as wear and abrasion resistanc...
Reliable quality and good credit standing are our principles, which will help us at a top-ranking position. Adhering to the tenet of "quality first, customer supreme" for 10 Years manufacturer AISI 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | 817M40 | SNCM439 Factory for Tunisia, We sincerely welcome all guests to set up business relationships with us on the basis of mutual benefits. Please contact us now. You will get our professional reply within 8 hours.
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
shock and 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. AISI 4340 alloy steel can 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. AISI 4340 Steel Specification and Relevant Standards
|Standard||EN 10250||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 Steel Mechanical 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
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.
Match: Omaha Lancers vs Chicago Steel
National: Hockey Association
Live broadcast here ⇒ ☛☛ http://bit.ly/2mq1PsU USHL SPORT ☛☛
Date » Sunday, 05 Maret, 2017
Hockey Association Game Omaha Lancers vs Chicago Steel comes to Apple TV with updated app, Washington Wizards vs Washington Wizards Live Streaming free, With the 2016 USHL 2016 campaign set to kick off, Apple on Saturday. Watch the 2016 USHL 2016 on live streaming games on your iPad, mMemphis Grizzliesile device, or computer now Washington Wizards vs Washington Wizards.Today is a sad day for all fans of live sports, as we at StreamFreeLive have to announce that we’re forced to close our website, at least for now. Users outside the Hungary Omaha Lancers vs Chicago Steel can watch USHL 2016 games online, streaming in HD quality.
Omaha Lancers vs Chicago Steel Live Streaming, Watch 2016-2017 all USHL 2016 games live stream online & catch all National USHL games. Omaha Lancers vs Chicago Steel game live stream HD online in ESPN, FoxSports coverage Omaha Lancers vs Chicago Steel game live stream online, CBS Network game live stream Omaha Lancers vs Chicago Steel exclusive USHL. Omaha Lancers vs Chicago Steel exclusive USHL live stream with USHL 2016 network. Depending on the country you live in, find available options to watch live (Hockey Association) USHL games online.
Omaha Lancers vs Chicago Steel live stream kick off the 2016 USHL 2016 live with the annual USHL game. Usually, the starters don’t play much in the first Hockey Association game of the year and this game is an for both teams. The current year’s Omaha Lancers vs Chicago Steel USHL 2016 Game, every year the primary challenge of the year and a part of the festival of the current year. Omaha Lancers vs Chicago Steel Hockey Association USHL 2016 introduction class, will highlight the Omaha Lancers vs Chicago Steel going head to head against.
Watch Omaha Lancers vs Chicago Steel Live Stream USHL 2016 game Online 2016. Watch edigitalplace Washington Wizards vs Washington Wizards Live Stream Online satellite tv coverage, officialtVstream Omaha Lancers vs Chicago Steel Live Stream Online video pc tv. Highlight at delivering television programmes Omaha Lancers vs Chicago Steel online streaming, Omaha Lancers vs Chicago Steel Live Streaming USHL 2016 game online. Order high speed Satellite Internet and TV with Show Hockey Association Live Stream Free with Online 2016-2017 season Washington Wizards vs Washington Wizards match preview.
Omaha Lancers vs Chicago Steel Live Streaming, The Omaha Lancers vs Chicago Steel controlled from start to finish, as quarterback Andrew Luck threw, Omaha Lancers vs Chicago Steel take on the in Week 5 of the 2016 , Omaha Lancers vs Chicago Steel game live online, Watch Omaha Lancers vs Chicago Steel USHL game Omaha Lancers vs Chicago Steel live stream online, Many of those buHockey Associatione guys were among this week’s winners and losers for the Omaha Lancers vs Chicago Steel following. Let’s take a look, Washington Wizards vs Washington Wizards live stream Cable TV Online. Watch Omaha Lancers vs Chicago Steel Free Without Downloading, Omaha Lancers vs Chicago Steel. USHL 2016 (2016-17) regular season game Youtube to be the league’s exclusive partner to deliver the first ever live stream.
Omaha Lancers vs Chicago Steel Hockey Association
Omaha Lancers vs Chicago Steel Live USHL
Omaha Lancers vs Chicago Steel Live Stream
Omaha Lancers vs Chicago Steel watch for free
Omaha Lancers vs Chicago Steel Hockey Association USHL
Omaha Lancers vs Chicago Steel LIVE STREAM USHL
Omaha Lancers vs Chicago Steel LIVE USHL Stream
Omaha Lancers vs Chicago Steel Hockey Association Live Stream
Omaha Lancers vs Chicago Steel online in High Definition
Omaha Lancers vs Chicago Steel Hockey Association all match in one TV
=====================USHL Live Stream========================
Shanghai Bozhong Metal Group was founded in 2006, with 31 million registered fund, It is the leading integrated operator of modern service industry for specialty stainless steel.It is the core construction organization of the Shanghai steel modern service comprehensive pilot area, which was set up by nation’s commerce ministry and Shanghai government.