AISI 4340, 1.6511, Sncm439 Steel Bar
1: AISI 4340 steel introduction
4340 is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.This alloy, 4340, may be heat treated to high strength levels while maintaining good toughness, wear resistance and fatigue strength levels, combined with good atmospheric corrosion resistance, and strength.
2: AISI 4340 Steel equivalent
| Country |
China |
Japan |
Germany |
USA |
UK |
| Standard |
GB/T 3077 |
JIS G4105/JIS G4103 |
EN 10250 |
ASTM A29 |
BS 970 |
| Grade |
40CrNiMoA |
SNCM 439/SNCM8 |
36CrNiMo4/1.6511 |
4340 |
EN24/817M40 |
3: AISI 4340 steel chemical composition
| Grade |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
| 40CrNiMoA |
0.37 - 0.44 |
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| SNCM 439/SNCM8 |
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| 36CrNiMo4/1.6511 |
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| 4340 |
0.38-0.43 |
0.15 - 0.3 |
0.6 - 0.8 max |
0.035 max |
0.040 max |
0.7 - 0.9 |
0.2 - 0.3 |
1.65 - 2.0 |
| EN24/817M40 |
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4: AISI 4340 steel mechanical properties
| Grade |
Tensile strength |
Yield strength |
Elongation |
Reduction |
Impact Value |
Hardness |
| AISI 4340 |
|
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|
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5: AISI 4340 steel overviews
| Size |
Round |
Dia 6-1200mm |
| Plate/Flat/Block |
Thickness
6mm-500mm |
Width
20mm-1000mm |
| Process |
EAF+LF+VD+Forged+Heat treatment(optional) |
| Heat treatment |
Normalized ; Annealed ; Quenched ; Tempered |
| Surface condition |
Black; Peeled; Polished; Machined; Grinded; Turned; Milled |
| Delivery condition |
Forged; Hot rolled; Cold drawn |
| Test |
Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. |
| Payment terms |
T/T;L/C;/Money gram/ Paypal |
| Trade terms |
FOB; CIF; C&F; etc.. |
| Delivery time |
30-45 days |
| Application |
AISI 4340 Engineering steels are used for Commercial and military aircraft, automotive systems, forged hydraulic and other machine tool applications, forged steel crankshafts. |
6: Delivery condition
For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.
For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.
For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.
Hunan Qilu Industrial Co., Ltd has the capacity to forge round steel, steel flat, square steel, module, shaft and roller, etc. The main specifications of the products include Φ80-1000mm forging materials and 80-1200mm square billets and which the maximum piece weight can reach 50T.
Hunan Qilu Industrial Co., Ltd were already engaged in exporting steel for 11 years, could supply a great variety of hot forged, hot rolled and cold drawn Steels, including engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel etc., besides Qilu Industrial also has their own heating treatment shop and machining shop to provide heating and cutting service.
Since 2008 year, Hunan Qilu Industrial has the right to export all FORGED STEEL behalf of Qilu Speical Steel Co.,ltd which is specialized in smelting and forging of special steel since 1965 year, now Qilu special steel is one of the biggest manufacturer of forged product in China.The forged products are used in Automotive, Aerospace, Power Generation, Oil & Gas, Transportation and Industrial. We already set up the warehouse in Wuxi and Dongguan city, more than 20000 tons ex-stock could be supplied with kinds of size.
Qilu Industrial is the professional one-stop steel manufacturer, stockist and exporter in China, our customers spread all over the world, include West Europe, North America, South America, Asia, Middle Asia, Africa, Australia, etc.
The company owns advanced special steel smelting facilities and forging processing equipments, the main steel-making equipment include 2 sets of 50t ultra-high power electric arc furnaces,2 sets of 60t LF refining furnaces,1 set of 60t vacuum degassing refining furnace and 4 sets of 1-20t electroslag re-melting furnaces.
The main forging equipments mainly include:3 sets of 5t electro-hydraulic hammers, 1 set of high-speed forging units of 800t,1600t,2000t and 4500t respectively.
Mier Lu
Hunan Qilu Industrial CO., LTD
Website: qilusteel.en.made-in-china.com
Tel: 86-731-85185769
Fax: 86-0731-85185771
Mobile/ : +86 1893241249
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